1997+ Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-826148R2, Page 168Get this manual
Pump Drive Assembly (Variable Ratio Oil Pump)
a 52897 Oil Inlet Ble ed Screw Oil utlet Oil Pump Oil Pump O-Ring (2) Driven ar Drive ar Crankshaft
Adjustments
CarburetorOil Pump Synchronization