Mercury 40 Service Manual page 208

CYLINDER HEAD
Adjusting Valves
NO. 3 AND NO. 4 INTAKE VALVES
NO. 2 AND NO. 4 EXHAUST VALVES
1. Turn the driven gear and align the "4" mark on the gear with the cylinder head mark "n ".
2. Adjust the valve clearance for No. 3 and No. 4 intake valves and No. 2 and No. 4 exhaust
valves.
(b)
#2 (b)
#4 (b)
Page 4A-12
3
Valve Clearance Specifications (Cold)
Intake Valve (a)
Exhaust Valve (b)
Valve Adjusting Nut Torque
120 lb-in. (13.5 Nm)
(a)
#3 (a)
#4 (a)
0.006 - 0.010 in.
(0.15 - 0.25 mm)
0.010 - 0.014 in.
(0.25 - 0.35 mm)
90-828631R3 MARCH 1999