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Old 09-10-2007, 04:00 PM
kartoffelpanzer's Avatar
Join Date: Oct 2006
Location: San Jose, CA
Posts: 63
Little help on transmission plug leak


I just changed my transmission fluid and filter and I'm getting a leak at the drain plug in the pan. My tranny pan doesn't have the separate drain plug, you unscrew the banjo fitting between the oil filler tube and the pan (see attached).

The PO used flat aluminum washers that were really worn. I used M14 copper flat washers on either side of the banjo but am still getting a pretty big leak out the plug. Am I doing something wrong, do I need a different type of washer in here, crush washer or something?


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1979 300SD W116
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Old 09-10-2007, 04:02 PM
carnut's Avatar
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Join Date: Jul 2006
Location: Stockton California
Posts: 637
Yes, crush washers. A regular washer is not soft enough to seal.
81 300CD (sold) 1972 280 SEL 4.5 (sold) 1966 250 S 4 spd (sold) 1974 450 SL (sold) 86 BMW 325ES (sold), 1973 280C (sold) 1988 300 SE.
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Old 09-10-2007, 04:32 PM
toomany MBZ's Avatar
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Join Date: Nov 2006
Location: central Va
Posts: 7,820
Originally Posted by carnut View Post
Yes, crush washers. A regular washer is not soft enough to seal.
Agreed, torque to 10 ft. lbs. Or, for all you metric types, 14 Nm.

83 SD

84 CD
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