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ARMY TM 9-2805-256-14 AIR FORCE TO 38G2-102-2 NAVY NAVFAC P-8-611-14E 5-24. Compression Test. This  task  covers: Test INITIAL  SETUP Tools General Mechanic’s Tool Kit (Item 1, Appendix B) Tester, Cylinder Compression (NSN 4910-00-250-2423) (Item 2, Appendix B) Test. (figure 5-26) (1) (2) (3) (4) (5) (6) (7) Disconnect  ignition  cable  (1)  from  spark  plug  (2). Remove  spark  plug  (2)  from  engine  (3). Install suitable pressure gage (4) in spark plug hole. Using  starter  rope  crank  engine  several  times,  and  check  pressure  gage. NOTE As  altitude  increases  cylinder  compression  will  decrease. Cylinder compression should be a minimum of 90 psi (63279 kpa) at sea level. Remove  pressure  gage  (4). Install spark plug  (2), and  connect  ignition  cable  (1). 5-52


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