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Old 02-24-2001, 07:23 AM
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Join Date: May 1999
Location: Calgary, Alberta, Canada
Posts: 190
My leak from the transmission in my 300E is getting worse I think. The fluid is coming out right by the torque converter. The torque convertor looks dry but around there is fluid. What is this being caused by? Is it front pump seal failure? I would like to take it out soon to fix the leak but was wondering if the thing had to be dismantled?
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Old 02-24-2001, 12:23 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
We only do front pump reseals on trannies with less than 100K. The rubber seals that fail all have the same life and proper repair of the front seal is about half the cost of a total repair/rebuild.

The front pump/torque convertor seal might be your problem and it only requires the tranny removal and the seal replacement. Unfortunately it is just as likely that the leak is from the large o-ring sealing the iron pump body to the aluminum trans housing. Replacing this seal is not so easy and requires disassembly of the front of the tranny. I would not do one without the other as there is no way of seeing the leak from the outside. Once inside there is oil everywhere and the labor risks of a wrong call make both seals a necessity.

If you go to that trouble for two seals, it then seems a waste to not double that amount for the other hundred or so.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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