How to diagnose engine oil consumption. Compression and leak-down test | Redline Update #6
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- เผยแพร่เมื่อ 13 ต.ค. 2024
- Our 1969 Chevrolet Camaro is consuming oil. Lots of it. Davin runs through a series of tests to identify the problem in the 396. Dry and wet compression tests show that the oil is coming up through the rings, but the leak-down test on the big block drives that conclusion home.
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Three years later and this video is the gift that keeps on giving. What an excellent presentation. Thank you!
Ok I'm just baffled and annoyed that someone would dislike this guys videos!! He is very much the same kind of guy that taught me all the knowledge I have and I very much enjoy these tutorials. People pay tuition to learn far less than Davin can teach you in minutes.
I have become addicted to redline rebuild videos Maybe more so than watching breaking bad. I think the first clue of my Addiction was when I reschedule a quarter end results staff meeting to watch the Buick nailhead update video number 4
Im glad you have your priorities in order. 👍
Keep living your dreams
Keep these videos coming! I love this professional step by step methology to solving problems.
Out of curiosity what would you recon a service like this would cost the owner?
Keep up the good work! All the best from Denmark
Bought an 1978 GMC 3/4 ton pick up big block454 at very low price with all plugs fouling. Did compression tests all good enough. Intake manifold looked wet, so cleaned, tanked and then magna fluxed. Filings showed crack running from side to side right under the carb intake. It was sucking oil up through crank case. Installed new intake manifold and no more fouling. I used and abused the truck for years and sold it to a friend and still running strong with no fouling. Workhorse gust gas hog averaged 12.5 mpg.
When doing a leakage test I've always just balanced that particular cylinder on TDC so you don't have to worry about the engine swinging around and valves opening on you. Start off with #1 top dead and work your way through the firing order. Can use something long and thin like a welding rod or a long screwdriver through the plug hole to feel when the piston stops. 👍
Nice video! Tomorrow my rebuilt muncie M21 4 speed gearbox is going in my '72 Camaro and I will start my 396 again! So looking forward to driving her again. And more videos from you. All the best from Norway.
best of luck,you are a very lucky guy.check and recheck everything you can and make sure to setup your clutch,pressure plate etc right.(im sure you will)_
@@trillrifaxegrindor4411 Thank you! Yes I'm lucky and, yes, I will check and recheck. This is my hobby so no rush. All the best to you!
Another success of a video! and even when the diagnostic was not good I'm glad it happened so we can enjoy more of your videos!!! Thanks a lot for taking the time! They are clear, very well produced and with an excellent crew!!!
My diagnoses is, stuck oil control ring on cylinder 3 for sure, and sticky oil ring on the rest, from short runs and lack of oil changes.The oil looked nasty when it was drained. It will be interesting to see, when you get it apart, what the true problem is. Great video!
Thank you for taking the time to really explain what you are testing and why. Seeing the process as a whole really helps me know how to approach my own engine issue diagnosis.
It’s crazy that you guys put out these videos for free.
Yaaaa we I'll be watching new rebuild. This is the perfect way to diagnos engine. Thank you for the class.
That’s some of the most educational engine diagnostics I’ve seen. Mind you I can turn the wrench but don’t know why. Kind of a lego piece rebuilder if you will. Learning the why is fascinating. Thanks!
If the rings are bad, try check the dipstick after/while the engine running. Piston rings should seal oil & combustion chamber in two way, if the rings broke exhaust gas will pass through the ring and you can find exhaust gases from dipstick.
My Honda magna was burning oil and this video saved my ass. Thanks guys!
Thanks! That is the best, most straight-forward explanation of these tests I have seen.
These videos are so good, love em, please post more!
Thank you, i had a problem recently with my 4.6 grand marquis. I coudnt figure out where the oil was consuming. It didnt had no leaks. Thank you so much
From looking at the other plugs, the ones covered with ash, I'd say the motor is running hot consistently (wrong octane fuel or low quality fuel). The ash could also be from a small bit of oil leakage into a hotter cylinder. Not all oil burning shows up as an oil foul symptom like the plug he is working on. Great vid. I'd like to find out in a future video what the ash deposits are from for sure.
Very informative video! Sad though for an engine that was rebuilt only a few years ago, but to be expected I suppose since apparently everyone & their brother are allowed to drive the SS like they stole it without repercussions. Well, like you said, we'll get to see the 396 rebuilt again!
Love the content! Can't wait for the next video about this engine! Greetings from Holland!
Genius! Thanks a million for making the walkthrough. It’s makes so much easier because I have a 442 and had no clue how to diagnose the issue.
Ahhh you are the best Greetings from Greece !!! 🇬🇷🇺🇸
πσσστ κιαλος ελληνας εδω
Δωνεεε !! Παντού είμαστε
Παμε ρε
Hello my friend nice Video
Καλησπέρα πατριώτες
👍 🇬🇷
It’s always a pleasure to see you doing your thing thank you for the information brother
Learned some new stuff and love the image quality of the video!
Thank you for watching! More to come.
The King of diagnostic👍🏻
Enjoy all your Redline videos and especially this one. Learned a lot. Keep them coming!!
Davin's the real deal. I'm glad he's in a good place (plus, free to help us understand some serious engine stuff) and not in some cheap twisted shop with cheap and twisted people.
Great video. I learned so much. Of how to do it the right way.
Something else that can cause this exact problem is a intake manifold gasket failure between the oil passage and the air intake runner
Yup I fixed that issue a couple times on later model 5.7, 5.0, and 4.3 Chevy engines.
Could be, unfortunately you'd have to take the manifold off to find out lol. Ya never know, we'll find out when he tears that bish apart!
well that says it all , Time for a rebuild ! .. Sure had hope on the valve seals being the problem .. ENJOYED
All the dislikes are from people who work at the machine shop that built this Camaro's engine.
Excellent explanation! Thank you. Very helpful.
Thanks to you, this ol' geeser here learned something new today ! Kudos !
More already! Awesome! Nice job! Love the video like always!
This is a great series....more!
Great explanation - thanks for doing this.
Excellent walkthrough.
Great content! Loving this series, but if you ever get back to traveling & working on other people's cars, my garage door is open!
My favorite channel on TH-cam!!!
Hey don't forget that oil can get into cylinders from bad valve guides and worn valve stems also.
Great job. Cheers guys
I was taught if you step on the throttle and get blue smoke its rings. If you back off the throttle and get blue smoke it's valves.
I love watching your videos. Thank you!
Very informative video! Can you expand on what causes the white color on spark plugs? I have an oil consumption problem and have been trying to track it down, after putting new spark plugs in very recently and pulling them to do compression and leak down tests I noticed that all 4 plugs(dodge 2.4L turbo) have a white residue on the ground electrode. Any pointers to send me in the right direction would be greatly appreciated. Cheers!
If you add oil through the plug hole and the engine is on an angle, that oil will sit on the low side of the block. How's the oil going to get over to the other side on the intake side? I love watching others wrench cause I wrench too. Keep the videos coming guys.
Oil will wick into the space between the piston and cylinder around the rings, and as soon as the motor is spun, it will spread and seal.
Thanks. I greatly appreciate it.A good video and explanations
Lol at 12:47.... the dreaded deep breath in to proceed with what you know is coming....
I didnt movt watching this video, very good job, i have the same issue whit my passat, drinks 1 liter of oil at 2000 km, will try to find out here someone who could do compression an leakdown tests, thank you for this info
Make sure the throttle is open when doing the compression test for best results. Great videos
I was mentioning it mainly for people doing it for the first time themselves.
You guys are putting together some great videos!
Keep it up!
love watching these. theraputic somehow..
Engines out ! Looking forward to the rebuild , the 396 is my favorite engine .
Great video thanks! Question; when performing the leak down test does it matter where the piston is in relation to TDC?
No, as long as you loosen the rocker arms so the valves can close. I like to tap the spring retainer to seal the valves in case of carbon build up. But if you don't want to loosen the rocker arms then you need the piston of that cyl at TDC on compression stroke so both valves are closed.
Really good video. It makes clear what really causes high oil consumption (...the rings and not a leak somewhere). If I buy a used car, is there a reliable way to detect if the car has already a high oil consumption (like 1 litre pro 1000 miles) ? Does the compression test also work if there is a lot of carbon built up on the oil control rings ?
Very good information thanks for your hard working..... I appreciate that....... Greetings from Syria.....
Thank you for these great videos.
Chalky white ash deposits is usually fuel additives or oil burning. Looks like #3 was so bad it oil fouled. Time to rebuild and make some big block power.
Why don’t you run the first gauge up to 100 PSI so that you can subtract the second gauge and get the exact percentage of leak down? Why do you stop at 90 PSI? Great video by the way. Most of the videos on TH-cam about how to perform this test are ridiculously wrong
Thank you!
The WHITE on the spark plugs is made by water vapor from the PVC system.....the ring blow-by contains the water vapor....a by-product of previously burned fuel being reintroduced back into the combustion chamber instead of going out the exhaust the first time around
Dave Anderson that's why I made a catch can.
Please do more videos like this. I wouldn’t mind a half an hour video😝
Great instructional video. Question; How do you correctly determine the compression ratio? I know how to figure cylinder and compression chamber volumes but not how to determine dished pistons and piston clearance to the top ring. Thanks
Dropping knowledge one video at a time. 👌
Many more to come!
Hello there, thanks for sharing and Merry Christmas!
Is the oil on the thread of the spark plugs and indication of damage?
If you see the thread of nearly all of them are too oily.
Cheers...
HAGERTY, why didn't you put the cylinder in TDC top deal center when doing the cylinder leak down test? you just removed the intake valve and exhaust value for only cylinder#3?
Showing how to troubleshoot it right. It sucks that it's the piston rings. Valve seals would have been much less of a costly pain in the butt to deal with. Although while you've got it apart I suspect that the heads will get a service too.
Curious on new ring choice.
Sometimes oil can get in the intake port from the bottom of the intake manifold.
But that still means you have blowby at rings and oil gets to intake by PCV hose
With it that bad, I'd imagine you have an oil sample sent out to see fuel dilution, an intake leak on the underside of the intake will do this almost exactly as you've described
A head gasket leak can also cause one or two cylinders to check low, but fouled plugs in this case indicates this is not the problem.
Awesome video. Thanks
Damn I'm only 14 and i actually learnt something, thanks
There's no age to learn something new, Adi.
I'm 66, mechanichely inclined and do most of my cars, mower and snow equipment myself. I heard about Leak Down testing but never knew how it's done. Now, thanks to Davin (?), I know how and why.
If you want to learn even more, look for "Mustie 1" on YT. This nice man is a VW Beetles and busses nut. He buys at garage sales or find on roadsides all kind of small engined equipment or bikes, fix them on the cheap and sell stuff on Craigslist. Amazing mechanic and great teacher at that.
Check him out !
Wonderful tools man !
is the test also for motorbikes? My bike uses too much oil
Welcome
We want to write a link to purchase the scan tool
Thank you
Very informative, learned a lot! Still don't really get what causes the valve stem seals to leak, could somebody explain?
Where are you guys in MI? I’m from Sault ON so I’m more of a Michigan boy than anything else.
i wonder if the valve stem seals could have blowby and can it be heard when leakdown testing??
also what do mean when you talk about the white crust on the sparkplug reffering to leaky stem seals? Thanks! Cheerz!
Great tutorial sir!
Thank you.
Thanks for more info.
Question for you, as to what product and how much you think I should use. I have a 1995 Subaru 1.8L 4-CYL boxer Impreza, 177,000 miles. I have 76 and 78 PSI dry compression in #2 and 4 of one head (driver side). This started a few days ago, we noticed while on a highway trip the power was weak and I can hear it missing as the RPMs drop from driving to idle.
I don't have overheating, excessive oil consumption (drippy seals, I add a quart about every 900 miles), smoking, or fluids cross contamination. I'm waiting to have a leak down and another dry/wet compression test at a different shop. The first shop only did dry compression and wasn't too bright or helpful.
If I end up having a head gasket leak between those two cylinders, what products would I possibly try to mend it? It must not be too bad of a leak, whatever it is, for the compression to build to 78psi dry. The other two good cylinders are 130ish psi.
If it ends up being a valve leak, what products and strength could I try to get them clean? After cleaning, I will have valve clearances checked, as it's probably never been done.
Thanks again.
I have a 305 boat engine with all 180 and 1 cylinder with 150 what do you think about that? Spark plugs look the same, boat sitting for years and did not start it yet since it needs new manifolds. Thank you
Beautiful!!!
I have a question for you. I have a 3.1 V6 engine (LHO, GM) and I have oil in the intake manifold. All spark plugs are very white, with white upper electrodes. Does this mean that oil is burned in this engine? Compression on all cylinders is equal and perfect, 190 psi . The oil quickly turns dark in color. I'm asking for help. Best regards, Adam from Poland
Great content. Thanks!
Hi , you should have hocked your battery to a Battery Charger while Cranking the
Engine to avoid Discharging the battery , right ?
they could make a video showing all the tools and equipment that they have?
well explained thank you!
Hi guys, do you'll work on trucks cuz am having the very same problem on my 8DC9 V8 engine
I have a question because it has always interested me, you can do a leak test, in a healthy motor so you can see how a healthy moter behaves there.
Sure.
Steve Prestek I mean I learned mechanic but I never did a test on a healthy / new engine. That’s was nice.
great video thanks.
Leaking rings..no problem, just pop that motor out and how about a valve job while you're at it..! So, how well did the engine run anyway...?
The leak numbers on #3 are better than #5 because of the oil you squirted in them.
Also can't wait for the timelapse video.
Good point! Conclusion is the same, but yes, you are correct.
I didn't see him add oil to #3 cyl.
@@johnmilner7603 Looks like it got edited out for brevity after he wet-tested the one on the passenger side.
@@Hagerty Simple fact is that they're both leaking down, and the others probably would too, if they were checked - you generally don't bake just two cylinders... :)
That engine seems to have worn out prematurely. Who screwed up and what was it?
He did say it had a lot of heavy use. Who knows how many miles it has or how diligent they were with oil changes
Great video!
Thanks for watching!
Scored cylinder walls also a possibility?
What about oil from the pcv or a bad intake seal?
Put a bigger radiator in the thing when ya drop the rebuilt engine in. You don't want to keep rebuilding every couple years.
HAGERTY,
// If the PSI level values compared to each other cylinders was more than 10% to 20% what would be the problem with the engine?
Could this qualify under PI 1802 code? Lmk please ASAP. Thank you
should the engine be warmed up before this?