Spark Plug: Service and Repair

CAUTIONS:
^ Allow the engine to cool before removing the spark plugs. Attempting to remove the plugs from a hot engine may cause the plug to seize, causing damage to the cylinder head threads.

^ Clean the spark plug recess area before removing the plug. Failure to do so can result in engine damage due to dirt or foreign material entering the cylinder head or contamination of the cylinder head threads. Contaminated threads may prevent proper seating of a new plug.

^ Do not install plugs that are either "hotter" or "colder" than the heat range specified. Using plugs of the wrong heat range can severely damage the engine.

^ Twist the spark plug boot one-halt turn to release it. Pull on the spark plug boot only. Do not pull on the wire or the spark plug lead may be damaged.

^ These spark plugs have a ceramic insulator that is about 1/8 inch longer than earlier model plugs. Be sure to use a spark plug socket that is deep enough for this longer length plug. Failure to do so could cause cracking of the insulator and arcing in side the plug, resulting in engine miss fire.

^ Make sure each spark plug threads smoothly into the cylinder head and is fully seated. Cross-threading or failing to fully seat spark plugs can cause overheating of the plugs, exhaust blow-by, or thread damage.

REMOVE OR DISCONNECT
1. Make sure the ignition switch is "OFF."
2. Spark plug wires and boots.
3. Label the plug wires.
4. Spark plugs using a 5/8-inch socket.

Inspect
Each plug for wear and gap.

INSTALL OR CONNECT
1. Spark plugs and torque to 15 Nm (11 lbs ft).
2. Wire and boot assemblies.