Engine Maintenance; Adjust Valve Lash - Briggs & Stratton 040375-02 Manuel De L'utilisation

Engine Maintenance

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).
B
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
B
obtain the following measurement: 0.005 in.
(0.013 mm) intake and exhaust.
• Once the clearance is properly set, hold the
adjusting screw while torquing the lock nut to
70 in/lbs. (8 Nm).
6. Repeat for the other valve, if applicable.
28
A
A
C
When all engine servicing is complete, replace 15 Amp
fuse in control board and reset exercise timer.
A
Model 31 Engine
A
Model 35 Engine
B
C
B