Mercury Force 9.9, 15HP Outboards Service Manual, Page 171Get this manual

Mercury Force 9.9, 15HP Outboards Service Manual, Page 171

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4 Inspect cl utch Check for cracks at shear pointsCheck for rounding at area that contacts cl utch dogs on forward gearCheck uncompressed length of clutch springIt should be 2-716 in(63 mm) longCheck