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

CYLINDER HEAD
Valve Springs
1Check each spring under load on spring testerReplace any weak springs
2Check free length limit of each springReplace valve springs if not in specification[Valve Spring Free Length 1.4911.569 in(37.85 39.85 mm)

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