very slow ATF leak on 1998 S90

thefisch · Post by **thefisch** » 06 Mar 2020, 19:32

We have a very slow leak of ATF fluid. When I say slow, I mean I don't get any drops on the ground after a drive but I do see fluid accumulating on cables that run alongside driver side of ATF pan. If I wipe the cables and edge of the pan clean, then after another drive and wipe off, I get a very small amount of fluid on a towel.

We previously replacing the o-ring on a servo cover on the driver side that was leaking and resealed the ATF pan. The leak does not appear to be coming from there.

ATF fluid is not low and shifts are fine.

Is there a weep hole on this transmission? Other than servo covers and the pan seal, are there other likely leak locations I should check?

dm635 · Post by **dm635** » 07 Mar 2020, 09:33

This would be worse case. Perhaps the front trans seal.
But I think if it were that it would drip straight down between engine and trans.
And there is the shift shaft seal.

thefisch · Post by **thefisch** » 07 Mar 2020, 18:26

Will check the shift shaft seal again. No sign of leak near front of transmission. Must be coming from above the pan.

thefisch · Post by **thefisch** » 04 Jan 2021, 17:27

Following up on this, had to get the car on a lift for a couple of days after it was wiped clean to spot the leak location. There was a tiny bit of fluid seeping from the pan seal that had been done the year before. Redid the seal and no leak so far.

Post by **RickHaleParker** » 04 Jan 2021, 17:36

Power wash clean. Add some Trace Dye to the ATF. Use a Ultraviolet Light trace the leak back to the source.

thefisch · Post by **thefisch** » 04 Jan 2021, 17:39

Thanks Rick. That's going to be the next step if the leak reappears.

Post by **MoVolvos** » 04 Jan 2021, 17:59

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The ATP AT-205 Re-Seal took care of a mystery seepage.
https://www.amazon.com/ATP-AT-205-Re-Se ... 173&sr=8-1

viewtopic.php?f=11&t=91668&p=522606#p522606

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