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  #1  
Old 09-29-2009, 03:27 AM
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92 300d Oil in Exhaust Problem

I just bought a 92 300d with 2.5 turbo. It is fogging up the neighborhood and oil is pouring out the exhaust pipe. I thought it was the turbo and had it rebuilt. Did not solve the problem. I have been reading threads on this site and some have mentioned head gasket if the turbo is OK. It is missing on cyl 1 & 2. I have not done a compression test yet. Don't want to start throwing parts at it until I have an idea what the problem is. This is my first mercedes diesel and I am not that familiar with them. Have driven VW diesel.
I bought the car, filled it with oil and lost 3 quarts in 15 miles. Pretty bad.
When I first started it, it idled fine, but in the process of diagnosing it something happened and it lost power and idle went from 5 to 3 cyl.
All help appreciated.

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Old 09-29-2009, 11:39 AM
92 300D 2.5L OBK #59
 
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OUCH. Look up GSXR posts. He's got some great images and advice.
Follow this link:
Strange cooling system problem - exhaust gas entering system??
You'll see has some links in his post. Great info.

Good luck.
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  #3  
Old 09-29-2009, 03:31 PM
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Keep us informed on what you find. Good luck.
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1993 W124 300D 2.5L Turbo, OM602.962
2000 Chevrolet Cavalier, 2.4L DOHC
2002 Ford Explorer, 4.0L SOHC
2005 Toyota Prius, 1.5L

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  #4  
Old 09-29-2009, 03:40 PM
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If the engine was only missing on number one or the number one injector and pre chamber was oil soaked. I would vote on the head gasket.

There is the oil feed passage to the head directly ahead of the number one cylinder and there have been issues on the 603s. It is possible that the 602 is basically very simular in design. Otherwise a damaged piston but should not be one and two at the same time. Possible a warped head is affecting number one and two cylinders.

Like henry the eight said off with your head is a distinct possibility.
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Old 09-29-2009, 09:17 PM
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Oil Blow

Thanks for the posts. I am thinking it may be the head gasket but guess I will not know until I get into it.
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Old 09-29-2009, 09:26 PM
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If the oil soaking is just in the number one cylinder and the cylinder sprays oil out when turning over with the starter. Thats with the injector removed it is pretty conclusive as a test. The head gasket is gone or the head is warped resulting in the same effect.

Never pull an engine apart until the problem is properly identified. You do not want a puzzle confronting you. In the vast majority of cases a test can be constructed to narrow most things down.

I learnt this the hard way many years ago. My concern has been the suspected involvment of the number two cylinder. This has to be proven or eliminated before the teardown in my opinion. I suspect the number two is okay but if oily as well the head is possibly very badly warped. Any known serious overheating?
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  #7  
Old 09-29-2009, 09:29 PM
92 300D 2.5L OBK #59
 
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Do you have oil in the coolant? Do you have coolant in the oil? Are you able to do a compression test? What are the pressures from a compression test.

If you provide the answers to those questions you'll get better answers and more thorough info/answers. I think you can borrow a compression tester from auto zone. You'll need a diesel compression tester (much higher pressures than gas engine).
Here's more info.

How do you do a compression test?

Keep us updated.
Good luck. The group is here to help.
Bobo
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Old 09-30-2009, 05:25 AM
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I have not yet checked compression but will certainly do so before I start taking things apart. I have already jumped the gun and rebuilt the turbo. Do not know if I needed to do that or not. It was full of oil as well as hte exhaust pipe so I assumed that blown seals was the problem. Put it back together with great expectations only to be disappointed.
I am not getting any oil or compression in the coolant, so if the head gasget is blown, it has to be between cylinder and oil port. I have also thought that it may be a bad piston however there is no significent blow-by in the oil. When you remove the oil cap it is normal.
Your suggestions are helpful. I will check with autozone today and see if they have a compression tester. I saw one at harbor freight the other day for $29. Seems reasonable enough.
Will keep you posted. Any more ideas certainly appreciated.
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  #9  
Old 09-30-2009, 05:48 PM
92 300D 2.5L OBK #59
 
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Right now with out any numbers its taking swags (smart wild ass guesses).
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  #10  
Old 09-30-2009, 07:05 PM
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Swag = Scientific Wild Ass Guess.
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  #11  
Old 10-04-2009, 07:26 AM
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Thanks for the input. I have already made one swag and had the turbo rebuilt thinking it was blown turbo seals. I really do not want to make another one.
As to the valve guide seals, It burns more oil than that. As I explained in my first post, it is pouring oil out the exhaust pipe so whatever the problem is, it is letting oil directly into the cylinder and pumping it out the exhaust. It was bad when I bought it, but something let go inside the engine and now it is pouring oil out the tail pipe. If it is the gasket, it let go completely and I have an open hole.
I plan on doing a compression test this week and I should know more.
Again, thanks for the input.
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Old 10-04-2009, 04:39 PM
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Do you have black/oil around any of the exhaust manifold-head areas? Usually one will show some oil, which would lead you to the cylinder with the bad parts, such as possibly an exhaust valve seal (fairly simple) or a cracked ring (not so simple).
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  #13  
Old 10-04-2009, 05:19 PM
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Amazes me that oil can dribble past the exhaust manifold gasket but there won't be traces of exhaust soot.

Sixto
87 300D
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  #14  
Old 10-04-2009, 07:11 PM
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I know, wierd. I have a black manifold on an 8V71ITI to deal with this winter also, ... looks like another cylinder pack.
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  #15  
Old 10-04-2009, 10:22 PM
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Oil is seeping from manifold of cylinder #1. Seems that must be the faulty one. I will keep you posted on what I find.

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