To complete the job, you will need a special 21 mm spark plug socket wrench.
It is convenient to replace the spark plugs one by one.
Sequence of execution
1. Remove the high-voltage wire from the spark plug of the first cylinder (see "High Voltage Wires - Checking and Replacing").
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. Using a 21 mm spark plug socket wrench, unscrew the spark plug.
4. Before installing the spark plug, use a set of round feeler gauges to check the gap between its electrodes (see "Spark plugs - replacement"). 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 tightening torque of the spark plug is 30-40 Nm.
6. Screw the spark plug into the cylinder head.
7. Replace the spark plugs of the remaining cylinders in the same way.