TM-9-2815-237-34 HMMWV Engine Direct Support & General Support Maintenance Manual Download
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TM 9-2815-237-34 2-37. FUEL INJECTION NOZZLE REPAIR (Cont’d) 3. Leakage test. (a) Open shutoff valve to pressure gauge one additional turn. WARNING Compressed air used for cleaning purposes will not exceed 30 psi (207 kPa). Use only with effective chip guarding and personal protective equipment (goggles/shield, gloves, etc.). (b) Blow-dry end of nozzle (2). NOTE A pressure of 1,400 psi (9,653 kPa) must be maintained for 10 seconds while checking for nozzle leakage. (c) Depress lever on tester until pressure gauge reads 1,400 psi (9,653 kPa) and observe tip of nozzle (2). If a droplet forms and drops off the nozzle (2) in 10 seconds or less, replace nozzle (2). 4. Chatter test. (a) Close shutoff valve to pressure gauge. (b) Depress lever on tester slowly, noting whether a chattering noise can be heard. NOTE Faster lever movement may cause nozzle to hiss or squeal rather than chatter; this is acceptable. (c) If no chatter is heard, increase speed of lever movement on tester until nozzle (2) chatters. If no chatter is heard, replace nozzle (2). 2-143