Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 109Get this manual

Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 109

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CYLINDER HEAD
VALVE SPRING Compressed Pressure (Installed) IntakeExhaust: Closed Height 0.965 in(24.4 mm) 45 (19992000) (2000) 456 (2001 Newer) Open Height 0.709 in(17.4 mm) 45 (19992000) (2000)