2. To replace, first of all, remove the top cover of the engine and, not for ADR, AFY, APT, AEB and AJL engines, remove the coil (ki) ignition, as described in chapter 5B. If marks (digitization) not visible on high-voltage wires, apply them in accordance with the numbering of the cylinders (Cylinder #1 is on the timing belt side). Remove the wires from the spark plugs by pulling on the protective caps, but not on the wire itself, as this can easily damage it.
3. It is recommended that before removing the candles, clean the dirt around with a brush, vacuum cleaner or compressed air so that dirt does not get into the cylinders.
4. Unscrew the spark plugs using a spark plug wrench or a tall socket with an extension and a knob (pic. 26.4). Keep the head aligned with the candle; when warping, it is easy to break the ceramic insulator. After removing the candles, check them as follows.
5. The condition of the candles can tell a lot about the condition of the engine. In the event that the insulating tip of the center electrode is clean and white, this indicates that the mixture is too lean or the candle is too "hot" ("hot" the candle does not remove heat well from the insulator, and "cold" - fast).
6. If the insulating tip is covered with black soot, this may indicate a mixture that is too rich.
7. If the insulating tip is covered with deposits from brown to gray, this indicates a good condition of the engine, its power supply and ignition system.
8. If the candles have not yet exhausted their prescribed resource, they can be installed again, but the gap between the electrodes must be checked, since during normal operation it gradually (0.025 mm per 1500 km) increases. If, due to the condition of the engine, the candles have become unusable. they are replaced. The size of the gap between the electrodes of the spark plugs is very important, if it is not as prescribed, sparking can be seriously impaired. Check the gaps against the prescribed specifications at the beginning of this chapter. For multi-electrode spark plugs, the interelectrode gap is not adjustable; faulty multi-electrode spark plugs must be replaced.
9. To adjust the gap, measure it with a flat feeler gauge. Adjust the gap by bending the outer electrode (pic. 26.9, a, b). Never try to bend the central electrode, its insulator is easy to break, after which the candle will only have to be thrown away.
10. Automotive parts stores can buy tools to measure and adjust the gap (pic. 26.10).
11. Before installing the candles, make sure that the threaded tips are screwed tightly, the outer surface of the insulator and the threads are clean. When installing new candles, it can be difficult to align the threads - use a rubber hose.
12. Remove the rubber hose. Tighten the spark plugs to the prescribed torque using the tall socket and torque wrench (pic. 26.12).
13. Attach high voltage wires. If necessary, install the coil (ki) ignition as described in chapter 5B.
14. Install the engine top cover.
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