Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 109Get this manual
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CYLINDER HEAD
bLock Nut [Torque to 90 lbin(10 Nm)]
cRocker ArmFeeler GaugeValve
10 Reinstall cylinder coverTorque bolts to 70 Ibin(S Nm)11 Reinstall fuel pumpDrive attaching s