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 1 at a time. Place each plug in a tray marked with the corresponding cylinder numbers.

Installation Procedure




1. Properly position each spark plug washer.
2. Inspect each spark plug gap. Adjust each plug as needed.

Spark plug gap: 1.524 mm (0.060 in)

Caution: Refer to Fastener Caution (Fastener Caution).

3. Hand start the spark plugs in the corresponding cylinders.
4. Tighten the spark plugs.

* For used heads tighten the spark plugs to 15 Nm (11 lb ft).
* For new aluminum heads tighten the spark plugs to 20 Nm (15 lb ft).
* For new iron heads, tighten the spark plugs to 30 Nm (22 lb ft).

5. Install the spark plug wires. Refer to Spark Plug Wire Replacement (Service and Repair).