Removal
Disconnect the spark plug tips. Do this by pulling the tip, not the wire.
Remove the spark plugs using a wrench of the appropriate size.
Examination
Check the working part of the spark plugs. With some experience, this check can be used to draw a conclusion about the engine condition.
Electrodes and insulation:
- gray - correct operation of candles;
- black - too rich fuel mixture;
- light gray - too lean fuel mixture;
- oily - spark plug malfunctions or piston ring wear
Clean the spark plugs with a brass brush or sandblasting machine.
Check the spark plug insulation for breakdown. The presence of leakage currents can be identified by thin, uneven marks on the surface of the housing. If these marks cannot be completely removed, the spark plug must be replaced.
Check the distance between the electrodes with a feeler gauge. It should be 0.7-0.8 mm.
Original source on the website Opelbook.ru
To adjust the distance between the electrodes, bend the side electrode by tapping it from the side with a suitable steel object. You can also use a small screwdriver, resting it on the edge of the threaded surface.
Attention! Do not bend or lean on the central electrode, as this will cause the spark plug to break!
Installation
Clean the threads on the spark plugs and the threaded holes in the cylinder head.
Screw the spark plugs into the cylinder head by hand until they stop.
Attention! Do not tilt the candles!
Tighten the spark plugs to a torque of 25 Nm. Caution! If you do not have a torque wrench at hand, tighten new spark plugs with a flat sealing surface at an angle of approximately 90°, and spark plugs with a conical sealing surface at an angle of approximately 15°. Tighten used spark plugs with a flat sealing surface at the same angle. If the spark plugs are tightened too much, the threads on them or in the cylinder head can be stripped when unscrewing. In this case, it is necessary to restore the threads using special inserts (UTC or Heli-Coil).
Place the spark plug caps on the spark plugs in the correct order for the cylinders to fire. The first cylinder is on the right side of the engine, looking in the direction of travel.
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