Recommendation: Spark plugs should be replaced every 30,000 km, or when they fail, if the engine starts to idle unstably.
To perform the work you will need a special socket wrench for spark plugs by 21 mm.
Sequence of execution
1. Remove the high-voltage wire from the spark plug of the first cylinder (see above, "High voltage wires - checking and replacement").
2. Wipe with a rag and blow compressed air from a tire pump at the spark plug installation site (to prevent sand from getting into the cylinder after removing the spark plug).
3. With a spark plug socket wrench by 21 mm we turn away the candle.
Note: The condition of the spark plug can be used to assess the technical condition of the engine and its systems. In a serviceable engine, the spark plug insulator should have a gray or brownish coating. Red or orange coating is caused by operating the car on gasoline with a high additive content. Black oily coating can be caused by oil penetrating the combustion chamber. A spark plug with a heat rating lower than recommended may cause electrode burnout. Similar damage to the spark plug may be caused by a malfunction of the cooling system or ignition system. Large deposits on the spark plug may be caused by poor-quality gasoline or oil.
4. Before installing the spark plug, use a set of round feeler gauges to check the gap between its electrodes. The gap should be 1.0-1.1 mm.
Note: When checking the gap with flat feeler gauges, the measurement results will be incorrect.
5. Adjust the gap by bending the side electrode.
Warning! To avoid damaging the threads in the cylinder head, first tighten the spark plug by hand and then tighten it by inserting the handle into the wrench extension. The spark plug tightening torque is 30-40 Nm.
6. Screw the spark plug into the cylinder head and put the high-voltage wire tip on it.
7. Replace the spark plugs of the remaining cylinders in the same way.