The wax motor style KSB is used on pre-1991 B series automotive engine ratings using the Bosch VE fuel pump. NOTE: The electrical solenoid style KSB is used on 1991 model and newer B series atuomotive engine ratings using the Bosch VE fuel injection pump. See Procedure (5-08), Cold Start Timing Advance System (KSB) –… Read More »
Governor regulation of 3 percent to 5 percent can be attained with the speed droop governor. Precise control of governor regulation is done by decreasing or increasing the effective length of the governor control spring, this also decreases or increases the spring control spring rate. The governor control spring is threaded into an adjusting cap… Read More »
There is a valve for each discharge tube. The purpose of the valve is to control the residual pressure in the high pressure line. A malfunctioning valve will cause an imbalance of the residual pressure resulting in rough engine operation or surging.
The fuel injection pumps are equipped with electrical shut off valves. These solenoid-operated valves block the supply of fuel to the high pressure pumping and distribution components. The Robert Bosch VE shut off valve is located at the top, rear of the pump. The Lucas CAV DPA/DPS shut off valve is located at the bottom… Read More »
Regulated pressure produced by a vane supply pump in both fuel injection pumps is used to advance the timing as the engine speed increases. A return spring is used to retard the timing as the engine speed is reduced. If a spring should break, the timing will go to the advance position resulting in torque… Read More »
Both fuel injection pumps are equipped with mechanical shut down levers. These levers are spring-loaded in the run position. Not all applications will use these manual shut down controls and there will be no cable or rod connected to the lever. NOTE: Partial actuation of the mechanical shut down levers will affect fuel flow and… Read More »
A – Idle Screw B – High Idle Screw The high speed adjustment screw on both fuel injection pumps provides the stop for full speed. The high speed adjusting screws are sealed. Adjustment of this screw must be performed only by an authorized fuel injection pump service center, and then resealed. The high speed adjusting… Read More »
The idle adjustment screw provides a stop for the lever at low speed. The adjustment screw can be used to increase idle speed for accessory loading or, if required, to lower the idle speed. The high idle screw is sealed and must be adjusted by an authorized repair shop, and then resealed. A – Idle… Read More »
The low idle adjustment screw on the DB4 fuel injection pump is mounted on the control lever assembly. The adjustment screw can be used to increase the idle speed to compensate for accessory loading. The low idle adjustment screw must be adjusted by an authorized service dealer and resealed. NOTE: Never turn the idle adjusting… Read More »
The amount of fuel injected and subsequently the speed and power from the engine is controlled by the fuel control lever. Restricted travel of the lever can cause low power. Always check for full travel of the lever when diagnosing a low power complaint.