Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 118Get this manual

Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 118

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CYLINDER HEAD
5 Measure valve stem runout, replace if out of specification

Valve Stem Runout Limit (Max
Intake Valve Exhaust Valve

0.0006 in(0.016 mm)