Part number 4076442 for a Cummins High-Pressure Fuel Injection Pump. Specifically, it's a Bosch VP44 rotary distributor-type pump. This is an electronically controlled pump that was a major step between mechanical injection and full common-rail systems.

1. Primary Engine Applications

This pump is most famously used on:

• Cummins B-Series Engines: The iconic 6BT5.9 (5.9L inline-6) engine.

• Cummins C-Series Engines: Such as the 6CT8.3 (8.3L inline-6).

These engines are known for their durability and were widely used in:

• Trucks & Buses: (e.g., Dodge Ram with the 5.9L, various medium-duty trucks).

• Industrial & Construction Equipment: Loaders, excavators, cranes.

• Power Generation: Diesel generator sets.

• Marine: Auxiliary and propulsion engines.

The Professional Remanufacturing Process：

A true remanufacture is a complete overhaul to like-new specification, not just a cleanup and reseal.

Phase 1: Initial Inspection & Teardown

1. Visual & Historical Inspection: Document the pump's condition and customer-reported symptoms.

2. Bench Testing (Pre-Teardown): If possible, mount the pump on a test bench to check its delivery pressure, volume, and ECU communication. This establishes a baseline and confirms failure.

3. Complete Disassembly: The pump is stripped down to its last component. All parts are carefully organized.

Phase 2: Critical Cleaning & Evaluation

1. Ultrasonic Cleaning: Every metal component undergoes ultrasonic cleaning in specialized solvents to remove all varnish, carbon, and microscopic contaminants.

2. Magnafluxing/Dye Penetrant Inspection: The main housing and other high-stress parts are inspected for hairline cracks.

3. Precision Measurement & Comparison to Specs: This is the heart of quality remanufacturing. Using micrometers, dial indicators, and optical comparators, technicians measure:

• Rotor & Roller Head Assembly: The most critical wear item. The clearance between the rotor and head is measured. Any wear beyond factory tolerance mandates replacement of this matched set.

• Cam Ring: Checked for wear on the internal lobes.

• Drive Shaft & Bearings: Checked for play and wear.

• Pressure Control Valve (PCV), Solenoid Valves, and Sensors: Electrically and functionally tested.

Phase 3: Replacement & Assembly with Critical Upgrades

1. Mandatory Replacement Parts (The "Kit"): Every seal, O-ring, gasket, and spring is replaced with new, high-quality equivalents.

2. Core Component Replacement: Any part that does not meet new factory specifications is replaced with a new or serviceable core part. For the VP44, this almost always includes:

• The Complete Rotor Head Assembly (rotor, rollers, head)

• The Transfer Pump (Vane Pump) Internals

• The Cam Ring

• All Bearings and Seals

3. Electrical Component Service: The internal ECU (Electronic Control Unit) on the pump is a common failure point. A quality rebuilder will either:

• Replace it with a new or guaranteed-remanufactured ECU.

• Perform component-level repair (reflowing solder joints, replacing capacitors) by a specialist technician.

4. Assembly in a Clean Environment: Reassembly is done in a dedicated, dust-controlled area using proper torquing procedures and lubricants. This prevents contamination, the #1 killer of new pumps.

Phase 4: Final Testing & Calibration (The Most Important Step)

The pump is mounted on a computerized diesel injection pump test bench.

1. Prime and Leak Check: The pump is filled with test oil and checked for external leaks.

2. Pressure and Flow Tests: The pump is run at various RPMs and load simulations. Technicians verify:

• Transfer Pump Pressure

• High-Pressure Output (must reach and hold spec, e.g., 1600+ bar)

• Delivery Volume across all cylinders (balance)

3. ECU Communication & Dynamic Response: The pump's ECU is plugged into a simulator to test solenoid response and pressure control across the entire operating map.

4. Final Calibration: The pump's calibration data is checked and adjusted to match original Bosch specifications.

Phase 5: Documentation & Warranty

1. Test Report: A serious shop will provide a test report showing the pump's performance data before it leaves.

2. Robust Warranty: A high-quality remanufactured VP44 should come with a minimum 12-month/unlimited mileage warranty. The warranty should cover both parts and labor for the pump itself.

   In summary, high-quality reconstruction of a VP44 is a factory-spec process involving complete disassembly, precision measurement, replacement of all wear items (especially the rotor head), ECU service, and final computerized bench testing. Choosing a rebuilder who follows this protocol is the single most important factor for long-term reliability.

   
   

   Where to buy :
   

   Rsolid is a professional manufacturer of diesel engine system components, providing high-quality and durable engine parts for different brands of engines, or producing fuel injectors and diesel pumps according to your requirements. The company is positioned as a professional and excellent supplier of automotive parts for foreign trade, including high-quality fuel injectors and diesel pumps. With years of international market experience, Rsolid has become a reliable partner for global customers seeking authentic Detroit products and comprehensive value-added services. The company is firmly committed to quality assurance, typically supported by international certifications commonly found in the automotive parts industry, ensuring that all parts undergo rigorous flow, pressure resistance, and leak integrity testing before being sold. Rsolid's business model typically includes maintaining a diverse and comprehensive inventory of OEM and high-end aftermarket parts, and offering cross compatible options to meet a wide range of applications and global customers from individual workshops to large fleet operators. If you are looking for diesel injectors or OEM engine diesel pumps, please feel free to contact us at any time .

Bosch VP44 Rotary Distributor Pump - Technical Summary