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16 Generac
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Power Systems, Inc.
Figure 4.3 – Engine Air Cleaner
See the “Service Schedule,” Section 4.12, Page 19, for rec-
ommended air cleaner maintenance.
4.4 SPARK PLUGS
Reset the spark plug gap or replace the spark plugs as
necessary. See Section 4.12, Page 19.
1. Clean the area around the base of the spark plugs to
keep dirt and debris out of the engine. Clean the
plugs by scraping using a wire brush. Do not “blast”
the spark plugs to clean.
2. Remove the spark plugs and check the condition.
Replace the spark plugs if worn or if reuse is ques-
tionable. See the “Service Schedule,” Section 4.12,
Page 19, for recommended inspection.
3. Check the spark plug gap using a feeler gauge.
Adjust the gap to 0.045 inch (1.1 mm) by carefully
bending the ground electrode (Figure 4.4).
Figure 4.4 – Setting the Spark Plug Gap
4.5 BATTERY MAINTENANCE
The battery should be inspected per the “Service
Schedule,” Section 4.12, Page 19. The following proce-
dure should be followed for inspection:
1. Inspect the battery posts and cables for tightness
and corrosion. Tighten and clean as necessary.
2. Check the battery fluid level of unsealed batteries
and, if necessary, fill with DISTILLED WATER
ONLY. DO NOT USE TAP WATER IN BATTERIES.
3. Have the state of charge and condition checked.
This should be done with an automotive-type bat-
tery hydrometer or load test.
Standby generators installed with automatic
transfer switches will crank and start automatical-
ly when normal (utility) source voltage is removed
or is below an acceptable preset level. To prevent
such automatic start-up and possible injury to per-
sonnel, do not connect battery cables until the
normal source voltage at the transfer switch is
correct and the system is ready to be placed into
operation.
Storage batteries give off explosive hydrogen gas.
This gas can form an explosive mixture around
the battery for several hours after charging. The
slightest spark can ignite the gas and cause an
explosion. Such an explosion can shatter the bat-
tery and cause blindness or other injury. Any area
that houses a storage battery must be properly
ventilated. Do not allow smoking, open flame,
sparks or any spark producing tools or equipment
near the battery.
Battery electrolyte fluid is an extremely caustic
sulfuric acid solution that can cause severe burns.
Do not permit fluid to contact eyes, skin, clothing,
painted surfaces, etc. Wear protective goggles,
protective clothing and gloves when handling a
battery. If fluid is spilled, flush the affected area
immediately with clear water.
Do not dispose of the battery in a fire. The bat-
tery is capable of exploding.
Do not open or mutilate the battery. Released
electrolyte can be toxic and harmful to the skin
and eyes.
The battery represents a risk of high short circuit
current. When working on the battery, always
remove watches, rings or other metal objects, and
only use tools that have insulated handles.
Battery replacement
Generac uses a Group 27F vented type battery that has
600 CCA @ 0º F. Generac’s part number is 058665.
Note:
The BCI number should be located directly on the
battery.
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Air Cleaner
Section 4 — Maintenance
Guardian Liquid-cooled 40 kW Generator