Spark Plug: Service and Repair

Spark Plug Wire Routing:

TOOL REQUIRED:
J 38491 Spark Plug Heat Shield Removal Tool

REMOVE OR DISCONNECT
1. Ignition key OFF.
2. Plug wires from spark plugs.
a. Note position of wires BEFORE removing.
b. Twist the boot 1/2 turn BEFORE removing.
c. Using J 38491, gently pry heat shield up from spark plugs (right near cylinders ONLY).
3. Spark plug(s) from engine.

NOTE: It is important to check the gap of all new and reconditioned spark plugs before installation. Pre-set gaps may have changed during handling. Use a round wire feeler gauge to be sure of an accurate check, particularly on used plugs. Installing plugs with the wrong gap can cause poor engine performance and may even damage the engine.


ADJUST
Spark plug gap on plugs to 1.52 mm (0.060 inch).

INSTALL OR CONNECT

NOTE: 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 recommended torque specifications carefully. Over or under-tightening can also cause severe damage to engine or spark plug.

1. Spark plug(s) to engine. Tighten to 15 Nm (11 lb ft).
2. Plug wires to spark plugs.
a. To proper location noted when removed.
b. Make sure heat shield is seated against bump stop and lower tabs extend over hex on spark plugs (right rear cylinders ONLY).