1998 Mercury 9.9/15HP 4-stroke outboards factory service manual, Page 199Get this manual
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CYLINDER BLOCKCRANKCASE
Water Temperature Below 140 (60 C) Above 158 (70 C)
Valve Lift in(0 mm) Minimum 0.12 in(3 mm)
90-856159R1 AUGUST 1998
Page 4B-17