Figure 1. Robert Bosch Model MW Fuel Injection Pump

Figure 3. Four Principle Plunger Positions of Injection Cycle

TM-5-3820-256-24-5 Drilling System Well Rotary Truck Mounted Air Transportable 600 Feet Capacity Model LP-12 NSN 3820-01-246-4276 Manual
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SERVICE MANUAL GENERAL Section 1 Figure 1. Robert Bosch Model MW Fuel Injection Pump 1. Shut-off Stop Screw 5. RQV Governor Housing 9. Mounting Adapter 2. Shut-off Lever 6. Fuel Supply Pump 10. Hand Priming Pump 3. High Idle Stop 7. Timing Pointer Plug 11. Plunger 4. Throttle Lever 8. Serial Number Plate 12. Aneroid DESCRIPTION The Robert Bosch Model PE(S)-6MW Injection Pump is used on the International DT-466C diesel engine. The injection pump is an in-line, plunger type, with an individual plunger and barrel pumping element for each engine cylinder. The injection sequence is 1,5, 3, 6, 2, 4. The injection pump assembly incorporates mechanical, flyweight type RQV variable speed governor. The pump throttle lever and the high-speed stop screw are located on the left side of the governor assembly. The fuel shut off lever is also located on the left side of the governor. The injection pump is located on the left side of the engine. High pressure lines connect the pump to the nozzles. Operating and service instructions for the nozzles are given in CGES-200-2 Service Manual. IDENTIFICATION Identification of injection pump and governor can be made by referring to two nameplates, one on the rear of the governor housing, and one on the front top left of the injection pump (Figure 2). The nameplate on the rear of the governor gives the IH part number of the complete pump and governor assembly and the Robert Bosch governor number, size and rating. The nameplate on the left side, gives the Robert Bosch pump description number. OPERATING PRINCIPLES The injection pump is the in-line type with an individual plunger and barrel pumping element for each engine cylinder. Each plunger stroke is constant, but its effective pumping (metering) stroke is variable and is controlled by the positioning of a common control rack connected through linkage to the governor and the vehicle’s throttle lever. The individual plunger and barrel pumping elements receive fuel at supply pump pressure from the injection pump housing fuel gallery, and forces it under very high pressure through the injection nozzles into the engine combustion chamber. The injection pump plungers are moved by tappet assemblies which ride on the lobes of the injection pump camshaft. The injection pump camshaft is timed to the engine to inject fuel into each cylinder at the proper time. CGES-375 Printed in United States of America Page 1

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