| [GMCnet] ATF Leak at Transmission Pan (or chain cover?) [message #307048] |
Mon, 12 September 2016 13:14  |
fbhtxak
Messages: 191
Registered: April 2006
Karma:
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Senior Member |
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I have isolated the source of the leak to the right rear corner of the pan
(as seated in the driver seat). 'Have "diapered" all case penetrations to
insure that no ATF is coming from them. 'Have tried many different pan
gaskets over the years (and gasket sealants) but none completely stops the
leak. The gasket that appears to work the best is a NAPA # 14525. Emery
Stora reports using this gasket with good success. I installed that gasket
during the last service about 6K miles ago.
The NAPA gasket controls the leakage to about 1/2 pint (measured from a drip
pan) over several months of non-use.
There is no leakage when traveling (as observed from no blow-back onto a
clean, oil-free underbody).
There does not appear to be a problem with the integrity of the
transmission case or pan at the leak location.
I have been unable to convincingly rule out the chain cover as the source of
(or contributor to) the leak. If mine is leaking, the source would be from
just above the pan/case interface location stated above.
Thoughts on proving(or disproving) the chain cover as the source of the
leak?
Also, thoughts on why the pan still leaks (if not from the chain cover)
despite my attempts with a variety of gaskets (and sealants applied to the
gaskets) to stop it.
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