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Page Title: ENGINE ASSEMBLY COMPRESSION TEST.
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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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