Generac Power Systems 04389-3 - Manual (Page 22)

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Figure 4.7 — 12 kW and 15 kW Engine
Air Cleaner
Cover
Filter
Screw
4.6 SPARK PLUG(S)
Reset the spark plug(s) gap or replace the spark
plug(s) as necessary. See Section 4.13 for mainte-
nance requirements.
1. Clean the area around the base of the spark
plug(s) to keep dirt and debris out of the engine.
Clean by scraping or washing using a wire brush
and commercial solvent. Do not blast the spark
plug(s) to clean.
2. Remove the spark plug(s) and check the condi-
tion. Replace the spark plug(s) if worn or if reuse
is questionable. See Section 4.13 for recommend-
ed inspection.
3. Check the spark plug gap using a wire feeler
gauge. Adjust the gap to 0.76 mm (0.030 inch)
for 7 kW and 0.50 mm (0.020 inch) for 12/15 kW
by carefully bending the ground electrode (Figure
4.8).
Figure 4.8 – Setting the Spark Plug Gap
4.7 BATTERY MAINTENANCE
The battery should be inspected per the “Service
Schedule,” Section 4.13. The following procedure
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.
DANGER

Do not dispose of the battery in a fire. The
battery is capable of exploding.

A battery presents a risk of electrical shock
and high short circuit current. The following pre-
cautions are to be observed when working on
batteries:
• Remove the 7.5A and 15A fuses from the genera-
tor control panel.
• Remove watches, rings or other metal objects;
• Use tools with insulated handles;
• Wear rubber gloves and boots;
• Do not lay tools or metal parts on top of the
battery; and
• Disconnect charging source prior to connecting or
disconnecting battery terminals.

Do not open or mutilate the battery. Released
electrolyte has been known to be harmful to the
skin and eyes, and to be toxic.

The electrolyte is a dilute sulfuric acid that is
harmful to the skin and eyes. It is electrically
conductive and corrosive. The following
procedures are to be observed:
• Wear full eye protection and protective clothing;
• Where electrolyte contacts the skin, wash it off
immediately with water;
• Where electrolyte contacts the eyes, flush
thoroughly and immediately with water and seek
medical attention; and
• Spilled electrolyte is to be washed down with an
acid neutralizing agent. A common practice is to
use a solution of 1 pound (500 grams) bicarbonate
of soda to 1 gallon (4 liters) of water. The bicar-
bonate of soda solution is to be added until the
evidence of reaction (foaming) has ceased. The
resulting liquid is to be flushed with water and the
area dried.
Section 4 — Maintenance
Air-cooled 7 kW, 12 kW and 15 kW Generators
SET PLUG GAP AT 0.76 mm (.030 inch) - 7kW
0.508 mm (.020 inch) - 12 & 15kW