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Old 08-24-2008, 05:09 PM
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Ford C4 pan leak

My project car has a TCI built transmission that has had a pan leak regardless of what I have on there. I had the original TCI chrome pan on it and it leaked. I put two different OEM pans, a leak. Bought a TFS aluminum pan, and it too leaks. I've replaced the gasket each time with a quality rubber based piece from NAPA. This last time I used RTV as a sealant (yeah, not supposed to, I know) It always appears to be the right rear corner. This has me mystified and to the point that it might have a small crack though have not been able to see one. Has this ever been a problem for others? I haven't tried double gaskets yet, but..... I'm going to take one more good look tomorrow, but words of advice - I need 'em .

Dave W

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Old 08-24-2008, 05:54 PM
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try what I always do... glue your gasket to the pan with 3M 80001 trim adhesive, then use just a little sealer with it
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Old 08-24-2008, 07:40 PM
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Is it the pan gasket or leaking around the bolt head?

Pan must be flat so as to not squash the gasket.

I like the rubber gaskets that have the steel inserts in the bolt holes.
Never had one leak.

If all else fails, use Aviation Permatex the brown/black liquid in the can. It never sets up hard, always remains pliable, and is non-disolveable.
Remember all the sealing is INSIDE the bolt holes, not between the hole and the edge of the pan.
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Old 08-25-2008, 08:57 AM
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Quote:
Originally Posted by ScoTFrenzel
Is it the pan gasket or leaking around the bolt head?

Pan must be flat so as to not squash the gasket.

I like the rubber gaskets that have the steel inserts in the bolt holes.
Never had one leak.

If all else fails, use Aviation Permatex the brown/black liquid in the can. It never sets up hard, always remains pliable, and is non-disolveable.
Remember all the sealing is INSIDE the bolt holes, not between the hole and the edge of the pan.
Aviation Permatex is about the only thing I haven't tried. I have yet to find one of those steel insert pan gaskets for a transmission, but for sure my valve covers and engine pan has them. As far as sealing around the bolts - I have done that - by themselves as well as both sides of the gasket this attempt. I'll do a web search for a steel insert pan gasket now while I have my 2nd cuppa mud.

One "lucky" thing - I only put 4 quarts in it and let sit for a leak check while I'm straightening out a dashboard wiring glitch

Dave W
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Old 08-25-2008, 05:08 PM
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I had a revelation - why not torque the bolts to spec ??? They were way too loose - bad (lazy) me, and I know better . Spec is 12-16 lb ft, I did them now to 14 plus RTV'd the one bolt that was dripping. Tomorrow morning, we'll see if they still ooze.


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Old 08-26-2008, 07:30 AM
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Sometimes it's the simple things. Good Luck.
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Old 08-26-2008, 07:53 AM
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Sometimes it's the simple things. Good Luck.
Nothing has been easy on that car lately - and some (most?) have been my (un)doing !!

Dave
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Old 08-26-2008, 12:08 PM
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I hear ya.

I pulled the motor on the mustang a week ago last Friday. The running hot issue wasn't going away and I wasn't very happy with the oil pressure.

So I had it tanked and put all new bearings and rings in it. Got it back together last weekend and took it for a high speed run up the northway last night. Temp was rock solid this time, no more creeping up.

The cause of the problem? When I assembled the engine the first time last March, I had a coolant leak at the intake. I had forgoten to smear some silicone around the water passeges. Well I must have gotten too overzealous with the silicone when I redid it as it squeezed out and formed a restriction in the coolant passage (both heads). I convinced that the block need a good cleaning though as all the flushing that I had done did remove a lot of debris, but it wasn't enough to overcome the restriction.

Temp gauge is stable now and oil pressure is much better. Just need a 90+ degree day to really test it out.
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Old 08-26-2008, 12:21 PM
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Sounds like a combination of years of crud and your zeal in sealing the water passages.


As far as 90+ ....I hope you have to wait until next year especially looking at our predicted temps for tonight - mid to high 40's. Summer has gone.
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