Spark Plug: Testing and Inspection
INSPECTION OF SPARK PLUGSCAUTION:
- Never use a wire brush for cleaning.
- Never attempt to adjust the electrode gap on used spark plug.
- Spark plug should be replaced every 100,000 km (60,000 miles).
1. REMOVE INTERCOOLER
2. INSPECT ELECTRODE
A. If using a megger (insulation resistance meter):
Measure the insulation resistance.
Correct insulation resistance: 10 M ohms or more
If the resistance is less than specified, proceed to step 3.
B. If not using a megger:
(a) Quickly race the engine to 4,000 rpm five times.
(b) Remove the spark plug.
(c) Visually check the spark plug.
If the electrode is dry .... OK
If the electrode is wet .... Proceed to step 3
3. REMOVE SPARK PLUGS
Using a plug wrench (16 mm), remove the spark plug.
4. VISUALLY INSPECT SPARK PLUGS
Check the spark plug for thread or insulation damage. If abnormal, replace the spark plug.
Recommended spark plug:
ND PQ16R8
NGK BCPR5EP8
5. INSPECT ELECTRODE GAP
Maximum electrode gap: 1.0 mm (0.039 in.)
If the gap is greater than maximum, replace the spark plug.
Correct electrode gap of new spark plug: 0.8 mm (0.031 in.)
If adjusting the gap of a new spark plug, bend only the base of the ground electrode. Do not touch the tip.
6. CLEAN SPARK PLUGS
If the electrode has traces of wet carbon, allow it to dry and then clean with a spark plug cleaner.
7. INSTALL SPARK PLUGS
Using a plug wrench (16 mm), install the spark plug.
Torque: 180 kg-cm (13 ft-lb, 18 N m)
8. INSTALL INTERCOOLER