i have a 1994 350 s class turbo diesal.runs perfect. one problem. the car consumes oil at a alarming rate. it does not leak. it must be burning. any thoughts or ideas would be greatly appreciated.!
First thought that comes to mind with burning oil in a turbo diesel is the turbo. I believe it's possible for seals/bearings to start to fail in the turbo and begin allowing oil into the intake. I really don't know much about the S350, though, and I would bow to a better opinion.
Also, consider posting on www.mercedesshop.com. It's a little more technical over there.
First thought that comes to mind with burning oil in a turbo diesel is the turbo. I believe it's possible for seals/bearings to start to fail in the turbo and begin allowing oil into the intake. I really don't know much about the S350, though, and I would bow to a better opinion.
Also, consider posting on www.mercedesshop.com. It's a little more technical over there.
Brett
thats absolutely right, in fact its a common problem in any older turbocharged vehicle, fixing such a problem is not very expensive.
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Mercedes-Benz, W140 S class 300SE
You could check with others, Jonathon would be a good start.
I believe I was told that the engine block from that period suffered from some specific engineering problems including the a severe issue with the process used to "harden" the cylinder walls, leading to a host of problems with mid-mileage engines.. a lot of engines from that period has serious issues that lead to MB engine replacement under warranty..which has since long elapsed..
You could check with others, Jonathon would be a good start.
I believe I was told that the engine block from that period suffered from some specific engineering problems including the a severe issue with the process used to "harden" the cylinder walls, leading to a host of problems with mid-mileage engines.. a lot of engines from that period has serious issues that lead to MB engine replacement under warranty..which has since long elapsed..
I'd check out the story...
The story is more or less like this:
M.B. just basically enlarged the cylinder walls on the previous 3.0 liter to convert it to 3.5 liter, without any reinforcement to the block. This procedure severely weaked the cylinder walls which causes a catastrofic failure of the cylinder head (usually cylinder No.1, but sometimes others at the same time too).
Your oil consumption could be a sign of this catastrophic failure due to be happening soon.
Mercedes assumed the HUGE cost of fixing the engine on most cars since it happened on models which had less than 50,000 miles. I don't know if they still honor this warranty repair anymore.
I hope this is NOT your problem, buy I would have the engine checked ASAP.
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A. R. R.
S 500 L, 1998
E 320 T, 1995
I am in the middle of this fix right now. The upper timing gear came apart - lost timing - pistons 2 and 5 hit the valves, prob bent rods but not sure - broke cam into 3 pieces. You can see the wear on the cylinder walls from the ovaling due to the screwed up bore/stroke ratio in this motor.
Failure is unrelated to turbo damage I found while taking it all apart. Big oil blow-by in the turbo. All the intake side was oil fouled. Rebuild of the turbo is 485.00 US - will be ready in a week.
Having the head re worked at Dover Cylinder head in Atlanta.
I'm using my 603.971 head with a 603.960 shortblock. Going back to the 3.0 liter before the bore and stroke disaster. I'm posting the pics of the engine work to a website - will give addy when more to see.
BCB Atlanta
Id like to add that Benz has an upgrade for these rods. Seems they used the S300 rods on the S350 at first , that the number 1 conecting rod "bends" which creates blow by. My 603 motor ran but got worse with time. The last time I traveled before the rebuild, I got about 1 Qt. oil per 500 miles driving. Im hoping your fix is an easy one!
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