isx cm2350 oil pump

[JMBT]

Waterloo is right, I took mine off at 750K when doing the rod and main bearings. I took it all apart and micced the gears. Other then a few polished spots on the gear teeth it was the same as a brand new one.

There really isn't much to them to go wrong. No bearings or anything to wear out.

Could your noise be from the gear train above the pump?? Or the first or second rod or main bearings??