1995 Mariner Mercury Outboards Service Manual 50HP 4-Stroke, Page 125Get this manual
Cleaning and Inspection Oil Pump
1Check oil pump components for pitting, scratches, and for the following measurementsReplace oil pump if worn or out of specificationUsing feeler gauge, measure the following oil pump clearances: between outer rotor and pump housing (a) between the inner rotor and outer rotor (b) between the outer rotor and pump housing (c)
Rocker Shaft and Rocker Arm
1Measure rocker shaft diameterReplace shaft if out of specification