ARMY TM 9-2805-257-14
AIR FORCE TO 38G2-103-2
NAVY NAVFAC P-8-612-14E
4-19. Spark Plugs.
This task covers:
General Mechanics Tool Kit (Item 1, Appendix B)
Rags, Wiping (Item 6, Appendix D)
Wrench, Torque (NSN 5120-00-640-6364)
Solvent, Drycleaning (Item 7, Appendix D)
(Item 2, Appendix B)
This engine has two spark plugs. Perform all procedures on one plug then the other.
a. Removal. (figure 4-8)
(1) Loosen connector nut (1) on high tension cable (2) and remove cable from spark plug (3).
(2) Remove spark plug (3) and washer (4).
Drycleaning solvent PD-680 used to clean parts is potentially dangerous to personnel and
property. Avoid repeated and prolonged skin contact. Do not use near open flame or
excessive heat. Flash point of solvent is 100°F138°F (38°C-60°C).
Clean spark plug using drycleaning solvent, and inspect plug for burning, cracked or broken ceramic
insulation, and damaged thread. Replace plug if damaged.
Regap spark plug to .028 to .033 in. (.071 to .083 cm).
Installation. (figure 4-8)
(1) Install spark plug (3) and washer (4) and torque to 275-300 in.-lbs (49115-53580 gr cm).
(2) Install high tension cable (2) on spark plug (3) and tighten connector nut (1).