[ssdanny69]

Is this normal for it to leak (very small) after installin a new motor? If so, will it decipate after the internal parts set?

[mccorry]

I wouldn't think that the rear main seal should leak at all. Are you sure it is the seal and not the back manifold valley gasket?

[Mark W. Winning]

Only time I had one leak so soon after a rebuild was when I put the seal in with the lip facing the wrong direction.



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Mark
1992 Firebird 355/Six Speed
1991 RS 350 / 700-R4
1987 Toyota Pickup 383 / 500 + HP 10.963 @ 119.95 Slicks / 11.997 @ 114.23 Radials
http://personal.lig.bellsouth.net/~racer383/

[ssdanny69]

I'm fairly certain that it's the rear main seal. I just had the tranny pulled and rebuilt (4spd Muncie) could this have caused it to leak? Thanks for your input!

[mbrekke]

Did you check where the oil pan bolts up to the block in the rear?

Mark

[CarlC]

What about the oil pressure switch or pressure line?

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Click here to see see my car and hear 5-speeds. http://www.geocities.com/casanoc

[mccorry]

hmmmm.....Fresh tranny (std.) and an apparent rear main seal leak. Could it be the front seal on the transmission?

Steve

[pdq67]

400's are known to weep due to the seal backup area being slightly oversize I think after the crank is turned (or something like that). I know my 406 has always weeped slightly and I sealed the rear main seal backup as well as rotated the ends of the seal about a 1/4" plus dabbed on a smidgin of RTV on each end and even put a little on the main cap/block itself. Good luck. pdq676