3. Remove the spark plug caps.
4. Using the spark plug wrench provided in the tool kit, remove the plugs by
rotating them counterclockwise.
5. Reverse the procedure for spark plug installation. Torque to specification.
SPARK PLUG CONDITION
NORMAL PLUG
The normal insulator tip is gray, tan or light brown. There will be few combustion
deposits. The electrodes are not burned or eroded. This indicates the proper
type and heat range for the engine and the service.
TIP
The tip should not be white. A white insulator tip indicates overheating, caused
by use of an improper spark plug or incorrect throttle body adjustments.
WET FOULED PLUG
The wet fouled insulator tip is black. A damp oil film covers the firing end. There
may be a carbon layer over the entire nose. Generally, the electrodes are not
worn. Fouling may be caused by excessive oil or by frequent short trips,
especially in cold weather.
127
MAINTENANCE
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