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Some practical advice for choice candles and to their service

Install new spark after a short run (about 1,000 km), it is advisable to unscrew them by marking the number of the cylinder, and carefully inspect the condition of insulators. With a correctly heat range and the optimal composition of the mixture and ignition timing angle of the insulator is light brown, brown or light gray.

Multi-colored deposits on the insulator and electrodes indicate the presence of fuel or engine oil a large number of additives. Black, matte finish carbon deposits on the insulator, the electrodes and the body - a sign of work in most modes on pereobogaschenie mixture or too high a heat rating. It is necessary to check the adjustment of the carburetor or fuel injection system (eg for gas analyzer) or install a hot candle. Shiny black soot indicates contact with the cylinder lubrication through piston rings and valve guides. Requires repair of the engine.

If the insulator "snow-white" color - hence, the candle worked on the maximum permissible thermal conditions. The reasons: too earlier ignition repauperization mix or too "hot" candle for the engine. It is necessary to check the carburetor adjustment, ignition timing characteristics of the machine and, if they are OK, put a "cold" spark plug. Well, the next degree of overheating candles - candles melted electrodes (well, not Burned piston crown).

Sometimes it may be that all the candles of the same brand in different cylinders have insulators different in color. The reasons can be several. Typically, gasoline engines mixture (composition) and anti-knock additive in the cylinders evenly distributed.

There are motors with different values of compression ratio for each of the cylinders. Well, between the engines of the same model is sometimes different compression ratio for the whole unit. Due to departures from processes, materials, and others. Among the candles of the same brand as there is a large variation in the actual heat rating. When a large difference in the condition of the spark sometimes have even installed one engine candles with different heat range. To always have a supply of heat rating in different operating conditions, it is advisable to have two sets of candles and set the summer a "cold" winter "hot".

Recently, a number of companies produce candles with advanced thermal field candles. For this, the central electrode is made of copper, is coated on top of the heat-resistant material (nickel, chromium). Sometimes the side electrodes are made of metal with good thermal conductivity and heat resistant coating. Other original decision is manufacturing miniature platinum center electrode, does not protrude from the insulator. Especially "cold" spark a heat range of 300 and above for uprated engines (with turbonadduovm, stroke, etc.) Are usually made with a silver electrode of small diameter and a short skirt insulator. Before setting such candles, sometimes it is recommended to warm up the engine on hot candlelight and then install the cold.

It must be borne in mind that in the purification of the candles in the sandblasted surface of the insulator is destroyed. It is better, turning a candle, pour into the body, the solvent, benzene, or apply a special spray can. Then a wooden stick to clear an insulator and blow it with compressed air.