Fuel System - Operation and Tests/Distributor Injection Pump CTM3274 (01JUL99) 220-13 Saran Liter Engines 060799 PN=352 STANADYNE FUEL INJECTION PUMP (DB2/DB4) - OPERATION The main rotating components are the drive shaft (1), This pump contains its own all-speed mechanical distributor rotor (2), transfer pump (5) and governor (11). The centrifugal force of weights (12) in governor (11). their retainer is transmitted through a sleeve to a governor arm and through a positive linkage hook to The drive shaft engages the distributor rotor in the the metering valve. The metering valve can be closed hydraulic head (3).
The drive end of the rotor to shut off fuel through a solid linkage by an incorporates the transfer pump. independently operated shut-off lever. The plungers (9) are actuated towards each other The automatic speed advance (13) either advances simultaneously by an internal cam ring (10) via or retards hydraulically the beginning of fuel delivery rollers (16) and shoes which are carried in slots at from the pump. This can respond either to speed the drive end of rotor. The number of cam lobes alone or to a combination of speed and load normally equals the number of engine cylinders. changes. The transfer pump at the rear of the rotor is of a IMPORTANT:
Remember that all adjustments to positive displacement vane type and is enclosed in the injection pump - except for slow the end caps. These end caps also house transfer idle - must be carried out on a test pump inlet (17), fuel strainer and pressure bench by a specialist injection pump regulator (6). Transfer pump pressure is automatically repair station only. Internal compensated for changes in viscosity due to adjustments in the field are not temperature and variations in fuel grade. permitted, as this pump is a sealed unit.
The distributor rotor incorporates two inlet passages (18) and a single axial bore with one delivery valve (4) to serve all discharge fittings (7) to the injection lines. The hydraulic head contains the bore in which the rotor revolves, the metering valve (8) bore, the charging ports and head discharge fittings. CD,3274,G220,10-19-01FEB94 220 13