Fuel System - Operation and Tests/In-line Injection Pump CTM3274 (01JUL99) 220-20 Saran Liter Engines 060799 PN=359 IN-LINE FUEL INJECTION PUMP OPERATION Filtered fuel under pressure by the supply pump fills the injection pump fuel gallery (C). As the camshaft rotates, roller tappets (G) riding on the camshaft (H) lobes operate the plungers (D) to supply high pressure fuel through the delivery valves (B) to the injection nozzles. A governor-operated control rack (E) is connected to the control sleeves (F) and plungers to regulate the quantity of fuel delivered to the engine.
Engine lubricating oil is piped to the injection pump camshaft case (J) to provide splash lubrication of the working parts. Drain hole at the front end of the pump determines the level of oil maintained in the camshaft case. Excess oil drains out of this hole and returns back to the engine through the timing gear cover. A—Fuel delivery pipe B—Delivery valve C—Fuel gallery -UN-22FEB99 D—Barrel and plunger E—Control rack F—Control sleeve G—Roller tappet H—Camshaft J—Camshaft case CD30741 CD,3274,G220,24-19-04JAN99 220 20