36
MAINTENANCE
11. Turn the fuel shutoff valve to the ON position and
check for any leaks around the threaded joint
where the fuel sediment cup screws into the fuel
shutoff valve. Tightening the fuel sediment cup a
bit more with a spanner should seal off any normal
leak. If this doesn’t work, repeat steps 4 to 10
above taking particular care with installation of the
fuel sediment filter and O-ring.
12. After confirming there are no fuel leaks, turn the
fuel shutoff valve to the OFF position.
sParK Plug MaintEnanCE
Tools required – Spark plug socket wrench
(included), spark plug gap tool or feeler gauge (not
included) and wire brush (not included).
The spark plug must be checked and cleaned after
every 100 hours of use or 6 months and must be
replaced after 300 hours of use or every year.
1. Stop the generator and let it cool for several
minutes if it’s been running.
2. Move the generator to a flat, level surface.
3. Remove the spark plug boot by firmly pulling it
directly away from the engine (see Figure 43).
Figure 43 – Removal of Spark Plug Boot
NOTICE
Never apply any side load or move the spark plug
laterally when removing the spark plug. Applying
a side load or moving the spark plug laterally may
crack and damage the spark plug insulator.
4. Clean area around the spark plug.
5. Use a spark plug socket wrench to remove the
spark plug from the cylinder head by unscrewing it
anti-clockwise (see Figure 44).
Figure 44 – Removing Spark Plug
6. Place a clean rag over the opening created by the
removal of the spark plug to make sure no dirt can
get into the combustion chamber.
7. Inspect the spark plug for:
•
Cracked or chipped insulator; replace the spark
plug.
•
Excessive wear of the electrodes; replace the
spark plug.
•
Excessive carbon or oil fouling of the electrodes;
clean the electrodes with a wire brush or replace
the spark plug.
•
Spark plug gap within the acceptable limits
of 0.70 – 0.80 mm or 0.028 – 0.031 inch (see
Figure 45); after cleaning with a wire brush,
check using a spark plug gap tool or feeler
gauge and adjust by carefully bending the
ground electrode. Always check the gap of a
new spark plug before installing it.
When replacing the spark plug, use only a Champion
RN9YC or equivalent spark plug such as Bosch
WR7DC+, Denso W20EPR-U or NGK BPR6ES.
NOTICE
Use only the recommended spark plug (Champion
RN9YC or equivalent). The use of a non-
recommended spark plug can result in damage to
the engine.
Summary of Contents for WHXC3750
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