Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 160Get this manual
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CYLINDER BLOCK AND CRANKCASE
dThermostat CoverGasketThermostatBolt M6 25 mm (2)
hIntake ManifoldO-Ring Seal i-Bolt M6 20 mm (4)Flat Washer (4)Cylinder Head CoverGasket