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TM 10-4320-324-14
5-16. Engine Compression Check (CONT).
b.
Testing.
(1)
Install new packing (1), metal surface down,
compression gauge adapter (2) and nozzle retainer
(3).
(2)
Thread nut (4) on to cylinder head (5) stud and
tighten.
(3)
Attach compression gauge (6) to compression gauge
adapter (2). Ensure all connections are tight.
(4)
Place RUN switch to ON, then depress oil pressure
by-pass switch and start switch at same time. Hold
for about three seconds.
(5)
Record reading on compression gauge. Reading
should be between 290-406 psi (20-28 bar). If
compression reading is low, refer to Table 5-1,
Troubleshooting.
(6)
Release start switch and oil pressure by-pass switch,
then place RUN switch to OFF.
(7)
Remove compression gauge (6) from compression
gauge adapter (2).
5-46
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