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IGNITION SYSTEM 6D2-3 Spark Plug Removal 1. Remove spark plugs. Inspection and Repair The spark plug affects entire engine performance and replace if any. • Check electrode for wear, and replace if necessary. replace if faulty. • Adjust spark plug gap to 1.0 - 1.1 mm (0.027 in) - 0.8 mm (0.031 in). • Check fuel and electrical systems if spark plug is extremely dirty. • Use spark plugs having low heat value (hot type plug) if fuel and electrical systems are normal. • Use spark plugs having high heat value (cold type plug) if insulator and electrode are extremely burned. Sooty Spark Plugs Much deposit of carbon or oil on the electrode and insulator of Burning Electrodes This fault is characterized by scorched or heavily oxidized Measuring Insulation Resistance • Measure insulation resistance using a 500 volt megaohm meter. • Replace spark plugs if measured value is out of standard. Insulation resistance: 50 M Ω Ω Ω Ω or more |