Have developed a Pesky rear main seal leak on my 283 Chevy powered Willys. It is a 64 block. Any thoughts on a Fix other than a partial tear down. Thanks........
What's the problem? Just take the pan off, the rear main cap, lower the crank a tad. Then pull the upper seal, replace the upper seal. Put the lower seal in the main cap and reinstall the cap. tighten up the mains and torque them up. Pan goes back on. Done! Easy!
I remember way back you could go to an auto parts store and buy a "Sneaky Pete" It had a wire you thread into the upper seal and pull it out,and it pulled the new one the same time.....just FYI
Some oil leaks are caused by pressure building up in the crankcase ... make sure that baby can breathe ...
I just pour clean oil in the top and dirty pours out the bottom, keeps the underside of my rig from rusting too....
Just had this problem on new engine. PCV wasn't hooked to a good vacuum sorce and would blow oil past rear main. Found a better vacuum (carb base) and hasn't leaked a drop.
That works if you like working under the car, if the transfer case is in the way, I'd pop the engine out. The last one I did ('65 Belair) I opted to pull it and sit it on the flywheel to do the pan gasket and rear main seal. Bob
Find out where its leaking from and try to drill a couple self tapin screws in to it to try and slow it down.
Is it truly the rear main seal ? As someone has already mentioned, is it the oil pressure line leaking at the back of the block and running down into the bellhousing area ? Is the back intake manifold gasket leaking and running down the back of the block ? Last but not least, are any of the oil galley plugs at the back of the block (in front of the flywheel) leaking ? Many rear main seals have been replaced only to find it was one of the other issues. In the old dealership days, you could put dye in the oild and use a black light to instantly see where the oil was really coming from. Good luck.
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