ebluekeys

I just replaced the rear main seal in my 289. STILL LEAKS!!!!!! Where can I find an "oversize" seal, and how much oversize should it go? I did the replacement without pulling the transmission. Just removed the crossmember, dropped the pan, loosened the journals took the last onecompletely offand removed/replaced the old seal. I didn't realize I could get "oversize" seals, or I would have done that in the first place!!!!! THis is the 2 piece rubber seal with a steel core.

my77stang

i dunno, but you can get a "seal saver" and knock that on. it will make your crank a little larger OD where the seal rides on.

btw, they are a pain in the @ss to get on [8D]

mustanglover66

are you sure you didn't tear the upper part of the seal putting it in. that happened to me once replacing it that way.

groho

felpro has a hipo rear main seal, part #2901, if i'm correct. I have thesame problem using stock seal. also, there might bea tiny bevel in topedge of the bottom mainbearing cap, which requires a tiny bead of gasket sealer.

67mustang302

Why they ever used a 2 piece seal in the first place is beyond me. How worn was the crank where the seal rides on it?

my77stang

^ for your consideration.....



yeah, those are two pieces of ROPE. used for years in a variety of motors including small block chevys [8D]

67mustang302

Those types of seals(rope) are used on a lot of large industrial stuff. But you expect engines and pumps and compressors that big to leak anyway.

my77stang

for what those industrial motors cost i would be pissed if they leaked LOL

ebluekeys

Thanks for the interesting stories and moral support, but with this being such a prevalent problem, there MUST be an "oversize" two part rear seal made which has a slightly larger INNER DIAMETER to hug the crank OD at that point. If there's anyone who knows a source of such a part, PLEASE chime in. I only want to do this ONE MORE TIME.[]

boss_dude_429

hahaha a detroit is supposed to leak, do you believe that an industrail motor DESINED to leak