Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 213Get this manual

Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 213

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CYLINDER HEAD
3 Check each spring on flat surface using squareRotate spring and check space between the top coi and squareReplace valve springs if not in specification
Valve Spring Tilt Sp