Visit The Dirt Forum for More Information

Author Topic:   2 piece rear main seal leaks
racer2
Member
posted January 27, 2003 07:31 PM
small block chevy. is there a Trick to install or shim these seals so they dont leak?


outlawstock17
Member
posted January 27, 2003 07:45 PM
offset the seal halves in the main cap and block and use a dab of silicone where the ends meet. dont' forget to grease or oil the seal where it rides on the crank. if it still leaks after all this, you may have excessive main bearing clearances.


racer2
Member
posted January 27, 2003 07:54 PM
tried that one already.just some leak and some dont...002 on mains


Racer14K
Member
posted January 28, 2003 10:04 AM
Do you know if the seal is leaking between the ends or around the crank. If it's leaking around the crank you could try an offset seal, FelPro #BS11829-1. If it's leaking at the ends I always spray some brake clean on a rag and wipe off any oil residue. I prefer the Ultra Black Permatex silicone, always works great for me. I like to put the seals in straight to get the proper crush between the ends.


DMS CEO
Member
posted January 28, 2003 11:50 AM
If you have your block line bored then you have to compensate for the lack of meat between the mains with the offset or bigger seal. Some standard seals wont leak and some will.


autoshop
Member
posted January 28, 2003 02:35 PM
auto shop is right worked 4 me!!


DMS CEO
Member
posted January 28, 2003 05:25 PM
I tried that and I guess I had too much wear. It still leaked like a civ but I have heard of alot of folks doing that.


rico 08
Member
posted January 28, 2003 06:39 PM
more on what dms said if it's a 400 line bored thru the main seal lip it will really leak use a fel pro seal designed for this forget the part # though.


racer2
Member
posted January 28, 2003 08:10 PM
racer14k.i cant tell
if its the lip or the ends..

thx..

racer2
Member
posted January 28, 2003 08:13 PM
i dont think it was line honed. Dms ceo


racer2
Member
posted January 28, 2003 08:18 PM
autoshop. i tried the tie wrap..thing.
when i put it together it bent the crap
out of the seal. looked like i needed to trim the ends of the seal so i said forget it.i guess it might work if you have a .003 tie wrap. but mine were around
.040


DMS CEO
Member
posted January 29, 2003 02:16 PM
The guy that told me about the tie wrap said there is only a certain one you can use.


racer2
Member
posted January 29, 2003 06:17 PM
thank you


66jj
Member
posted January 29, 2003 09:37 PM
line honed 350's only use a stock seal

400 has larger mains therefore when line honed it hones the surface that the rear seal goes on...

i have only built around 20 sbc, and have never had a rear seal leak useing the cheapest avail, i offset it and put 3B on it like chilton manuals say to, maybe im lucky!!!

jeff

DMS CEO
Member
posted January 30, 2003 10:19 AM
The guy that built mine and it leaked has built everything from dragcar to NASCAR motors for Ruttman and Hornaday. He didnt know whether to poop or go blind. I would say you are lucky.


Back to the Archives