Re: Twin Ultramatic Transmission oil pan bolts
Posted by jgrohn On 2023/5/15 5:28:49
I just wanted to send a thank you and follow up message. My problem turned out to be the oil pan being overtightened and warped. To give you a little bit of a back story. I bought the car January 2022. I took it to an "old car mechanic" in upstate New York. Someone recommended him, and he had a DeSoto sitting out side, so I figured how bad could he be... He replaced the oil pan gasket, and complained that transmission fluid was coming out of the screw holes. He said that he fixed with RTV.
Last year I moved to Finland, and this time I decided to give it a shot myself. I removed the transmission oil pan. While cleaning the pan, I found multiple colors of sealers and gaskets. All the bolts and bolt holes were also covered in RTV. With a straight edge, I could see that the first edge of the pan was relatively straight, however the metal around the bolt holes were all warped. I ended up putting a few blocks of wood for support, and using a hammer and a large round bolt to tap all the bolt holes back down. After cleaning all the bolts and bolt holes, I put in a new cork gasket. I didn't use any RTV, just a bit of vaseline on the gasket, and hand tightened the pan. After a few weeks of driving, the transmission pan has held well. I still have a ton of leaks to fix, but at least the big one is now done.
Oh, and for the loose bolt. Someone had drilled out one of the bolts through the transmission, and replaced it with a longer bolt and nut on the other end. For now I just put it back in since the gasket works.
Attach file:
IMG_6053.jpg (293.00 KB)
Last year I moved to Finland, and this time I decided to give it a shot myself. I removed the transmission oil pan. While cleaning the pan, I found multiple colors of sealers and gaskets. All the bolts and bolt holes were also covered in RTV. With a straight edge, I could see that the first edge of the pan was relatively straight, however the metal around the bolt holes were all warped. I ended up putting a few blocks of wood for support, and using a hammer and a large round bolt to tap all the bolt holes back down. After cleaning all the bolts and bolt holes, I put in a new cork gasket. I didn't use any RTV, just a bit of vaseline on the gasket, and hand tightened the pan. After a few weeks of driving, the transmission pan has held well. I still have a ton of leaks to fix, but at least the big one is now done.
Oh, and for the loose bolt. Someone had drilled out one of the bolts through the transmission, and replaced it with a longer bolt and nut on the other end. For now I just put it back in since the gasket works.
Attach file:
IMG_6053.jpg (293.00 KB)
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