Fixed it - Make sure bolts don't bottom out
I bought a cast iron oil pan off of ebay. The package included the oil pan to engine and the oil pan to tractor bolts. I noticed I used bolts for the oil pan to tractor that were slightly longer when I changed the mounts last year. They bottomed out when I torqued them tight but I am convinced this combination allowed the damage to happened. In my defense, not the easiest place to see. Parts breakdown shows 3/8x2-1/4" bolts. OOPS!
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