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3.5 CLEAN SPARK ARRESTOR SCREEN
The engine exhaust muffler has a spark arrestor screen. Inspect and
clean the screen at least once each year (Figure 19). If unit is used
regularly, inspect and clean more often.
If using the generator on any forest-covered, brush-covered
or grass-covered unimproved land, it must equipped with a
spark arrestor. The spark arrestor must be maintained in good
condition by the owner/operator.
Clean and inspect the spark arrestor as follows:
•
Remove muffler heat shield from muffler, removing four screws.
•
Remove spark arrestor from muffler, removing four screws.
•
Inspect screen and replace if torn, perforated or otherwise
damaged. DO NOT USE a defective screen. If screen is not
damaged, clean it with commercial solvent.
•
Replace the spark arrestor and muffler heat shield.
Figure 19 - Spark Arrestor
Heat Shield
3.6 ADJUSTING VALVE CLEARANCE
After the first 50 hours of operation, check the valve clearance in
the engine and adjust if necessary.
Important: If feeling uncomfortable about doing this procedure or
the proper tools are not available, please take the generator to the
nearest service center to have the valve clearance adjusted. This is a
very important step to insure longest life for the engine.
To check valve clearance:
•
Make sure the engine is at room temperature (60° - 80° F).
•
Make sure that the spark plug wire is removed from the spark plug
and out of the way. Remove spark plug.
•
Remove the four screws attaching the valve cover.
NOTE:
Spark Arrestor
Section 3 — Maintenance
Portable Generator System
•
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 up as
high as it can go.
•
Insert a 0.002 - 0.004 inch (0.05 - 0.1mm) feeler gauge between
the 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:
•
Loosen the rocker jam nut (Figure 20). Use an 10mm allen wrench
to turn the pivot ball stud while checking clearance between
the rocker arm and the valve stem with a feeler gauge. Correct
clearance is 0.002-0.004 inch (0.05-0.1 mm).
Figure 20 - Valve Clearance Adjustment
The rocker arm jam nut must be held in place as the pivot ball
stud is turned.
When valve clearance is correct, hold the pivot ball stud in place with
the allen wrench and tighten the rocker arm jam nut. Tighten the jam
nut to 174 in/lbs. torque. After tightening the jam nut, recheck valve
clearance to make sure it did not change.
•
Install new valve cover gasket.
•
Re-attach the valve cover.
Start all four screws before tightening or it will not be possible
to get all the screws in place. Make sure the valve cover gasket
is in place. Replace spark plug.
•
Re-attach the spark plug wire to the spark plug.
NOTE:
NOTE:
13
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