CAT 2641A405 High-Pressure Fuel Pump – Advanced Lubrication and Wear Control for Extended Service Life in C13/C15 Common-Rail Systems
1. Product:2641A405
2. Compatible Equipment: Diesel Fuel Injection Systems
3. Manufacturer: Aftermarket OEM Replacement
4. Condition: Brand New, Fully Tested
5. Origin: ABOSEDE Diesel
6. Shipping period: 3-5 business days
7. Payment terms: T/T, Western Union, PayPal
- Fast Delievery
- Quality Assurance
- 24/7 Customer Service
Product Introduction
In the high-pressure fuel pump, the plunger-barrel interface operates under extreme conditions-pressures exceeding 1,600 bar, sliding velocities of up to 5 m/s, and fuel temperatures that can reach 120°C. The only barrier between metal-to-metal contact is a microscopic film of fuel, which acts as both a lubricant and a sealing medium. If this film breaks down due to contamination, viscosity loss, or excessive load, the plunger and barrel experience adhesive wear (scuffing), which rapidly increases the clearance and reduces the pump's volumetric efficiency. The CAT 2641A405 addresses this through an advanced lubrication and wear control system that combines a micro-grooved plunger surface with a controlled-leakage sealing design, ensuring a consistent lubricating film across the full operating range. The result is a pump that maintains its volumetric efficiency above 89% for over 8,000 hours-a 30% improvement over standard pumps, significantly extending the service interval in heavy-haul applications.
Plunger Lubrication – The Science of Boundary Film Control
The 2641A405's plunger surface is engineered to maintain a consistent lubricating film under all operating conditions. Key design features include:
Micro-grooved surface: Helical pattern with a depth of 0.5 µm, providing a controlled leakage path that distributes the lubricating film evenly and prevents dry running
DLC coating: Diamond-like carbon with a hardness of 2,000 HV, providing a low-friction, wear-resistant surface that maintains the film integrity
Barrel finish: Precision-honed to Ra ≤ 0.04 µm, providing a smooth sealing surface that complements the plunger coating
Clearance: 0.002–0.004 mm (dynamically matched with laser measurement)
Lubrication film thickness: Maintained at 0.001–0.002 mm under all operating conditions
Flow Stability – The Foundation of Consistent Injection
The 2641A405 uses a cam-driven radial three-plunger design with plungers spaced at 120° intervals, providing overlapping pressure strokes that minimise the flow interruption between plunger events. The flow ripple is measured at 3.5% at full load-a 45% improvement over two-plunger designs. The pump's volumetric efficiency is rated at 92% when new, and the advanced lubrication system ensures that it remains above 89% for over 8,000 hours.