Leaky Transmission Oil Pan

tnknepp · July 6th, 2009, 10:28 AM

I've been fighting with a leak in my transmission oil pan for the past several months. I pulled the pan off (manual transmission on 67, 200ci) a few months back and every time I put it back on it leaked around the gasket. I put on the paper gaskets, cork gaskets, rubber gaskets, and even used RTV (high temp gasket version) and it still leaked. I thought perhaps the reason the RTV didn't work was because either there was some transmission fluid on the case which kept it from getting a good seal, or because the metal was too smooth to allow it to get a good grip (which doesn't explain why it sealed everywhere else except in the one spot it leaked). I thought of scouring the case with sand paper, but I also thought that would be a bad idea. Any thoughts on what to do?

460brevill · July 6th, 2009, 08:30 PM

are you talking about the top pan on a manual tranny?

tnknepp · July 7th, 2009, 11:52 AM

No, this is on the bottom of the transmission, on an automatic.

460brevill · July 7th, 2009, 08:19 PM

if you have been through all that it could be coming from somewhere else.put some dye in it and clean it good.then run it and you can see where it is coming from.could bee coming from the lines or the dipstick seal or shift shaft lever.

Katen · July 8th, 2009, 05:37 PM

i have noticed on c4 that it usualy comes from the gear selection shaft. but the question being is where exactly is it leaking. what is closest to it.

tnknepp · July 9th, 2009, 08:18 AM

Hmm, I'll check have to look into this this weekend. I pulled the pan off again (and intend on sealing it w/RTV again, just to make sure I get the best seal) and will have to let it cure before adding more tanny fluid.

460brevill · July 9th, 2009, 09:14 AM

clean the tranny with brake clean.that way you can see where it is coming from.

Cboy · July 13th, 2009, 01:31 PM

I had/have similar prooblem on C-4 and it's coming from the Selector Shaft as previous reply stated.

tnknepp · July 15th, 2009, 09:39 AM

Apparently all I had to do to fix the problem was post online. I took the pan off, cleaned it up, put a ton of RTV on both the pan and the case and bolted it down. I put fluid in last night (only 1-2 quarts, which is what I had in it the last time it leaked (not currently driving it)) and it had not leaked as of this morning. We'll see how it goes...

July 6th, 2009, 10:28 AM	#1
tnknepp Regular 1967 Mustange Coupe, 200i Join Date: Jul 2007 Location: Indiana Posts: 72 iTrader: 0 reviews	Leaky Transmission Oil Pan I've been fighting with a leak in my transmission oil pan for the past several months. I pulled the pan off (manual transmission on 67, 200ci) a few months back and every time I put it back on it leaked around the gasket. I put on the paper gaskets, cork gaskets, rubber gaskets, and even used RTV (high temp gasket version) and it still leaked. I thought perhaps the reason the RTV didn't work was because either there was some transmission fluid on the case which kept it from getting a good seal, or because the metal was too smooth to allow it to get a good grip (which doesn't explain why it sealed everywhere else except in the one spot it leaked). I thought of scouring the case with sand paper, but I also thought that would be a bad idea. Any thoughts on what to do?

July 6th, 2009, 08:30 PM	#2
460brevill Hardcore Enthusiast Join Date: Apr 2007 Location: Farmville VA Posts: 1,327 iTrader: 0 reviews	are you talking about the top pan on a manual tranny? __________________ i sixing 200 six with 300 hp.

July 7th, 2009, 08:19 PM	#4
460brevill Hardcore Enthusiast Join Date: Apr 2007 Location: Farmville VA Posts: 1,327 iTrader: 0 reviews	if you have been through all that it could be coming from somewhere else.put some dye in it and clean it good.then run it and you can see where it is coming from.could bee coming from the lines or the dipstick seal or shift shaft lever. __________________ i sixing 200 six with 300 hp.

July 9th, 2009, 09:14 AM	#7
460brevill Hardcore Enthusiast Join Date: Apr 2007 Location: Farmville VA Posts: 1,327 iTrader: 0 reviews	clean the tranny with brake clean.that way you can see where it is coming from. __________________ i sixing 200 six with 300 hp.

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July 7th, 2009, 11:52 AM	#3
tnknepp Regular 1967 Mustange Coupe, 200i Join Date: Jul 2007 Location: Indiana Posts: 72 iTrader: 0 reviews	No, this is on the bottom of the transmission, on an automatic.

July 8th, 2009, 05:37 PM	#5
Katen Regular 1973 Coupe Mustang as fast as the restoration is going Join Date: Jan 2007 Location: Defiance, Ohio Posts: 142 iTrader: 0 reviews	i have noticed on c4 that it usualy comes from the gear selection shaft. but the question being is where exactly is it leaking. what is closest to it.

July 9th, 2009, 08:18 AM	#6
tnknepp Regular 1967 Mustange Coupe, 200i Join Date: Jul 2007 Location: Indiana Posts: 72 iTrader: 0 reviews	Hmm, I'll check have to look into this this weekend. I pulled the pan off again (and intend on sealing it w/RTV again, just to make sure I get the best seal) and will have to let it cure before adding more tanny fluid.

July 13th, 2009, 01:31 PM	#8
Cboy Look Ma! My First Post! Join Date: Apr 2008 Posts: 1 iTrader: 0 reviews	I had/have similar prooblem on C-4 and it's coming from the Selector Shaft as previous reply stated.

July 15th, 2009, 09:39 AM	#9
tnknepp Regular 1967 Mustange Coupe, 200i Join Date: Jul 2007 Location: Indiana Posts: 72 iTrader: 0 reviews	Apparently all I had to do to fix the problem was post online. I took the pan off, cleaned it up, put a ton of RTV on both the pan and the case and bolted it down. I put fluid in last night (only 1-2 quarts, which is what I had in it the last time it leaked (not currently driving it)) and it had not leaked as of this morning. We'll see how it goes...

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