Spark plug adjustment tool for Federal Mogul 18 GZ 44 / FB 78 WPN

Depending on the type of application, it may become necessary to change the default electrode gap of 0.35 mm:

  • Electrode gap between 0.25 mm and 0.35 mm for natural gas operation
  • Electrode gap between 0.40 mm and 0.60 mm for fermentation gas operation

Various so-called “pins” are available for adjusting different gap dimensions. These are colour-coded to make it easier to separate them.

  • Item no.


  • 99070

    Adjustment tool with 0.35 mm pin


    (The spark plug shown in the picture is not included.)

As a result of erosion of the spark plug electrodes during operation of the engine, the gap between the centre electrode and the ground electrode of the spark plugs steadily widens, and above a certain gap this can lead to misfirings as it is no longer possible to generate ignition sparks. Cleaning the spark plugs and readjusting the spark plug electrode gap can extend the service life of the spark plug up to its wear limit.

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