Adjust Valve Clearance - Generac Power Systems 15 kW EcoGen Owner's Manual

Maintenance
B
Figure 4-16. 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
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.

Adjust Valve Clearance

See Figure 4-17. Proceed as follows to adjust the valve
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).
5. Loosen the rocker jam nut (C) using a 13 mm
wrench.
.
30
E
C
001414
Figure 4-17. Valve Clearance Adjustment
6. Turn the pivot ball stud (D) using a 10 mm Allen
wrench while checking clearance between the
rocker arm (E) and the valve stem (F) with a feeler
gauge. Adjust clearance as per Specifications.
NOTE: Hold the rocker arm jam nut in place as the pivot
ball stud is turned.
7. When valve clearance is correct, hold the pivot ball
stud (B) in place with a wrench and tighten the
rocker arm jam nut. Tighten the jam nut to 174 in-
lbs (19.68 Nm).
8. After tightening the jam nut, recheck valve
clearance to verify it did not change.
9. Install new valve cover gasket.
10. Install the valve cover. Tighten fasteners in a cross
pattern, torquing to 60 in-lbs (6.8 Nm).
NOTE: Start all four screws before tightening, or it will
not be possible to get all the screws in place. Verify the
valve cover gasket is in place.
11. Install spark plugs and torque to 18 ft-lbs (25 Nm).
12. Attach the spark plug wire to the spark plug.
13. Connect the AVR fan to the AVR using the three
screws.
14. Connect the 4-pin connector to the AVR.
15. Install AVR filter housing so the bottom drops into
the slots, ensuring that the rubber boot is
completely around the fan opening. Install screw to
fasten AVR filter housing to back panel and torque
to 50–96 in-lbs (6–11 Nm)
16. Repeat the process for the other cylinder if
necessary.
Owner's Manual for 60 Hz EcoGen™ Generators
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