Valve Clearance Adjustment; Check Valve Clearance; Adjust Valve Clearance - Generac Power Systems 20 kW Synergy Owner's Manual

Figure 4-6. Spark Plug Gap Measurement

Valve Clearance Adjustment

Check the valve clearance after the first 25 hours of
operation, then as per recommended service interval
(see Table 4-1: Service Maintenance
Adjust if necessary.
Important: Please contact an Independent Authorized
Service Dealer for service assistance. Proper valve
clearance is essential for prolonging the life of the
engine.

Check Valve Clearance

1. Verify that engine is at ambient air temperature.
NOTE: Allow the AVR to complete its cool down before
disconnecting power, which is indicated by the green light
on the AVR turning off.
WARNING
Accidental Start-up. Disconnect the negative battery
cable, then the positive battery cable when working
on unit. Failure to do so could result in death
or serious injury.
WARNING
Electric shock. AVR maintains electrical
charge after generator shutdown. Wait five
minutes before AVR removal. Failure to do
so could result in death or serious injury.
2. See Figure 4-4. Remove screw to release AVR
filter housing from back panel. Remove AVR filter
housing.
3. See Figure 4-7. Depress external latch to
disconnect 4-pin connector (A) from AVR.
4. See Figure 4-8. Remove three screws (B) to
release AVR fan from AVR.
Owner's Manual for 60 Hz Synergy™ Generators
000211
Figure 4-7. Remove AVR Fan Connector
Schedule).
Figure 4-8. Remove AVR Fan Screws
5. Remove spark plug cables from spark plug
terminals.
6. Remove spark plugs.
7. Make sure the piston is at top dead center (TDC) of
its compression stroke (both valves closed). To
move the piston to TDC, remove the intake screen
at the front of the engine to access the flywheel
(000130)
nut. Use a large socket and socket wrench to
rotate the flywheel nut clockwise, which will rotate
the crankshaft. Watch the piston through the spark
plug hole. The piston should move up and down.
The piston is at TDC when it is at its highest point
of travel.
(000223)

Adjust Valve Clearance

See Figure
clearance:
NOTE: Allow engine to cool before adjusting valve
clearance.
1. Remove spark plug wire(s) and position wire(s)
away from plugs.
2. Remove spark plug(s).
3. Remove the four screws attaching the valve cover.
Remove and discard gasket.
4. Make sure the piston is at top dead center (TDC) of
its compression stroke (both valves closed).
A
B
4-9. Proceed as follows to adjust the valve
Maintenance
001404
001414
29