Valve Clearance; Troubleshooting - Westinghouse iGen2500c User Manual

MAINTENANCE

VALVE CLEARANCE

Checking and adjusting valve clearance must be done
when the engine is cold.
1. Remove the rocker arm cover and carefully remove the
gasket. If the gasket is torn or damaged, it must be replaced.
2. Remove the spark plug so the engine can be rotated
more easily.
3. Rotate the engine to top dead center (TDC) by pulling the
recoil handle slowly. Looking through the spark plug hole,
the piston should be at the top (both valves are closed).
4. Both the rocker arms should be loose at TDC on the
compression stroke. If they are not, rotate the engine 360°.
5. Insert a feeler gauge between the rocker arm and the
valve stem to measure valve clearance.
Valve Stem
Intake Valve
0.0031 – 0.0047 in
Valve Clearance
(0.08 – 0.12 mm)
Torque
6. If an adjustment is necessary, hold the rocker arm pivot
and loosen the pivot adjusting nut.
7. Turn the rocker arm pivot to obtain the specified
clearance. Hold the rocker arm pivot and re-tighten the
pivot adjusting nut to the specified torque.
Torque: 106 inch-pound (12 N•m)
8. Perform this procedure for the other valve.
9. Install the gasket, rocker arm cover, and spark plug.

TROUBLESHOOTING

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NOTICE
Rocker Arm
Pivot
Adjusting Nut
Rocker Arm Pivot
Exhaust Valve
0.0051 – 0.0067 in
(0.13 – 0.17 mm)
8-12 N•m 8-12 N•m