Rear main seal leak - The 1947 - Present Chevrolet & GMC Truck Message Board Network

MIKE'67 · 08-12-2002, 03:50 PM

Replacing rear main seal??? What all is involved. I have developed a very minor leak around this seal.

6869704X4 · 08-12-2002, 04:22 PM

A very minor leak would just have to leak for awhile on my truck.hehe
If you can get the pan off while in the truck you can do it that way. On my Camaro I pulled the engine. Did it in a day. If you pull the engine and are doing it on a stand make sure the engine is right side up when you pull the pan and when you scrape the old gaskets off. Its a pain working upside down but that way trash wont fall in the motor.

Gordo · 08-12-2002, 05:05 PM

Just be sure the rear main is at fault, could be other items such as oil sending unit/fitting, intake gasket and valve cover gaskets. I don't know if your standard or automatic but if a rear main is leaking you will see wet traces of oil spinning off the front of the flywheel/flex plate when you drop the dirt covers down. If the front of the flwheel is dry, look somewhere else for your leak.

08-12-2002, 03:50 PM	#1
MIKE'67 Registered User Join Date: Nov 2001 Location: Albertville, Alabama USA Posts: 299	Rear main seal leak Replacing rear main seal??? What all is involved. I have developed a very minor leak around this seal. __________________ 1977 Short Stepside, black, 350/350. Located in Albertville, Alabama.

08-12-2002, 04:22 PM	#2
6869704X4 Registered User Join Date: Jul 2002 Location: SE NM Posts: 769	A very minor leak would just have to leak for awhile on my truck.hehe If you can get the pan off while in the truck you can do it that way. On my Camaro I pulled the engine. Did it in a day. If you pull the engine and are doing it on a stand make sure the engine is right side up when you pull the pan and when you scrape the old gaskets off. Its a pain working upside down but that way trash wont fall in the motor. __________________ The more I learn about women, the more I love my truck.

08-12-2002, 05:05 PM	#3
Gordo Registered User Join Date: Jan 2001 Location: Killingworth, CT. USA Posts: 3,378	Just be sure the rear main is at fault, could be other items such as oil sending unit/fitting, intake gasket and valve cover gaskets. I don't know if your standard or automatic but if a rear main is leaking you will see wet traces of oil spinning off the front of the flywheel/flex plate when you drop the dirt covers down. If the front of the flwheel is dry, look somewhere else for your leak. __________________ 1971 C10 swb stepside 350/700R4/3.73posi (retired as of 4/22/03) 1998 S10 short bed 2002 S10 Blazer 1942 Oldsmobile 1958 Massey Harris Pony 1951 Wife Killingworth, Connecticut May those who love us, love us, any of those who do not love us, may God turn their hearts. And if God is unable to turn their hearts, may he turn their ankles so we may know them by their limping. A man who works with his hands is a laborer; a man who works with his hands and his brain is a craftsman; but a man who works with his hands and his brain and his heart is an artist.

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