rear main seal

gringo76

gringo76

New member
new build and got a rear main seal leak. I installed a new fel pro seal and the mother is leaking. I made sure it didn't get lip rolled back when I installed it. Is there a certain brand that is better than others? I wanna make sure it doesn't leak again due to the pain in the ass it is to get to.
thanks
 
Don W.

Don W.

Stab it and steer it
Re: rear main seal

You probably have it a little off center. Doesn't take much, ask me. Are you sure it's the seal and not the pan gasket?
 
gringo76

gringo76

New member
Re: rear main seal

Ya it deff the seal or something above it, if I remember right there is a oil gallery plug up there. Either way gotta pull Trans, yeah!
 
Don W.

Don W.

Stab it and steer it
Re: rear main seal

Ya I know. I actually had that prob a few years ago. For me, believe it or not, it was easier to pull the engine. You actually might think about that since the pan has to at least loosened. The seal itself can be changed without removing the retainer but if it's off center you'll have to loosen the retainer to re-center it.
 
gringo76

gringo76

New member
Re: rear main seal

so put the new rear seal in the retainer and then install it allowing the crank to center it and then tighten it up?
 
Don W.

Don W.

Stab it and steer it
Re: rear main seal

Well sort of. Just make sure that the seal is touching the crank all the way around. I think there is supposed to be a split dowel to align the retainer. Just make sure the seal is dead-center on the crank.

Trans out yet? Once you look at it, carefully, you'll see where it's not centered. Assuming that's what's wrong to begin with.

I dug up the pic of mine. See the gap?

P3120592.JPG
 
gringo76

gringo76

New member
Re: rear main seal

cool deal. haven't taken it out yet. Have to go out of town for a couple days so I will be jumping on it sunday. thanks for the pic for reference.
 
Don W.

Don W.

Stab it and steer it
Re: rear main seal

Well Dave obviously I screwed up on the install. I should have known better, I've done enough of them. Not as may as you but enough. I remember thinking at the time that I have better luck with the old rope seals...:rotf: Last one was a few years ago, didn't leak a drop.

I guess gringo76 and I are an exclusive group of 2. You probably don't want to join...:roll:
 
gringo76

gringo76

New member
Re: rear main seal

well sunday I will report back but I can rule out pan, its dry, oil line adapters, they are gone, rear intake is dry, valve covers are dry, oil pressure adapter dry, so either oil gallery plugs, cam plug or rear main seal or seal adapter. something in that bell housing area. It did get all new oil gallery plugs and cam plug when it was at machine shop so who knows.
 
ed hess

ed hess

race or get outta the way
Re: rear main seal

look for a rear main sleeve. Its made to fix this problem. The rear seal creates a subtle groove in the crank. The sleeve will compensate for this. Easy to install with the tool it will come with.
 
Syclone #1188

Syclone #1188

New member
Re: rear main seal

gringo76 said:
new build and got a rear main seal leak. I installed a new fel pro seal and the mother is leaking. I made sure it didn't get lip rolled back when I installed it. Is there a certain brand that is better than others? I wanna make sure it doesn't leak again due to the pain in the ass it is to get to.
thanks
Click to expand...

I had rear seal leak on a new build, I pulled the transmission and installed a new one without droping the pan. I poped out the old seal from the retainer and hammered in the new seal. Im using a teflon seal. I installed the first one with oil on it and didnt realize it goes on dry. After installing the second seal dry, it fixed the leak.
 
gringo76

gringo76

New member
Re: rear main seal

well got tranny out and it was the rear seal not centered, so I got new one coming along with the sleeve kit(felpro 16258,16301) and hope this fixes this.
 
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