| [GMCnet] ATF Leak at Transmission Pan (or chain cover?) [message #307052] |
Mon, 12 September 2016 13:50  |
fbhtxak
Messages: 191
Registered: April 2006
Karma:
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Senior Member |
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Thanks, Charles -
'Have done that as part of process of defining source of leak (in addition
to "diapering...).
Any thoughts on the chain cover?
There is no evidence of exterior "run-down" at chain cover/case interface...
'Regards,
Fred
Fred Hudspeth
1978 Royale (TZE 368V101335) - Tyler, TX
1982 Airstream Excella (motorhome) - Cooper Landing, Alaska
('Sorry - forgot to add above to earlier post)
Message: 11
Date: Mon, 12 Sep 2016 12:25:53 -0600
From: Charles Boyd
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] ATF Leak at Transmission Pan (or chain cover?)
Message-ID:
Content-Type: text/plain; charset="utf-8"
Brake cleaner and wipe dry. Spray baby powder on suspected area. Start it
up. Round the block maybe.
fbhtxak wrote on Mon, 12 September 2016 14:14
> 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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