Diesel Blow-By Field Testing on EIGHT Trucks!
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- Опубліковано 8 лют 2025
- In this episode, we put 8 different vehicles to the test as we measure blow-by back to back! With the help of J-TEC specialized tool, we tested the pressure flow in each engine and dived deep into understanding the results. Then, we come up with a solution to correct the pressure offset using a crankcase filter.
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Awesome! Probably the first person on UA-cam to do real world testing on a Cummins 6.7 before and after a CCV filter change. Bravo!
I was wonder how many miles on the one changed out or was this a new truck? how about weight between old and new.. you hear a lot of folks on youtube talk about how heavy they are when changing them out.. great video with lots of good info.
Yes but changing that filter did not restore power or reduce blow by like he said. It only allowed a little more to flow into the intake. I'm really surprised he don't know that.
When Dave blew into the meter, he was way over the limits of DWI (Dieseling While Influencing). Dave you Rock Brother‼️
😂👍
Best reply award goes to... VERYMADMIKE!!! 😆
@@DavesAutoCenterCentervilletruck frames aren't straight. They don't stay straight, and many don't come straight from the factory. They handle like garbage. They need diagonal "spokes", just like a bicycle, except on the truck frame. Forming an "x". One inch bolt, near the rear cross members, should be fine. Build a mounting plate or backing plate, or hanger for it, and thread it through...... Then tune it just like you tune a bicycle wheel. You're welcome. I will call your shop to confirm on Tuesday. October 22. When you make a video about it, just say Sasquatch told you about it.
Also, unibody vehicleS can have similar "x" installed and formed into the design of the floor, with bolts that can be tensioned to straighten out the frames....... They aren't perfect from the factory, and don't stay perfect. When you're on ice, the car MUST be straight.
This should have happened 140 years ago with the invention of cars. It would be the first "safety" feature of a car. For some reason they are obscenely expensive, and they aren't even tuned for alignment and handling. It's obscene. Adjustable rear subframes don't counT, because at high speed, on ice, they weathercock - from different air drag across the warped body.
We are so glad you enjoyed using our VH563 Series Blow-By Flow Meter with Handheld Display! There is so much to learn from blow-by and we're happy to help! Thanks for the shout-out!
You should consider a average function - high and low that might take a little of the guess work out of a reading - but is a cool tool information is power
YEA OKAY WE ARE NOT BLOWN AWAY
What are the units of the display ?
@@tc3sean Actual Cubic Feet per Minute. Range is 014 - 80
The good old 6.4 powerstroke. Ticking time bomb.
I saw it and said I know what this thing is about to do! And it was even worse than expected. That good ole 6.4 never lets you down from being much worse than expected
You know an engine is bad when some shops won’t even work on them. I had one for a while and chose to let it sit and rot into the ground after it wouldn’t fire after shutting it off one day. I run 2 pre emissions NPR’s for my landscape company and couldn’t be happier. Looking for a nice LBZ but haven’t found the right one yet.
@@ohtwo23so you shut it off and it would turn back on? If it was running good before you shut it off it would have been a simple fix
@@carter.coleman i just kept having issues with it and finally said the hell with it and bought an NPR. There were codes showing an injector bank down and another showing PCM. i was done
@@ohtwo23 what trim is it? If it’s not a base model I’d consider buying it for the right price
"We've decided we're not going to let that one warm up" 😂 Great video!
I really like the positiv enegery Dave has when he's talking about his job. Greetings from Germany!
Interesting test
I've owned many diesels over the years. My current 17 Ram 3500 has had blowby since new. Called out dealer when new and kept getting
" no issues, runs fine"
What was your symptom?
Thank you, Dave. I learn something new every time I watch your channel. I am a novice when it comes to cars. My trade is hvac/r. Your channel is one of three I look forward to watching daily. Thank your son for starting this channel.
That is awesome!
My career as an engineer continually taught me proof is always in the data. Collecting data then quantifying it to identify trends, making comparisons, and supporting arguments with statistical evidence is CONFIRMATION . . . . DONCHA LUVIT!
Yep, that's what us scientists do 😊
Diagnostics are just as important whether you client is a truck or a person. The more data you have the better you know what if anything is wrong. Great Videos Thank You 🙏
This was the best education ever!
Taking time to keep learning is key!
I learn something every day.
Education that's spot on is so important.
Most people even if they learned new things deside on hiring a pro like yourself.
Go Mr. Utah Dave!
Thank you for your great filming content!
Telling it like it is so important.
If it's broken, it's broken.
Fixing things cost a lot of money.
Take care of it, and it will treat you for a lifetime of many miles!
I feel like my 7.3 leaker would blow the competition away 💨
Got a 12v Cummins that’d give u a run for your money
I had a 99 f550 4dr 6spd. Started blowby and I sold it😂 only had 150,000 mi
Blow by the competition lol
Such an underrated comment
Ya they do that your alright ;)
Well Dave, your new blowby toy tells us that the rings have failed, this is very vital info, as ANY missfire will cause oil contamination by fuel and carbon particles, with only a few thou clearance on journals etc, it becomes obvious why engines sieze or run their bearings. You and Lake Speed are highlighting the real seriousness of oils, but also the point that lots of factors also play into this situation.
That's a pretty cool test. I would like to see some scientific analysis to see if these numbers can come down. Maybe different oil or even rings
“Maysure” 😂😂 always cracks me up lol
thought the same thing
“Traysure” - Fred from Scooby Doo
I have worked in the engine testing world for 20+ years and JTec flow meters have been used for blow by measurements in many applications. Super simple reliable product with excellent support if ever needed. Ziptie that meter under the hood and run the cable in the ca, check it out on a drive.
New Engine suck nowadays
@ceasarperez8567 mmmmm idk about that one, yes on the smaller stuff but a majority of the truck engines are by far superior. Especially gasoline, the diesel engines themselves are superior. But...and this is a big but, the epa added trash chokes them.
This is one of those videos that many of us will come back to watch more than once in the coming weeks, months and years.
A way we test blowby in tier4 emissions equipped engines is by disconnecting and blocking off the ccv system and installing the blowby gauge inline. This gives a more precise reading of blowby and a better indication of ring/cylinder wear if your looking to gauge it. I love the oil cap technique though. The reason those later model engines blowby went down may have been due to the ccv system opening up more and pulling that through
Just tried Daves way to on my 2005 Ford. No issues. Learning so much.
This is gold! Also on 6.7 power strokes and LB7 duramax engines, a poorly seated injector can cause excessive blow by.
Awesome videos!!! I am not a mechanic but have learned a few things by watching your videos!!!!
That Gorilla Ladder is a Godsend. A must-have for working on trucks or anything else
Great tool!
If the cap's a dancin' it's no good.
The scenery in the background is amazing !
I would love to see the readings on a truck with a CCV that has been ran to the exhust pipe with venturi.
Exactly.
Breathalyzer for your engine.😂 My Grandfather used to homebuild mercury filled manometers back in the 60's to diagnose blow buy. He was a mad scientist for his time.
Gohdamn 2015 with close to 400K … and still runs good 👏🏾 bravo to that owner
should go talk to the camper pullers before i quit in 21 i knew several with old dodges with over 1 million miles i parked 2 after 600k the 6.7 was running so good they couldnt diagnose why the fuel mileage was dropping. I had enough to do one of the 2 things that needed done but since it was still running so good they said ya have to change both the pump and injectors. changing one would kill the other and probably take out the engine.
@@Thultarnhave you ever figured out why your mileage was dropping? that’s currently what I have. 2011 ram 6.7 cab and chassis with 412k miles. Engine runs good, no blowby but mpg ain’t the greatest.
@@JeffreyBezosi mine went from empty 23 mpg to 14, loaded 10 to 6 i was pullin campers so weight not to bad heavy average 23,500. Guy who bought it was still driving it when i last heard a year ago but was starting to sputter heavy excelorating. I think it was both injectors and the cp3 pump getting weak. I used Hot Shot Secrets additives to fuel and oil.
First truck “thats a shit ton”🤣🤣
The phenomenal test procedure and results were impressive and informative. Thanks so much.
Hey Dave, y'all basically did a FEV1 test in the beginning of the video. FEV1 stands for Forced expired volume in 1 second. It's a great test to assess lung function in COPD and other obstructive vs. restrictive lung diseases.
Well just in time for small airway disease? Not much in the way of Obstruction. lol
Yup, do one of them every 3 months during check ups
Hello Dave: This pressure transducer with the digital readout does a great job 👏 👍. TMP from N.J.
The Kodiak tow truck is sweet. Nice that is a 2008 in regards to emissions as well.
You and Gale Banks would be a hell of a combo
Guess I’m not the only one to think this.
Thanks for everything Dave! On those trucks with excessive blowby I would be curious to see the flowmeter before and after an oil change!
Great video! I tore down and rebuilt my first 6.7 Cummins this week. I’m going to watch your stuff all the time now.🎉
Hey Dave. Appreciate the info...Also one thing to consider on the used car inspection, at least in our area, dealers dont wanna fix or take money off for things that are wrong with vehicle....
Yes, that can be true. At least you as the buyer would know what you are in for as far as probable repairs 👍
the 6.7 powerstroke is a good demonstration of how low tension keystone rings work. When the dynamic compression increases the blowby decreases.
Wtf is dynamic compression
@SmokyBoi also known as relative, its the engines compression number under load, temp and rpm. Boost and all that come into play, the more compression the engine generates (and more power it outputs) the tighter the rings are because they physically wedge into the cylinder wall with higher loads. 6.7s have very little blow by under load because of this design.
My 6.4l is still good at 180k . I checked it years ago when i bought it. Was a military truck.
Yah, military truck that is not regenerating. Problems are almost non existent on 6.4's. without emissions.
BOUGHT MINE FROM ORIGINAL OWNER 19,000 MILES DELETED IT COMPLETLY
The 6.4 😂
I laughed so hard. Of course the 6.4 is bad 🤣
6.4 just doing 6.4 things. Cracked pistons 😂
Those 6.4 were made like that from the factory lol 😆
I saw it and said here we go!
This is amazing testing, bravo
Thank you! Cheers!
These tests reveal Dodge Cummings are indestructible
Great video, Dave. I'm planning on buying my first diesel in 2 years and enjoyed the education. Need more of these
You don't need that fancy machine when the oil cap is doing a dance ..lol
I love watching this guy. Really enjoy the details. Also, really enjoy how he sounds just like a Rick and Morty character. I think it’s the cadence of his sentences it just makes me think that every time.
Thank you so much for all the great information! Just bought a 7.3 powerstroke and used your test and has zero blow by. 239k miles. I hope to get a million miles out of her
Testing blow by in inches of water with a manometer is standard practice in the heavy equipment/trucking industries. It’s always amazed me you guys never checked it with a measuring tool until now. Also looking at numbers is fun but it would be better if you specified in the video what units your measuring them in (Yes I noticed the gauge said CFM) & also what the permissible value or repair limit is for each engine. I believe a Cummins 6.7 (industrial application) is roughly 7 in/h20 with the proper orfice tube installed for testing.
I knew the 6.4 Powerstroke would take a commanding lead lol
Thank you Dave. I learn more about engines with every video. God bless you, and everyone around you.
Glad you're having fun with your new toy, Dave!
I am!
@DavesAutoCenterCenterville
👍😂
1:10 bro has asthma
I had a '12 Ram 3500 for about 6 years. When I bought it with 589k (for cheeeap, deal of a lifetime) it had zero apparent blow by. I didn't have a flow meter but you couldn't feel any at all and it wouldn't flap a sheet of paper either. When I sold it at 640k, it still had none. I changed the crankcase vent filter to make sure that wasn't skewing that... What a sweet truck, it ran like new and looked new except the cruise ctrl buttons.
As far as I know, according to the maintenance records, the engine hadn't been rebuilt or replaced...
I've got a 2015 Cummins with 233k and the oil cap stays put. No blow-by
I had an old gas-powered van with a 302 . It had so much blowby that I installed a vent with a filter to catch the oil. I drove it until the timing set failed. Back then, you could buy a remanufactured engine for about $500. That's what I did. Drove it for a few more years. Everything else was extremely worn out by then . I expect that someone got a really good engine cheap.
Blow-by was always a parameter that we measured at Cummins Illinois/Cummins Northern Illinois as part of the dyno test. As I recall, It's been about 25 years or so, 3" H2O (might have been mercury) was the no go spec.
3" of mercury would be vacuum though, but blow-by should be measuring positive pressures. I wonder what's up
@@sethnowak9823 column height can be used to measure both pressure and vacuum.
The medium used (mercury or water) doesn't define one or the other, they just give a different scale.
The difference is which end of the fluid column the sensing line is connected to.
The meter in the video is measuring Actual Cubic Feet per Minute which is volume. Completely different to pressure.
@JonoSann very good point! Thanks for the good explanation. I've never seen inches of mercury used for pressure
Awesome work Dave. All the best to you and your family. As a former ASE Master Mech... you gotta be tough to be in this industry.
I’m not even going to watch this Video, cause the Title says everything about these Quick Lube Oil Shops!
Again, not one is held responsible for the Product they Sell.
Doing the same thing over and over is the Definition of Insanity!!!
Keep up the excellent work Dave!!!
Id love to see a blow-by test with and without different CCV catch cans
Do a test then.
Thanks for all your knowledge
So glad to see this! Now I know how I can check on my 7.3 with 39K miles on the engine currently.
Excellent video ! Thank you for sharing this is so useful
Great Data collection!👍🏻🇺🇲
I like the filter under the rocker cover that stops the oil from getting dirty.
Holy crap this channel grew quickly!
Back in 2003 my Cat dealer rebuilt one of my trucks under warranty and no telling how many others because their machine was wrong…. It was a Cat tool and pressure based, flow testing makes much more sense
do a test on one of your new builds and compare
These are days of Roses for this shop. Monster repair invoices create yuge cash flo to keep well oiled shop humming.
I have a rare V6 Powerstroke that had a clogged crank case breather. I did the same thing with a hose in the oil fill cap to let the pressure out until I figured out that a breather from a 6.0 Powerstroke would fit.
Very nice information. Tyson is one he'll of an employee .
Love watching you guys! Keep up the great work
Started as a breathalyzer 😂
😂😂😂
My truck has watched me do the blow test time for it to do it 😂
I like the custom rubber glove measuring tool .😂
Had a fleet of 3116 cats in gm topkick chassis. All used from Ryder. When Ryder decided to not do maintenance on some by the time we got them they were sometimes 10x over spec. Always checked on a meter on a dyno. Maintenance and luck are good things. If you don't do the maintenance, you will have 0 luck. Sample size was 150 units.
“Oh man, ok, that’s a shit ton”
Me every time something leaks or breaks on my 97 Cummins 😂😂
That's an awesome little gadget I've been looking to buy a Duramax but so many of them in my price range they have 260,000 to 300 and some thousand miles on them love them guys say no blow by but I'd hate to end up buying one and have problems because they're so expensive 2 rebuild blossom video buddy keep them coming
We have one at work with the Allison transmission, and I can't recall it ever needing anything at all with those miles. The only thing is 5k mile oil changes, and a battery replacement all its life.
Well for one, “duramax” could mean a complete pile of shit, or pretty decent. Know your different models and the issues with each year, not just the fact that it’s a duramax. It’s the same for powerstrokes or even Cummins.
It could blow the oil cap clean through the hood and sellers would tell you it had no blowby, then get mad at you if you call them out. Needle in a haystack to find anyone with scruples.
When you stop learning your dead. (Henry Ford)
I like to see you be methododical. That will give you the best information.
The “oh that’s a shit ton” made me subscribe 😂
I'd be interested to see what it is on one of your brand new engines.
Same, they should have tested a new engine as a base line measurement.
not fair!! the cummins and the 6.4 powerstroke came with blowby from the factory! lol
I got 08 with 105 k and blowby is almost non existent. Maintenance, maintenance and also keeping the regens down.
@@anthonypeak2125 My 2003 has none.
It all depends on the owners. It’s got like 200k miles and most Ram owners neglect their trucks.
I just blew a head gasket on my car, I never filled up the coolent overflow for about a year, I recall squeezing the main hose and hearing/feeling air but never thought it was a big deal until now I have major blowby and it smokes white. Sucks to suck
I use a manometer, which is basically what this tool is.
Love your channel.
You could use a pressure pulse sensor on the dipstick tube into a scope
I love information to Dave knowledge is power mate.
Dave said "Dude" more times in this video than in any other video before!
Simple test. Cap bounces=bad cap doesn’t bounce=good
A 6.4 with blow by 😱 big shock
I feel like this video is THE video I've been waiting for for a long *%$ time now, I don't know or remember if there is a similar video to this or not. What I do know is that I wondered about the true seriousness, for lack of a better word, about the blow by on my diesel truck in a more scientific approach with numbers to back up weather or not I should look into getting a rebuild done or wait.
Awesome tool! Curious how it can be utilized to test gapless ring builds and the longevity of the rings sealing abilities. More data the better!
Good stuff!
Blow in it!!
But ive not been drinking Dave I swear😂😂
You should let all your staff blow the meter. If there's any smokers between them, they'll get a shock if they see how weak their lung function is compared to non smokers. When my doctors did that test on me ,I immediately quit😅
Good idea 👍
Bye👋
"Oh wow.....ok that's a shit ton" 2:12
Id love to see this on a "speedofair" piston motor.. make it happen dave thanks in advance!!
More info to come !
John Deere uses a Manometer it measure the move movement of blow by over water with dye in water to see it better. That is a good tool to have. I named my service truck ol Betsy
You sir are a wizard. Thank you so m,uch!
great video!
High end monometer
Great video
This is interesting, I would like to know if there are standards with each model, and how they relate to rise of RPM.
Dig this!