Service Precautions
Tools Required
J 39358 (Long Reach) Spark Plug Socket
| • | 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 may cause 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 the plugs that are either hotter or colder than the heat range specified. Using plugs of the wrong heat range can severely damage the engine. |
Removal Procedure
- Turn OFF the ignition switch.
- Remove the spark plug wires and boots. Label the spark plug wires.
- Remove the spark plugs using the J 39358 .
- Inspect each plug for wear and for gap.
Notice: Twist the spark plug boot one-half turn in order to release the boot. Pull on the spark plug boot only. Do not pull on the spark plug wire or the wire could be damaged.
Notice: Use the J 39358 or the equivalent. Failure to do so could cause cracking of the insulator and arcing inside the plug, resulting in engine misfire.
Installation Procedure
- Install the spark plugs.
- Install the wire and the boot assemblies.
Notice: Be sure plug threads smoothly into cylinder head and is fully seated. Use a thread chaser if necessary to clean threads in cylinder head. Cross-threading or failing to fully seat spark plug can cause overheating of plug, exhaust blow-by, or thread damage. Follow the recommended torque specifications carefully. Over or under-tightening can also cause severe damage to engine or spark plug.
Tighten
Tighten the spark plugs to 20 N·m (14 lb ft).
