Spark Plug: Service and Repair

CAUTION: Failure to route the cables properly could cause the radio to reproduce ignition noise, cross ignition of the spark plugs or short circuit the cables to ground.

CAUTION: Always remove the spark plug cable by grasping the top of the spark plug insulator, turning the boot 1/2 turn and pulling straight up in a steady motion.

SPARK PLUG REMOVAL
1. Remove the spark plug using a quality socket with a rubber or foam insert.
2. Inspect the spark plug condition.


SPARK PLUG CLEANING
Spark plugs that have low mileage may be cleaned using commercially available spark plug cleaning equipment. After cleaning, file the center electrode flat with a small point file or jewelers file before adjusting gap.

CAUTION: Never use a motorized wire wheel brush to clean the spark plugs. Metallic deposits will remain on the spark plug insulator and will cause plug misfire.

CAUTION: Always tighten spark plugs to the specified torque. Over tightening can cause distortion and change the spark plug gap.

SPARK PLUG INSTALLATION
1. To avoid cross threading, start the spark plug into the cylinder head by hand.
2. Tighten spark plugs to 28 Nm (20 ft lb) torque.
3. Install spark plug insulators over spark plugs. Ensure the top of the spark plug insulator covers the upper end of the spark plug tube.
4. Connect coil.

SPARK PLUG TUBES
The spark plugs tubes are pressed into the cylinder head. Sealant is applied to the end of the tube before installation.