Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 149Get this manual

Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 149

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CYLINDER BLOCK AND CRANKCASE

Subtract the camshaft diameter from the oil pan diameter
Inspecting Push Rod
1 Inspect push rod for straightnessreplace if bent2 Replace push rod