Check And Adjust Valve Clearance; Check Valve Clearance - Generac Power Systems G007144 Owner's Manual

Check and Adjust Valve Clearance

Contact an IASD for service assistance.
Proper valve clearance is essential
for prolonging engine life.
Check valve clearance according to the
Schedule. Adjust if necessary.

Check Valve Clearance

NOTE: The engine should be cool before checking the
valve clearance. Adjustment is not needed if valve
clearance is within
Specifications.
1. Perform "To turn the generator set OFF" in
Generator Set Enable/Disable
2. Remove front panel and intake side panel as
described in Remove Front Access Panel
Remove Intake Side
3. Turn off generator set fuel supply and disconnect
battery negative cable to avoid accidental start-up.
4. Remove spark plug wires, and position wires away
from plugs.
5. Remove spark plugs using a 13/16 in. socket
wrench (8 kVA units) or a 5/8 in. socket wrench
(10-13 kVA).
6. Remove the four screws attaching one valve cover
using a 10 mm socket wrench. Remove and discard
gasket.
7. Verify piston is at top dead center (TDC) of its
compression stroke (both valves closed). To move
the piston to TDC, remove the intake baffle at the
front of the engine to access the flywheel nut. Use a
30 mm socket (8 kVA) or 36 mm socket (10-13 kVA)
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.
8. See Figure 4-6. Check the valve clearance between
the rocker arm (E) and valve stem (F) with a feeler
gauge.
Owner's Manual for 50 Hz Air-Cooled Generator Sets
ISO000534
Service
the dimensions provided
Procedure.
Panel.
E
C
Figure 4-6. Check and Adjust Valve Clearance
9. Repeat steps 6, 7, and 8 for second cylinder.
in
10. Install replacement valve cover gaskets.
11. Install valve covers.
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.
and
12. Tighten fasteners in a cross pattern, torquing to 6.8
Nm (60 in-lb).
13. Install spark plugs and torque to 25 Nm (18 ft lb).
14. Attach spark plug wires to spark plugs.
15. Reconnect battery negative cable and turn on
generator set fuel supply.
16. Install intake side panel and front panel.
17. Perform "To turn the generator set back ON" in
Generator Set Enable/Disable
Maintenance
D
F
002380
Procedure.
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