Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 106Get this manual
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CYLINDER HEAD
CAMSHAFT (5 H.P LIFTER PUSH ROD PLATE -2 PIVOT BOLT ROCKER ARM 7 PIVOT NUT EXHAUST VALVE INTAKE VALVE 10 SEAT 11 -12 SPR ING 13 RETAIN ER 14 VALVE KEEPER