rear main seal leak questions??

Awyman18 · 01-08-2012, 12:12 AM

ok so my 1990 supra turbo has a rear main seal leak. Its not awful...like a couple drips usually...also my 1992 toyota camry leaked from the rear main seal, but only during the winter time like my supra. Is this a toyota thing or just old seal thing? lol also, in the summer ur seals swell and such, and in the winter they shrink, think its only a winter thing considering its effing cold here? And last question is could a bad pcv valve be the issue? Or bad pcv= exess pressure + cold weather (seal shrinkage) = minor oil leak? Not a big deal if i have to change the seal, but if its something minor id rather do that instead of dropping the tranny and such

cre · 01-08-2012, 02:48 AM

No, it's not a Toyota thing... It's a 20+ year old car thing.

Yes, the seal is most definitely on it's way out. A blocked PCV system may contribute but the amount of pressure that would be required to blow the seal would present far more severe symptoms elsewhere. The leak increasing in volume when cold is typical.

Awyman18 · 01-08-2012, 05:42 AM

ok just wondering lol i mean yea i plan on changing the pcv valve anyways, and probably this coming up spring ill change the rear main seal, depending on if the leak is still there or watever. thanks boss

01-08-2012, 12:12 AM	#1
Awyman18 3" Exhaust Join Date: Apr 2011 Location: columbus Posts: 151	rear main seal leak questions?? ok so my 1990 supra turbo has a rear main seal leak. Its not awful...like a couple drips usually...also my 1992 toyota camry leaked from the rear main seal, but only during the winter time like my supra. Is this a toyota thing or just old seal thing? lol also, in the summer ur seals swell and such, and in the winter they shrink, think its only a winter thing considering its effing cold here? And last question is could a bad pcv valve be the issue? Or bad pcv= exess pressure + cold weather (seal shrinkage) = minor oil leak? Not a big deal if i have to change the seal, but if its something minor id rather do that instead of dropping the tranny and such

01-08-2012, 02:48 AM	#2
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	No, it's not a Toyota thing... It's a 20+ year old car thing. Yes, the seal is most definitely on it's way out. A blocked PCV system may contribute but the amount of pressure that would be required to blow the seal would present far more severe symptoms elsewhere. The leak increasing in volume when cold is typical. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

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01-08-2012, 05:42 AM	#3
Awyman18 3" Exhaust Join Date: Apr 2011 Location: columbus Posts: 151	ok just wondering lol i mean yea i plan on changing the pcv valve anyways, and probably this coming up spring ill change the rear main seal, depending on if the leak is still there or watever. thanks boss