Spark Plug: Service and Repair

Spark Plug Replacement

Removal Procedure

1. Remove the spark plug wires. Refer to Spark Plug Wire Replacement Service and Repair.




2. Loosen each spark plug 1 or 2 turns.

3. Brush or air blast away any dirt from around the spark plugs.

4. Remove the spark plugs one at a time. Place each plug in a tray marked with the corresponding cylinder numbers.

Installation Procedure





Note: The spark plug comes pre-gapped. Do not change the spark plug gap from 1.01 mm (0.040 in).

1. Inspect each spark plug gap. Adjust each plug as needed. Refer to Ignition System Specifications [1][2]Specifications.

2. Hand start the spark plugs in the corresponding cylinders.

Caution: Refer to Fastener Caution Fastener Caution.

3. Tighten the spark plugs for used heads to 15 Nm (11 lb ft). Tighten the spark plugs for new aluminum heads to 20 Nm (15 lb ft). Tighten the spark plugs for new iron heads to 30 Nm (22 lb ft).

4. Install the spark plug wires. Refer to Spark Plug Wire Replacement Service and Repair.