Hello all, I have an 86 pickup(22r carb/ auto trans) that I just installed a new longblock in. Everything seems to be fine except oil pours out between the trans and block. I assume the seal is bad or installed incorrectly. Is there anything else in that area of the block that could cause this. When I take the trans out to fix it is there anything I can do to keep this from happening again? tips tricks. I didn't personally put the seal in, my wife's cousin who is a "mechanic" for the city did so I can't be sure he did it right. Any help would be appreciated.

 

Same thing happened to me after replacing the engine on my truck, there was a lot of oil pouring between the engine and transmission, i thought it was the rear main seal and after searching on here i found out that i failed to put some RTV silicone on the half moon seals on the valve cover, now, there is no more oil leaking from my engine at all.

 

Definitely check the back of the valve cover. That is MUCH easier to remedy! RTV will work, but I really like the black FIPG (Form In Place Gasket) sealant that comes in a squeeze tube from Toyota. It was a bit pricey but worth the piece of mind for me. I hate doing things twice!

If it's the rear main seal, a new seal might not fix it if there are grooves wore into the crank very deep. You can install a shaft sleeve in the area where the seal lip touches the shaft. There also may be a thinner seal available that seats further back into the seal housing which allows the lips to ride on new shaft surfaces.

It is also easy to replace the input shaft seal of the tranny while you got it out. I just did a 5-speed swap and I replaced the output shaft seals (front and rear drive shaft) while I had easy access. They don't cost that much.

 

My engine was pouring oil out when it was hot. coudn't see where it was coming from but I figured it was up high on engine because it was pouring off of the tranny pan and everywhere. all of the oil. did not put rtv on the brand new valve cover gaskets. could this be the prob

 

By the way, I did a head gasket job on a 94 4runner with 3.0. 2 new heads also

 

I actually did have a small leak at the back half moon plug and had to go back and add FIPG between the plug and head on the bottom and on the top sides where it meets the edge. I agree, you don't need it around the hole perimeter, but I needed it on the plugs. Thanks for the suggestion!

 

The valve covers weren't leaking because there was no smoke. So it has to be the rear seal or the drain plug gasket / washer made of cork or something . I messed it up during draining the oil 3 times. But would that spray the oil all over the transmission.