Crankshaft end play

[Tom Wesenberg]

I also had an engine with a lot of end play, and it didn't leak excess oil. I didn't measure the end play, but it was at least .100". I had to tear the engine down due to the center main being shot.

[George Miller]

Originally Posted by Tom Wesenberg

I also had an engine with a lot of end play, and it didn't leak excess oil. I didn't measure the end play, but it was at least .100". I had to tear the engine down due to the center main being shot.

I'm thinking it has to do with the crank moving back and then forward as the engine turns. when the crank comes back at speed past the seal, the oil comes off the crank in to the flywheel. Why does the crank move back and forward. I think it happens when the rods have a slight twist,or some other thing that is not right. If you have a engine that the crank does not do that,it does not leak.
I could be all wrong.