Mercury Force 9.9, 15HP Outboards Service Manual, Page 7Get this manual
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TORQUE CHART Special Items CYLINDER HEAD
125 lbin (14 .2 Nm) 30 lb in (3.4 Nm)
STANDARD HARDWARE
Screw or Nut Size 6-32 8-32
91bin(1 .0 Nm) 20 lb in (2.3 N