1993 Mercedes 300E Transmission Leak

MERCEDES BENZ
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KEN EVANS
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  • 2 POSTS
my 1993 Mercedes 300E 4-Matic has a leak at the very top of transmission case. I thought it was the modulator valve, removed and replaced (it had a crack in plastic case)but still leaking above it after the car has run for 30-45 min. could it be leaking around transfer case? what else is on the very top that would cause leak? seems like it leaks as pressure is built up. Please advise. Thanks, Ken
Dec 24, 2006 at 2:17 AM
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2CARPRO JACK
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  • 11,533 POSTS
The vents for the trans and transfer case are usually on the top of the trans, might wanna check those to se if one of them is trying to pump fluid out.Other than that there usually isnt too many things on the very top that would leak.
Dec 25, 2006 at 11:39 PM
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2HOWARDS
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Hello, sounds like you have fluid swapping between you transfer case and transmission. More than likely it will be the trans fluid going into the transfer case. You will hardly notice this in the dipstick however it is something that should be resolved. Make sure you find someone who really does know these cars because some old timers would rebuild these cases. There are others that just replaced them which is fine however make sure it is truly the transfer case. Since it is a 93 you may want to put it into test mode until you get this fixed properly. “The Star” Magazine may be helpful in locating a shop in your area.

Hope this helps,
Jan 24, 2007 at 12:56 PM
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Suggested Repair

Inspect the transmission and transfer-case vents on the top of the transmission. A vent can push fluid out as pressure builds after the car has been driven. Few other components on the very top of the case commonly leak.

Conversation Summary

The owner of a 1993 Mercedes 300E 4-Matic reported transmission fluid leaking from the very top of the case after 30 to 45 minutes of running. Replacing a cracked modulator valve did not stop the leak. The expert advised checking the transmission and transfer-case vents, which sit on top and can pump fluid out under pressure, noting that few other top-mounted parts typically leak. Another commenter suggested possible fluid transfer between the transmission and transfer case and recommended diagnosis by a specialist familiar with these cars.

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