Quantcast ROOSA Master Fuel Injection Pump

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pressure  on  the  fuel  within  the  pumping  chamber. Residual pressure in the fuel lines closes the reverse flow check valve in the pump and prevents surges on the fuel lines. No fuel flowing permits the injection valve to close  and  complete  injection. The camshaft continues to lift the plunger to the top of the stroke. The fuel in the housing fills the space in the pumping chamber through the fuel outlet until the sleeve closes the outlet on the downward stroke. Spring pressure  pushes  the  plunger  farther  down  as  the Figure 5-15.-Sleeve metering fuel pump. camshaft rotates, allowing the fuel inlet to fill the rest of the chamber and restarting the cycle. GOVERNOR.—  The  mechanical  type  governor shaft  of  the  governor  for  the  sleeve  metering  fuel system  controls  the  position  of  the  sleeve  on  the plunger, which regulates the amount of fuel injected. The   volume   of   fuel   injected   is   equal   to   the displacement   of   the   plunger   lift   into   the   barrel between the start and end of injection. The start-up control sets the fuel injection pumps at full stroke to aid  in  starting,  regardless  of  the  throttle  position. Normal  governor  operation  takes  over  at  low-idle speed, approximately 500 rpm. TROUBLESHOOTING   AND   ADJUST- MENTS.— Most problems in this system can be traced to lack of fuel, low fuel pressure, dirty fuel filters, poor quality fuel, or a broken or damaged fuel line. Air enters the fuel system when there are loose connections of the suction side of the pump. Individual fuel injection pumps for each cylinder with built-in calibration means little or no balancing or adjustment.  Before  you  calibrate  any  sleeve  metering fuel system, be sure the proper tools and manuals are available. ROOSA MASTER FUEL INJECTION PUMP The  Construction  Mechanic  3  &  2  covers  the general  construction  and  operation  of  the  Roosa  Master DB and DC fuel injection pumps. In  this  TRAM  AN,  you  will  learn  about troubleshooting,   disassembly,   inspection,   reassembly, and testing of the basic DC fuel pump of the Roosa Master system. Before you perform any work on an injection pump, refer to the manufacturer’s maintenance and  service  manuals. The troubleshooting chart (table 5-1 ) lists some of the problems and their possible causes that you might encounter in the Roosa Master fuel system. Troubleshooting A field test (Kiene) on an engine is an efficient way to pinpoint the cause of poor engine performance. This test will eliminate unnecessary fuel injection pump removal.  Since  this  field  test  permits  some  analysis  of engine condition, as well as the fuel system, you will quickly see the extent of the difficulty and the required remedies. 5-13

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