Bosch OEM Fuel Injection Pump Assembly Part Numbers 0445020137
Part Number: 0445020137
Brand: for Bosch
Type: High-pressure fuel injection pump
Material: High-grade steel with corrosion-resistant treatment
Pressure Range: Designed for modern diesel fuel systems (exact specs vary by engine model)
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Product Introduction
1. Bosch CP3 Series High Pressure Fuel Pump - Replacement Part 0445020137 (5258264) Fits Cummins 6.7L ISBe/ISDe Diesel Engines.
2. Widely used in commercial trucks, buses, and heavy machinery.
3. High Energy efficiency index
- Volumetric efficiency ≥95%@2000rpm
- Mechanical efficiency ≥93% rated working condition
- Specific energy consumption ≤0.18Wh/mm³ (industry leading)
4. Precision Fluid Dynamics Design
- Incorporates 7th-gen high-pressure radial plunger technology (Patent DE102017206735A1)
- CFD-optimized fuel channels reduce turbulent losses by 27%
- Dynamic pressure fluctuation controlled within ±8bar (@1800bar operating condition)
5. Advanced Materials Engineering
- Plasma-sprayed WC/Co plunger coating (30±2μm thickness, ≥1400HV hardness)
- Nano-crystallized 16MnCr5 alloy cam ring
- Ceramic-reinforced composite bearings (DIN ISO 4379 compliant)
Product Specifications Summary
Mechanical Parameters
Pump type: CP3.3 series radial piston pump
Mounting: Flange-mounted, 3-point fixation
Drive method: Gear-driven, 1:1 ratio
Rotation direction: Clockwise (viewed from drive end)
Weight: 6.8kg (including mounting bracket)
Hydraulic Performance
Maximum delivery pressure: 1850bar (peak)
Operating pressure range: 300-1800bar
Theoretical displacement: 0.55cm³/rev
Rated speed range: 800-2800rpm
Maximum speed: 3000rpm (instantaneous)
Electrical Specifications
Metering valve type: Proportional solenoid valve
Operating voltage: 12/24V DC
Coil resistance: 2.8Ω±0.3 (at 20℃)
Maximum operating current: 3.2A
Connector type: AMP Superseal 1.5 series
Structure & Working Principle
(1) Key Components
- High-pressure plungers: Driven by the engine camshaft to generate ultra-high-pressure fuel.
- Fuel metering valve (SCV): The ECU controls fuel flow via PWM signals to regulate rail pressure.
- Pressure relief valve: Prevents excessive fuel pressure, protecting the system.
- Inlet metering valve (IMV) (on some models): Adjusts the amount of fuel entering the high-pressure pump.
(2) Operational Workflow
- Low-pressure fuel supply: Fuel tank → fuel filter → low-pressure transfer pump (4–6 bar) → enters CP3 pump.
- High-pressure fuel generation: Camshaft drives plungers to compress fuel → pressure rises to 1,600–1,800 bar.
- Common rail distribution: High-pressure fuel enters the rail → distributed to each injector.
- ECU-controlled injection: Precisely controls injection timing and quantity based on sensor data (e.g., rail pressure sensor, crankshaft position sensor).
Common Failures & Diagnostics
(1) Typical Failure Symptoms
- Hard starting / No start (low fuel pressure, triggers P0087).
- Loss of power / Poor acceleration (worn pump unable to maintain rail pressure).
- Engine stalling (stuck fuel metering valve or electrical fault).
- Fuel leaks (damaged seals or high-pressure lines).
- Diagnostic Trouble Codes (DTCs):
- P0087 – Fuel rail pressure too low
- P0191 – Fuel rail pressure sensor malfunction
- P0251 – Fuel metering control fault
(2) Troubleshooting Steps
- Check low-pressure fuel system (clogged filter, faulty transfer pump).
- Use a diagnostic tool to monitor real-time rail pressure (compare ECU demand vs. actual value).
- Test the fuel metering valve (SCV) (measure resistance, typically 2–5 Ω).
- Inspect high-pressure pump for leaks (check for fuel seepage).
Maintenance & Replacement Recommendations
- Replace fuel filters regularly (prevents contamination damage).
- Use high-quality low-sulfur diesel (reduces wear on injection system).
- Bleed air after replacement (prevents airlocks in the high-pressure system).
- Avoid running on low fuel (prevents pump overheating).
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