Generac Power Systems HomeLink 6500 Series Owner's Manual page 21

Figure 4-4. Spark Plug Gap
4.3.5 — Air Filter Service
The engine will not run properly and may be damaged if
using a dirty air filter. Clean the air filter every 50 hours or
annually (Figure 4-5). Clean or replace more often if
operating under dusty conditions.
1. Remove air filter cover retaining screw (A) and cover
(B).
2. Wash air filter (C) in soapy water. Squeeze filter dry
in clean cloth (DO NOT TWIST).
3. Clean air filter cover before installing it.
4. Tighten air filter cover screw securely.
NOTE: To order a new air filter, please call 1-888-436-
3722.
C
B
A
Figure 4-5. Air Filter
4.3.6 — Valve Clearance Adjustment
±
• Intake - 0.006 0.0008 in. (0.15
±
Exhaust - 0.008 0.0008 in. (0.20
• After the first 50 hours of operation, check the valve
clearance in the engine and adjust if necessary.
NOTE: If uncomfortable about performing this proce-
dure or the proper tools are not available, take the
generator to the nearest service center to have the
valve clearance adjusted.
HomeLink 6500 Series Portable Generator
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±
0.02 mm) (cold)
±
0.02 mm) (cold)
To check valve clearance:
1. Make sure the engine is at room temperature
(60° - 80° F/ 15.55° - 26.66° C).
2. Make sure that the spark plug wire(s) is removed
from the spark plug and out of the way. Remove
spark plug(s).
3. Remove the six screws attaching the valve cover(s).
4. Make sure the piston is at Top Dead Center (TDC)
of its compression stroke (both valves closed). To
get the piston at TDC, pull the recoil handle slowly
while watching the piston through the spark plug
hole. The piston should move up and down. The
piston is at TDC when it is up as high as it can go.
5. Insert a 0.006 in. (0.15 mm) feeler gauge (A), for
intake clearance, between the intake rocker arm
and valve stem (Figure 4-6). Insert a 0.008 in. (0.20
mm) feeler gauge, for exhaust clearance, between
the exhaust rocker arm and valve stem. Correct
clearance is when a slight drag is felt when sliding
the gauge back and forth. If the clearance is either
excessively loose or tight the rocker arms will need
adjusting.
To adjust valve clearance:
1. Hold the rocker arm pivot with a wrench and loosen
the pivot lock nut (Figure 4-6).
NOTE: The rocker arm jam nut must be held in place
as the pivot ball stud is turned.
2. Loosen the rocker arm pivot and turn the rocker arm
pivot to obtain the specified valve clearance. The
desired clearance for intake and exhaust valves is
the same.
3. Hold the rocker pivot with a wrench and tighten the
lock nut to 69 ft./lbs. (7.8 Nm).
4. Install new valve cover gasket.
NOTE: Start all six screws before tightening or it will
not be possible to get all the screws in place.
5. Attach the valve cover. Torque fasteners to 20-48 in./
lbs. / 2.3-5.4 Nm. Torque fasteners in a cross pattern.
A
Figure 4-6. Valve Clearance Adjustment
6. Attach the spark plug boot to the spark plug.
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