Category Archives for Fuel System

Bosch-Common Rail System – Fuel injector correction factor

1 Fuel injector 2 Identification number Inside the hydraulic servo system there are various restrictions with extremely small diameters which have specific manufacturing tolerances. These manufacturing tolerances are given as part of an identification number which is located on the … Continue reading

27. August 2018 by sam
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Bosch-Common Rail System – Operating principle of the fuel injectors

A Fuel injector closed B Fuel injector open 1 Solenoid valve coil 2 Feed channel 3 Valve ball 4 Feed restriction 5 Feed channel to nozzle prechamber 6 Injector needle 7 Nozzle prechamber 8 Injector needle control spring 9 Valve … Continue reading

27. August 2018 by sam
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Bosch-Common Rail System – Fuel injectors

1 Connection, leak-off pipe 2 Retainer 3 Plastic ring 4 Seal ring 5 Combustion chamber seal 6 High pressure fuel line connection 7 Electrical connection – solenoid valve NOTE: The combustion chamber sealing rings must not be reused. The exact … Continue reading

27. August 2018 by sam
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Bosch-Common Rail System – High pressure fuel lines

NOTE: The bending radii are exactly matched to the system and must not be changed. NOTE: After disconnecting one or more high pressure fuel lines, these must always be replaced. Reason: The reason for this is that leaks can occur … Continue reading

27. August 2018 by sam
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Bosch-Common Rail System – Fuel rail (common rail)

1 Fuel pressure sensor The fuel rail is made of forged steel. The common rail performs the following functions: • stores fuel under high pressure and • minimizes pressure fluctuations. Pressure fluctuations are induced in the high-pressure fuel system due … Continue reading

27. August 2018 by sam
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Bosch-Common Rail System – Zero delivery valve

1 From high-pressure chamber annular channel 2 Zero delivery valve 3 Calibrated bore (ø = 0.4 mm) 4 To transfer pump The zero delivery valve is located between the annular channel that is connected to the inlet valves of the … Continue reading

27. August 2018 by sam
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Bosch-Common Rail System – High pressure generation

1 High pressure to fuel rail 2 Outlet valve 3 Spring 4 Fuel feed 5 Drive shaft 6 Eccentric cam 7 High-pressure chamber 8 Pump plunger 9 Inlet valve The high-pressure pump is driven via the drive shaft. An eccentric … Continue reading

27. August 2018 by sam
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Bosch-Common Rail System – Overflow throttle valve

A Low engine speeds B Increasing engine speeds C High engine speeds 1 Transfer pump pressure 2 Time 3 Compression spring 4 Orifice 5 To the high-pressure chambers 6 Control piston 7 Lubrication/cooling/ventilation – high-pressure pump 8 High-pressure pump cooling … Continue reading

27. August 2018 by sam
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Bosch-Common Rail System – Transfer Pump

1 Intake side 2 Drive gear 3 Delivery side The transfer pump is designed as a gear pump and delivers the required fuel to the high-pressure pump. Essential components are two counter-rotating, meshed gear wheels that transport the fuel in … Continue reading

27. August 2018 by sam
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Bosch-Common Rail System – High pressure pump

High pressure pump CP3.2 1 Transfer pump 2 Fuel metering valve 3 Pump plunger 4 Eccentric 5 Drive shaft 6 Pump housing High pressure pump CP1H 1 Fuel metering valve 2 Fuel return port 3 Fuel supply port 4 Transfer … Continue reading

27. August 2018 by sam
Categories: Fuel System | Leave a comment

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