Spark Plug: Service and Repair

SPARK PLUG CHECK AND CLEANING
1. Remove the engine cover and intake manifold plenum.
2. Remove the spark plug cables.

CAUTION: When pulling off the spark plug cable from the plug always hold the cable cap, not the cable.

3. Remove the spark plugs.
4. Check for a burned out electrode or damaged insulator. Check for even burning.
5. Remove carbon deposits with a plug cleaner. Remove sand from the plug threads with compressed air.

CAUTION: Cleaning a platinum spark plug may damage the platinum tip. If carbon deposits must be removed use a plug cleaner and complete cleaning within 20 seconds. Do not use a wire brush.




6. Use a plug gap gauge to check that the plug gap is within the standard value range. Replace the spark plug if the limit is exceeded.

Standard value: 1.0 - 1.1 mm (0.039 - 0.043 in.)

7. Clean the engine plug holes.

CAUTION: Use care not to allow foreign matter in cylinders.

8. Install the spark plugs.



SPARK PLUGS (Replace)
1. Spark plugs must spark properly to assure proper engine performance and reduce exhaust emission level.
Therefore, they should be replaced periodically with new ones.
2. The new plugs should be checked for the proper gap.
Spark plug gap: 1.0 - 1.1 mm (.039 - .043 in.)
3. Install the spark plug and tighten to 20 - 30 Nm (15 - 21 ft.lbs.)