C4 Leak
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Joined: February 29, 2012
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C4 Leak
I very frustrated with my C4 and need any advice out there. I can't get my transmission fluid pan to seal. I have tried different types of gaskets, gasket sealant, etc. I then ordered a new pan thinking the old one may be slightly warped and the new pan still leaks.
Anyone dealt with this before/ have any solutions that work to get the pan to seal?
Anyone dealt with this before/ have any solutions that work to get the pan to seal?
legacy Tms Member
Joined: January 27, 2007
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From: alerbamer
there are a multitude of things just above the pan that can seep down and mimic a gasket leak .. if a new pan did not solve the issue i`d look elsewhere .. try to flatten the bolt holes on your original pan with a hammer .. they can get puckered over the years and not seat flat ....
GT Member
Joined: July 30, 2013
Posts: 138
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From: Iowa
You know what first went through my mind when I saw this title? "C4 Leak"? Yep. mind does. Just like everyone else.
It's possible to get them to seal, but unless I'm losing significant amounts of fluid, I don't sweat it.
HOSS429's advice is sound. Also look at your transmission mating surfaces, rather than the pan. Possible there is a crack or divot in the surface where the pan joins.
BTW, I am assuming you fastened the bolts in the correct order and that they were torqued with a calibrated torque wrench to the proper values?
It's possible to get them to seal, but unless I'm losing significant amounts of fluid, I don't sweat it.
HOSS429's advice is sound. Also look at your transmission mating surfaces, rather than the pan. Possible there is a crack or divot in the surface where the pan joins.
BTW, I am assuming you fastened the bolts in the correct order and that they were torqued with a calibrated torque wrench to the proper values?
GT Member
Joined: July 30, 2013
Posts: 138
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From: Iowa
Once you remove the pan, using a ball pen hammer tap down any dimples
that
may be from over tightening previously.
Clean both surfaces very clean and dry. I like to use a little ( dont
over
do it ) RTV red on the pan smeared on with my finger ( be careful not
to
lick your fingers after ) once it has had a chance to setup a bit, set
the
good quality cork/rubber gasket ( like a McCord or FelPro ) gasket onto the
pan.
Start all the bolts, fron a center point out evenly snugup all the bolts.
I
generally do it to a snuf feel with a 1/4 ratchet.
Add the appropriate atf fluid and start, drive and test for
leaks...
basically bring it to operating temperature. recheck the fluid. Drive it for
a day or so and recheck the bolts.
GT Member
Joined: July 30, 2013
Posts: 138
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From: Iowa
Believe me, I feel your pain.
I have a policy of oppositional bolt rotation during tightening, as well as accepting a certain amount of leaking as I gradually tighten. I think I avoid over torquing this way.
Hope you are able to figure out the cause and able to fix it.
I have a policy of oppositional bolt rotation during tightening, as well as accepting a certain amount of leaking as I gradually tighten. I think I avoid over torquing this way.
Hope you are able to figure out the cause and able to fix it.
Team Mustang Source
Joined: October 12, 2004
Posts: 502
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From: Tampa, FL
As the others have mentioned, leaks above the pan will cause the fluid to flow down and spread around the pan. I did all the above fixes to the pan: clean, flatten, new gasket, sealant, and proper torquing. Still there was fluid leakage!
Mine was actually caused by a bad O-ring seal around the linkage shaft. I simply used a pick to remove the old one and pressed in a new ring. I also had a leak from the tailshaft and had to replace that seal as well. Now the tranny leaks no more!
But I do have a minor engine leak from the rear main seal! Oh, well.
Mine was actually caused by a bad O-ring seal around the linkage shaft. I simply used a pick to remove the old one and pressed in a new ring. I also had a leak from the tailshaft and had to replace that seal as well. Now the tranny leaks no more!
But I do have a minor engine leak from the rear main seal! Oh, well.
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