Why Do Diesels Leak So Much? Why Do Diesel Engines Leak So Much Oil?
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- Опубліковано 15 вер 2024
- If you have a Diesel Engine or have worked on them, odds are it has a little oil leak or weep somewhere. This seems to be normal on these engines, but why is that? This video describes the main reason for it and what can be done about it.
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It's like the old Detroit diesel saying if there are no oil leaks it's out of oil
Diesel’s don’t leak they just mark their territory.
Guy M. Balo LMAO !!!!
Sweatin horsepower!
😂
u should see how they mark their territory here at the cat plant😂
Hahaha like a lion
As many engines as I have rebuilt through the years, this never occurred to me! This guy is a true mechanic/ engineer in a world of a bunch of parts changers. Great diagnostic and analytic skills
What about a D399CAT turbocharged V16 leaks everywhere.
Hi, I think you are very good at explaining thinks especially to truckers that are not their own mechanics. I had a 1999 Pete with 3406E and had 1,1800,000 when I sold it. I was lucky with very seldom having breakdowns, I always caught things during services and was able to repair thinks on the road and never needed a tow. One time I was losing coolant and it wasn't leaking. I was looking under the radiator and noticed very little puffs coming out of the radiators little rubber over flow hose, they were so slight that the only way you could even tell, was by my face being an inch away from the hose. I used 4 gallons of coolant to make it back 400 miles to my shop. I checked it out further and decided it must be the head gasket. I pulled the head checked all the cylinder liners and had the head pressor tested and decked. I put it back together and had the same problem, woops, took it apart again and had my 35-year-old son with better eye then mine check the cylinder liners again and there it was no. 1 cylinder liner had a micro crack in it. Needless to say, I will have my son do the looking from now on. Just wanted to share that with you, thanks.
I had a very similar headache that resulted in multiple tear downs. Had a coolant leak, was burning coolant, exhaust smelled terrible. Machined the head, new gasket, problem persisted. Turned out to be a slipped cylinder sleeve due to a single overheat. Had to swap out the block to fix it. Super pain in the ass! 😆
When it is no longer leaking, it is out of oil/fluid
i call it "rust prevention"
Free undercoating
Brilliant. 50 years ago I got an excellent Caterpillar apprenticeship and ended up running an engine shop. Your explanation was excellent. It was erudite and simple, the best kind of tutorial. Bravo!
Adept ape, big fan of your channel, greetings from alberta Canada.
Since today's topic is PCV I thought that I'd share another method that we use. Bit of background. I work for one if the large railways here in canada as a locomotive mechanic. Our engines are upwards of 11,000 cubic inch, 4500 hp, giants that move a lot of air and a lot of boost (up to 70 PSI on the new units)
To keep our crankcase from suffering an over pressure (which actually trips the engine shut down on our engines) we use what's called an eductor tube system. An eductor tube is a tube that goes into the exhaust stack of our engine. A hose comes from the crackcase, through an oil strainer, and to the eductor tube. The eductor tube is a venture tube that uses the venture effect of the passing exhaust gases to form a vacuum that draws blow by gases out. It is very effective. I did a load test (essentially an extended dyno pull on the engine using the generator) on a unit. At full throttle, the system was able to hold the crankcase pressure at -3psi.
I know this would be impossible today with how oil poisons the DOC, DPF and SCR filters but it shows another method that overlooked on road.
Looking forward to the next video. Cheers!
speed150mph m
Well said, I've told many people that systems like that are THE ANSWER to oil leaks.
Short story - Back when I was working on performance cars for a living I had a customer bring his car(68 Firebird) in(on a tow truck) with a quarter size hole in the oil pan and a little story. He was out driving, knocked the underside of the car on something but all appeared fine so he kept going. When he got home he shut it off, got out and soon noticed that all his engine oil was on his driveway. He got to looking under the car and found the hole. Baffled he told me this story asking why it didn't leak till he shut it off. The answer is that he had a system much like you describe I'd installed on his car. It sucked so much air that while he was driving it pulled enough air to prevent the oil from escaping out the large hole.
FWIW the system was PCV plus exhaust vent and the engine was supercharged, I'm sure these things helped. The PCV was tapped in between carb and supercharger and Tee'd in with the exhaust with one way valves. So whichever was higher PCV vacuum or eductor vacuum pulled crankcase gasses. This combined with a lack of vent pulled a significant vacuum in the crankcase.
Speed150
Speed150 I’m from cold lake Alberta looking to release from the military and get into heavy mechanics. I’m currently a mechanic on turbine engines for the cf18. Any advice on getting into the trade. Thanks in advance.
Josh Head given your background you’d be a sure bet for an aircraft mechanic.
But there are lots of openings into the heavy equipment trade, especially in your area with the oil industry. Your military background doesn’t hurt as well. I’d just look around and see who’s hiring and who is interested in taking you on as an apprentice. Should be no problem
Yes, girls leak a lot too, but I still love em
onlylikenerd
Lol
onlylikenerd
Gross.
Girls aren’t desiels😒
Take a joke poeple
zeckmon3 zeckee I’m sorry but I’m not one of those people ok.
Huh, I always just figured it was because they vibrate more than a gasoline engine. I never thought about it this way. Thanks!
Bucketsamson There are tons of little reasons too. More total hours of run time, more gaskets, larger sealed surfaces, and older gasket designs a lot of the times.
Many, many more miles on the engines = more heat and cool cycles (expansion/contraction).
Something magical about the smell of burning diesel engine oil fumes.
Much higher compression ratios than gas engines too... causing more blow-by...
This is a great series of videos. I've been working on engines all my life but I'm always interested in learning new things. Thanks!
It took me a while to grasp the concept of crankcase breathers and why you get more oil in the air inlet and turbo during idle rather than load thanks for your videos. I work on MTU marine engines; they use a crankcase breather filter system that leads right to the air inlet horns.
Nice explanation. I have worked on industrial equipment that has oil under pressure up to 6000 pounds and no leaks. The simple truth the gaskets are not as good as can be. If you can keep the compression in the cylinder the for sure the oil can be kept in the engine. The diesel engine is a big polluter. I have worked on large marine diesels and many don't leak a drop.
The DD60 in my truck doesn't leak, and neither do any of the other trucks in our fleet... because we maintain them. One of the fastest ways to get put out of service at a DOT inspection is to be bleeding oil.
Plus, the last thing you'd want to do is blow oil laden crankcase air onto the intake side of a turbo. If something fails its a sure fire way to feed a turbo lots of lovely engine oil. Run away anyone?
Cant run away on fumes...
I know. Read what I wrote. If something fails in the circuit or maybe the oil level gets over filled, you have a direct route straight into the Turbo. Not the best idea unless it's your only choice.
The amount of fumes is is minuscule . Manufacturers have been running crank case vents into the turbo inlet on diesels for a while 40 plus years to present . Ive never heard of one running away from this.
Again..... "If something fails its a sure fire way to feed a turbo lots of lovely engine oil."
Capt Vimes But what your also forgetting which can be a high mileage failure is the turbo is fed oil too and that can blow seals on its compressor side and feed the engines inlet with oil.
Hi Josh, I really enjoy your channel content. My 17 years old Powerstroke has never piddled on the driveway. I hope watching this video doesn't jinx it.
Many of those leaking diesel engines probably have several times the hours/mileage of a typical gas engine. I've seen CAT diesels with over a million miles and marine diesels with 10s of thousands of hours. I started driving in the 1960s. Before the PCV and other smog systems. Then I could by a 327 with 375 hp or more. Only recently has the hp come back to gas engines. The late 60s, 70s, and 80s were nightmare years for smog devices and gas engines if someone needed real power. That's why diesel pickups became popular despite their price. I owned a series of Chevy v-8 engines from the late 60s to the late 80s. Each new truck had less hp than the one before. My last 350, 1986, had about 140 hp. Then I went to diesel.
Capt. Ron: "Diesels love their oil".
"Why is that"?
Capt. Ron: "Nobody knows"........
Oh yes we do!
“A diesel loves its oil like a sailor loves his rum”
scdevon no tiene porque di esta bien construido. El trabajo es duro, pero la construcción debe ser lo también. Guías de válvula mas que segmento rascador
Only the ones made in the US of A
A diesle's leak is like a squall, they come on ya fast and they leave ya fast. Or was that a lot lizard?
Admit up front that I'm not even close to being a diesel mechanic or technician but did appreciate that you dumbed it down some so that I understood it. I have a 2003 Motorhome Diesel Pusher with a CAT7 engine in it. Had one oil leak last year that was fixed by changing the oil cooler and just came back from a trip where we noticed oil leaking again. First long trip and was obviously concerned that we had another oil leak. Going to have a diesel mechanic give it a look just to make sure we don't have something stupid going on but was interested to know that diesel engines like the CAT7 would probably leak or seep now matter what. I read a lot of the previous responses from other folks and at least felt I learned a little bit about what might be going on. Thanks to all of you.
Best customer to have is one that can't stand oil leaks on their equipment 😁. Great video Josh, great information and well-spoken.
As a used heavy truck dealer I see hundreds of engines per year. The Cats have way more leaks than Detroit or Cummins but they also command the highest resale value
Maybe. I had a Cat 3406 and it didn't leak a drop of oil till it dropped a valve coming down a long hill with the jake on. After a complete rebuild at a certified Cat engine dealer, it did nothing but leak after that. If everything is torqued properly with good gaskets, I believe that is a huge cause for the leaks, not just the blowby. In my case I believe the mechanics that worked on my engine didn't do what they should have done.
Best diesel explanation channel on UA-cam u deserve way more then 30k subscribers
This needs to re-titled Why Do American Diesels Leak So Much (there's a world beyond the USA borders with not only better diesel engines but a lot of them are oil tight).
Cheers mate! 🙏🏻 I have 300 Tdi engine (by International) on my LR Defender and your video perfectly describes the situation 👍
Blaming the leaks on turbos is fairly misleading, especially since half of them actually don't have trubos at all and still leak a lot. It has more to do with an overall increase in operating pressures and vibration which is much higher than that of gas engines. Higher build quality does abate this though so more expensive = less leaky
Glad you did this video. I’ve been trying to fix every leak with another springing out not long after lol.
Enjoyed the video. My 2010 BMW 335D has it's PCV valve piped to the Turbo inlet. I found this while replacing the valve cover gasket. Car has 120K on it & runs like a dream.
I absolutely love diesels!!!
Love your channel & have subscribed.
Will be watching more of your vids.
Thanks!!!
I like the way you explain things in general. I learn quite a lot from you. Thank you.
Pretty much all smaller diesel engines run the PCV into the intake side of the turbo. Never seen an issue with it. The crankcase filters are horrible. I've seen Cummins 6.7s completely fail because the filter was clogged up. On the ISX, they "redesigned" the filter to basically be an empty shell because the filters never worked anyway.
diesel engines dont lack vacuum because of turbos, they lack because no throttle plate to restrict
Wrong, and if you want to say otherwise I have a nice N/A diesel you can shove your mouth on and tell me it has no vaccum.
Matt Lane
They use vacuum to fill the cylinders, but they don't have manifold vacuum like a petrol engine. Yes, the intake will suck air, but that doesn't mean there is manifold vacuum. Literally just Google 'Diesel Manifold Vacuum' and you'll come across hundreds of pages explaining why they don't produce vacuum like a petrol engine does. Hint: The reason is, there isn't a throttle plate in diesel engines because the amount of air entering the engine doesn't have to be regulated like in a petrol engine.
Saab Story
The only intake manifold vacuum you’ll have is air filter restriction.
On a turboed one its between the filter and compressor wheel, both cases it’s minimal.
To build pressure or vacuum you must have displacement and a restriction. The engine provides the displacement, a throttle valve (or your mouth, what ever floats your boat), provides the restriction. No restriction, no vacuum; that's just how it works.
@Matt Lane hook up a vacuum gauge to the intake manifold of that N/A diesel and tell me if that needle even twitches.
Just because the engine's pulling air into itself without any assists doesn't mean it has vacuum. A gasoline engine has zero appreciable vacuum at full throttle for the same reason your N/A diesel never has vacuum: There's nothing in the intake tract to restrict airflow in the first place.
Hmmm, my 1c-tl Toyota has the pcv before the turbo, I personally don’t like it since it just coats the whole intake with a bunch of oil. And the moment you said pcv it made sense why diesels leak, great video!
Thanks for your dedication, you help us understand and resolve a lot of problems.
we should pay you for this.
My 7.3 Powerstroke has an unrestricted ccv into the turbo intake as probably every Powerstroke does. Mine had only 50,000 miles on it and there was a small build up of gunk in the intake. None to the turbo yet. So I put in a well designed catch can. I placed the catch can down low at the bottom of the engine next to the oil filter and ran 3/4 inch PCV hose to it and back to the intake. The total hose was about four feet. This gives the vapors time to cool, condense and turn to liquid. The liquid gunk then stays in the catch can by gravity. All engines should be like this because they don't want gunk.
good video idea: Why do two-stroke diesels sound good?
My wife’s Ford SMax 2l tdci has covered 210,000 miles. I checked the oil level once, I think in around 2011, it was ok. It’s never leaked a drop. I have had European diesels (Audi, Ford, BMW, Volvo) for the last 2 decades, and I just get them serviced and never bother to check the oil, basically because they never need checking
I've thought about using the exhaust gas flow in my open (no muffler) system with the puke tube hooked to it thereby causing a vacuum on the motor. We do this with drag cars with great results actually picking up hp.
Few things wrong, it doesn't matter if a gas engine has a turbo or not. There is always vacuum on the manifold side at low loads with a check valve and the there is always a secondary port on the turbo inlet side.
Also turbos don't blow up from having oil vapor going though the compressor side. The most that would happen is impeller tip damage and I have never seen that. The only time I've seen compressor tip damage is from pre turbo water injection where atomization is horrible along with the volume being injected.
Few things wrong, no one cares if you have any vacuum at some point, you can not suck out the crank with a turbo because of... as said NO VACUUM...
+Matt Lane Nice try. Learn how to read next time. I was talking about turbo gas engines. Also there is a vacuum under full load at the turbo inlet in both gas and diesel engines.
+Matthew B. Another person... Again taking about gas engines and they almost always have two separate pcv systems. One to the manifold with a check valve( known as the pcv valve ) and one in the intake system( pre throttle or turbo if equipped). The main system works on vacuum and the secondary works on scavenging under high load..........
Matthew B. Same here for a little over 10years. It's the same system just two different parts of it. Didn't mean they were separate. Also you never mentioned anything about diesel in your comment. I work on high performance gasoline engines and have data on vacuum being pulled with pressure transducers. While it's not a lot, it is still vacuum none the less. Syphon sprayers work on the same exact principal of creating a low pressure area in the tubing which creates a vacuum to pull liquid up.
Matthew B. You must me one of those so called "engineer types" and thinks everything works on computer models. Go test it for yourself if you don't believe me. I have nothing to prove. It is the internet after all.
Get a map sensor. Any map sensor. Find the specs on it and the voltage out put levels based on KpA on the high and low side. You will easily be able to interpolate the scale in/hg-to-psi if you don't have a proper logger and hook it up to the in take side post turbo. Better yet since you are a mechanic. Install said sensor and connect it to an oscilloscope and take the car for a cruise varying load so you can see the graph of trending data.
Now the question is will you even try doing it to prove me wrong? Either way I'm done with this stupid internet squabble. People can believe whatever they want to believe.
All piston engines create high air pressure and turbulence inside their blocks. The pistons create this as they move up and down on each stroke. Before 1969, engines vented the excess pressure out a tube that vented downward onto the ground. The PCV_(positive crankcase ventilation) vented the pressure up into the air cleaner where the oil laden air was burned inside the combustion chamber. Most didn't notice, but motorcyclists really noticed the oily slick that was always in the middle of roads especially at intersections. Thanks to the EPA, we no longer have this slick surface to worry about, and engines no longer use a quart of motor oil every 500 miles.
They still use it. It just gets burnt
Big fan from Toronto Canada. About to write my truck technician license. I enjoy your channel. Keep it up,ill send ppl to your channel.
+neoarmour Thanks for sending people here. Thanks for watching.
A few thoughts for ya. I work on boats with car engines, mostly big block Chev but make does not matter. Most boat motors do not have a PVC system, motorcycles don't either. Even motors with superchargers don't have them and they push more gasses past the rings than normal aspirated ...and they do not normally leak. Pcv systems are just a metered vacuum leak, they only pull in high vacuum situations...ie idle and light throttle cruise situations and the actual volume is minimal. Boat and motorcycle engines use a simple breather system. The idea is to slow down the speed of the escaping gasses...if you have a 1/4 inch hole in a valve cover to vent the engine or a 1 in hole, which hole will allow the gasses to slow down the most? Once you slow the gasses down you let them flow through a not restrictive filter medium. What seems to work best is a material that looks like old time brillo pad, not the kind that looks like steel wool, the kind that looks like wadded up strips of copper. It has enough surface area to catch the oiley vapors and hold it until it collects into droplets that end up dripping back into the motor. No reason that should not work on a diesel, my 24 valve cummins has 200k an has a simple road draft tube and the only leak it has is from the steering box...you ever VB use UV dye to diagnose oil leaks? I use them on car motors that look like they are leaking everywhere and after some dye and a black light I figure out that it's just old valve cover gaskets...
CDR Crankcase Depression Regulator.
My 1986 M1009 has one on it's naturally aspirated 6.2 diesel engine.
By the way; the first PCV valves were put in 1950's Willys jeeps.
The reason was the old road draft tubes admitted water during river fording.
The pcv system allowed the block to be sealed up except for a breather on the top of the valve cover.
This guy talks so slow. Speed 1.25x makes him sound normal.
Thank you ...
Lol true
2 X is even better
Ikr was about to post the same thing
If the English language is not your original language you will be able to understand what he saying better than normal talking
As a retired farmer I;m qualified to comment IMO. The main cause is simply many mfg-ers don't bother to use quality gaskets. Japanese all DO.
I shouldn't say this for fear of breaking the spell, but my mighty 2009 6.7L Cummins diesel with 176,000 miles of carefully maintained service is dry as a bone, top to bottom...The same can be said for the Aisin commercial six-speed auto behind it...Neither one has ever been opened nor abused in any way, just worked...
Thank you sir, your "informal" courses are helping change my C grades to A in my "formal" courses.
Just add more bolts to the pan ,valve cover and other places .Semi hermetic compressors have more bolts so the pressure of the Freon dosn`t leak oil or the gas out . I never seen these leaking oil at the gaskets
great video changing your oil regular intervals goes a long way.
Awesome video bro. I work on firetrucks you did a heck of a job explaining this! Keep it up.
From what i have learned in school its due to sulphur being in fuel, therefore the egr transfers the corrosive sulphur burn off into the oil and the corrosive oil will deteriorate the seals.
I never noticed there was all that much of a difference. Gas engines seem to leak and seep just as much as the diesels I specialize in. The system Chevy used on its 6.2 and 6.5 was called a CDR. My old one still works good despite over 400,000 miles on it and a good share of those were on a turbocharged engine. The turbo still works fine and shows no ill effects either.
thanks to this video. before i was always bother why my diesel engine is so messy .i thought there were defective parts on my diesel engine. now i know that this is a normal thing
Paccar Engines uses CCV Valve that is electric... same concept as the Detroit but this one is electric... good video
Confirmed: I own a diesel mercedes 240d car from 1974 that has no turbos and no oil leaks and the crankcase is connected to the intake with a tube. Diesel cars are cool. Gasoline is too mainstream bro.
I suppose it depends on the engine design and how much pressure the turbo makes.
I am very familiar with the 6.9/7.3 IDI diesel engines that Ford used in pickup trucks from 83-94. In these engines(originally designed to be N/A), they used a PCV system(called a CDR instead) and sucked it into the intake. When turbochargers were added(aftermarket kits were/are available for many years, and Ford even offered one on 93-94) they simply dumped the crankcase gasses into the inlet of the turbo.
Surprisingly(or not), the turbochargers don't seem to have any problems with failures. They run a long time as it is... but they are only pushing 10 PSI of boost.
In this engine case, they absolutely had to burn the blowby... this engine was designed with massive ring gaps, and makes enough blowby to look like the engine is on fire if it is just vented to the atmosphere.
Despite this, both N/A and turbo(sucking crankcase gasses at slight vacuum from the air filter restriction)... they still leak oil quite commonly. From all manner of places.
MacRobb Simpson I just recent purchased a 86 f250 6.9 idi for $1250 cad.
Unfortunately the valve cover leaks like a sieve.
How long would it take to replace valve cover gaskets?
Or how much would it cost at a shop roughly?
One trying to run this engine on vegetable oil!
Thanks for your time.
Doug
Not that this would pass emissions or inspections.
But if you had PCV, valves on the crank case, and lines ran to an 3 way oil catch canister, with an little pcv external air filter on top, and a small pump under neath the canister to feed the oil back into the engine to reduce oils waste. This completely relieves anything having to enter the turbo, and it's all connected to the crank case.
I'm looking to buy a diesel truck so even pickup trucks leak? New trucks? This was informative, anything that helps me have an informed decision before buying.
i thought it was because they generally live longer lives then gasoline engines. my assigned truck has 700K miles on it with a cat C15 acert. i do not know if its ever been overhauled BUT gasoline engines do not live that long. the longer something lasts, the more leaks it generally develops UNLESS it has had a full rebuild with all new gaskets.
They also rattle like hell and are under higher stresses but... having pressure also don't help.
Even non-turbo Diesel engines don't produce vacuum. There is generally no throttle plate, so there is no significant negative pressure in the intake tract.
There is no throttle plate in any diesel engine, at least not associated with running and fuel regulation. Many have one that closes when the engine is switched off. Prevents rough stops and in the unlikely event of runaway switching off the engine starves it of air immediately.
Nice simple explanation. Its what makes your videos stand out.
+Jim Zivny Thank you sir
the difference is the THROTTLE not the turbo. the throttle creates the vacuum in a gas motor.
I drove a Pete with a 318 for a year. It took 2 gallons of oil every morning to top it off. The undercarriage got steam cleaned once a week and bolts tightened but it was pretty useless.
My 06 Duramax doesn't leak. Have over 260k miles on it. Still runs like a brand new engine. My Allison Transmission looks like it was never even used. I took it off the truck, took it apart and looked inside. Literally ZERO wear inside.
Diesel engines don't use PCV but CCV system, and yes it goes before the turbo and after the air filter, it's just a valve with a spring that closes at full load by the vacuum created by the turbo
Diesels run higher oil pressures and diesel engine oil has significant amounts more detergent and cleansing additives that can wear gaskets over time.
paccar, detroit and volvo all use oil powered centrifuge filter. and its purpose is not to pull fumes out of crankcase only to filter oil out of fumes exiting crankcase without causing a restriction to said fumes
I think this has more to do with the way diesels are designed than to do with the turbocharging. If it was boost that caused oil leaks, every single petrol engine with a turbo or supercharger would also spew oil from the seals. I have a near 200,000 mile, 17 year old turbocharged petrol car that makes a little over 20psi and it definitely doesn't leak. It has more to do with the fact diesels don't create manifold vacuum since there isn't a butterfly valve in the throttle body, that's all. The boost pressure absolutely doesn't help the fact, but it's mainly to do with the lack of manifold vacuum even without a turbo.
1. No throttle plate to provide a restriction therefore no manifold vacuum. Can be negated with a vacuum pump.
2. Higher compression ratios = more blowby = higher crankcase pressure. Same reason the diesels dirty their oil with carbon so fast.
3. Because of the lack of a throttle plate (generally) a diesel's cylinders are always getting a above atm air charge due to the turbo and compressing it. Meaning there is always blow by every compression to exhaust stroke. While a gasoline engine that is 'engine braking' has its cylinders unable to pull in a air charge due to the closed throttle plate and the cylinder will have lower pressure then the crankcase during intake to power stroke and 'reverse' the blow by path for gasses.
Summarized a diesel engine's PCV system in whatever form it takes is having to deal with a lot more flow constantly then a gasoline engine's PCV system which has to have a valve to prevent over scavenging at high manifold vacuum (idling).
Turbocharged gas motors have PCV. Non turbo diesels don't have PCV. The real reason diesels don't have PCV is because diesels don't have a throttle body and therefore have no manifold vacuum to take advantage of.
The super dependable 7.3 in Fords has the CCV suction line in front of the turbo and they don't have turbos blowing up prematurely so I don't see that as a problem.
yup, all our cummins fleet engines post 2008ish leak relatively profusely and all of them have crankcase breather filters.
I was going to say the exact same thing. Using the inlet of a turbo to pull out the crank case gasket. Thank you for including the detailed infermation. On why it s not used. Vs just that the system is not used. I still do not understand why the pressurized intake runners are not usef. To pull out the crankcase gasses. In a paint gun the pressurized air is used to creat an airstream. Which creats the vacuum Which pulls up the medium to heavy paint medium. Would not the pressurized air. Which creats a powerfull airstream In the intake runner. Be used to creat the needed vacuum? Question no.2 why use hydraulics to power the vacuum pump. Since the gasses are light and you only have a small amount of engine oil mixed in with them. A electric motor should do just fine. Run quieter nd use less engine power. Since the drain off the alternator would be minor. Compared to the power needed to turn a hydaulic pump. Then there is the simplicity of the electrical system. Vs the number of items needed to run a hydraulic system properly. And there you have complexity which creats headaches. Which dictactes cost.
crankcase disposal fumes unit!Im putting that one on the wall.That was great.Good video my friend!
+scott brazinsky Thank you.
Your welcome.
They don’t really,the old diesel transit I’ve just got rid of didn’t spill a drop, depends on the age of the motor, after a certain age, maintainence seems to drop off and once you’ve had you’ve had a messy incident she’ll drip whenever she gets a bit warm !
We had 1996-2005 International AmTran Rear Engine busses with the T444E engines. That consumed oil like crazy. Our oil checker guy called them Oil burners. The T444E in our conventional busses were fine but those RE’s just drank it like crazy. So I’m sure they leaked oil somewhere as to why they always needed oil added.
Yup, as they wear they produce more blow by. At some point it can overcome the breather system. Course this depends on the diesel.
Have a takeuchi track loader at work, first year they put a tier 4 kubota in they put a filter on the crankcase breather. In the winter it tended to freeze up and the crankcase pressure would end up ejecting the dipstick.
In my experience fuel type has no effect on oil leakage, pcv matters only as long engine is running
I stopped using gaskets and use only gasket maker when clearances allow. Stuff is awesome in a caulking tube. No leaks
My 2002 Ford Fiesta 1.4TDCi has a breather that goes to the turbo inlet. I always needed to clean the turbo and all the intake conduits.
Recently I added a oil catch can, I hope this will stop the turbo from eating oil.
My cummins has an aftermarket drain welded into the exhaust pipe.
Does it work well? Been thinking about putting that on my 12v
Very informative as usual! I have 1995 3208 turbos in a boat, crank case breather is routed to air filter, would you suggest pointing them somewhere else and just collect the oil from the tube? Thanks again!
The current setup is fine, Chris, as it allows a venturi effect to withdraw the crankcase vapors into the air cleaner. The drawback would be less air cleaner longevity.
Thanks for this video .
I took advantage of this information about leakage.
Thanks a lot
Volvo also uses the centrifugal oil separator, no real issues the gaskets due harden due to heat cycles and leak but other than that the only real sources of leaks on a D13 are the rear of the rocker cover (clearly due to dissimilar materials of block and rear gearcase cover.) And the injector thru harness
You can absolutely have a PCV on a turbo charged/ supercharged engine gas or diesel. Now, my guess is since emissions regulations are lax on big diesels and they aren't subjected to the same emissions standards as car manufacturers is that they simply had a crank case breather vent instead of a full PCV setup. Didn't know diesels tended to be "weepy" either. I've seen plenty of weepy petrol engines, but then again I tend to work on things built before 1990 and from sweeden or Germany haha.
Interesting thought. Why not vent the crank case fumes
Into the fuel tank. And simply increase fuel tank vent volume. Use a dip tube to vent fumes below diesel fuel level. Using the fuel oil AS the filter.
Just wondering. I'm not really familiar with diesels. Just a thought.
Brandon Allen great idea. I think I'll go take out a patent tomorrow
Seems an honest suggestion so here’s an honest response:
The warm gasses coming out of the engine vent would pick up diesel fuel fumes, so this would smell terrible, far worse than simply venting the crankcase directly.
The point of routing the pcv into the intake is to capture and burn the blow-by fumes, rather than simply venting them to atmosphere. Pulling a slight vacuum in the crank case and reducing leaks is a bonus.
Blow-by has incomplete combustion products, so perking them through the fuel will muddy it. Badly. This will in turn clog your (expensive) fuel filter and/or cause wear to your (very expensive) injector pump.
My 2004 Sprinter engine (OM647 from the DaimlerChrysler era, but all Mercedes) uses an oil separator to remove oil fumes from the blowby and the cleaned gasses are sucked into the turbo inlet. 183,000 miles on mine, over 700,000 on a buddy’s.
Both engines still run tight and dry.
Josh, the Cummins comments you made were not entirely correct. Cummins used this on the 1st common rail engines and some of the IFSM Fuel Systems, the PCV System. They used a similar crankcase breather filter as they do now but, instead of venting the filtered blow by gasses to the atmosphere. They then routed the (Downdraft or blow by tube) to the suction side of the turbo. They did this after the intake air filter but, before the turbo inlet. This successfully functioned for years and even now when those engines come in our shop they still run great even with hundreds of thousands and even 1 million miles or more. The only fault in this idea was the operator and/or the customer.
Just as morons do with not changing their oil as the manufacturer says. People do the same thing with air filters, fluids, oils and in this case, crankcase breather filters. The worst is when they let their engine air filter AND the crankcase breather filter both go WAY TOO far between filter changes. This caused one of either high blow by, oil injection through the CAC then into the intake and I’ve even seen runaways caused by a stupid crankcase breather.
Diesels also have no throttle plate, so there is no vacuum even without a turbo. Thus, it can't draw a vacuum in the crankcase. Also, 2-stroke diesels use superchargers to pump air into the cylinders through the crankcase. They leak even more!
It is also a reason of the cheap manufacturing process used for the engine. There is way to prevent almost all oil leak by adding a lip to redirect the oil away from the seal. For example, if the oil 'rain down' then it will obiviously wet the joint where the gasket is. But if you add a lip that is part of the top part and extend downward then oil just can not get to the gasket, thru it can't get out. There is also other ways to do it that is even better, but they all add cost and manufacturing process. Since they are not required by law to do much about it then there is no reason to actually do anything about the issue.
If you look at any window on your house, you will see that they do not use gasket to keep the water outside, but a series of fold/bend/lip to catch and redirect the water. They could do the same.
Well done, 99.9% of people even IDK 98% of mechanics underestimate the importance of crankcase breathing.
Have not seen one yet but I’ve heard the new L5P Duramax has an electrical Centrifuge to remove the oil before they put crankcase fumes into the turbo inlet
Excellent video Josh with great explanations! There is quite a bit of misinformation and misunderstanding exhibited in the comments below on this subject.
+Chad Jessup Thank you Chad. There are obviously several reasons for oil leaks, but this was focused on the PVC system. I stated that at the beginning of the video, but people seem to miss that. Thanks for watching.
Good to know where all that leaking oil is coming from! Thanks, man
....i have two 3208 cat turbos, 375hp engines, 14 years old, on my boat, and i never had a drop of oil under the engines or on the engines, ...sometimes a few drops of cooling water , but never a drop of oil....
They don't, necessarily. My 32 year old Mercedes turbo-diesel: Bone dry. They don't leak if you engineer them not to leak. Similarly: My old 1999 New Beetle diesel with 300,000+ miles (a friend still owns it): NO LEAKS.
Thanks for helping out Jpaydirt.
you jpaydirt?
Thank great discussion. Mine still leaks, happily, but it leaks.
Mine has 175k and so far no leaks. Very happy about that.
5.9 cummins isb 300k plus not a drop of oil anywhere. The "right stuff" by permatex is the key.
I disagree at my shop I rarely see turbos every damaged from oil residue. The amount of oil that touches the impeller is so minuscule with the pcv routed to the turbo inlet. I personally think its the best system. Rings benefit from the vacuum. Many manufacturers still use this system present day.
The use of an exhaust crankcase evacuation system may help (Google it). Hook into exhaust after the turbo connected to crankcase evacuation tube. Install a breather on the valve cover to provide filtered fresh air.
Thank you very much for making that video! I have a series 60 and I was just about to type my blow by tube into the intake piping of my truck so I would not have to smell the blow by and it sounds like I would have wiped out my Turbo so I'm glad I had not got around to doing it yet before watching this video thank you very much
michael garner have done to mine been driven two hors per day for last year no probs yet but will be adding a catch can.
Omg....thank u very much...those filters are super bypass filters actually..and you removed my doubt why super bypass filters are there...