Bosch injection pump in exchange

With the mechanical fuel injection pumps Bosch VE
mechanical fuel injection pumps, leaks may occur at the cover plate of the cold start accelerator (KSB).
A new cover plate for the cold-start accelerator (KSB) has been introduced on all models to prevent possible leaks at the mechanical
has been introduced on all models to prevent possible leaks from the Bosch VE mechanical injection pump.

Order number Cover plate (Reinforced) KSB 1465530861 it needs gasket 9968113.
Recognition new °8581113815°
new °8581313815
old 8581213815°
old 8581113815

After replacing the KSB cover plate, carry out the following check on the coolant temperature switch.
The coolant temperature switch is located in the water pump housing. The KSB is supplied with power via this switch.
The KSB is supplied with power via this switch. It is a normally open contact, i.e. the switch is open when the coolant temperature
open when the coolant temperature is below the threshold values listed below.
Two different coolant temperature switches are available:
- Switch with part number 504062682 for engines with turbocharger: It closes as soon as the
coolant temperature exceeds 30 ºC (86 ºF).
- Switch with part number 504101267 for non-turbocharged engines: It closes when the coolant temperature exceeds
coolant temperature exceeds 55 ºC (131 ºF).
If the coolant temperature is below these thresholds, the engine runs with premature start of injection.
When the engine is started, the coolant temperature begins to rise. The
The coolant temperature switch closes when the coolant reaches the threshold, setting the pump adjustment to normal.
the pump adjustment to the normal setting.
If the coolant temperature switch is not functioning properly, the
fuel injection pump remains set to start injection prematurely and the KSB operates continuously in cold start mode.
continuously in cold start mode. This can lead to serious damage to the engine or the fuel
the fuel injection system.
The cracks in the KSB cover plate (through which the fuel leaks) are possibly due to the
the unusually high pressure load on the cover plate, which occurs when the coolant temperature
coolant temperature switch is not functioning properly.
It is prohibited by law to disconnect the KSB.
Procedure for checking the operation of the coolant temperature switch:
- Connect the positive lead of an electrical tester to the heating element of the
KSB and the negative cable to ground.
- Ensure that the parking brake is engaged, and that all gears and
gear ranges are shifted to neutral. Then start the engine.
- If the coolant temperature is below 30 ºC (86 ºF) for turbocharged engines or below 55 ºC (55 ºF) for non-turbocharged engines, check the engine coolant temperature.
(131ºF), the coolant temperature switch is open and the tester shows no power.
is open and the tester will show no current flow. As soon as the
temperature threshold is reached, the coolant temperature switch closes and the tester
tester will indicate a 12 V power supply. If you observe this behaviour during the
behaviour during the check, the coolant temperature switch is functioning properly and no further
no further action is required.
Note: If the ambient temperature is high or the engine is already warm, the
If the ambient temperature is high or the engine is already warm, the tester may show a 12 V power source immediately after starting the engine.
- If the tester does not indicate 12 V voltage even though the temperature threshold has been reached, check the connections.
is already reached, check the coolant temperature switch connections. If
no 12 V voltage source is displayed again, replace the coolant temperature switch.
coolant temperature switch.