TM-9-2815-237-34 HMMWV Engine Direct Support & General Support Maintenance Manual Download
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a. Cleaning 2-142 c. Testing TM 9-2815-237-34 2-37. FUEL INJECTION NOZZLE REPAIR This task covers: a. Cleaning c. Testing b. Inspection INITIAL SETUP: Tools General Safety Instructions General mechanic’s tool kit: ● Do not place hands or arms near nozzle during automotive (Appendix E, Item 1) testing. ● Compressed air for cleaning purposes will not Test Equipment exceed 30 psi (207 kPa). Nozzle tester (Appendix E, Item 31) ● Wear eyeshields when using compressed air. Manual References TM 9-2815-237-34P Equipment Condition Engine disassembled into subassemblies (para. 2-15). Clean fuel injection nozzle (2) in accordance with para. 2-9. NOTE For general inspection instructions, refer to para. 2-10. 1. Inspect fuel injection nozzle (2) for thread damage. Replace if damaged. 2. Inspect fuel injection nozzle return nipples (1) for damage. Replace fuel injection nozzle (2) if damaged. 3. Inspect fuel injection nozzle (2) for cracks and evidence of heat damage. Replace if cracked or damaged. 1. Preparation. (a) Connect fuel injection nozzle (2) to tester. (b) Connect lines to return line nipples (1). Do not place hands or arms near nozzle during testing. Penetrating force of oil may cause serious injury or death. (c) Close shutoff valve to pressure gauge on tester. (d) Operate tester to prime nozzle (2). 2. Obtaining pressure check. (a) Open shutoff valve to pressure gauge 1/4 turn. (b) Depress lever on tester slowly. Note at what pressure the needle on pressure gauge stops. Opening pressure must be between 1,500 psi (10,343 kPa) and 1,960 psi (13,514 kPa). Replace nozzle (2) if opening pressure does not meet specifications.