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TM 5-2420-222-34
3-1.
ENGINE ASSEMBLY COMPRESSION TEST.
This Task Covers: Test
Initial Setup:
Equipment Conditions:
Materials/Parts:
•
Fuel injection nozzles removed (see TM 5-2420-
•
Engine oil (Item 25, Appendix B)
222-20).
•
Marker tags (Item 32, Appendix B)
•
Electrical tape (Item 36, Appendix B)
Tools/Test Equipment:
•
One self-locking nut
•
General mechanic's tool kit
Personnel Required: Two
•
Field automotive shop set
General Safety Instructions:
References:
•
Wrap wiring harness terminal with electrical tape
•
TM 5-2420-222-20
when disconnected
TEST
1.
Remove self-locking nut (3) and wiring harness terminal (4) from fuel injection pump shutoff solenoid terminal (5).
Discard self-locking nut.
WARNING
To prevent electrical shock, exposed wiring harness terminal must be wrapped
with electrical tape before connecting battery ground cable.
2.
Wrap wiring harness terminal (4) with electrical tape.
3.
Connect battery ground cable to battery (see TM 5-2420-222-20).
NOTE
Compression of all four cylinders Is tested the same way. One cylinder is shown.
Repeat steps 4 through 7 for remaining cylinders as required.
4.
Install cylinder compression tester in fuel injector hole (1) on cylinder head (2).
WARNING
Stay clear of rotating fan blades when cranking engine. Failure to follow this
warning may result in serious injury to personnel.
CAUTION
Do not operate starter for more than 20 seconds at a time. Allow two minutes for
cooling before using starter again, or it may overheat.
5.
Crank engine assembly with starter for about five seconds while an assistant records cylinder compression tester
reading.
6.
Remove cylinder compression tester and add 1 oz (29.57 ml) of clean engine oil in combustion chamber.
3-2
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