Valve Clearance Adjustment; Check Valve Clearance; Adjust Valve Clearance - Generac 7 kW PowerPact Manual Del Usuario

Section 4: Maintenance
Figure 4-5. Spark Plug Gap Measurement
7. Install spark plug. Torque to 20–22 ft-lb (27–30
Nm).
8. Install spark plug boot.
9. Install the enclosure top lid. Tighten fasteners
securely.

Valve Clearance Adjustment

Check the valve clearance after the first 20 hours of
operation, then after 300 hour intervals. Adjust if
necessary.
Important: Please contact an Independent Authorized
Service Dealer for service assistance. This is a very
important step to ensure longest life for the engine.
E
C
Figure 4-6. Valve Clearance Adjustment

Check Valve Clearance

1. The engine should be cool before checking.
Adjustment is not needed if valve clearance is
within the specification
Specifications.
2. Turn the generator OFF.
3. Remove enclosure lid fasteners and lid. Then
remove the back panel.
4. Remove spark plug wire and position wire away
from plug.
5. Remove spark plug.
20
B D
A
in Section
6. Make sure the piston is at top dead center (TDC) of
its compression stroke (both valves closed). To get
the piston at TDC, remove the intake screen at the
front of the engine to gain access to the flywheel
nut. Use a large socket and socket wrench to
rotate the nut and hence the engine in a clockwise
direction. While watching 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.
7. See Figure
rocker arm (C) and the valve stem (D) with a feeler
000211
gauge (E).
8. If valve clearance is 0.002–0.004 in. (0.05–0.1
mm), adjustment is not needed.

Adjust Valve Clearance

See Figure 4-6:
1. The engine should be cool before adjustment.
2. Remove enclosure lid fasteners and lid. Then
remove the back panel (if not already removed).
3. Remove spark plug wire and position wire away
from plug.
4. Remove spark plug.
5. Remove the four screws attaching the valve cover.
Remove and discard gasket.
6. Loosen the rocker jam nut (A) using a 10mm
wrench.
7. Turn the pivot ball stud (B) while checking clearance
between the rocker arm (C) and the valve stem (D)
with a feeler gauge (E). Correct clearance is 0.002–
0.004 in. (0.05–0.1 mm).
NOTE: Hold the rocker arm jam nut in place as the pivot
ball stud is turned.
8. When valve clearance is correct, hold the pivot ball
stud in place with the wrench and tighten the rocker
arm jam nut. Tighten the jam nut to 174 in-lbs (19.68
Nm) torque. After tightening the jam nut, recheck
001071 valve clearance to make sure it did not change.
9. Install new valve cover gasket.
10. Install the valve cover. Tighten fasteners in a cross
pattern, torquing to 35–62 in-lbs (4–7 Nm).
NOTE: Start all four screws before tightening or it will
not be possible to get all the screws in place. Make sure
2 —
the valve cover gasket is in place.
11. Install the rubber plug into the fan screen.
12. Install the spark plug and attach the spark plug wire.
13. Install the back panel. Ensure that the alternator
intake bellow is captured by the frame on back
panel securely with out any kinks. Install enclosure
top lid. Tighten all fasteners securely.
14. Place the generator in AUTO.
4-6. Check clearance between the
Owner's Manual for 7 kW PowerPact™