Testing (cont)

INJECTOR TEST AND REPAIR INSTRUCTIONS (Continued) - TM-5-1940-277-34_286

INJECTOR TEST AND REPAIR INSTRUCTIONS (Continued) - TM-5-1940-277-34_288

TM-5-1940-277-34 Boat Bridge Erection Twin Jet Aluminum Hull Model USCSBMK1 (1940-01-105-5728) Manual
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TM 5-1940-277-34 INJECTOR TEST AND REPAIR INSTRUCTIONS (Continued) LOCATION ITEM ACTION REMARKS • Check time it takes to fall to 1,455 psig (99 atm). The time should be Less time indi- 10 seconds for cates damaged or new injectors, dirty injector. 6 seconds for Disassemble, in- reconditioned. spect and repair. e. Needle valve Seat Leakage Test: (10) • Wipe injector tip dry. • Pump tester to 2,962 psig (201.6 atm). • Hold pressure Nozzle tip damp- 10 seconds. ness is permissi- ble but drop must not be visible. • Repair if test failed. f. Injector Atomization Test: • Close valve on tester. • Pump tester Maintain until pressure pressure. between 2,962 and 3,036 psig (202 and 207 atm) is reached. • Examine four Each spray should sprays. have no visible streaks or dis- tortion. Spray should spread about 2 inches before hitting sides of contain- ers. Injector should break with hard note (pop). 2-265

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