The KSB introduces a new fuel line (1), Figure 2, which routes fuel from the relief port (2) of the pressure regulator valve (3) to the plunger end (6), Figure 3, of the electrical solenoid, bypassing the normal return passage (6), Figure 1. With the key switch on, current flows from the key switch line… Read More »
Pump housing pressure acts on an internal timing piston (t), Figure 1, to partially advance the injection timing at idle, and fully advance the timing when the engine RPM reaches approximately 60% of rated speed. As pump pressure increases, timing advances. The pump housing pressure is controlled by the pressure regulator valve (2) (a spring… Read More »
The electrical solenoid style KSB is used on 1991 model and newer B series automotive engine ratings using the Bosch VE fuel pump. Note: The wax motor style KSB is used on pre-1991 B series automotive engine ratings using the Bosch VE fuel pump. See Section (5-07), Cold Start Timing Advance System (KSB) – Wax… Read More »
The wiring harness used on the wax motor style KSB can be inspected using a volt/ohm meter. NOTE: Pin ‘C ’ of the metro-pack connector is blank on the wax motor style KSB wiring harness. Use a volt/ohm meter to perform a continuity check between port A ’ of the metro-pack connector and the female… Read More »
Loosen and remove the KSB electrical element from the KSB housing. Apply 12 volts to the electrical terminal and a ground strap to the hexagonal portion of the element. Observe for extensional movement of the plunger. If the plunger does not move after approximately one minute, check to make sure the element has been correctly… Read More »
Remove the temperature switch. Caution: The switches are not interchangeable. White smoke will be present if the wrong temperature switch is used. Notes: 1) The wax motor KSB (used on pre-91 engines) uses a 160°F [71 °C] normally open coolant temperature switch, Part No. 3915945. 2) The electrical solenoid style KSB (used on 91 models… Read More »
The remote mounted KSB is used on B series automotive engines which have an air compressor. Caution: Most pumps will have a shim between the KSB and the timing piston. This shim must be reassembled between the cover plate and the timing piston. If this shim sticks to the KSB and is installed with the… Read More »
The early pump mounted KSB is a different design using two control lines. The two line version was superseded in mid-1988 with a one control line version which is the current design used for both production and service. There is no remote mount hardware available for the two control line KSB so they cannot be… Read More »
The KSB introduces a new fuel line (1), Figure 2, which routes fuel from the relief port (2) of the pressure regulator valve (3) to a pressure holeing valve (4), bypassing the normal return passage (6), Figure 1. The pressure holding valve (4), Figure 2, is closed when the engine is cold. When the engine… Read More »
Pump housing pressure acts on an internal timing piston (1), Figure 1, to partially advance the injection timing at idle, and fully advance the timing when the engine RPM reaches approximately 60% of rated speed. As pump pressure increases, timing advances. The pump housing pressure is controlled by the pressure regulator valve (2) (a spring… Read More »