Preoiling the engine with the BOD(big old drill) would probably given you an indication of a problem. I cavitated the
oil pump and broke the shear pin in my motor.....makes for an interesting roadside repair...hope you can get all the pieces of metal out of the motor....just take one of those small pesky pieces to jam up your
oil pump....high vol' and good
oil make 'em run all day....good luck!