A/Trans Overfill = Leak (duh) - PeachParts Mercedes-Benz Forum

willyinnv · #1 05-05-2009, 12:36 PM

Aarrggh! - had my A/Trans [ ‘95 all hydraulic 722.5 behind a 3.2 liter Inline 6] at an indep. shop - just a filter change and partial fluid topoff. Shop overfilled it, and while driving home a motorist reported smoke coming out from underneath (result of A/T fluid leaking onto exhaust pipe). At home, I ‘extractor’ drained approx. 1.5 qts. out, to return to normal levels.
Back to the shop, they apologized, and checked the pan gasket was AOK. But now, I have a (previously tight, dry) trans. that leaks, spotting the floor. It’ll be back to the shop, but......did the overfill & 10 mile drive cause a seal or something to go??? What should I look for? And thanX for your input & help here!

TMAllison · #2 05-05-2009, 01:51 PM

Probably excess fluid on the belly pan or blown back on the undercarriage dripping down.

G-Benz · #3 05-05-2009, 03:58 PM

When I accidentally overfilled my trans, the end result was the pan gasket seal blew, and a LOT of fluid was dripping underneath the trans.

No smoke though, so I would have to wonder if perhaps in your case, the excess was coming out of the fill tube? After all, it is in the proximity of the exhaust manifold...

babymog · #4 05-05-2009, 09:05 PM

I've not experienced it, but have been told that it can cause seal damage from internal pressure.

tinypanzer · #5 05-05-2009, 10:03 PM

Document, document, document!

If your trans suffers a premature failure (I'm not saying that it will) then you will want an adequate paper trail to ensure that the shop will be paying for your repairs!!