B2 Piston Cover Leaks 91 300TE
 

1991 300TE, non-4Matic, 259,XXX miles.

Shifts excellent and fluid looks good but it leaks/drips from the B2 piston cover. I'd like to re-seal it as it's more than seepage. Is fixing the leak opening a can of worms? What parts are needed to fix it? Just the seal? New cover?

Any tips on the procedure?

Any advice is appreciated! Thanks!

It is possible to replace the oring with the transmission in place, but it is a tight spot. There are a few pictorials available, dieselgiant comes to mind, but I can't help you search for them just now. One tip I can add that I don't recall seeing in the pictorials is to liberally grease the replacement oring to get it to stay in place when putting the cover back on. Use a thick grease, something about the consistency of Vaseline.

Here is the link. You don't need to go beyond just replacing the red orind as show.

http://www.dieselgiant.com/Mercedesb2pistonsealreplacementl.htm

Thanks pwogaman.

Can the piston be kept in place so the pushrod stays in position when replacing only the cover o-ring?

Yes

I concur PW. The B2 will not pop-out, nor is it spring loaded..

All the best,

Martin