Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 131Get this manual
CYLINDER BLOCK AND CRANKCASE
CRANKSHAFT
REFNOQTYTORQUE DESCRIPTION CRANKSHAFT WASHER KEY CONNECTING ROD BOLT PISTON PIN ERING PISTON PISTON RINGTOP PISTON RINGSECOND OIL RING