1998 Mercury 9.9/15HP 4-stroke outboards factory service manual, Page 179Get this manual
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CYLINDER HEAD
a-Gasket (New) b-O-Ring (New) c-Oil Pump Assembly d-Bolt-Oil Pump Oil Pump Bolt Torque 70 lb-in(8 Nm)
Page 4A-32
90-856159R1 AUGUST 1998