Examining any candle, first of all pay attention to a deposit. The deposit — is the good conductor therefore it is at the bottom of leakage of a current in a candle. The leak current at a new candle is very small and practically does not influence work of system of ignition. At candle operation the thickness of a deposit increases, resistance decreases, and the current of leak increases. With growth of a current of leak tension between spark plug electrodes decreases. As a result there comes such moment when the candle ceases to work.

Formation of a deposit on a candle insulator — the phenomenon inevitable. However, having found a deposit, do not hurry up to clear it. At first pay attention to its thickness and color. If the candle is covered with a thin layer of a deposit from gray and yellow to light brown color, it is possible not to delete it, as it practically does not influence work of system of ignition. But if the thickness of a layer of a deposit is great or it dark color, such candle needs to be cleared.

It is possible to determine by appearance of spark plugs, whether normally works candles, whether they are suitable for this engine, whether the system of injection, what condition of a working mix and an engine condition (the piston, piston rings and so on) well works.

Thus it is necessary to be guided by the following rules.

The candle looks faultlessly

The thermal cone of an insulator is covered with a lung, in most cases a poroshkoobrazny raid from gray and yellow to the brown. Electrodes have depending on a scale surface from gray and yellow to brown a poroshkoobrazny raid. The internal part of the case has light brown or yellowish to a black-brown raid.

In this case engine as it should be. Warmth of combustion of candles is chosen correctly.

The candle is covered with a soot

The thermal cone of an insulator, electrodes and internal surface of the case in most cases have a thick poroshkoobrazny, black-gray velvety raid.

The reason of it is too saturated working mix, a lack of air, too big distance between electrodes, the candle has too high warmth of combustion and remains too cold during operation of the engine. As a solution it is possible to suggest to insert a candle with other warmth of combustion.

The candle is greasy

The thermal cone of an insulator, electrodes and the case of a candle are covered with oily, brilliant soot (formation of an oil deposit). The engine oil which has got to the chamber of combustion or worn-out cylinders and pistons can be the reason of it.

The candle overheats

The thermal cone of an insulator is covered dark brown to gray-black, the steklovidny or rigid baked raid. In most cases on the end of a thermal cone of an insulator thick and steklovidny educations are had. Electrodes, especially central, have traces of aggressive influence. A surface in most cases rough, bulked up or corroded.

The grown poor working mix, badly tightened candle, badly being closed valves or candle with too low warmth of combustion which at operation of the engine overheats can be the reason.

Clear deposits between a porcelain insulator of the central electrode and the candle case, whenever possible, by means of the peskostruyny device. Before wrapping a candle carefully clean its carving. By all means pay attention to the inhaling moment (25 or 30 N · м).