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AC 43.13-1B 9/8/98 FIGURE 8-3. Hot and cold spark plugs. b. Reach. The spark plug reach (see fig- ure 8-4) is the threaded portion which is in- serted into the spark plug bushing of the cylin- der. A plug with the proper reach will ensure that the electrode end inside the cylinder is in the best position to achieve ignition. Spark plug seizure or improper combustion within the cylinder will probably occur if a plug with the wrong reach is used. Shell threads of spark plugs are classified as 14- or 18-mm spark plug diameter, long reach or short reach, thus: c. Installation Procedures. When in- stalling spark plugs, observe the following procedure. (1) Visually inspect the plug for clean- liness and condition of the threads, ceramic, and electrodes. NOTE: Never install a spark plug which has been dropped and always use new gaskets every time you install a spark plug. (2) Check the plug for the proper gap setting, using a round wire feeler gauge as shown in figure 8-5. In the case of used plugs, procedures for cleaning and regapping are usu- ally contained in the various manufacturers’ manuals. Diameter 14 mm 18 mm Long reach Short reach 1/2 in (12.7 mm) 3/8 in (9.53 mm) 13/16 in. (20.64 mm) 1/2 in (12.7 mm) FIGURE 8-4. Spark plug reach. Page 8-10 FIGURE 8-5. Method of checking spark plug gap. (3) Check the plug and cylinder bushing to ascertain that only one gasket is used per spark plug. When a thermocouple-type gasket is used, no other gasket is required. (4) Apply anti-seize compound spar- ingly to the shell threads, but do not allow the compound to contact the electrodes since the material is conductive and will short out the Par 8-15PDF Image | AFS-640
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