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oldcarmark (8/15/2026)
Got it fixed up. Water Pump leaking so I re-installed using Permatex "Right Stuff". With so much good Gasket Replacement RTV Type Stuff around I don't know why I even bothered with Gasket from Best Gasket Set. I used the "Right Stuff" on the Rear Main Seal instead of the Side Seals. Did this last Time I had this apart when I first bought the Car in 2018. Had no problem with Leak after that. "Right Stuff" dries as a flexible Seal which works even as the Engine gets Hot. Not affected by Temperature. When I disassembled the Engine to rebuild I had to cut the "Right Stuff" with a sharp Putty Knife to release the Seal Retainer. Stuff Seals and stays flexible. Seems to Me using the Side Seals is the same Technology used in 1954. There is a better way to stop rear Main Oil Leaks. 1 Minute or 90 Minute "Right Stuff"?
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I used the 90 Minute version on rear Main. No hurry to put it back in Service as I was re-assembling the Motor. Gives more Time to work with it and make sure the Void for Side Seal is completely filled. You should see a very small amount seeping from the side of the Seal Retainer .There is a way to test the Seal for leakage by squirting a small amount of Oil on inside of Seal and try blowing compressed Air from inside and look for bubbles. I believe this is a much better way to do rear Main seal unless You do them as often as some of the Experts do them the old way. If You think about it re-placement Neoprene Rear Seals have been around for Years on most Ford Engines. Most are successful if installed properly on a good Crankshaft Surface. The Y-Block is the only One that has side Seals which is where most Leak from in My opinion. Using "Right Stuff" should fix this Area of Leakage. Others on this Site share that Opinion.
 
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