I talked to both Hartzell and the shop that opened and resealed the hub, both were adamant that the hub/propeller cannot be the culprit.
I might have scored the Hub during install, I was careful and meticulous during the job but no way of knowing for sure unless I take it back off the crankshaft and actually inspect the hub.
Otherwise my next best guess is possibly the piston pin plugs based partly on this thread and Mahlon's input.
http://www.vansairforce.com/communit...+flakes&page=9
My plan is to:
- check the oil cooler for additional flakes
- do a compression check to see if the cylinders are still in good shape
and go from there. I am wondering though if I should continue running the engine or do I risk scoring the cylinders if the pin plugs are indeed the cause?
Thank you regarding the lead deposits in the oil, makes a lot of sense and I do only run 100LL.