99M90
21-40-01
Page: 4-3
Rev. New
Issued: May 9, 2012
I-Series Combustion Heater
Owners Manual
4.5
Spark Plug Cleaning
Type I Spark Plug (for I-1500 model only)
Cleaning is accomplished on a conventional aircraft type spark plug cleaner, except that it may
be necessary to use several adapters in order to raise the long extension of the plug far enough
out of the cleaner nozzle opening to provide an effective job. Plug the ceramic insert cavity at
the terminal end of the plug with a piece of paper or cloth to keep out any of the cleaning
sand. Wipe this cavity out thoroughly with a cloth. If, after cleaning spark plug, porcelain is
then white, and the electrodes are not eroded, re-gap the spark plug as described in Chapter 6.
Refer to Chapter 8 for additional maintenance details.
FIGURE 4.1
Type I Spark Plug
