Generac Power Systems PowerPact G0069981, Owner'S Manual

Page: 26 / 36

Maintenance
22 Owner’s Manual for 7.5 kW PowerPact™
Spark Plug
Check the spark plug gap and replace the spark plug as
necessary:
1. With the generator shut down, remove the top lid.
2. Clean the area around the base of the spark plug
to keep dirt and debris out of the engine.
3. Gently pull the spark plug boot off of the spark
plug.
4. Remove the spark plug and check the condition.
Install a new plug if the old plug is worn or if reuse
is questionable.
5. Clean the plug by scraping or washing with a wire
brush and commercial solvent. Do not blast the
plug to clean.
6. See Figure 4-5 . Check the spark plug gap using a
wire feeler gauge. The gap should measure 0.030
in (0.76 mm). If the gap is out of specification,
replace the spark plug. See Section 2—
Replacement Parts .
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.
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 in Section 2 —
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.
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 4-6 . Check clearance between the
rocker arm (C) and the valve stem (D) with a feeler
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.
001071
E
B
A
C
D