Could also be blown turbo seals causing pressurized crank case also .... Caterpillar has this issue ..... they do a turbo blow test ...

run till warm , pull return line @ block put in bucket with a little oil in it .... start engine ... if u see bubbles its turbo time ....

 

thanks guys im gonna do the blow test and at least pull the front of the truck off and kdp it till the middle of spring. im gonna completely rebuild it, bout the best choice cause i think them rings r burnt up to

 

I'd do a comp. test as previously stated.I'd also do an oil analysis and look for high fuel dilution before cracking into the engine for rings. It would tell you if fuel is getting past the rings and into the oil. I do mine at each oil change and it only costs me $7 from the local Chevron distributor. That's for a pretty in depth spectrometer test that looks for silica (dirt getting in), soot, viscosity, additives, and metals. Kinda like an EKG for engine health. Plus, it can allow for longer oil change intervals if all is well with the previous test.
That isn't a lot of miles for that engine unless it was treated poorly.

Lube Watch oil analysis for preventative maintenance- Chevron

 

I'm a tech for caterpillar, I don't want to make anyone feel stupid but a compression test on a diesel is almost worthless! I've seen engines that the rings were gone pass a compression test great. If you have blue smoke at start up and you have air blowin out the filler tube your rings are shot, as it heats up the smoke will go away because the rings will start to seat in the bore better. The turbo test is always a good thing to check the only time CAT had problems was with the variable geometry turbos, and it almost never happens to a standard one. But it doesn't hurt to check. I'm shocked, with those miles on it she's just getting broke in!

 

That's a fail. If you had read the fsm or worked on a diesel engine with a broken ring you would know why a compression test is the first step. If the rings are "about gone" and it passes compression I'm guessing you dripped oil in cylinder on accident and performed a wet compression test and had no idea you had done it. Will it always show every problem, nope. If it's almost pointless, it why are there about 30 different compression sets avaliable for diesels. Why is their a compression spec?
I can't honestly believe I'm having to post this in response to a supposed caterpillar techs post.
I try not to jump on stupid comments as this board is full of them but your comment is about the stupidest thing I've read in a long time!
This site just fills more everyday with the folks that are to stupid to post places like comp d or other credible sites. Go over to comp d and post your theory. See what happens there.

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We have 1,000,000's of $ in tooling and the old comp tester we have has not been used in over 5 years! It is worthless! I have personally troubleshot and overhauled 100's of engines, always diagnosed them right and never had a failure on one of my overhauls. I and btw CAT doesn't even give a compression spec anymore because they have found its worthless! We will check for blow by, never ever compression! And no back when cat came out with this theory I went down to there training center and they proved it, WITH NO OIL!!! And I know that there are 30+ comp sets out there, that doesn't mean it's right! I have never gotten anything out of a compression test that I couldn't have told you before doing all the work of the compression test!

 

You and cat have good luck with that.
Just a added note, just because a manufacturer doesn't recognize or opt to sell a test doesn't mean it's not a valid test. Just because a manufacturer doesn't publish a spec doesn't mean that any cylinder more than 5-10% of another cylinder is a good cylinder. Ever think maybe their idea is to sell big jobs?
Ever think that the main reason those manufacturers eliminated compression test was the length of time required to remove an injector?
With advances in pressure transducers and compression test methods you can't sit here and tell me that a compression test gives no data to help a diagnosis. More so in the op's application.
If he's got a damaged ring or broken ring that presents itself enough to cause a misfire IT WILL show in a compression test. Follow that with a leak down you can advise the customer prior to tear down of a base cost of repair instead of "let us take you for 400.00 tear down then tell you if it's salvageable or needs a complete rebuild. Etc etc".
My point is that regardless of what a manufacturer says we can prevent a owner from spending money pulling the head if he's going to core the motor instead of a rebuild.

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