I drove an Attack Troop Carrier with two Grey Marine 671's in Vietnam. It was a converted WWII LCM where you had to handle 25 tons deftly using two D-handle four-foot joysticks. I would twist for power on each engine and shift forward or backward for differential thrust. You could pivot the beast very gracefully when needed. Like coming into a pier against a strong current. Many a night sleeping next to them while the night watch drove going up rivers and canals through the jungle. The 671 sound and smell is still hammered into my night memories. I remember dreaming about home then waking up to the nightmare - just the opposite of normal life.
Boats are such endless money pits as they age , been there done that but I still love them , great to see guys who really know their stuff , Awesome channel .
I was an engineer on tugboats in the late 80’s, we ran twin Detroit 16V71’s, we ran 24-7 year round, only down time was engine rebuilds in the shipyard. I use to change the oil and filters while we were underway, shut 1 down ,change fluids, start back up, then the other, the only downfall was the oil and filters were extremely 🥵 hot. Love these Detroit marine engines.
c: Methods we were in the company shipyard annually, for engine overhaul,and reduction gear maintenance, i worked the same boat for three years and never saw the engine blocks replaced. I’m now a Lineman supervisor in the communication industry, but working on the tugboats was by far the best job I’ve ever had!
@Methods Our 12V71s ran for 10, 12, and 14 thousand hours before we overhauled them. When I left, the 12k unit had 28k on the block, crank, rods,, cams and 16k on the parts that we replaced ( Heads, pistons, liners&shims, N70 injectors, gaskets&seals, blowers, and bearings ). Once the engine was back in service and I tuned it, the only things done were upgrades and oil changes. We went from the canister filters to spin on remotes and upgraded from a mechanical governor to an electronic one. The last was done so that we could operate them from a computer in the office instead of having to run them from the engine room floor for normal operations. In an emergency, we could run them still from the engine control panel. In a major emergency we could run them from the engine itself. Our engines when I left had been in service for 24 years. I had been there 18 of those years.
I am a retired bus operator from BC. I have a lot of GM time. Not only their engines but their buses too. The buses were all inter-city types. After 30 years driving scheds and charters I quit and started running tourboats and watertaxis close to home. I had fun watching you go through the procedures and commend your slow as she goes approach. Many guys will jump in and turn the key to see if she'll start. If it does, they walk away leaving the owner to uncover problems like loose prop nuts and fifteen gallons of water in the tank. IMHO, the tank or tanks should be properly drained cleaned and the fuel can be scrubbed or cleaned for use again. In any case as you said you caught it just in time. People including myself are amazed at the amount of water collected due to condensation in the tank collecting over many months or even years. I wouldn't say no to working on engine repair on boats. People are willing to pay good money for someone who is good at their profession. I'm sure at some point Pam will pass your name on to someone who needs a good mechanic.
As a boat lover and had my own marine engineering company, loved working on those boats. Great video thanks. Condensation from half full tanks would do that...Great memories 😆 Good video thanks.
This video brings back a lot of good memories. When I was in Sea Scouts (BSA) we had a single 6-71 Gray Marine (now called Detroit Diesel) in our 40ft launch. What a wonderful engine. I remember the 12v starter was rated at 9.6v @ 900A. Our 8D batteries never seemed to have a good charge so we would wire two in series and hit the starter with 24V. It always started right up. Some time we would put pennies under three rocker arms on exhaust valves for compression release, and start the 6-71 on three cylinders. Once running we would pull the pennies out with a pair of pliers with a short va-room as each penny came out. We then screwed the valve cover back on and were good to go for the day. It was great fun and a lot of learning for a 16 year old.
A Detroit 6-71 was a great engine in its time. You could say that about nearly every Detroit diesel from the ‘80’s and back. Had a 12-71 in a truck and a 4-53 in a car crusher and they were extremely durable and very low maintenance - prone to some oil leaks but that’s it.
So some other viewer noticed how he behaves. As a tech i always was pleased to be working. He has an attitude successful wrenches has. He never complains and conducts himself in a professional manner. I love seeing us represented that way!
Yes, absolutely. However, sometimes it is healthy to utter a few choice words ( as long as no one is near enough to hear them). It serves as a "mental reset" to alleviate stress, and allows you to return to the task at hand, with a fresh outlook. Honestly ... its something that only the life-long mechanic can truly understand.
When my dad was around and put his car in for a service he'd tell the proprietor: "I want to see gray headed people working on my vehicle!" I now understand what he meant. Nice job, well done sir!
I just found your channel and subscribed, I love watching a person with the knowledge and inclination and Tools figure out why something isn’t working and then fix it. I am trying to teach my kids and I want my triplets full sets of tools five years ago and they still have not open the boxes from Home Depot. Only a $60 tool set but it’s almost enough to take apart a car motor 132 pieces. This is what I grew up doing and my dad was a Ford mechanic never took auto shop in school and I was the lucky one and 77 they still had auto metal and wood shops in my high school and even in junior high there was metal and wood shops.You UA-camrs will be the new teachers of the younger generation so keep up the good work and explain what you’re doing as you work on whatever you are working on. Thank you sir for your help.
Retired now , but I've seen those old DD marine engine run with busted liners . A little smoky and wouldn't pull past 1600 , but it kept on running until shut down . New piston and liner kit , 1 new injector , a new head [just cause ] and back in service . Took 26 hours plus 6 hrs. to fly the parts out to us .
Great Video..Love the sound of Detroit Diesel's!! Being a Bus Mechanic 34 years I first cut my teeth on 8V71 Detroit Diesel's to 8V92 and 6V92 series with Turbos.. I miss rebuilding those engines! Now work on Detroit Diesel Series 60's and newer and Volvo D-13's..But I sure miss the days of injector picks and adjusting the governors on those engines..especially the sound of them in GMC or MCI buses!! Great video.. I need to find a boat with twin Detroit"s in it now since mine currently have Ford 427's in her! Lol.
There was a feature on locomotive EMD diesels (GM) two stroke that always saved the day. Each cylinder had a "flash cock" that was opened before cranking. Any water in the cylinder was blown out the flash cock before starting. After cranking several revolutions, the flash cock was closed and engine was started.
I've worked for a while at a marina in Fox lake Illinois there was a pretty big 80's houseboat that had twin 6 Detroits in it, the same problem with a water flooded tank and fuel system but... it made it to both engines then on land it stayed, the engines were pulled n the rest went to scrap. Both of those engines were fixed and are still paired together in a rescue tug for the breakdowns around the lake to this day. Great video 👍
I really appreciate the cautious, step by step approach in evidence here, and Scott's knowledge of this engine type that lies behind it ! I am learning a good deal about the 6-71 that I haven't gleaned from old manuals..very practical ! Always a chance I will end up with an old detroit 2 stroke powered boat .so glad to file this away, just in case !
The way that starter acted, I figured it hung up during Runaway & self destruction set in. Marine service engines have a difficult job, but that starboard engine sounded so good. I'd love to get that kind of power in a truck engine. Way Cool.
Good old 6-71s. When I was in the Navy I ran landing craft with twin 6-71s. We also had OMB's and they ran slant 6-71s. And we ran Box-Ls. The Sea Scouts in CA had a few. The Box-L's ran a 6-110 main and two 2-71 motor generator sets. All of them were good engines.
Great video, your sir have a great skill set, im a bus mechanic only wish we had a dozen of you working at my depot, thanks for update as well, hope the owner can get out and enjoy that old rig.
I used to live at a marina that had an old German WW2 era tug boat built in 1939 that would sink a couple times a year. The would get it up, and pull the water out of the fuel tank and oil reservoir, and it would start right up.
That boat is a classic !!! Good job getting her going !!! Might look a little drab now but she will shine up pretty with a little elbow grease and some research on UA-cam for some polishing ideas!!!!😊
Interesting video. I’m a bus guy (DD 8V92T) that just had the engine totally rebuild out of frame. I love the sound of a big 2 stroke. It always gets attention at RV parks, especially in the morning when people need to be awakened. 🤣
Worked in Offshore oilfield on a job one time for two weeks an we had a big crewboat that was glued to us the whole time, it had a pair of 16V-71's in it, we worked on one platform and worked on another building a 200' tall microwave tower.
Nice job, I'm a boat guy so great to see a boat. I found you from Stu at Danger marine. You have explained a lot to me I worked in the Viking Yachts boatyard in early 80's and this boat is I think an 'Ocean yachts' and was just down the road. Detroit's were the boat of choice back then ( building 150-200 boats a year!). We used I think 6-71's and 8-71? And 8-92 which I think are all V engines ? The engine boys talked about how they put oversize injectors and turbos on the engines too and some owners would remove these injectors and put even bigger injectors in which voided the warranty!..... these were sport fishing boats and they all wanted to run to the deep water as fast as possible to take the owner fishing ...... Only Viking Yachts are still in business building boats in NJ all the others got shut down by state or taxes. Viking are building up to almost 100' Long believe now with MTU. DIesels I think . Very interesting about the extra HP because they have so much better cooling..... hence why cooling and oil pressure is vital on boat engines as at that continuous hi load you can kill it in seconds if either is low! Great video Cheers Warren
I am starting the process of getting the fuel cleaned of dirt and water, changing the coolent, replacing the zincs, replacing the impellers, changing the oil, changing the fuel and oil filters, and just getting things adjusted. Once that is done I will do a video of firing up those engines at the dock. It will be a while before she is seaworthy enough to leave the slip and do some figure eights.
@@grandenauto3214 I am getting close to doing the start up of the starboard engine. It should be in a couple of weeks. I will let Scott know so he can let all know. You can also subscribe to my channel Buena Ventura Life.
Get 3 bottles of Howe’s fuel treatment add that to the tanks , the Howe’s will clean any water pockets in the fuel system . The old 2 stroke Detroit’s love that stuff and it cleans up the cylinders . After running it a little add a quart of Marvel mystery oil to every 100 gallons of fuel. When that engine was designed and built fuel had sulfur as a lubricant and marvel makes up for the loss of the sulfur in modern diesel fuel.
I love how people jump in after they haven't been watching for a while when they actually caught one of the videos and then say why are you reposting videos.. CUZ THE MAN IS BUSY..... Besides maybe you didn't get to see all of the individual videos... it takes time to put all of these single videos into one compilation that you can watch from start to finish the job it's kind of a nice thing.
One thing I love about Detroit diesels other than the sound is their versatility They’ve been used for marine purposes, road transportation, gensets, god knows what else
That is some serious power in that old twin screw, it will be a nice toy once the work is finished. Nice job on the injector, this will be a very awesome ICW cruiser.
I know boats aren't your thing but that was interesting...I would have liked to see (and heard) that boat get under way! That deep Detroit rumble is just plain cool! Thanx for the videos...you do a good job with them...very entertaining and quite educational to watch. ;)
I installed a Pair of 6-71s in a 10936 65 Foot British Power boats Motor Torpedo Boat back in '82 we rebuilt the Engines and fitted 5 Inch water Jacketed (not Water injected ) Copper exhausts....it sounded incredible but Ear defenders were essential if you were out on the Stern Deck..!!
I repair starter motors and love that sort of solenoid contact. Easy to clean up and get to. Some of the new lorry Bosch solenoids use a pyramid shaped contact that burns out after a few turns. They would not admit they made a mistake and carried on using it. Caused no end of warranty problems.
2-twin 671s (2 screws), in the 40 Boat series; Coast Guard, in service appx 1950s to about 80, some still in use restored and private service Love the 71 Series also were common in semis and construction equip, stationary power, etc.. Was a "Sea Tractor"
LOL, why isn't there soot on the back like bus? Saw a V6 53 run away, it was a blast! Sucked cardboard into and thru the supercharger in a split second. So option 2 was a 1 by board. So now it sucked the seals in adding oil only slowing the motor. So now it's spewing black smoke profusely and we're indoors. When Bob finally gave up many minutes later? You couldn't see your hand 2 feet from your face. Finally took the fuel filter off, killing it. The whole thing lasted at least 20 minutes. Oh and grabbing the rack, it locked open and didn't work. This old motor didn't have a flapper. When it happens you'll know why they call it runaway, because you'll be running!
The motor for my wrecker came from a 46 Ocean SS sport fishing version like you where working on here. It had a runaway and the flapper was frozen causing the boat to catch fire.
In WW2, 2 x 6/71 engines were installed in the M10 tank destroyer and the 4,000 Shermans built for the USSR under lend lease. Soviet commanders secretly thought the GM powered Sherman was better than the T-34.
These high output 6-71s were originally used in river patrol boats in Vietnam and through the various regional Detroit Diesel distributors were tuned up higher then the factory high output versions. I'm pretty sure these are Johnson & Towers out of southern New Jersey. The boat is an Ocean Yacht built in that area. The high output versions without turbos put out about 310 hp, The turbos were about 410 hp without a bypass. blower ,450 hp with a bypass blower and 485 hp with the larger injectors that he found on this boat. Other DD distributors were similar in Hp. Penske Engines claimed 500hp on their 6-71 TIB's. In the mid 1960's Richard Bertram had 36' offshore raceboats that had race prepped 6-71s that put out (?) 600 hp+ each at about 3000 rpm(?). They claimed they would run 40 hours at full throttle, much better than a gasoline race engine. GM also made aluminum 6-71 engine blocks. I don't know if the race boat used them or where else they were used. Maybe the bus mechanic knows about them. Also boat engines can overheat even with an ocean to cool them. On an old boat like this the 3 heat exchangers ( coolant, transmission and intercooler ) should be disassembled ,cleaned and pressure TESTED. Failure on these can put salt water where you dont want it. And the bronze raw water pumps have a bronze cam that squeezes the rubber impellers to displace water through the pump outlet. They don't necessarily look bad but can lose height from many hours and gritty sea water. One screw to remove when impeller is out of pump.
@@beeper388 thanks a bushel for the reply,that's still a lotta hp for such a small basket.I"ll givem one thing though the ones I drove were tough a nails.!!!
@@michaelbaumgardner2530 These high output engines were classified high speed light duty and were suitable for fast pleasure boats that might put on a few hundred hours a year if that. If run fast in a sport fishing boat and not serviced religiously they could be pretty tired in 2-3000 hrs. The other extreme was a 6-71 powered generator on Jacques Cousteaus' research ship, Calypseau that had about 30000 hrs on it when replaced and still running. Probably made 150 hp. Looked lika pile of rust and salt.
The number one reason of boat engine death is water circulation failure. A boat that’s been sitting for a long time may have several issues,. The impeller is old and stiff and should be replaced before the engine is even test cranked because pieces of it can end up throughout the engine. The other problem is marine growth may be blocking the water intakes. If water isn’t circulating, there isn’t even water able to touch the temperature sender to alert you to the fact it’s overheating and by the time the metal of the manifold where the sender is get hot it’s way too late.
I had an old liberty launch. It was a natural, no turbo. it was set up to only reach 2000 rpm. or less . It might have been 1800 .Reached hull speed at 1300. 7-8 knots. Held 12 gallons of oil. Easy to work on, great on fuel. Make sure to carry extra impellers and that oil and over heat alarms function. Easy to bleed fuel lines. I had 2 racoor fuel filters so if one clogged at sea I switched to the other. It also had a pto that powered a massive winch. Good dependable engine.
By the time we were ready to take our boat out on a trip, the only things left that were 1979 were the hull and the diesel engine. Everything else needed replacing or rebuilding and it looked pretty good compared to this one.
I watched your video and I'm not sure yet. Little tip. When you take the end cap off the solenoid loosen the main terminal contacts and push them down far enough to turn them a half turn and take the clip off the plunger disc a flip it over so you will have two brand new contacts for your starter power. A good trick to turn an old starter into a new one. Those two items and the brushes are mostly all that's done when they rebuild your starter. Other than cleaning it up repaint and change the end and armature bushing in the nose housing. One last thing chum and I don't mean to be a jerk but when hitting the sw to the power don't be afraid of it because when you get sparks you are losing a little piece of metal off your screwdriver or your contact point. Trust me on these tips for they are true. Good sounding 671's though and I think they will run for a good while to come. Good luck.
Had 12V 71s in a gunboat (ASPB) this brings back the smell memories of diesel exhaust in the morning....the only issue we has was keeping the batteries charged. But once started they ran without a hitch....thank god they started when we really needed them.
OK I know but it has a fantastic racy sound to it. Only thing I know about a PT boat is McKail's Navy and by the way I'm sure I spelled McKail wrong. Anyway I've always really liked the sound of those two-strokes.
PT boats used Gasoline engines V-12 powered by the same engines that powered the P-51 Mustang fighter. Only instead of one engine the PT boat had 3 engines.
The emergency doors being closed during a runaway, will often suck the end seals from the blower, causing that heavy black smoke as the engine begins to consume the lube oil. Mine built up so much pressure, that it blew the cap off the oil fill tube too.
They should have taken you out for a bit of deep sea fishing before you left. Then again, mis-attached propellers would have been a problem. Thanks for that update at the end. Greatly appreciated. I hope Pam has a large bank account. That is a particularly large hole in the water that will gobble up money at an evil rate.
I drove an Attack Troop Carrier with two Grey Marine 671's in Vietnam. It was a converted WWII LCM where you had to handle 25 tons deftly using two D-handle four-foot joysticks. I would twist for power on each engine and shift forward or backward for differential thrust. You could pivot the beast very gracefully when needed. Like coming into a pier against a strong current. Many a night sleeping next to them while the night watch drove going up rivers and canals through the jungle. The 671 sound and smell is still hammered into my night memories. I remember dreaming about home then waking up to the nightmare - just the opposite of normal life.
Thank you man I appreciate you !
I have got to say, I really enjoy watching you guys.
Boats are such endless money pits as they age , been there done that but I still love them , great to see guys who really know their stuff , Awesome channel .
I love that you make no complaints; you work with what is there and make it work. A great attitude!
I was an engineer on tugboats in the late 80’s, we ran twin Detroit 16V71’s, we ran 24-7 year round, only down time was engine rebuilds in the shipyard. I use to change the oil and filters while we were underway, shut 1 down ,change fluids, start back up, then the other, the only downfall was the oil and filters were extremely 🥵 hot. Love these Detroit marine engines.
c: Methods we were in the company shipyard annually, for engine overhaul,and reduction gear maintenance, i worked the same boat for three years and never saw the engine blocks replaced. I’m now a Lineman supervisor in the communication industry, but working on the tugboats was by far the best job I’ve ever had!
@Methods Our 12V71s ran for 10, 12, and 14 thousand hours before we overhauled them. When I left, the 12k unit had 28k on the block, crank, rods,, cams and 16k on the parts that we replaced ( Heads, pistons, liners&shims, N70 injectors, gaskets&seals, blowers, and bearings ). Once the engine was back in service and I tuned it, the only things done were upgrades and oil changes. We went from the canister filters to spin on remotes and upgraded from a mechanical governor to an electronic one. The last was done so that we could operate them from a computer in the office instead of having to run them from the engine room floor for normal operations. In an emergency, we could run them still from the engine control panel. In a major emergency we could run them from the engine itself. Our engines when I left had been in service for 24 years. I had been there 18 of those years.
very hot is why we used nitrous oxide
I am a retired bus operator from BC. I have a lot of GM time. Not only their engines but their buses too. The buses were all inter-city types. After 30 years driving scheds and charters I quit and started running tourboats and watertaxis close to home. I had fun watching you go through the procedures and commend your slow as she goes approach. Many guys will jump in and turn the key to see if she'll start. If it does, they walk away leaving the owner to uncover problems like loose prop nuts and fifteen gallons of water in the tank. IMHO, the tank or tanks should be properly drained cleaned and the fuel can be scrubbed or cleaned for use again. In any case as you said you caught it just in time. People including myself are amazed at the amount of water collected due to condensation in the tank collecting over many months or even years. I wouldn't say no to working on engine repair on boats. People are willing to pay good money for someone who is good at their profession. I'm sure at some point Pam will pass your name on to someone who needs a good mechanic.
As a boat lover and had my own marine engineering company, loved working on those boats. Great video thanks. Condensation from half full tanks would do that...Great memories 😆 Good video thanks.
This video brings back a lot of good memories. When I was in Sea Scouts (BSA) we had a single 6-71 Gray Marine (now called Detroit Diesel) in our 40ft launch. What a wonderful engine. I remember the 12v starter was rated at 9.6v @ 900A. Our 8D batteries never seemed to have a good charge so we would wire two in series and hit the starter with 24V. It always started right up. Some time we would put pennies under three rocker arms on exhaust valves for compression release, and start the 6-71 on three cylinders. Once running we would pull the pennies out with a pair of pliers with a short va-room as each penny came out. We then screwed the valve cover back on and were good to go for the day. It was great fun and a lot of learning for a 16 year old.
I always used a spring starter.
My boat had 6-71N mains, and a 2-53 genset. Never missed a beat. Great engines.
I have been watching these videos for a while, and I will say, this man is not just a mechanic, he is a Doctor.
A Detroit 6-71 was a great engine in its time. You could say that about nearly every Detroit diesel from the ‘80’s and back. Had a 12-71 in a truck and a 4-53 in a car crusher and they were extremely durable and very low maintenance - prone to some oil leaks but that’s it.
So some other viewer noticed how he behaves. As a tech i always was pleased to be working. He has an attitude successful wrenches has. He never complains and conducts himself in a professional manner. I love seeing us represented that way!
Instablaster.
Yes, absolutely.
However, sometimes it is healthy to utter a few choice words ( as long as no one is near enough to hear them).
It serves as a "mental reset" to alleviate stress, and allows you to return to the task at hand, with a fresh outlook.
Honestly ... its something that only the life-long mechanic can truly understand.
When my dad was around and put his car in for a service he'd tell the proprietor: "I want to see gray headed people working on my vehicle!" I now understand what he meant. Nice job, well done sir!
I just found your channel and subscribed, I love watching a person with the knowledge and inclination and Tools figure out why something isn’t working and then fix it. I am trying to teach my kids and I want my triplets full sets of tools five years ago and they still have not open the boxes from Home Depot. Only a $60 tool set but it’s almost enough to take apart a car motor 132 pieces. This is what I grew up doing and my dad was a Ford mechanic never took auto shop in school and I was the lucky one and 77 they still had auto metal and wood shops in my high school and even in junior high there was metal and wood shops.You UA-camrs will be the new teachers of the younger generation so keep up the good work and explain what you’re doing as you work on whatever you are working on. Thank you sir for your help.
You are very thorough! You saved rhe customer from many more headaches....
What a great sound to hear both engines perring. Thanks for taking us along 100 points
Retired now , but I've seen those old DD marine engine run with busted liners . A little smoky and wouldn't pull past 1600 , but it kept on running until shut down . New piston and liner kit , 1 new injector , a new head [just cause ] and back in service . Took 26 hours plus 6 hrs. to fly the parts out to us .
Great Video..Love the sound of Detroit Diesel's!! Being a Bus Mechanic 34 years I first cut my teeth on 8V71 Detroit Diesel's to 8V92 and 6V92 series with Turbos.. I miss rebuilding those engines! Now work on Detroit Diesel Series 60's and newer and Volvo D-13's..But I sure miss the days of injector picks and adjusting the governors on those engines..especially the sound of them in GMC or MCI buses!! Great video.. I need to find a boat with twin Detroit"s in it now since mine currently have Ford 427's in her! Lol.
There was a feature on locomotive EMD diesels (GM) two stroke that always saved the day. Each cylinder had a "flash cock" that was opened before cranking. Any water in the cylinder was blown out the flash cock before starting. After cranking several revolutions, the flash cock was closed and engine was started.
Trouble shooting skills like yours are hard to find. Thanks for posting this.
I've worked for a while at a marina in Fox lake Illinois there was a pretty big 80's houseboat that had twin 6 Detroits in it, the same problem with a water flooded tank and fuel system but... it made it to both engines then on land it stayed, the engines were pulled n the rest went to scrap. Both of those engines were fixed and are still paired together in a rescue tug for the breakdowns around the lake to this day. Great video 👍
Wow Fox Lake is about 3 feet deep ;) , I'm surprised that thing wasn't permanently run aground
I really appreciate the cautious, step by step approach in evidence here, and Scott's knowledge of this engine type that lies behind it ! I am learning a good deal about the 6-71 that I haven't gleaned from old manuals..very practical ! Always a chance I will end up with an old detroit 2 stroke powered boat .so glad to file this away, just in case !
The way that starter acted, I figured it hung up during Runaway & self destruction set in. Marine service engines have a difficult job, but that starboard engine sounded so good. I'd love to get that kind of power in a truck engine. Way Cool.
That boat hasn't had much love in a long time.
11
Good old 6-71s. When I was in the Navy I ran landing craft with twin 6-71s. We also had OMB's and they ran slant 6-71s. And we ran Box-Ls. The Sea Scouts in CA had a few. The Box-L's ran a 6-110 main and two 2-71 motor generator sets. All of them were good engines.
Great video, your sir have a great skill set, im a bus mechanic only wish we had a dozen of you working at my depot, thanks for update as well, hope the owner can get out and enjoy that old rig.
I used to live at a marina that had an old German WW2 era tug boat built in 1939 that would sink a couple times a year. The would get it up, and pull the water out of the fuel tank and oil reservoir, and it would start right up.
Thanks for your time. I really enjoy seeing you working on these engines. Never thought that you did boats too.
Watching these videos I've learned a ton about things I'm guaranteed never to use. I'm hoping what I now know will make me fun at parties.
Such a beautiful sound, 2 stroke Detroit Diesels give me goose bumps!!
Yeah i l i ke them
They smell like victory, LOL!
My god I feel exactly the same way.
Wow.. okay, I am sold. You guys know what you're doing and I will be watching you videos. Very awesome thank you.
That boat is a classic !!! Good job getting her going !!! Might look a little drab now but she will shine up pretty with a little elbow grease and some research on UA-cam for some polishing ideas!!!!😊
That exhaust though! I’ve never heard a throatier 6-71. I can’t wait to hear this thing roar.
One of the highlights of my wrench turning days was rebuilding twin 671's for an oil rig mud pump. One was left hand rotation the was right hand.
Sounds like two Siamese 6-71s connected to a common gearbox like they had in the tanks in WW2.
Better than anything currently on The History Channel!
Interesting video. I’m a bus guy (DD 8V92T) that just had the engine totally rebuild out of frame. I love the sound of a big 2 stroke. It always gets attention at RV parks, especially in the morning when people need to be awakened. 🤣
very funny
This boat is my favorite because this diesel sounds evil
Sound of the v71 12 and 16 cylinders is also amazing
My uncle had a 68 Peterbilt with a 12V71. Yeah they sound awesome He also owns a 16v192 gen set.that v192 is a monster!!
Worked in Offshore oilfield on a job one time for two weeks an we had a big crewboat that was glued to us the whole time, it had a pair of 16V-71's in it, we worked on one platform and worked on another building a 200' tall microwave tower.
Nice job, I'm a boat guy so great to see a boat. I found you from Stu at Danger marine. You have explained a lot to me I worked in the Viking Yachts boatyard in early 80's and this boat is I think an 'Ocean yachts' and was just down the road. Detroit's were the boat of choice back then ( building 150-200 boats a year!). We used I think 6-71's and 8-71? And 8-92 which I think are all V engines ? The engine boys talked about how they put oversize injectors and turbos on the engines too and some owners would remove these injectors and put even bigger injectors in which voided the warranty!..... these were sport fishing boats and they all wanted to run to the deep water as fast as possible to take the owner fishing ......
Only Viking Yachts are still in business building boats in NJ all the others got shut down by state or taxes. Viking are building up to almost 100' Long believe now with MTU. DIesels I think .
Very interesting about the extra HP because they have so much better cooling..... hence why cooling and oil pressure is vital on boat engines as at that continuous hi load you can kill it in seconds if either is low!
Great video
Cheers Warren
I like boats too
Have her send a video of the boat under way , preferably full throttle !!! ( LOVE the sound of that thing ) .
I am starting the process of getting the fuel cleaned of dirt and water, changing the coolent, replacing the zincs, replacing the impellers, changing the oil, changing the fuel and oil filters, and just getting things adjusted. Once that is done I will do a video of firing up those engines at the dock. It will be a while before she is seaworthy enough to leave the slip and do some figure eights.
@@Bill23799 Buena Ventura Life is the UA-cam channel. Coming up will be a powering up the starboard engine. That should be a good time.
@@Bill23799 ua-cam.com/channels/4cDzl6wSlfh2n7Zgv13m-g.html
Not a diesel guy but the sound of the 2 stoke..... sweet
@@grandenauto3214 I am getting close to doing the start up of the starboard engine. It should be in a couple of weeks. I will let Scott know so he can let all know. You can also subscribe to my channel Buena Ventura Life.
Marine diesels sound so good!
You are a damn good Detroit mechanic, I enjoy watching your stuff.
Get 3 bottles of Howe’s fuel treatment add that to the tanks , the Howe’s will clean any water pockets in the fuel system . The old 2 stroke Detroit’s love that stuff and it cleans up the cylinders . After running it a little add a quart of Marvel mystery oil to every 100 gallons of fuel. When that engine was designed and built fuel had sulfur as a lubricant and marvel makes up for the loss of the sulfur in modern diesel fuel.
I love how people jump in after they haven't been watching for a while when they actually caught one of the videos and then say why are you reposting videos..
CUZ THE MAN IS BUSY.....
Besides maybe you didn't get to see all of the individual videos...
it takes time to put all of these single videos into one compilation that you can watch from start to finish the job it's kind of a nice thing.
Thank you.
He's got me wanting a 4104.
Just subbed. Love to see when a person REALLY knows their business!!!!! Lovin' this video!
One thing I love about Detroit diesels other than the sound is their versatility
They’ve been used for marine purposes, road transportation, gensets, god knows what else
A lot of the 4-53s and 4-71s found their way into industrial and agricultural equipment.
That is some serious power in that old twin screw, it will be a nice toy once the work is finished. Nice job on the injector, this will be a very awesome ICW cruiser.
LOL
You are the detroit diesel guru!☝️👍👏
I know boats aren't your thing but that was interesting...I would have liked to see (and heard) that boat get under way! That deep Detroit rumble is just plain cool! Thanx for the videos...you do a good job with them...very entertaining and quite educational to watch. ;)
Great job, love the 671 sound
dude the life you have made for yourself is a dream congrats
Thank you, it’s not easy but I love it
A fuel water separator is a must for a diesel engine. Keep up the good work
I installed a Pair of 6-71s in a 10936 65 Foot British Power boats Motor Torpedo Boat back in '82
we rebuilt the Engines and fitted 5 Inch water Jacketed (not Water injected ) Copper exhausts....it sounded incredible but Ear defenders were essential if you were out on the Stern Deck..!!
I appreciate the full length, long format videos. Thank you.
Your thoroughness and knowledge are awesome.
there's nothing better than a Detroit diesel engine sound :-)
I repair starter motors and love that sort of solenoid contact. Easy to clean up and get to. Some of the new lorry Bosch solenoids use a pyramid shaped contact that burns out after a few turns. They would not admit they made a mistake and carried on using it. Caused no end of warranty problems.
2-twin 671s (2 screws), in the 40 Boat series; Coast Guard, in service appx 1950s to about 80, some still in use restored and private service Love the 71 Series also were common in semis and construction equip, stationary power, etc.. Was a "Sea Tractor"
LOL, why isn't there soot on the back like bus? Saw a V6 53 run away, it was a blast! Sucked cardboard into and thru the supercharger in a split second. So option 2 was a 1 by board. So now it sucked the seals in adding oil only slowing the motor. So now it's spewing black smoke profusely and we're indoors. When Bob finally gave up many minutes later? You couldn't see your hand 2 feet from your face. Finally took the fuel filter off, killing it. The whole thing lasted at least 20 minutes.
Oh and grabbing the rack, it locked open and didn't work. This old motor didn't have a flapper. When it happens you'll know why they call it runaway, because you'll be running!
Looking at getting a boat with these motors. Thanks for your insight and fault clearing procedures.
The motor for my wrecker came from a 46 Ocean SS sport fishing version like you where working on here. It had a runaway and the flapper was frozen causing the boat to catch fire.
I wonder how long it ran before it gave out?
Michael H well it’s still going to runaway even if you cut off if oil is dumping into the intake
@@BenjaminEsposti one took 1hour 47 minutes as per uscg
You have rain is just about every video that i have watched of yours.
I love that pirate themed yacht. That's pretty badass.
Just curious, do you suppose all of that rigging was real?
Shoutout from TAT Express out of Hutchins, TX
Engines don't run away Mechanics run away Engines over speed! Old school guy.
Very nice to see this video on the boat
Say man thanks for the update dude that's where I know the two strokes from is the boat world peace and blessings
I wish Pam would get a channel on UA-cam so we could follow her & the boat.Enjoy your videos, just getting started watching them
In WW2, 2 x 6/71 engines were installed in the M10 tank destroyer and the 4,000 Shermans built for the USSR under lend lease. Soviet commanders secretly thought the GM powered Sherman was better than the T-34.
Thank you for sharing all your knowledge
I've ran these in trucks and turned up,but 450hp...wow unbelievable.!!!
These high output 6-71s were originally used in river patrol boats in Vietnam and through the various regional Detroit Diesel distributors were tuned up higher then the factory high output versions. I'm pretty sure these are Johnson & Towers out of southern New Jersey. The boat is an Ocean Yacht built in
that area. The high output versions without turbos put out about 310 hp,
The turbos were about 410 hp without a bypass. blower ,450 hp with a bypass
blower and 485 hp with the larger injectors that he found on this boat. Other DD
distributors were similar in Hp. Penske Engines claimed 500hp on their 6-71
TIB's. In the mid 1960's Richard Bertram had 36' offshore raceboats that had race prepped 6-71s that put out (?) 600 hp+ each at about 3000 rpm(?).
They claimed they would run 40 hours at full throttle, much better than a gasoline race engine. GM also made aluminum 6-71 engine blocks. I don't know if the race boat used them or where else they were used. Maybe the bus mechanic knows about them.
Also boat engines can overheat even with an ocean to cool them.
On an old boat like this the 3 heat exchangers ( coolant, transmission and intercooler ) should be disassembled ,cleaned and pressure TESTED. Failure
on these can put salt water where you dont want it. And the bronze raw water
pumps have a bronze cam that squeezes the rubber impellers to displace water through the pump outlet. They don't necessarily look bad but can lose height from many hours and gritty sea water. One screw to remove when impeller is
out of pump.
@@beeper388 thanks a bushel for the reply,that's still a lotta hp for such a small basket.I"ll givem one thing though the ones I drove were tough a nails.!!!
@@michaelbaumgardner2530
These high output engines were classified high speed light duty and were suitable for fast pleasure boats that might put on a few hundred hours a year if that.
If run fast in a sport fishing boat and not serviced religiously they could be pretty tired in 2-3000 hrs. The other extreme was a 6-71 powered generator on Jacques Cousteaus' research ship, Calypseau that had about 30000 hrs on it when replaced and still running. Probably made 150 hp.
Looked lika pile of rust and salt.
That would be a cool boat to fix up. Looks like a good wash and roll some paint on there it would look pretty good .
Your skills are first class, boat has potential.
Even if i cant swim id be proud to own a boat with detroit diesels pushing it
not if you were paying the fuel bills
@@jmyers9853 not right now anyways
Great job on the engines very informative great vid thanks!
That was hilarious when you showed how far away your bus was.
The number one reason of boat engine death is water circulation failure. A boat that’s been sitting for a long time may have several issues,. The impeller is old and stiff and should be replaced before the engine is even test cranked because pieces of it can end up throughout the engine. The other problem is marine growth may be blocking the water intakes. If water isn’t circulating, there isn’t even water able to touch the temperature sender to alert you to the fact it’s overheating and by the time the metal of the manifold where the sender is get hot it’s way too late.
I had an old liberty launch. It was a natural, no turbo. it was set up to only reach 2000 rpm. or less . It might have been 1800 .Reached hull speed at 1300. 7-8 knots. Held 12 gallons of oil. Easy to work on, great on fuel. Make sure to carry extra impellers and that oil and over heat alarms function. Easy to bleed fuel lines. I had 2 racoor fuel filters so if one clogged at sea I switched to the other. It also had a pto that powered a massive winch. Good dependable engine.
Didn't think it was possible to get 400+ hp from a 671 regardless of the cooling, amazing.
By the time we were ready to take our boat out on a trip, the only things left that were 1979 were the hull and the diesel engine. Everything else needed replacing or rebuilding and it looked pretty good compared to this one.
Awesome videos. I have the same engine in my barge, This will be very helpful.
I had a Volkswagen beatle that had two 671s. It was a little back heavy and always pulled to the right.
I watched your video and I'm not sure yet. Little tip. When you take the end cap off the solenoid loosen the main terminal contacts and push them down far enough to turn them a half turn and take the clip off the plunger disc a flip it over so you will have two brand new contacts for your starter power. A good trick to turn an old starter into a new one. Those two items and the brushes are mostly all that's done when they rebuild your starter. Other than cleaning it up repaint and change the end and armature bushing in the nose housing. One last thing chum and I don't mean to be a jerk but when hitting the sw to the power don't be afraid of it because when you get sparks you are losing a little piece of metal off your screwdriver or your contact point. Trust me on these tips for they are true. Good sounding 671's though and I think they will run for a good while to come. Good luck.
Had 12V 71s in a gunboat (ASPB) this brings back the smell memories of diesel exhaust in the morning....the only issue we has was keeping the batteries charged. But once started they ran without a hitch....thank god they started when we really needed them.
I would love to have that. Sounds like a PT boat.
it doesn't sound anything like a PT Boat, VERY different engines
OK I know but it has a fantastic racy sound to it. Only thing I know about a PT boat is McKail's Navy and by the way I'm sure I spelled McKail wrong. Anyway I've always really liked the sound of those two-strokes.
PT boats used Gasoline engines V-12 powered by the same engines that powered the P-51 Mustang fighter. Only instead of one engine the PT boat had 3 engines.
That boat sounds amazing.
I really enjoy your videos. Thank you for sharing your knowledge and passion.
I feel your pain man I've been working on boats for over 20 years. I live in the damn bilge-
The emergency doors being closed during a runaway, will often suck the end seals from the blower, causing that heavy black smoke as the engine begins to consume the lube oil. Mine built up so much pressure, that it blew the cap off the oil fill tube too.
16:58 sounds like a joyous symphony of WOW!!
They should have taken you out for a bit of deep sea fishing before you left. Then again, mis-attached propellers would have been a problem. Thanks for that update at the end. Greatly appreciated. I hope Pam has a large bank account. That is a particularly large hole in the water that will gobble up money at an evil rate.
Detroit's, Pure Music...
Loving these long format videos. Well and all your videos. Keep em coming!
Nice to have the videos on this boat all put together bro. All the best from NZ
Have to paint those puppies Alpine Green!!! Make em look as good as they sound!!
I sure do love your videos man , I wish I had your talent .
awesome story... I love the addition of new stuff (boats) not being the same ol' Shit is nice, Thanks Brother
a great attitude to make compliants!
You are a great Mechanic how many guys worked on this thing and missed the water in the fuel. That had to be the initial problem from the start
Those engines sound SO sweet.