TimAT
Addict, Cruise-In Bird-Run 1 Veteran
Not really a Mod, but info. Maybe need to move or post someplace else?
Kind of generic RMS instructions. same thing applies to SBC or BBC with 2 piece seals..
Once you have the pan down, remove the oil pump and pickup. Remove the rear main cap. The lower half of the seal is right there. Don't scratch the bearing. Take a small screwdriver and pop the lower half out of the cap, then use the screwdriver, (I have one that I did a little bit of grinding on so it's got a better flat end) and push on the exposed end of the upper half of the seal. You may hve to tap it a little bit to break the upper seal loose. Drive it out until you can get a good grip on it and then just walk it on out. Now the old seal is out, clean the block and the seal groove with something like brake cleaner, just hose it out really well.
The trick part is next. GM and the aftermarket have 3 different widths of rear seals. The difference in them is from the dust lip on the back to the wiper lip on the forward side of the seal. The best (and widest one) is the one you need to find. The biggest distance between the two lips. You may have to hunt for it. GM had them all under the same part number, but there are different ones.
For a SBC, take a look at Fel-pro BS 11829-1.
Take the rear main cap to your bench grinder and use the wire wheel on the mating surfaces adjacent to the seal. Don't get so far forward to catch the bearing. Buff the cap, get it really clean. Then hose it down with the brake cleaner too. Let it dry while you install the upper half of the seal.
In the package there is a little plastic "spoon". Use it to install BOTH the upper and lower halves. Put a little bit of grease on the lips of the upper seal. If you don't, the rib on the inside of the seal gets sliced off and will seep underneath the seal. I've seen lots of posts where guys say to offset the ends of the seal. If you decide you want to do that remember there's no way to install the cap without cutting the seal rib off the OD of the seal. I don't recommend it. GM spent big $$ developing the rubber seal.
Once you have the lower seal in place, wipe a little bit of grease on the lips of that seal too. Apply a very thin coat of form-a-gasket or an anerobic sealer or something like that on the cap next to the seal. Not on the seal, but in the shaded areas on this picture. Don't use RTV here- it's too thick and could migrate into the bearing or the drainback groove and cause other problems.
Install the cap, torque to specs and install the oil pump, and pan. I personally haven't used one, but from the feedback I've seen the Fel=Pro one piece pan gasket is the way to go.
Kind of generic RMS instructions. same thing applies to SBC or BBC with 2 piece seals..
Once you have the pan down, remove the oil pump and pickup. Remove the rear main cap. The lower half of the seal is right there. Don't scratch the bearing. Take a small screwdriver and pop the lower half out of the cap, then use the screwdriver, (I have one that I did a little bit of grinding on so it's got a better flat end) and push on the exposed end of the upper half of the seal. You may hve to tap it a little bit to break the upper seal loose. Drive it out until you can get a good grip on it and then just walk it on out. Now the old seal is out, clean the block and the seal groove with something like brake cleaner, just hose it out really well.
The trick part is next. GM and the aftermarket have 3 different widths of rear seals. The difference in them is from the dust lip on the back to the wiper lip on the forward side of the seal. The best (and widest one) is the one you need to find. The biggest distance between the two lips. You may have to hunt for it. GM had them all under the same part number, but there are different ones.
For a SBC, take a look at Fel-pro BS 11829-1.
Take the rear main cap to your bench grinder and use the wire wheel on the mating surfaces adjacent to the seal. Don't get so far forward to catch the bearing. Buff the cap, get it really clean. Then hose it down with the brake cleaner too. Let it dry while you install the upper half of the seal.
In the package there is a little plastic "spoon". Use it to install BOTH the upper and lower halves. Put a little bit of grease on the lips of the upper seal. If you don't, the rib on the inside of the seal gets sliced off and will seep underneath the seal. I've seen lots of posts where guys say to offset the ends of the seal. If you decide you want to do that remember there's no way to install the cap without cutting the seal rib off the OD of the seal. I don't recommend it. GM spent big $$ developing the rubber seal.
Once you have the lower seal in place, wipe a little bit of grease on the lips of that seal too. Apply a very thin coat of form-a-gasket or an anerobic sealer or something like that on the cap next to the seal. Not on the seal, but in the shaded areas on this picture. Don't use RTV here- it's too thick and could migrate into the bearing or the drainback groove and cause other problems.
Install the cap, torque to specs and install the oil pump, and pan. I personally haven't used one, but from the feedback I've seen the Fel=Pro one piece pan gasket is the way to go.
