My A has a huge oil leak, i dropped the oil pan again today to make sure the return tube was free of obstruction. After some searching on line for some remedies i decided to pull the rear main cap and check th babbitt. I found ou that the oil galley didn't conect. I cleaned out the passage and checked the clearance. My question is would this causes my leak
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First of all, the Babbitt was poured to cold, as you can see the holes in the Babbitt which is caused by sluggish, under temp. Babbitt, as the Babbitt will pull air down in the pour, and will harden, leaving holes. It will be even worse on the back side, next to the casting.
The Babbitt shows no signs of peening, so the crank is left to pound the Babbitt to the cast iron, cracking it with hair line cracks that you can't see from the bearing surface, until it gets worst. With out peening the clearance opens up leaving a bigger space for oil leaks, and less lubrication.
The bearing was poured with a jig that had the groove made right on it, and also the oil wells. As you can see the jig was of poor quality, the oil groove never filled out all the way, as it should have, cutting off the oil supply, as if it had no groove at all.
The oil wells are too small, not going clear to the cast edge of the bearing, where they should be.
End play should be .003, and not over .004. If over .006, fix it.
Herm.
