Clean Spark Arrestor Screen; Adjusting Valve Clearance - Generac XP Professional Serie Manual Del Propieratio

Figure 15 - Air Cleaner
BASE
FILTER

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 16). 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 when the engine is at
ambient temperature as follows:
• Remove muffler heat shield from muffler by removing the four
screws.
• Remove spark arrestor from muffler by removing the 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 16 - Spark Arrestor
Heat Shield
COVER
NOTE:
Spark Arrestor
Section 3 — Maintenance
Portable Generator System

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 ambient 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.
• 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 17). 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).
The rocker arm jam nut must be held in place as the pivot ball
stud is turned.
Figure 17 - Valve Clearance Adjustment
NOTE:
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