What Causes Oil to Enter the Spark Plug?
1 Answers
Oil entering the spark plug is due to the aging of the valve cover gasket, which is responsible for sealing the engine lubricating oil. When this component ages, lubricating oil naturally appears on the spark plug. Additionally, the spark plug itself may have quality issues (such as gap misalignment or short circuits), and these oil contaminants enter through the threads, necessitating the replacement of a new spark plug. The spark plug, commonly known as the 'fire nozzle,' functions by discharging the high-voltage pulse electricity sent from the high-voltage wire (spark plug wire), breaking down the air between the two electrodes of the spark plug to generate an electric spark, thereby igniting the air-fuel mixture in the cylinder. The main types of spark plugs include: standard spark plugs, extended insulator spark plugs, electrode-type spark plugs, seat-type spark plugs, pole-type spark plugs, and surface-gap spark plugs, among others.