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Replacing spark plugs
The components of the spark and ignition coils
 | Spark plugs should be replaced only by a cold or slightly warm engine. Screwing out candles on a hot engine can cause damage to the threads in the cylinder head. |
| - Turn off the ignition and remove the air intake hose with the air cleaner housing (see chap. Power supply system and exhaust).
- Disconnect the electrical wiring of the ignition coil, unscrew the retaining bolt and remove the coil from the spark plug.
- Remove the spark plug with a long socket wrench 16 mm, taking care not to tilt it.
- Assess the spark plug (see. Illustration below). If necessary, correct any problems, which can be seen as suppositories. Carbon deposition on the electrodes can be removed by compressed air pressure of 588 kPa for 20 s, no use for this purpose a wire brush. Check and adjust the electrode gap in the intervals between replacement of candles is not required.
- Under normal circumstances, should be set the standard spark plug. "Hot" candles should be placed, if the standard candles contaminated under such conditions as frequent engine start and low temperature. "Cold" candles should be placed, if the standard candles cause detonation under conditions such as the duration of the movement at high speed and frequent operation of the engine at high speeds.
- Install new spark plugs and tighten them with a force of 19.6 ÷ 29.4 N ??? m.
- Further installation in reverse order. Ignition coils bolts tightened to 3.8 ÷ 4.4 N ??? m.
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Coal deposits  | Symptoms: The presence of soot indicates pereobogaschenie air-fuel mixture or low intensity spark. It causes misfiring complicates start and leads to instability of the engine.
Recommendation: Check whether the air cleaner is not blocked is not too high fuel level in the float chamber, if not jammed choke and not too worn contacts. Try to use candles with longer insulator that raises resistance to contamination.
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Oiling  | Symptoms: oily contamination spark causes wear stem seals. The oil enters the combustion chamber through the valve guides or worn piston ring. It causes misfiring complicates start and leads to instability of the engine.
Recommendation: Perform mechanical recovery work and replace candles.
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Overheat  | Symptoms: Porous, white insulator, erosion of electrodes and the absence of any deposits. It leads to a reduction in the life of the candle.
Recommendation: Check whether the requirements of the Specifications glow of candles set the number is correctly exposed ignition timing is not served there too lean air-fuel mixture leaks vacuum inlet pipeline and whether valves are jammed. Check the coolant level as well, and blockage in the radiator.
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Too early ignition  |
Symptoms: Electrodes are melted. The insulator is white, but may be contaminated due to a misfire, or falling into the combustion chamber of foreign particles. It may lead to engine damage.
Recommendation: Check the number of installed glow of candles, the ignition timing, the quality of the mixture (not too depleted), blockage in the cooling system is functioning normally and the lubrication system.
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Electrically conductive gloss  | Symptoms: Insulator has yellowish color and the polished look. It speaks about sudden rise in temperature in the combustion chambers at sharp acceleration. Ordinary deposits while melted, getting kind of lacquer. It leads to misfire at high speeds.
Recommendations: Change candles (colder, while maintaining the driving style).
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The closure of the electrodes  | Symptoms: Waste combustion products enter the inter-electrode space. Solid deposits accumulate, forming a bridge between the electrodes. Leads to failure of the ignition cylinder.
Recommendation: Remove deposits from the electrode area. |
The normal state of candles  | Symptoms: Gray-brown color and easy deterioration of electrodes. Heat range spark for the type of engine and its general condition.
Recommendations: At replacement of candles set the candles of the same type. |
Peploobrazovanie  | Symptoms: Soft brownish deposits on one or both of the spark plug electrodes. The source of their formation are applied additives to oil and / or fuel. Excessive accumulation can lead to isolation of the electrodes and cause misfiring and unstable engine performance during acceleration.
Recommendation: With the rapid accumulation of sediment change stem seals that will prevent oil from entering the combustion chamber. Try to change the brand of fuel. |
Wear  | Symptoms: Rounding electrodes with a small accumulation of deposits on the working end. Color normal. It leads to difficulty starting the engine in cold damp weather and increased fuel consumption.
Recommendations: Change candles on new, the same type. |
Detonation  | Symptoms: Insulators can be cleaved or cracked. It can cause damage to the insulator as sloppy technique adjustment of a candle backlash. It can cause damage to the pistons. |
Splashing  | Symptoms: After misfire for a long period of time deposits can disintegrating maintaining the operating temperature in the combustion chamber. At high speeds of deposition flakes come off the piston and stick to a hot insulator, causing misfiring.
Recommendations: Replace candles or smooth out and replace the old ones. |
Mechanical damage  | Symptoms may be caused by the ingress of foreign material into the combustion chamber, or occur when the piston stroke about too long candle. Lead to refusal of functioning of the cylinder and piston damage.
Recommendation: Remove from the engine extraneous particles and / or replace the spark. |
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