Generac Power Systems 10 KVA, Owner'S Manual

Page: 29 / 40

Maintenance
Owner’s Manual for Australian 50 Hz Air-Cooled Generators 25
Valve Clearance Adjustment
Inspect valve clearance after the first 25 hours of opera-
tion, then after 400 hour intervals. Adjust if necessary.
IMPORTANT NOTE: Contact an IASD for service
assistance. Correct valve clearance is essential for
prolonging the life of the engine.
Checking Valve Clearance
NOTE: Engine should be cool before checking valve
clearance. Adjustment is not needed if valve clearance is
within dimensions provided in
Engine .
1. Close fuel shutoff valve and disconnect battery to
avoid accidental startup.
2. Remove spark plug wire(s), and position wire(s)
away from spark plug(s).
3. Remove spark plug(s).
4. Remove the four screws attaching valve cover.
Remove and discard gasket. (Repeat for second
cylinder, if equipped.)
5. Verify piston is at top dead center (TDC) of its com-
pression stroke (both valves closed).
NOTE: To move piston to TDC, remove intake baffle at
front of the engine to access the flywheel nut. Use a large
socket and socket wrench to rotate flywheel nut clock-
wise, which will rotate the crankshaft. Watch piston
through the spark plug hole. Piston should move up and
down. Piston is at TDC when at its highest point of travel.
6. See Figure 4-4 . Verify valve clearance between
each rocker arm (A) and valve stem (B) with a
feeler gauge.
Figure 4-4. Valve Clearance Adjustment
7. Install replacement valve cover gasket(s).
8. Install valve cover(s). Tighten fasteners to 6.8 Nm
(60
in-lbs ) in a cross pattern.
Adjusting Valve Clearance
Proceed as follows to adjust valve clearance:
NOTE: Allow engine to cool before adjusting valve clear-
ance.
1. Remove spark plug wire(s) and position spark plug
wire(s) away from spark plug(s).
2. Remove spark plug(s).
3. Remove the four screws attaching valve cover.
Remove and discard gasket.
4. Verify piston is at TDC of its compression stroke
(both valves closed).
5. See Figure 4-4 . Loosen rocker jam nut (D) using a
10mm wrench (8 kVA units) or 13mm wrench (10–
13 kVA units).
6. Turn pivot ball stud (C) using a 10mm wrench (8
kVA units) or 13mm wrench (10–13 kVA units)
while verifying valve clearance between rocker arm
and valve stem with a feeler gauge. Adjust clear-
ance as per
Engine .
NOTE: Hold rocker arm jam nut in place as pivot ball
stud is turned.
WARNING
(000560)
Risk of Burn. Allow the engine to cool before
performing the following procedure. Failure
to do so could result in serious injury.
(000141)
WARNING
Accidental start-up. Disconnect spark plug wires when
working on unit. Failure to do so could result in death
or serious injury.
(000148a)
WARNING
Accidental start-up. Disconnect negative battery
terminal before servicing to prevent accidental
engine rotation. Failure to do so could result in death
or serious injury.
002380
002380
A
D
C
B
WARNING
(000560)
Risk of Burn. Allow the engine to cool before
performing the following procedure. Failure
to do so could result in serious injury.
(000148a)
WARNING
Accidental start-up. Disconnect negative battery
terminal before servicing to prevent accidental
engine rotation. Failure to do so could result in death
or serious injury.