 | If the original spark after checking the status will be re-installed on the engine, they must be screwed in strictly previous cylinders, make the appropriate marking. |
1. In most cases, replacement of the spark plugs requires a special candle head (with elastic insert inside) complete with a ratchet drive and a set of extensions and drive key devices for checking and adjusting the inter-electrode gap. To disconnect the wires from the terminals BB liners spark plug is also available a special tool, although its use is not strictly necessary. Using a torque wrench will ensure proper tightening efforts candles.
2. The right thing to keep in-car set of replacement spark plugs with a properly adjusted electrode gap. When buying a new spark, take care to meet the requirements on the parameters of the engine of your car. The required information is given in the Specifications to this chapter, as well as on the label VECI, fastened under the hood (in the case of discrepancies preference should be given information VECI).
3. Proceed to the eversion of candles only after full cooling of the engine. In order not to waste time, use the pause to check the status of replacement set.
4. Electrode gap candles checked by introducing a corresponding feeler gauge and must meet the requirements specified on the label VECI (see. And Specifications). The probe should be a slight resistance to slip between the side and center electrodes candles. The adjustment of the gap can be made with the help of a special device, usually a member of the meter - bend properly ground electrode spark.  |  |
5. If the side electrode is not located just above the central, adjust its position accordingly. Make sure there are no cracks or other damage to the porcelain insulator candles. The presence of defects of any kind is unacceptable insulator.  | 6. On models 1993 and 1994 Vol. To avoid confusion in the assembly before removing the label the explosive spark plug wires. Disconnect BB wire from the spark plug of the first cylinder. Pull only the tip, and in any case not the cord! It would be wise to use a special tool. |
7. If you have at hand a source of compressed air, use it to remove debris from the engine spark plug niche (for this purpose better than a regular suit and a bicycle pump).  | When using compressed air do not forget to wear safety goggles! |
 | 8. Remove the spark plugs. | In order to avoid confusion with the connecting wires / coils are replacing each of the candles one by one. |
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9.
Check the Remove the spark from the identification card, the following, which will qualitatively assess the overall condition of the engine.
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. |
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. |
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. |
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. |
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 number of installed glow of candles, 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. |
Wear
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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. |
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. |
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. |
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). |
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. |
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. |
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 |
10. Before screwing the new candles, lightly it lubricates the threaded portion antiprihvatyvayuschim sealant. Loosely hand one of the new candles in a corresponding hole in the engine. Making sure that the candle is not skewed in the thread, tighten it with demanded effort (if at hand torque wrench). To facilitate the baiting candles pull on its tail length of flexible fuel hose. This eliminates the possibility of failure of the thread, because at the slightest biting hose starts simply rotate.
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11. On models 1993 and 1994 Vol. BB connection wires to the spark carried rotary translational movements of his tip - the latter must sit flat on the shank of the candles. Used on models of release since 1995 are equipped with customized spark plug coils own short spark plug wires, - When a plant the assembly tightly on his candle, turning it on the shank of the latter.
12. Repeat for the remaining spark plugs, performing all the actions in turn in order to avoid violation of the order of ignition. |
