Removal Procedures
Tools Required
J 39358 Spark Plug Socket
Observe the following service precautions:
| • | Allow the engine to cool before removing the spark plugs. Attempting to remove spark 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 plug. Failure to do so can result in engine damage due to dirt or foreign material entering the cylinder head, or in contamination of the cylinder head threads. Contaminated threads may prevent proper seating of the new plug. |
| • | Use only spark plugs specified for use in the vehicle. do not install spark plugs that are either "hotter" or "colder" than those specified for the vehicle. Refer to Maintenance Items . Installing plugs of another type can severely damage the engine. |
- 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.
Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Tighten
Tighten the spark plugs to 30 N·m (22 lb ft)
in a new cylinder head and 20 N·m (14 lb ft) in
a used head.
