Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 118Get this manual

Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 118

CYLINDER HEAD
5If valve clearance adjustment is necessary, hold pivot and loosen lock nut6Insert feeler gauge between rocker arm and valve7Adjust the valve clearance by turning the pivot8When proper clearance is achieved, hold pivot and tighten lock nutTorque lock nut to 90 lb-in(10 Nm)9Recheck valve clearance

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