TM-9-2815-202-34 Technical Manual for 8V71T Engines for M109 Howitzer Download
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TM9-2815-202-34 (3) High pressure leak test WARNING Fuel injector may contain residual fuel oil and can emit a high pressure jet of fuel oil from spray tip when bumped. Always hold injector so that tip will spray away from skin. Fuel oil which enters blood stream may cause serious infection. (a) Place fuel injector (37) in injector test fixture (38). WARNING (4) Compressed air used for cleaning purposes will not exceed 30 psi. Use only with effective chip guarding and personal protective equipment (goggles/shield, gloves, etc). (b) (c) (d) (e) Thoroughly dry injector with compressed air. Check fuel connections for leaks. If leaks have occurred, tighten connections, dry injector, and recheck. With injector rack in FULL FUEL position (fully depressed) and popping handle (39) locked in downward position, operate pump handle (40) to build up and maintain pressure. Pump up injector tester and maintain pressure of 1600 to 2000 psi. Inspect for leaks at fuel connector gaskets, injector body plugs, and injector nut seal ring. Spray pattern (a) Place fuel injector (37) in injector test (b) (c) (d) Place injector rack in FULL FUEL position (fully depressed). Operate pump handle (40) to build up slight pressure (10 psi minimum) in system. Pop fuel injector several times with popping handle (39). Observe spray pattern emitted from fuel injector spray tip. If spray tip does not produce uniform pattern, dirty or damaged spray tip orifice is indicated. Change 1 4-233