S-Class (W126) 1979-1991: 300 SE, 300 SEL, 380 SE, 380 SEL, 420 SEL, 500 SEL, 560 SEL, 360 SEC, 500 SEC, 580 SEC, 300 SD TURBODIESEL, 300 SDL TURBO, 350 SD TURBO, 350 SDL TURBO

420SEL trans fluid from square hole driv side

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Old 11-08-2015, 05:41 PM
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'87 420SEL
420SEL trans fluid from square hole driv side

Hello Everybody,

Tried to look this up everywhere - about half a quart so far on ground leaking directly from square hole on block just in front of where it mates to bell housing.

What is this hole - it looks like an access point, and anyone else have idea how to fix a tranmission fluid leak like this? Automatic, typical '87 420 engine. Left side of photo is towards front, this is driver's side view.

Thank You!!
Attached Thumbnails 420SEL trans fluid from square hole driv side-87benz_fluid_sqhole.jpg  
Old 11-10-2015, 01:32 AM
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1988 560SEL
If it's definitely coming OUT of that hole, the source has to be from the trans front seal or pump housing (busted) O-Ring ... you'll have to drop the trans to inspect & confirm. Be absolutely SURE that trans fluid cooler lines aren't the culprit 1st ...

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