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Old 01-25-2008, 05:38 PM
KCM KCM is offline
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Join Date: Jan 2004
Posts: 625
Have never replaced the tranny seal, though it should be pretty straight-forward (pull the converter off and extract the seal). The crankshaft seal is roughly the same thing, remove the flywheel/flex disc and extract the seal. The MB repair manual recommends that the housing for the seal not be removed from the block as the mating surfaces are precisely machined. But I took the chance and used a very thin coating of RTV silicone sealant when installing. You want to use very little as you don't want excess dried sealant breaking loose and getting into the engine, and into places such as the camshaft oilers. I would recommend not removing it if you can get by. Of course there are special tools for everything, but if you're careful, ordinary shop tools should work.

You will want to take some very fine (or even very worn) emery cloth to clean up the surface the seal rides on. This applies to the transmission too. If there is a groove in the crankshaft where the seal rides, there are repair seals available which move the lip of the seal to a different location so it does not ride in the groove.

Of course, to do all this you either need to remove the engine, transmission, or both together.
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