Generac XP Serie Manuel D'entretien page 14

Maintenance
Figure 13 - Air Cleaner
Base
Cover
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 14). 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.
Figure 14 - Spark Arrestor
Heat Shield
12
Filter
NOTE:
Spark Arrestor
• 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.
3.6 ADJUSTING VALVE CLEARANCE
After the first 50 hours of operation, adjust the valve clearance in
the engine.
When adjusting valve clearance, the engine should be at room
temperature and the piston should be at Top Dead Center (TDC)
of its compression stroke (both valves closed). Correct clearance
is 0.001-0.003 inch (0.03-0.07mm). Adjust valve clearance as
follows:
1. Loosen the rocker arm jam nut. Use an allen wrench to turn
the pivot ball stud while checking clearance between the
rocker arm and the valve stem with a feeler gauge (Figure
15).
Figure 15 — Adjusting Valve Clearance
FEELER GAUGE
ALLEN WRENCH
2. When valve clearance is correct, hold the pivot ball stud with
the allen wrench and tighten the rocker arm jam nut with a
crows foot. Tighten the jam nut to 65-85 inch-pounds torque.
After tightening the jam nut, recheck valve clearance to make
sure it did not change (Figure 16).