The ignition coil must withstand voltage peaks of up to 40,000 volts.
The ignition coil is exposed to extreme temperature differences from -40 °C to 140 °C.
The direct mounting on the engine results in forces of up to 30 g.
Gasoline, oil and water splash challenge the ignition coil materials.
Cutaway model of a Bosch high-pressure injection pump HDP6
Flow control valve
The flow control valve precisely meters the amount of fuel required for the desired pressure in the fuel rail.
Pressure relief valve
The pressure relief valve prevents pressure peaks.
Pump piston
The pump piston draws in and compresses fuel, then presses it into the system under high pressure.
Pressure damper
The pressure damper smoothes pressure peaks and thus ensures a stable, constant system pressure.
High-pressure connection to the fuel rail
The high-pressure connection connects the high-pressure pump to the fuel rail.
Electrical connection
The engine control unit uses the electrical connection to control the quantity and pressure to be generated by the high-pressure pump.
Inlet valve
The inlet valve allows the fuel to flow into the pump chamber.
Cutaway model of a Bosch high-pressure injection valve HDEV6 short
Solenoid coil
The solenoid coil lifts the nozzle needle and triggers the injection process.
Nozzle needle
The nozzle needle opens and closes the injection holes.
Inlet filter
The inlet filter protects the valve from contamination.
Compression spring
The compression spring dampens the movements of the nozzle needle.
The high-pressure connection connects the high-pressure line coming from the fuel rail to the injection valve.
Teflon sealing ring
The Teflon sealing ring seals between the high-pressure injection valve and the cylinder head.
Cutaway model of a Bosch intake manifold injection valve EV14 long
The compression spring closes and dampens the movements of the nozzle needle.
The engine control unit controls the quantity and timing of the fuel injected via the electrical connection.
Ultrasonic cleaning effectively and gently removes combustion residues from high-pressure injectors without damaging the sensitive nozzle tip or altering the valve parameters.
The replacement of high-pressure injection valves and combustion chamber sealing rings can be performed easily thanks to detailed video instructions, the BTG 5120 tool kit and Bosch spare parts.
This video tutorial shows in detail how a Bosch high-pressure injection pump can be professionally removed and reinstalled.