Spark Plug: Service and Repair

TOOLS REQUIRED
J 38491 Spark Plug Boot Removal Tool

REMOVAL PROCEDURE
1. Turn OFF the ignition switch.
2. Remove the fuel injector sight shield.




3. Note the position of the spark plug wires before removing the wires.
4. Twist the spark plug boot 1/2 turn before removing the boots.
5. Gently pry the heat shield up from the spark plugs using the J 38491.
6. Remove the spark plug wires from the spark plugs.
7. Remove the spark plugs from the engine.

INSTALLATION PROCEDURE
1. Measure the spark plug gap on the spark plugs to be installed. Compare the measurement to the gap specifications. Refer to Ignition System Specifications. Correct as necessary.




2. Install the spark plugs into the engine.

NOTE: Refer to Component Fastener Tightening Notice in Service Precautions.

IMPORTANT: Always use the reinstallation torque specification when installing NEW or USED spark plugs into a USED cylinder head. Use the initial installation torque specification ONLY when installing spark plugs into a NEW cylinder head that has NOT gone through a normal engine thermal cycle.

2.1. Use this reinstallation torque specification when installing NEW or USED spark plugs into a cylinder head that has gone through a normal engine thermal cycle.

Tighten
Tighten the spark plug to 15 N.m (11 lb ft).

2.2. Use this initial installation torque specification ONLY when installing spark plugs into a NEW cylinder head that has NOT gone through a normal engine thermal cycle.

Tighten
Tighten the spark plug to 27 N.m (20 lb ft).

3. Connect the spark plug wires to the spark plugs.
4. Install the fuel injector sight shield.