2001 Mercury Mariner 50-60HP Factory Service Manual, Page 228Get this manual

2001 Mercury Mariner 50-60HP Factory Service Manual, Page 228

CYLINDER HEAD
5Measure valve stem runout, replace if out of specification
Valve Stem Runout Limit (Max Intake Valve Exhaust Valve 0.0006 in(0.016 mm)

Valve Springs
1Check each spring under load on spring testerReplace any weak springs

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