Mercury 40 Service Manual page 207

Adjusting Valves
NO. 1 AND NO. 2 INTAKE VALVES
NO. 1 AND NO. 3 EXHAUST VALVES
1. Disconnect spark plug leads.
2. Turn the driven gear and align the "1" mark on the gear with the cylinder head mark "n ".
3. Adjust the valve clearance for No. 1 and No. 2 intake valves and No. 1 and No. 3 exhaust
valves.
#1 (b)
90-828631R3 MARCH 1999
2
(b)
#3 (b)
Valve Clearance Specifications (Cold)
Intake Valve (a)
Exhaust Valve (b)
Valve Adjusting Nut Torque
120 lb-in. (13.5 Nm)
(a)
#1 (a)
#2 (a)
0.006 - 0.010 in.
(0.15 - 0.25 mm)
0.010 - 0.014 in.
(0.25 - 0.35 mm)
CYLINDER HEAD
Page 4A-11