How to Adjust Spark Plug Gap?
2 Answers
Methods for adjusting spark plug gap: 1. Clean debris and dust around the spark plug on the cylinder head, unscrew the spark plug with a special socket, and remove carbon deposits around the electrodes with fine sandpaper; 2. Use a special gauge and pliers to adjust the side electrode to check and adjust the spark plug gap, which is generally 0.6 to 0.7 mm; 3. When adjusting the gap, bend the side electrode instead of prying the center electrode to avoid damaging the insulator. The function of the spark plug is to discharge the pulsed high voltage sent by the high-voltage wire, break down the air between the two electrodes of the spark plug, and generate an electric spark to ignite the mixed gas in the cylinder.
Adjusting spark plug gaps isn't actually difficult, the key is to operate carefully. I usually check the vehicle manual first to find the standard gap value - typically around 0.8mm for new cars, while older vehicles may require over 1mm. Use a feeler gauge to measure the existing gap; it's perfect when the gauge slides through with slight resistance. Never use regular pliers to bend the electrode directly - I specifically bought a notched spark plug gap adjustment tool that gently clamps the side electrode for gradual bending. After adjustment, always recheck two or three times to ensure the electrode isn't bent or deformed. As a side note, if you find severe carbon buildup on the electrodes, it's better to just replace the spark plugs, as gap adjustment might cause electrical leakage or misfiring issues.
