M115 rear main seal leak. - Mercedes-Benz Forum

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post #1 of 1 (permalink) Old 01-21-2011, 01:33 AM Thread Starter
BenzWorld Junior Member
Date registered: Sep 2005
Vehicle: 1970-200 1983-230e
Location: Malaysia
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M115 rear main seal leak.

Like the title says...my W123 with a 2.3L M115 seems to have developed a leak from the rear main seal.

I first realized I had a problem when I saw a pool of oil, maybe 4inches across, where I usually park my car...! Checking the oil it was slightly above the low mark... topped it off and kept an eye on the oil-pressure gauge.

Based on the amount of oil on the ground I expected it to get low fast but surprisingly the level dropped quite slowly.. After some messing about I figured that a lot of the oil was pooling in the bell-housing (held there by the forward motion of the car ?) and when I stopped the car puked it out. Strange thing is when I park the car with the engine running it only drips out and the main part of the leak only starts when I shut off. This engine has some high mileage and maybe blowby/crankcase pressure keeps the engine away from the drain hole?

Anyway....the whole car is not really worth the cost of a re-build so I was wondering if removing the upper-sump and just doing the lower half of the seal is worth the effort. I read in a previous post that the drag link has to come off but are there any other problems..? I also thought of unbolting the engine mounts and jacking the engine up a bit,maybe get a few more inches of clearance. Thoughts on this?

anilv is offline  
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