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SERIES 50 SPARK PLUGS

The condition of the spark plug determines the high voltage level and is the single most important component in the ignition system. The size of the electrode gap, condition of the electrodes, and the amount of deposits on the electrodes all affect the life of the spark plug. The electrodes of the spark plug are made from platinum which will minimize electrode wear. ‪

The spark plug can be regapped if the electrode wear and amount of deposits are low. If either of these conditions are excessive, replace the spark plug.For engine model 6047-TKG8 measure the spark plug gap using a 0.381 mm (0.015 in.) feeler gage. Effective with engine serial number 04R0045632 model 6047-MKG8 measure the spark plug gap using a 0.254 mm (0.010 in.) feeler gage. ‪

Removal of Spark Plug

Remove the spark plug from the cylinder head as follows: ‪

  1. Remove the ignition coils. Refer to Section .
  2. Remove the plug using a 5/8 in. thin wall spark plug socket and appropriate extensions.
Cleaning of Spark Plug Terminal, Ceramic Insulation, and Socket Area

Clean the spark plug terminal, ceramic insulation, and spark plug socket as follows: ‪

EYE INJURY

To avoid injury from flying debris when using compressed air, wear adequate eye protection (face shield or safety goggles) and do not exceed 40 psi (276 kPa) air pressure.

  1. Remove dirt and debris with compressed air.
  2. Remove oil and grease deposits.
  3. Inspect the spark plug.
Inspection of Spark Plug

Inspect the spark plug as follows: ‪

  1. For engine model 6047-TKG8 measure the spark plug gap using a 0.381 mm (0.015 in.) feeler gage. Effective with engine serial number 04R0045632 model 6047-MKG8 measure the spark plug gap using a 0.254 mm (0.010 in.) feeler gage.
    1. If the spark plug gap measured is not to specifications, regap the plug and reuse. Refer to Section .
    2. If the spark plug gap is within specifications, reuse the spark plug. Refer to Section .
  2. Visually check the spark plugs for excessive deposits and condition of the electrode.
    1. If the spark plug has excessive deposits and electrode wear, replace the spark plug. Refer to Section .
    2. If the spark plug has no deposits nor excessive electrode wear, reuse the spark plug. Refer to Section .

Installation of Spark Plug

Install the spark plug as follows: ‪

  1. Install the spark plug using a 5/8 in. thin wall socket and appropriate extensions. Torque the spark plug to 35-40 Nm (26-30 lbft).
  2. Install the ignition boot. Refer to Section .
  3. Install the ignition harness. Refer to Section .