Clean Spark Arrestor Screen; Adjusting Valve Clearance - Generac Power Systems Guardian Ultra Source 004451-1 Owner's Manual

To clean or replace paper air filter:
• Remove air cleaner cover; then remove foam pre-filter (service
if necessary) and remove paper filter.
• Clean paper filter by tapping it gently on a solid surface. If the
filter is too dirty, replace it with a new one. Dispose of the old
filter properly.
• Clean air cleaner cover then slip pre-cleaner over filter. Next
insert new paper filter into the base of the air cleaner. Re-install
air cleaner cover.
Figure 20 - Air Cleaner
Pre-Cleaner
Filter
To order a new air filter, please contact the nearest authorized
service center at 1-800-333-1322.

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. If unit is used
regularly, inspect and clean more often.
If you use your 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 the screen retaining bracket by removing the screw.
• Slide the spark arrestor screen out from the tail pipe.
• 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 screen and the retaining bracket.
Cover
Base
NOTICE:
NOTICE:
Section 3 — Maintenance
Portable Generator System
Figure 21 - Spark Arrestor

3.6 ADJUSTING VALVE CLEARANCE

After the first 50 hours of operation, you should adjust the valve
clearance in the engine.
Important: If you feel uncomfortable about doing this procedure or
you don't have the proper tools, please take your generator in to the
nearest service center to have the valve clearance adjusted. This is
a very important step to insure longest life for your engine.
To adjust valve clearance:
• Make sure the engine is at room temperature.
• Make sure that the spark plug wire is removed from the spark
plug and out of the way.
• Remove the four screws attaching the valve cover with a #2 or
#3 phillips screwdriver.
• 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. 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.
• Loosen the rocker jam nut. 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).
You must hold the rocker arm jam nut in place as you turn the
pivot ball stud.
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.
NOTICE:
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