User manual

28
Engine Maintenance
When all engine servicing is complete, replace 15 Amp fuse
in control board and reset exercise timer.
WARNING Unintentional sparking could cause fire or electric
shock resulting in death or serious injury.
WHEN ADJUSTING OR MAKING REPAIRS TO YOUR GENERATOR
• Disconnect the spark plug wire from the spark plug and place the
wire where it cannot contact spark plug.
WHEN TESTING FOR ENGINE SPARK
• Use approved spark plug tester.
• DO NOT check for spark with spark plug removed.
Adjust Valve Lash
The valve lash must be checked every 100 hours of
operation. Measure valve clearance with the engine cold.
To adjust the valve lash, proceed as follows:
1. Remove spark plug(s) to ease manual rotation of
engine crankshaft.
2. Turn crankshaft counterclockwise until the piston is at
Top Dead Center on the compression stroke.
3. Insert a narrow screwdriver or rod into spark
plug hole as a gauge, then slowly turn crankshaft
counterclockwise until the piston has moved down
the bore by 1/4”.
4. For the Model 31 Engine:
 • Useafeelergauge(A) , measure the valve
clearance.
 • Adjusttherockernuttoobtainthecorrect
clearance as follows: 0.005 (0.013 mm) intake
and 0.007 (0.018 mm) exhaust.
 • Holdrockernutandtightentherockerballset
screw (B) to 45 in/lb (5 Nm).
5. For the Model 35 Engine:
 • Useafeelergauge(A) to measure the valve
clearance.
 • Adjusttheclearancebylooseningthelocknut
(B) then turn the adjusting screw (C) to obtain
the following measurement: 0.005 in. (0.013 mm)
intake and exhaust.
 • Oncetheclearanceisproperlyset,holdthe
adjusting screw while torqueing the lock nut to
70 in/lbs. (8 Nm).
6. Repeat for the other valve, if applicable.
B
C
Model 35 Engine
Model 31 Engine
A
B
A
A
B
B C
NOT
for
REPRODUCTION