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Odd Auto Trans Oil Leak
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djkeev Premium Member
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Joined: September 30, 2007
Posts: 29800
Location: Reading Pennsylvania
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PostPosted: Sun Sep 12, 2021 3:20 pm    Post subject: Odd Auto Trans Oil Leak Reply with quote

Not trying to double post but more in the interest of helping those in the future searching for solutions……..,

My 90 Automatic had taken up the bad habit of marking its spot much like an aging Air Cooled unit does.

It was a mix of Coolant and ATF.
The Coolant leaks were an easy fix.

The ATF appeared to be a leaking pan gasket so I dropped it and resealed.

Soon the leak reappeared giving every indicator it was the front of the pan or the oil cooler Orings.

What I found to be the leak, stunned me!
Never have I seen a leak manifest itself so differently than it appeared to be!

Here is my post from my build thread.
I hope it helps others who follow to stop their leak, but I honestly don’t know why it is leaking from this spot.

djkeev wrote:
Went out to the Van with Jack and jack stands.

Jacked it up and crawled under all prepared to put new Orings on the Oil Cooler.

With the increased space (I usually don’t bother jacking it up to work underneath) I had a real clear view of the lower oil cooler mating to the case.

No matter what angle I looked at it from there was no evidence of a leak.

I decided to clean up the entire area and see if I can locate the exact leak source.
A can of brake cleaner and I cleaned everything from the oil cooler to the differential mount area.

After it dried I started up the Van and let it run. I varied the rpms but didn’t drive anywhere.

After the radiator fan kicked on I crawled under while it was still running with my flashlight.

My leak originally seemed to come from the oil pan front edge.
Absolutely dry!

Dipstick tube?

Oil pan sides?

Oil cooler seal areas?

2nd gear piston?

Seal to differential?

Lower left nut holding the transmission to the Differential.
Soaking WET!!!

Image may have been reduced in size. Click image to view fullscreen.

I let it run longer and eventually the oil filled the seam between the two units….

Image may have been reduced in size. Click image to view fullscreen.

You could watch the oil bubble out of the washer below the nut ….

Image may have been reduced in size. Click image to view fullscreen.

I removed the nut and washer, cleaned the area up, smeared it with Hylomar and reassembled.
Started it up…….
It promptly leaked!

Ok …… split lock washer ….. no good.

I had a heavy 8mm washer and an 8mm cap nut.

Cleaned everything up, used my Hylomar and reassembled.

Image may have been reduced in size. Click image to view fullscreen.

Went for a 20 minute drive…….

Dry as a bone!


I realize it isn’t fixed……
But it isn’t leaking either!


Stop Dead Photo Links how to post photos



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