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Old 09-17-2010, 11:15 PM   #1 (permalink)
boostedracing
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exhaust gasses coming out of the oil fill and dipstick tube

So I am new to the diesel world but by no means the auto world. I just picked up a 95 Chevy 2500 with the 6.5 turbo. It is a 4 wheel drive manual trans with 140k on the truck. When I got the truck there was an oil leak from somewhere on the drivers side of the upper part of the engine....looked like a valve cover gasket. After talking to some diesel people and lurking online it looked as if my cdr valve was bad....oil in the valve itself and in the tube from the valve to the intake. So I replaced the valve and am still having issues. The oil leak is actually oil blowing out of the dipstick tube. If I have the engine running I have gasses puffing out of the dipstick tube and then if u take off the oil fill cap it puffs out of there too. Does this sound like a bad bottom end that needs to be rebuilt? Any suggestions? Thanks.
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Old 09-17-2010, 11:30 PM   #2 (permalink)
wellgeo03
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You are seeing blow by. Combustion gasses getting into the bottom end. This is usually caused by worn rings, but could be caused by cracked piston(s) or even a bad head gasket.

Doing a compression test will give you a little better idea of what is going on. You should see 400 psi.
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Old 09-17-2010, 11:38 PM   #3 (permalink)
boostedracing
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I also forgot to mention that it blows whitish blue smoke pretty much all the time and I have oil again in the cdr vavle and tube again. Also I did a coolant system pressure test and it isn't leaking anywhere. does it seem like rings though at such a low mileage?
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Old 09-17-2010, 11:55 PM   #4 (permalink)
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That is low mileage, but depending on it's history, it could have ring damage. Heat kills rings. If it has been over heated in the past, it starts to take the temper out of the rings and they wear quickly. Of course this happens over time, and multiple high heat cycles. If it is pushing blow by out the dip stick, it has problems. I just pulled my engine for that exact reason. Lots of blow by, coming out of the dip stick and very large amounts through the CDR valve, causing excessive oil build up in the CDR and intake side of the turbo.
A compression test showed low compression on 5 of the 8. Just pulled the heads last night. Visible vertical wear in a couple cylinders, as well as a cracked piston. Considering this, the engine ran fairly well except for increased oil consumption, very excessive blow by, and very hard starting in the winter. (-15 C and lower). I'd have to say that it has run this way for at least 60 000 kms without catastrophic failure.

Best check is a compression test. With your coolant pressure test passing, it is likely rings. As long as you don't have starting issues (live in a warm climate) and it runs fairly smooth, I wouldn't worry too much. A little oil between oil changes is cheap.
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1995 Chevy K2500
6.5L F-code, auto, Buddy's 4 Banger, Ispro gauges, stud girtle, ARP head studs, .006" decked, .010" lower pistons, Felpro head gaskets, high flow injectors, HX 40W-II, 4" Diamond Eye exhaust.
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Old 09-18-2010, 12:21 AM   #5 (permalink)
boostedracing
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Well being I live in the mountains in Wyoming, I am gonna need to fix this cause it get to below -40 degrees here. having not done a compression or leak down test yet to see how bad the damage is, do these engines generally require cylinder walls to be bored out and oversized pistons or can u usually get away with reringing?
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Old 09-18-2010, 01:31 AM   #6 (permalink)
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You can usually get away with a re-ring as long as there is no damage to the cylinder walls. Just hone the cylinders really good.
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Old 09-18-2010, 03:52 AM   #7 (permalink)
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Does this blow appears only at iddle and decreases or even disappears if you rev up a bit the engine, say, about 2000 rpms ?

I've seen several of ours doing that here, and they still run fine...
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Old 09-23-2010, 02:58 PM   #8 (permalink)
boostedracing
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i spoke with the previous owner of the truck the other day and i had asked him what kind of oil he was running in the truck cause it seemed really thin. He told me that he was using 10w-30 synthetic. So after hearing that i did an oil change and put in 15w-40 rotella. the oil leaking or whatever has now stopped and i have better oil pressure now....go figure. The engine does still show some blow by out the dipstick tube and oil fill cap. The gasses coming out do increase with rpm increases. The truck does still plume out bluish white smoke out the exhaust pretty much all the time but when i do step on the gas hard it bellows out black smoke.
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Old 09-23-2010, 04:33 PM   #9 (permalink)
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The previous owner was (unfortunately) typical of many 6.5 owners - totally clueless about the engine, and ran the snot out of it.

Blue smoke out the tailpipe constant means your burning oil - lots of it. That's a problem, even more so if you have emissions testing to deal with as that's an automatic fail.

If not, you have some *serious* engine wear going on for it to be burning enough oil when running to generate blue smoke.

The black smoke is another issue, but also one you'll want to address ASAP if you want this (already sick) engine to survive. There are several links in my signature dealing with black smoke, I'd suggest you read both.
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Old 09-23-2010, 05:46 PM   #10 (permalink)
boostedracing
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I have a feeling that most of the oil that the truck is burning is the oil that is coming out of the cdr valve and being sprayed into the intake right before the turbo. i just dont understand why it is doing this....is is because of the blow by?
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