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Old 05-06-2001, 07:09 PM
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I have a 91 350 sd I know nothing about--had it for 2 months...throughout which the car was burning oil at the rate of a quart every 5 days on 50 mile commutes per day. Last week, the car profusely smoked white on the highway, and I pulled over to find oil in liquid form pouring out of the exhaust....towed it home...meditated on the cause..made some phone calls...thought it was the turbo bearing...I removed Turbo charger, had it rebuilt, and reassembled it.
Well, it was'nt the turbo charger...hehe....there goes 500.00 I found this forum out of desperation today..guess I should have dug as deep before I trouble shot before.
If anyone has any ideas, or can help, please post or email me...I know nothing about diesel, or turbos for that matter.
THanks in advance for all your knowledge.....this site looks great!!
Skip in VA

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Old 05-06-2001, 08:34 PM
engatwork's Avatar
Join Date: May 2000
Location: Soperton, Ga. USA
Posts: 12,651
My initial thought

would be a head gasket problem. The white smoke usually means that you are getting water (from the cooling system) into the exhaust. I am not too sure about the oil in the exhaust pipe but it does not sound good.
'85 300D
'95 E320
'97 CRV
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Old 05-06-2001, 10:31 PM
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92 350 oil pumper muffler

I just got word that the connecting rod on cyl # 1 was a re-call for this yr model-92 350 sd MB-Can anyone verify this? With the Turbo rebuilt, hence eliminated from the troubleshooting, then what on earth could be wrong with the engine to pump/pour wet oil out of the muffler.
Also thanks for the reply sir--I understand the water mix in the cylinder creating steam out the muffler. I would think head gasket would be the least of my worries.
PS...the engine actually runs!
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Old 05-06-2001, 11:04 PM
Wm. Lewallen
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You say you have oil running out the end of the exhaust? Sounds like the turbo seals have failed or not properly installed. The seals are like small piston rings, and must be installed with care. My 1982 300D-Turbo was doing the same as your car.I called M&D Distributors in Houston,TX and told them what my turbo was doing. Blowing oil out the exhaust pipe. The salesman called me back and told me what I needed. The cost for parts including shipping was $22.31. There is not much to a turbo. It was fairly simple to rebuild.
You say your car starts good and runs good, so I don't think rings would be the problem.I would have the turbo checked again. It could be defective. I have gotten new(Bosch rebuilt) starters and not know they were bad until they had been installed. Of course the dealer will replace it, but you have to take the bad one off and replace it.
Good luck..
Bill Lewallen: Lexington,Ky. Where diesels purr and turbos whirr
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Old 05-07-2001, 04:24 PM
Wm. Lewallen
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T Bill,
I like the picture of your car. I have one like it. Mine is a 1982. Same color, but mine has the alloy wheels. This is the car that I rebuilt the turbo and also the engine last summer after a salesman in the Atlanta area quoted me a price of $85 for one piston. The MB dealer wants over $300 each. I decided to rebuild the engine. The pistons were the Mahle pistons. The same ones Mercedes uses. I bet a lot of MB owners think Mercedes makes the pistons used ln their cars..
Your uncle started a great thing with the M&D Distributors.
You should be proud of him. I heard of them from a guy in Northwestern Canada on the internet.He had once worked for them.
Bill Lewallen;Lexington,Ky. Home of fast horses and dumb asses
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Old 05-08-2001, 01:00 PM
Johnson Chan
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I thought there was a class action lawsuit against MB and they won. Didnt MB supposed to partially pay for a rebuilt engine or do some kind of extended warentee?
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Old 05-08-2001, 08:11 PM
CJ CJ is offline
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Join Date: Jun 2000
Location: Earth
Posts: 1,318
Have you entertained the possibility that it is a head gasket blown and the coolant is leaking out into the exhaust? With all of the soot in the exhauist I could see how you may think that it is oil.
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Old 05-08-2001, 10:36 PM
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This is pure oil..not water

Thanks for the input guys. Yes, I'm shure with the oil having run out of the car so fast, that the engine overheated, and the head gasket blew. However, I must tell you that the oil from the pan is COMPLETELY gone, and the water level is same....and the black oil coming out of the muffler is pure oil....nothing mixed.

Skip in VA
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Old 05-08-2001, 10:51 PM
Wm. Lewallen
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Skip in VA,
I still think the turbo is bad. But you say the head gasket is blown. The manifolds will have to be removed to get the head off, so you will get a chance to check the turbo. Keep us posted..
Bill Lewallen;Lexington,Ky. The place of fast horses and pretty women.
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Old 05-09-2001, 06:06 AM
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Join Date: Aug 2000
Posts: 269

There is an on going problem with the 3.5 6cyl diesel engine. For some reason it bends rods and develops egg shaped cylinders. If you are very persistent or have a good lawyer MB will take care of it. Be the squeekey wheel, keep us posted. Here is a link about it.

Bob D.
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Old 05-09-2001, 08:51 AM
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Join Date: Feb 2000
Location: Columbus Ohio
Posts: 709

You may in for some bad news on your car.....the FIRST thing you should do before you spend any more money on speculation is to take your car to your local MB dealer...they know the exact steps needed with this engine to diagnose....usually starts with a turbo check...if that checks out then a compression and leakdown test is next...unfortunately some of these cars had a tendancy to bend rods #1 and #6(as mine did)...your local dealer should know all about this that point you have three options...1. Have the engine rebuilt(about $8,000) 2.A new MB short block and piston set(about $9000.00) 3..a complete rebuilt long block($10,000) with a 48/50 MB parts and labor warranty
Does your car have less than 75K?...if so MB will probably help you ..if not you are probably on your own
MB has made many modifications to this engine and you will notice the new replacements models have a completely different head design.
I would only let a very skilled technition do this work as I have heard that is of the upmost importance that you get the new generation parts otherwise you could be in for more problems down the road.before my car was fixed my car was burning a quart of oil every 175 miles...but like yours it started perfectly and drove fine..but I was lucky as my work was warranty...I am not sure what I would have opted to do if it was my own dime I was dealing with....good luck
Feel free to e-mail me if you have any questions..

1992 300SD 115K
Columbus Ohio
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Old 01-29-2005, 12:14 AM
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Join Date: Dec 2003
Location: Metro Detroit, Michigan
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Unhappy A reminder to old and a warning for new members.

Why the 350 scares people away.
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1980 240D
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Old 01-29-2005, 12:43 AM
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Zen And The Art Of Diesel
Join Date: Dec 2003
Location: Oklahoma City
Posts: 2,050
Originally Posted by whunter
Why the 350 scares people away.

I just had a guy telling me today he ran across a 350, dead motor, clean car, for about $800. He was thinking about putting his SDL motor in it(original at 350K). I told him to leave well enough alone..

I've also ridden in an original, un-rebuilt 350SD with over 300K on it, using no oil. Nice car, but I was not perticularly impressed to be honest. I think my 300D is faster..
One more Radar Lover gone...
1982 VW Caddy diesel 406K 1.9L AAZ
1994 E320 195K
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Old 01-29-2005, 12:50 PM
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Join Date: Dec 2004
Posts: 554
Oil pouring out of muffler!

hello skip, i take in the wounded and bruised3.5 mercedes, suppose i like pain.
i would be more than happy to advise you on this engine if you want to call me at 15027276903,or if you decide to ditch it call me.
these engines were built with flaws that basically cause a self destruction and being a non sleeved engine requires additional machine work to correct the cylinder problem. i have completed a rebuild proceedure that i feel makes it a stable engine.
some would advise getting another uses engine and it could work but i would not for my own use without correcting the flaws. you had a good used engine before the smoking started. larry perkins,64 old cars(bought the 84 300 td wagon from mexico today)
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Old 01-29-2005, 01:37 PM
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Location: Dallas, Texas
Posts: 338
This same thing happened to a friend of mines car and it was a bad bearing in the turbo / after a rebuild it was good as new

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