Inspection
INSPECTIONINSPECT SPARK PLUG
NOTE:
- Do not use a wire brush for cleaning.
- Do not attempt to adjust the electrode gap of a used spark plug.
a. Check the electrode.
1. Using a mega ohmmeter, measure the insulation resistance.
Correct insulation resistance: 10 MOhms or higher
If the resistance is less then the specified value, proceed to step (b).
HINT: If a mega ohmmeter is not available, perform the following simple inspection instead.
b. Alternative inspection method:
1. Quickly accelerate the engine to 4,000 rpm 5 times.
2. Remove the spark plug.
3. Visually check the spark plug.
4. Reinstall the spark plug.
c. Check the spark plug for any damage to its threads and insulator.
If there is any damage, replace the spark plug.
d. Check the spark plug electrode gap.
Maximum electrode gap for used spark plug: 1.3 mm (0.051 in.)
If the gap is greater than the maximum, replace the spark plug.
Correct electrode gap for new spark plug: 1.0 to 1.1 mm (0.039 to 0.043 in.)
e. Clean the spark plugs.
If the electrode has traces of wet carbon, clean the electrode with a spark plug cleaner and then dry it.
Air pressure: Blow 588 kPa (6 kgf/sq.cm, 85 psi)
Duration: 20 seconds or less
HINT: If there are traces of oil, remove them with gasoline before using the spark plug cleaner.