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5-3-3-svechi-zazhiganiya.html
5.3.3. Spark plugsIf faults in ignition, especially in one or several cylinders are noticed, it is necessary to check up a condition of candles.
Preliminary check
| PERFORMANCE ORDER |
| 1. Before test of a spark plug with a deposit or polluted clear on special installation by a stream of sand and blow compressed air. |
| 2. If the deposit of light brown colour it can to be deleted as it appears on the serviceable engine and does not break work of system of ignition. |
| 3. After clearing examine candles and adjust a backlash between electrodes. If on a candle insulator are available сколы, cracks or it is damaged приварка a lateral electrode a candle replace. |
| 4. A backlash (0,5–0,6 mm) between candle electrodes check round wire щупом. To check a backlash flat щупом it is impossible, as dredging on a lateral electrode which is formed at candle work thus is not considered. A backlash regulate подгибанием only a lateral electrode of a candle. |
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Test for tightness
| PERFORMANCE ORDER |
| 1. Screw a candle in a corresponding nest at the stand, and then create in the chamber of the stand pressure 2 МПа (20 kgs/sm2). |
| 2. Drop from a butterdish on a candle some drops of oil or kerosene; if tightness is broken, there will be air vials, usually between an insulator and the candle case. |
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Electric test
| PERFORMANCE ORDER |
| 1. Having adjusted a backlash between electrodes of a candle to 0,6 mm, screw it in a nest at the stand and tighten динамометрическим a key the moment 31–39 Н·м (3,2–4 кгс·м). Tightness is provided with an elastic lining of the union of a nest. |
| 2. Establish a tip of a wire of a high voltage on a candle and submit on it high voltage impulses. |
| 3. Thus the following can be observed. |
| 4. In a stand eyepiece the high-grade spark between candle electrodes is observed; in this case the candle is considered excellent. |
| 5. Искрение occurs between rated sportsman electrodes; it is necessary to lower pressure in the device and to check up, at what pressure comes искрообразование between candle electrodes. If it begins at pressure more low 0,3 МПа (3 kgs/sm2), a candle defective. |
| 6. It is supposed a little искрений on a rated sportsman. If искрообразование is absent on a candle and on a rated sportsman probably that on a candle insulator there are cracks and that the category occurs inside, between weight and electrodes. Such candle выбраковывается. |
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