Adjust Valve Clearance - Generac Power Systems G0065510 Owner's Manual

Maintenance
F
C
Figure 4-7. Valve Clearance Adjustment (11-22 kW)
7. Install replacement valve cover gasket(s).
8. Install valve cover(s). Tighten fasteners in a cross
pattern, torquing to:
9 kW 80 in-lb (9.0 Nm)
11–22kW 60 in-lb (6.8 Nm)

Adjust Valve Clearance

See Figure 4-6 or Figure
adjust 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 four screws attaching valve cover.
Remove and discard gasket.
4. Verify piston is at top dead center (TDC) of its
compression stroke (both valves closed).
5. Loosen rocker jam nut (C) using a 10 mm wrench
(9-11 kW units) or 13 mm wrench (16-22 kW units.)
6. Turn pivot ball stud (D) using a 14 mm wrench (9
kW units), 8 mm wrench (11 kW units), or 10 mm
hex key (16-22 kW units) while checking clearance
between rocker arm (E) and valve stem (F) with a
feeler gauge. Adjust clearance as per Engine.
NOTE: Hold the rocker jam nut in place as the pivot ball
stud is turned.
30
D
E
002380
4-7. Proceed as follows to
7. When valve clearance is correct, hold pivot ball
stud (D) in place with a wrench and tighten rocker
arm jam nut. Tighten jam nut according to the
following torque specifications:
9 kW 53 in-lb (6.0 Nm)
11 kW 72 in-lb (8.2 Nm)
16–22kW 174 in-lb (19.68 Nm)
8. After tightening jam nut, inspect 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:
9 kW 80 in-lb (9.0 Nm)
11–22kW 60 in-lb (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 tighten to 18 ft-lbs (25 Nm).
12. Attach the spark plug wire to the spark plug.
13. Repeat the process for the other cylinder if
equipped.
Owner's Manual for 60 Hz Air-Cooled Generators