Bosch 0445750003 – The Unit Pump With Controlled Valve Lift For Precise Injection Rate Shaping

In a diesel engine, the injection rate-the speed at which fuel is delivered to the combustion chamber-determines the combustion quality, the noise level, and the emissions. If the injection rate is too high, the combustion is harsh and the engine knocks. If the injection rate is too low, the combustion is incomplete and the exhaust is smoky. The 0445750003 is a Bosch unit pump that is designed with a controlled valve lift that shapes the injection rate to match the engine's combustion requirement-the valve lift is controlled by a precision-ground stop that limits the valve's travel, and the lift is matched to the engine's fuel delivery requirement. It is the pump that shapes the injection rate, so the combustion is smooth, quiet, and efficient.

The unit pump is a pump and an injector in one-the plunger is driven by the camshaft, and the solenoid controls the start and end of injection. The injection rate is determined by the plunger speed and the valve lift-the valve opens to allow the fuel to flow to the injector nozzle, and the lift determines the flow area. If the valve lift is too high, the flow area is large, and the injection rate is high. If the valve lift is too low, the flow area is small, and the injection rate is low. The 0445750003 addresses this with a controlled valve lift that is matched to the engine's combustion requirement. The valve lift is controlled by a precision-ground stop that limits the valve's travel, and the stop is set to provide a specific lift that shapes the injection rate.

The 0445750003 uses a valve that is controlled by a precision-ground stop. The stop is a hardened steel pin that is pressed into the pump body, and it limits the valve's travel. The stop is ground to a specific length-the length determines the valve lift. The valve lift is set to provide a specific injection rate that is matched to the engine's combustion requirement. The lift is verified on each pump using a dial indicator.

The most common failure is a worn stop-the stop wears, and the valve lift changes. The symptom is a change in the combustion quality-the engine knocks or produces smoke.

Pump type: Unit pump (pump and injector)

Valve lift: Controlled by precision stop

Stop material: Hardened steel

Injection rate: Matched to engine

Plunger diameter: 6.0 mm

Maximum injection pressure: 1,800 bar

Solenoid resistance: 0.35 – 0.45 Ω

Operating voltage: 12 V DC

Q1: How can I tell if my valve lift has changed? → The engine knocks or produces smoke-the combustion quality has changed.

Q2: Can I replace a single unit pump? → Yes, but the pump must be coded to the ECU.

Q3: Why does my engine knock at idle? → The injection rate may be too high-the valve lift may be too high.

Q4: What is the most common cause of pump failure? → A worn stop-the stop wears, and the valve lift changes.

Q5: Does the pump work with biodiesel? → Yes, but biodiesel can accelerate the wear rate.

Q6: What is the warranty on the pump? → The pump has a 12-month warranty.

 

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