I have a KSB solenoid on a 1993 1.9 TD Golf pump. It has a terminal on it for 12v.
Because this AAZ engine / pump is not going back into a vw, what do I do with the KSB? Have a switched 12v wire to it at all times?
Dug up some info on the KSB and 1st gen Cummins;
KSB = 'Kaltstartbeschleuniger' – which is German for “Cold-Start-Device”.
The KSB is the little round component about the size of a tall shot glass mounted on the drivers side of the injection pump. The early KSB and late KSB do NOT swap, nor do they have the same operating function.
The KSB is used as a cold start aid. It will advance the timing on the engine when cold, and is designed to provide substantial injection timing advance in the low engine rpms so as to improve engine operation / emissions when the engine is stone cold after start-up. When in the engine rpms come up, the substantial timing advance tapers off to a much smaller measure of advance. The KSB does not function after the engine coolant reaches ~160* F.
VE44 Non-Intercooled KSB.
Pre '91 engines used the ‘wax motor’ type KSB, called so because a pellet of encapsulated engineering wax/plastic expanded when heated to move a plunger, which internally advanced the timing. 1988 emission requirements required the timing to be advanced when cold, to reduce white smoke. The non-intercooled trucks have a "wax motor" that opens the bypass passage in the KSB unit. When the ignition switch is turned ‘on’ an internal heating element begins to heat up the wax, the expansion of which opens the bypass. It may also have a voltage reducing resistor, but I am not sure. The wax motor style does not open instantly, but relies on an approximate warm-up delay to simulate the time required for the truck to warm up. The KSB is located on the driver's side, low, and toward the front of the VE44 pump.
The earlier 89-91.5 (non-I/C) wax motor type KSB holds the valve open when cold. When the engine is started the valve is already open, increasing timing. As the engine warms the pellets melt and the valve closes. This type requires 12v to close and function correctly. Without 12v power, the KSB will remain on, which can be hard on the pump.
VE44 Intercooled KSB.
The 91.5-93 KSB works in conjunction with a thermistor sensor in the head. When the ignition switch is in the ‘on’ position, 12v power is present at the thermistor. When cold, the thermistor sends 12v power to the KSB solenoid, which opens the KSB. Upon starting the engine, injection pump internal case pressure will advance the timing. 12v switched power is required for the KSB to open and function correctly, and will turn off when the thermistor sensor warms up and opens the 12v circuit, thus removing 12v power to the KSB. If unplugged, the KSB will simply not function, which will only possibly make a difference when cold. Under 90 deg., voltage is applied to the solenoid, blocking the fuel return path, and using internal pump fuel pressure, advances the timing slightly. Over 90 deg., no current is applied to the KSB solenoid, fuel is allowed to return via the normal operating fuel path. The timing advances normally thru internal porting, and sliding plunger. Also, between the switch and the solenoid is a resistor, mounted to a bracket on the side of the head, that reduces the voltage to the solenoid down to ~ 8V (when current is flowing through it & the solenoid -- if you just disconnect the wire at the solenoid you will get battery voltage). The solenoid operated KSB works instantly when you connect & disconnect the voltage to it -- when it is working you can hear the engine speed pick up and drop off connecting & disconnecting it.
Wondering which type vw used?
Topic: KSB solenoid....which type does VW use? (Read 8288 times)
