2.3.3.8. Replacement of spark plugs (SOHC engines)
The correct functioning of spark plugs – one of the most important conditions of effective operation of the engine. It is necessary that on the engine spark plugs only the ordered type were established. At the serviceable engine cleaning of spark plugs – rare operation.
Tools necessary for a vyvinchivaniye of a spark plug and correction of an interelectrode gap
Measurement of a gap of a spark plug wire template
Measurement of a gap of a spark plug probe
Vyvinchivany spark plugs
| PERFORMANCE ORDER |
| 1. Mark high-voltage wires in figures from 1 to 4 (the 1st cylinder is located from a gear belt) and remove high-voltage wires from spark plugs. |
| 2. Clear candles, using a brush, the vacuum cleaner or a stream of compressed air that will exclude hit of dirt in engine cylinders after a vyvinchivaniye of spark plugs. Unscrew candles, using a candle key (see fig. Vyvinchivany spark plugs). |
| 3. Visual control of a working part of spark plugs can show a condition of the engine. If the nasal part of the isolation center of spark plugs pure and white, without raid, then it testifies to too poor mix. It also specifies that a candle too hot, that is heat from the central electrode is taken away slowly. If this is so, then it is necessary to adjust composition of fuel mix or to replace a candle. |
| 4. If the nasal part of the isolation center is covered with a black raid, then it means that mix too rich. If the raid black and oily, then it testifies to wear of the engine and need of its check and repair. If the nasal part of the isolation center is covered with a light brown raid, then the composition of mix is optimum and the engine is in good shape. |
| 5. The interelectrode gap of a spark plug is of great importance as at too big and at too small gap the spark size changes that leads to decrease in overall performance of the engine. The gap has to conform to technical requirements always. Check of a gap is carried out by a wire template or the probe (see rice. Measurement of a gap of a spark plug wire template, Measurement of a gap of a spark plug probe). Korrektirov of a gap is carried out by a podgibaniye of a side electrode. The central electrode cannot be bent at all as it can lead to breakage of the insulator and an exit of a candle out of operation. |
| 6. For a podgibaniye of a side electrode of a candle it is necessary to use the special tool. |
| 7. Before installation of a spark plug in the engine, check that the carving was pure and all threads of a carving whole. |
| 8. Screw in spark plugs by hand and then tighten them the required moment. |
| 9. Connect high-voltage wires to spark plugs. |
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