ARMY TM 9-2805-259-14
AIR FORCE TO 38G2-89-54
NAVY NAVFAC P-8-615-12E
This task covers:
Test
INITIAL SETUP
Tools
General Mechanic's Tool Kit (Item 1, Appendix B)
Tester, Cylinder Compression (NSN 4910-00-249-7318)
NOTE
Hold Carburetor throttle fully open to allow maximum air into the cylinder when testing for
compression.
(1)
Loosen connector nut (1) and remove high tension cable (2).
(2)
Remove spark plug (3).
Repeat steps 1 and 2 for remaining cylinders.
(3)
(4)
Install suitable pressure gage (4).
(5)
Using starter rope, crank engine over several times and check pressure gage reading on all cylinders.
(6) Compression reading should be 115 - 25 psi (793 - 862 Kpas) at sea level. Pressure reading will be less
above sea level.
(7)
Remove pressure gage (4).
(8)
Install spark plug (3) in all cylinders.
Install high tension cable (2) and tighten connector nut (1) in all cylinders.
(9)
(10) Compare readings from each cylinder. The readings should be within 10 psi (69 Kpas) of each other. Further
engine inspection is required if readings are not as specified.
Change 3
