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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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