Hot Rods rear main seal leaks

Dumb question #1 has anyone ever used oil additive like lukas or blue devil to stop rear main leak,Dumb question #2 did it ever work,41 Flathead.

 

The only way I know for fixing a rear main is to replace it.

 

Part of being a car guy involves buying at least one can of magic cure-all type engine medicine to teach yourself not to do it again .... wonder if they still sell overhaul in a can ?

 

I believe that the magic works by swelling the rubber seal to allow it to tighten around the crank. I’ve heard of people adding a small amount of brake fluid to accomplish this. Being that your dealing with a rope seal I’m not to sure it’ll do much. And I’ve seen the rebuild in a can on the shelf. It’s usually has a lot of dust on it.


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Remind me, did 41's have a rope seal on the back or just a slinger and V groove?

 

Put some 90 weight in a 55 Ford one time to slow down the rear seal leak. It helped.

 

How much does it leak ?

 

Just a slinger; no rear seal on those...