John Fenner wrote:You're welcome, O-540 crank cracked longitudinally at flange and oil leak at seal area. O-520 sheared off all crank drive gear bolts
John I am not doubting your knowledge on this, just want some more input. Does this issue happen when the 3 blade setup is balanced and dialed in as it should be, or does it happen when someone haphazardly bolts a 3 blade on a 540? Or is it always destined to happen?