Inspection and Repair: Notes
The spark plug affects entire engine performance and therefore its inspection is very important.
- Check electrode and insulator for presence of cracks, and replace if any.
- Check electrode for wear, and replace if necessary.
- Check gasket for damage, and replace if necessary.
- Measure insulation resistance with an ohmmeter, and replace if faulty.
- Adjust spark plug gap to 1.05 mm (0.04 in).
NOTE:
- Do not adjust the spark plugs gap without new spark plugs.
- Do not damage to tip of spark plugs.
- Do not cleaning the spark plugs. If require the cleaning it due to heavy dirt, it is allowed only 20 seconds to be used spark plug cleaner.
- Check fuel and electrical systems if spark plug is extremely dirty.
- Use spark plugs having low heat value (hot type plug) if fuel and electrical systems are normal.
- Use spark plugs having high heat value (cold type plug) if insulator and electrode are extremely burned.