Valve Clearance - Westinghouse WPX3400 User Manual

8. Put a teaspoon of engine oil into the cylinder and pull the
recoil handle until resistance is felt. At this position the
piston is coming up on its compression stroke and both
valves are closed. Storing the engine in this position will
help prevent internal corrosion. Return the recoil handle
gently.
9. Reinstall the spark plug. Leave the spark plug boot
disconnected to prevent accidental starting.

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.
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.
NOTICE
Exhaust Valve
0.0051 – 0.0067 in
(0.13 – 0.17 mm)
8-12 N•m 8-12 N•m
MAINTENANCE
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.
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