Removal and Installation

Removal Procedure




1. Remove the spark plug wires. Refer to Spark Plug Wire Harness Replacement.
2. Loosen each spark plug one or two turns. Most spark plug are best removed from wheel wells.
3. Brush or air blast away any dirt from around the spark plugs.
4. Remove the spark plugs one at a time and place each plug in a tray marked with the corresponding cylinder numbers.

Installation Procedure






NOTE: If the boot to wire movement has occurred, the boot will give a false visual impression of being fully seated. Ensure that the boots have been properly assembled by pushing sideways on the installed boots. Failure to properly seat the terminal onto the spark plug will lead to wire core erosion and result in an engine misfire or crossfire condition, and possible internal damage to the engine.

1. Properly position each spark plug washer.

NOTE: Refer to Fastener Note in Service Precautions.

2. Inspect each spark plug gap. Adjust each plug as needed.

Specification
Spark plug gap: 1.524 mm (0.060 in).

Tighten
For (IRON Head-all Subsequent Installations) tighten the spark plugs to 15 N.m (11 lb ft).
For new iron heads tighten the spark plugs to 30 N.m (22 lb ft).

3. Install the spark plug wires. Refer to Spark Plug Wire Harness Replacement.