Installation Procedure

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.

Gap the spark plugs to the specifications. Refer to Ignition System Specifications .

NOTE: 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.

Install the spark plugs to the engine.
Tighten: Tighten the spark plugs to 25 N.m (18 lb ft) .
Install the ignition coil(s). Refer to Ignition Coil(s) Replacement .