Chevy engine guru's

[Sarge]

My work van is a 1993 G20 (3/4 ton) with a 305 TBI and auto tranny. Motor has 247,5xx miles on it. Just replaced the cat, spark plugs/wires/cap and rotor (all of which were original). Plugs were not fun to do BTW.

Remaining problem is the the rear main is leaking. Leaks about 1 - 1 1/2 QT a day (400 miles per week avg.). If I understand it correctly this motor uses a one piece rear main. Any way to fix it without pulling the motor? Or do I gotta live with it? A reman motor runs almost $2K and that aint happening.

Sarge

 

[Grizzley]

It's a two wheel drive. . .drop the tranny, pull the flex plate, pop out the old seal, install the new one and put it back together. Lot easier than a 4x4.

 

[8Mud]

I my have just been lucky, but the rear main seals on my Chev's is just about the only thing that never went wrong. I've had the heads leak a lot, in various places, especially in 85-86 and later motors. Various gaskets blow out in junks, intake, head, pan and others.
If the rear main is leaking and it has high mileage, I'd be thinking the mains are allowing the crank to wobble around in there quit a bit and maybe chewing up the rear seal. Or you have a half inch chunk of pan gasket missing, which I've seen before.