Spark Plug: Testing and Inspection

SPARK PLUGS INSPECTION

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

1. REMOVE IGNITION COILS ASSEMBLIES
2. INSPECT ELECTRODE





- Using a megger (insulation resistance meter), measure the insulation resistance.

Standard correct insulation resistance: 10 M Ohms or more

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

HINT: If a megger is not available, the following simple method of inspection provides fairly accurate results.

Simple Method:
- Quickly race the engine 5 times to 4,000 rpm.
- Remove the spark plug.





- Visually check the spark plug.
- If the electrode is dry ... OK
- If the electrode is wet ... Proceed to step 4
- Reinstall the spark plug.

3. REMOVE SPARK PLUGS
4. VISUALLY INSPECT SPARK PLUGS
- Check the spark plug for thread damage and insulator damage.
- If abnormal, replace the spark plug.

Recommended spark plug:
ND
PK20R11
NGK
BKR6EP11





5. INSPECT ELECTRODE GAP

Maximum electrode gap for used spark plug:
1.3 mm (0.051 in.)

Correct electrode gap for new spark plug:
1.1 mm (0.043 in.)

NOTICE:
- 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 (6 kgf/sq.cm, 85 psi)
Duration: 20 seconds or less

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

7. REINSTALL SPARK PLUGS

Torque: 18 N.m (180 kgf.cm, 13 ft.lbf)

8. REINSTALL IGNITION COILS ASSEMBLIES