To complete the work you will need: a special 16 mm spark plug socket wrench with an extension. The head of the key should have a rubber sleeve installed that holds the spark plug.
Remove the ignition coil of the first cylinder (see "Ignition Coil - Checking and Replacing").
Using a 16 mm spark plug socket wrench, unscrew the spark plug and remove it from its socket.
3. Remove the spark plug from the key head.
Note: The technical condition of the engine and its systems can be assessed by the appearance of the spark plug. In a serviceable engine, the spark plug insulator should have a grey or brownish coating.
Red or rusty plaque is caused by using a vehicle on gasoline with a high additive content.
Black oily deposits may be caused by oil entering the combustion chamber. A similar defect will occur with a spark plug if it is "colder" than recommended.
If the spark plug is "hotter" than recommended, the electrodes may burn out. Similar damage to the spark plug can be caused by a faulty cooling system or ignition system.
Large deposits on the spark plug may be caused by poor quality gasoline or oil.
Adjustment
4. Before installing the spark plug, use a set of round feeler gauges to check the gap between its electrodes. The gap should be 1.0-1.15 mm.
Warning! When checking the gap with flat feeler gauges, the measurement results will be incorrect.
5. Adjust the gap by bending the side electrode.
Installation
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. Spark plug tightening torque 30-40 Nm.
We insert the spark plug into the key head and screw it into the cylinder head.
We replace the spark plugs of the remaining cylinders in the same way.