Broken, Cracked or Chipped Insulator

Chipped Electrode Insulator:

NOTE: Replace any spark plugs which have cracked broken or chipped insulators.

Symptoms: Insulator chipped or broken.

Possible Causes:
- Usually results from bending the center electrode while adjusting the spark plug electrode gap.
- Severe detonation also can separate the insulator from the center electrode.
- Sudden Rise In Tip Temperature.
- Severe Operating Conditions.
- Improper Gapping Of Plugs.