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The coil is one of the automotive components that has undergone the most evolution in recent years. Adapted to new engine needs, the component has transformed, stopped depending on distributors and, today, it has static versions - with and without the need for cables - and individual versions - which can be top coil or pencil coil. A partner in the aftermarket and committed to training professionals in the sector, and NGK, ignition specialist, guides repairers on component care.
"The coils are responsible for transforming the voltage of the vehicle's power supply system into high voltage", explains Hiromori Mori, NGK do Brasil Technical Assistance consultant. According to the expert, new technologies applied to coils make the part even more important for the ignition system and, consequently, for o motor. "Ignition coils are developed to meet the needs of each engine, that's why, their models vary according to the projects of the assemblers", Mori comments.
despite the different types, the tests performed by mechanics during an overhaul are the same. The first step of the inspection is to perform a visual analysis., where it is possible to detect cracks and cracks in the coil body and oxidation in the high voltage towers and terminals. "A second stage, as important, is the measurement of the resistance of the coil's primary and secondary circuit., in addition to the supply voltage", indicates the Technical Assistance consultant. Os valores de referência para essa análise podem ser consultados por meio do SAC da NGK pelo telefone 0800-197-112. "It is noteworthy that some coils have an integrated ignition module and, that's why, it is not possible to perform the endurance test", complements Hiromori.
The main cause of coil failures is the use of spark plugs with excessive wear.. That is why, whenever one of the items of the ignition system has problems, it is recommended that a complete inspection of the assembly be carried out., composed of candles, cables and coils. "Heavily worn spark plugs require greater tension to generate the spark causing an overload of work on the ignition system, reaching coils and cables", alerta Hiromori Mori.
Another important tip, as per the NGK expert, especially in the case of individual coils, It's whenever one of the parts fails, preventively inspect the other coils. "When one of them has problems, you mean that, at any moment, the others can also fail. É papel do mecânico orientar o cliente em relação a este cuidado, avoiding future damage, once, in a short time it may be necessary to replace the coils again", recommends the expert.