Spark Plug: Testing and Inspection

PROCEDURE

CAUTION: Never use a wire brush for cleaning. Never attempt to adjust the electrode gap on a used spark plug. Spark plugs should be replaced every 100,000 km (60,000 miles).





1. Remove ignition Coils.





2. Inspect electrode; using a megger (insulation resistance meter), measure the insulation resistance.

Insulation resistance: 10 M ohms or more

If the resistance is less than specified, proceed to step 3.





3. Remove Spark Plugs; using a 16 mm plug wrench, remove the Spark Plug.
4. Visually Inspect Spark Plugs.

- Check the Spark Plug for thread damage and insulator damage.
- If abnormal. replace the Spark Plug.

Recommended Spark Plug:
GPK20R11 for ND
BKR6EP-11 for NGK





5. Inspect electrode gap.
- If the gap is greater than maximum. replace the Spark Plug.

Maximum electrode gap: 1.3 mm (0.051 in)

- Correct electrode gap of new Spark Plug.

Gap: 1.1 mm (0.043 in)

NOTE: If adjusting the gap of a new spark plug, bend only the base of the ground electrode. Do not touch the tip. Never attempt to adjust the gap on the used plug.

6. Clean Spark Plugs





- If the electrode has traces of wet carbon, allow it to dry and then clean with a Spark Plug cleaner.

Air pressure: Below 588 kPa (85 psi).
Duration: 20 seconds or less.

NOTE: If there are traces of oil, remove it with gasoline before using the spark plug cleaner.

7. Install Spark Plugs





- Using a 16 mm plug wrench, install the Spark Plug.

Torque: 18 Nm (13 ft lb)

8. Reinstall Ignition Coils.