Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 128Get this manual

Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 128

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

Valve Spring Compressed Pressure (Installed) Closed Height 0.965 in(24.4 mm) 45 (19992000) (2000) 456 (2001Newer) Open Height 0.709 in(17.4 mm) 45 (19992000) (2000) 456 (2001Newer) 17 lbf(7.7 kgf) 24 lbf(10.8 kgf) 24 lbf(10.8 kgf) 31 lbf(14.0 kgf) 39.4 lbf(17.9 kgf) 39.4 lbf(17.9 kgf)

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