Blow the spark plug socket with compressed air from a compressor or pump to remove contaminants.
We change the candles in turn, so as not to confuse the order of connecting the wires.
Remove the tip of the candle.
With a candle wrench from a set or a special head «at 21» turn off the candle.
Before installing a new candle, check the gap between its electrodes (see Adjusting the gap between the electrodes of the spark plug) and make sure the sealing washer is in place and not deformed. Wrap the candle first «by hand», then tighten with a wrench (see Applications).