402 Big Block Rear Main Seal

[toolfool]

Tell me the best brand of rear main seal to buy and what you would seal it with. I am going to do this in the truck. I am losing almost a quart of oil every one thousand miles. The rebuild on the motor is really strong and it starts and runs great. I just need to get the rear main seal oil leak fixed. Please mention any tricks or the important things I need to do. This is a stock block in a 1/2 ton truck, bored .040 over, crank was just reground for the first time.

[geezer#99]

First you need to confirm where the oil leak is coming from. Could be your pan, a valve cover, oil pressure fitting or back of the intake. Last on the list would be your rear main.
One drop of oil every 100 feet uses a quart in a thousand miles.

[toolfool]

This is a manual transmission truck.

[toolfool]

The transmission is out, the flywheel is off and it is the rear main seal.

[geezer#99]

Well then just go shopping at your local gm dealer or parts store.
Install per normal procedure. Instructions should be in the seal box. Lip forward, a little oil on the lip, offset the joints with a light smear of form a gasket and you're good.
Fel-pro is what I've used.

[68Gold/white]

Originally Posted by geezer#99

Well then just go shopping at your local gm dealer or parts store.
Install per normal procedure. Instructions should be in the seal box. Lip forward, a little oil on the lip, offset the joints with a light smear of form a gasket and you're good.
Fel-pro is what I've used.

X2
Make sure the lips face the inside of the engine...

[toolfool]

Okay folks, many thanks..