Spark plug

Spark plug gap

Checking the spark plug gap with a template

Before removing the spark plugs, remove dirt using a clean brush, vacuum cleaner or compressed air, which prevents dirt from entering the engine cylinders.

1. Remove the tips of the high-voltage wires from the spark plugs, and it is necessary to remove them by the tip, and not by the wire.

2. Unscrew the spark plugs.

3. Checking the spark plugs shows the condition of the engine. If the nose of the spark plug insulator is clean and white, this indicates that the mixture is too lean or "hot " spark plug.

4. If the tip and nose of the insulator are covered with a hard black coating, this indicates that the mixture is too rich. If it's black and oily, it's likely that the engine is worn out.


5. If the nose of the insulator has a slight light brown coating, then the mixture is optimal and the engine is likely to be in good condition.



6. Check spark plug gap with a feeler gauge.

7. The gap between the electrodes of a spark plug is important, because if the gap is too large or too small, the ignition spark size and efficiency will not be sufficient for normal engine operation.

8. To set the interelectrode gap, bend the outer electrode until the required gap is obtained. Never bend the center electrode, as this could crack the insulator.

9. Thoroughly wipe the threaded part of the candle and grease with a non-stick compound.

10. Screw in the spark plug by hand, making sure it is not skewed, and tighten to the required torque. Spark plug tightening torques:

• OHC engine - 25 Nm;
• DOHC engine - 20 Nm;
• V6 engine 2.9 - 40 Nm;
• V6 engine 2.4 - 30 Nm.

11. Install the tips of high-voltage wires on the candles and check the reliability of their installation.