| [GMCnet] ATF Leak at Transmission Pan (or chain cover?) [message #307348] |
Sun, 18 September 2016 15:43  |
fbhtxak
Messages: 191
Registered: April 2006
Karma: 0
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Senior Member |
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Thanks for your report on your findings, Ken -
I, then, will just continue to "live with it" as a design flaw and use a
drip pan (as I have done for 23 years!). In preparing the coach for the trek
to GMCMI/Ohio today, 'found about 150 CC leakage since 20 April. The drip
pan avoids a mess on an otherwise clean garage floor. Fortunately, as noted
previously, there is no leakage when the coach is in use.
'Regards,
Fred
Fred Hudspeth
1978 Royale (TZE 368V101335) - Tyler, TX
1982 Airstream Excella (motorhome) - Cooper Landing, Alaska
Date: Fri, 16 Sep 2016 23:54:38 -0400
From: Ken Henderson
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
Fred, et al,
I've checked out that right rear corner of the transmission oil pan where so
many seem to have leaks. It really is a very narrow seating surface --
about 3/32" at most. Trouble is, I don't seen any simple improvement. It
might be feasible to braze the inside of the pan up enough to add 1/8" or so
of surface, but the pan and its flange might be warped enough to either
worsen, or not improve, the situation. One who REALLY trusts JB Weld or
similar epoxy putty might build up that area enough to help -- but I don't
know what the long term durability of epoxy is in ATF.
Sorry I can't really suggest anything useful. :-(
Ken H.
On Mon, Sep 12, 2016 at 7:25 PM, Ken Henderson
wrote:
> Just the other day Manny pointed out one area on the pan flange where
> there's only about 1/16"-3/32" of overlap between the pan and the housing.
> That's where he finds most leaks. All he offered for a solution is
> use of Aviation Permatex on the pan and a cork gasket. Sounds like
> your source and solutions you've tried. Perhaps it's time to consider
> modifying the pan in that area? I'll try to look at one here tomorrow
> to see if I can visualize anything that might work.
>
> Ken H.
>
>>
>> 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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