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TM 5-2420-222-34 3-1. ENGINE ASSEMBLY COMPRESSION TEST (Con’t). 7. Install cylinder compression tester in fuel injector hole (1) and repeat step 5. 8. Minimum allowable cylinder compression pressure is 350 psi (2413 kPa).  Pressure below 350 psi (2413 kPa) is not acceptable.  Difference in pressure between cylinders must not exceed 50 psi (345 kPa). (a) If first test on dry cylinder shows pressure less than specifications, and second test with oil in cylinder shows the same low pressure, disassemble engine and check valves on this cylinder. (b) If first test on dry cylinder shows pressure less than specifications, and second test with oil in cylinder shows normal pressure, disassemble engine and check piston and piston rings for defects. (c) If difference in pressure between cylinders is more than 50 psi (345 kPa), disassemble engine and check for defects as described above. (d) If  first  test  on  dry  cylinder  shows  pressure  less  than  specifications  in  two  cylinders  next  to  each  other,  and second test with oil in cylinder shows the same low pressure in the same two cylinders, disassemble engine and check for a defective head gasket. TA701218 3-3

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