aren't some 50DN use gear drive?
I just can't imagine what else in the engine could melt copper and drop it in oil but still have the engine run normally. Thrust bearing maybe? If that was really tight at initial startup I suppose it could melt down the thrust flanges. Might check the crank for end play.Jim
Have any of you ever seen anything like this? This was found in the oil pan of a Series 60 engine powering a Newell.