How to (not) kill an engine by simply changing the spark plugs?

Usually, without having a special candle key on hand, car owners try to use what is available. Alexei Revin and Mikhail Kolodochkin, experts at Za Rulem, the oldest and most authoritative automotive publication in Russia, talked about all the dangers of this approach.

The first mistake. By using a properly sized tall cap instead of a spark plug wrench, car owners drop the spark plug to the bottom of the pit. As a result, the side electrode at the spark plug can bend, reducing the gap. This then affects the operation of the engine and its resource.

Most engines require 16 spark plug wrenches, but there are exceptions, as in the case of Citroën and Peugeot cars, a 14 wrench is required here.

Most engines require 16 spark plug wrenches, but there are exceptions, as in the case of Citroën and Peugeot cars, a 14 wrench is required here.

Second mistake – incorrect tightening torque of the candle (this is indicated in the manual or on the packaging of candles). To control the force it is necessary to use a torque wrench, and not everyone has one.

A weak tightening threatens a breakthrough of gases through the seals. The wire will quickly become clogged with soot and the engine will somehow work. Over-tightening can damage the spark plug. As a result, fragments of ceramics enter the combustion chamber and deform it.

third mistakeWhat drivers are less likely to allow was to increase the gap between the electrodes of the candle to upgrade it for themselves. For modern engines, this is unacceptable and has a bad effect on the combustion quality of the mixture. This has a bad effect not only on the operation of the engine and its power, but also on the resource.

Read about other important points when replacing candles in the original article by Alexei Revin and Mikhail Kolodochkin “Changing candles – ruining the engine? 6 fatal mistakes of car owners.

Source: Z R

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