SPARK PLUG CHECK AND CLEANING


caution
  • Never attempt to adjust the gap of the platinum plug or the iridium plug.
  • Do not attempt to clean the spark plug because it may result in damage to the electrode. However, if remarkable carbon deposits must be removed, using a sand blast type plug cleaner, complete the cleaning within 20 seconds to protect the electrode. Do not use a wire brush.
note Obey the maintenance interval of the relevant vehicle for the spark plug replacement. If the plug gap and insulation resistance are normal, check the plug state and clean it if necessary.

SPARK PLUG GAP CHECK

Check the plug gap with the wire type plug gap gauge. Replace it if the limit is exceeded.
Standard value, limit:

<4B1>
Manufacturer
 Type
 Standard value (mm)
 Limit (mm)
NGK
 FR5EI
 0.7 - 0.8
 1.2
DENSO
 K16PSR-B8
 0.7 - 0.8
 1.2

<6B3>
Manufacturer
 Type
 Standard value (mm)
 Limit (mm)
NGK
 ILKR7B8
 0.7 - 0.8
 0.95

SPARK PLUG INSULATION RESISTANCE CHECK

1.Measure the insulation resistance. If the insulation resistance of the spark plug is under the limited value, clean the plug within 20 seconds using a sand blast type plug cleaner.
2.After cleaning, measure the insulation resistance again. Replace the plug unless it is within the limited value.
Limit: Minimum 10 MΩ