CAT 2641A407 High-Pressure Fuel Pump – Advanced Hydraulic Sealing and Leakage Control for C13/C15 Common-Rail Systems
1. Product:2641A407
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
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Product Introduction
In high-pressure fuel pumps, the difference between a new pump and a worn pump is most visible in its internal leakage-the fuel that bypasses the plunger-barrel interface and returns to the low-pressure side. This leakage, while necessary for lubrication, represents a loss of hydraulic efficiency that grows as the pump accumulates operating hours. Every increase in leakage reduces the volumetric efficiency, requiring the pump to work harder to maintain rail pressure and generating additional heat in the fuel. Over time, excessive leakage leads to rail pressure instability, reduced power, and eventual pump failure. The CAT 2641A407 addresses this through an advanced hydraulic sealing system that combines a micro-grooved plunger surface with a precision-honed barrel, maintaining a consistent sealing clearance of 0.002–0.004 mm for over 8,000 hours. The result is a pump that limits the leakage increase to less than 15% over its service life-a 40% improvement over standard pumps-providing consistent rail pressure and extended service intervals.
Flow Stability – The Foundation of Consistent Injection
The 2641A407 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 sealing system ensures that it remains above 89% for over 8,000 hours.
Material and Surface Engineering – Built for Longevity
The 2641A407's plungers are manufactured from a high-speed steel (HSS) grade with a hardness of 62 HRC, providing a tough core that resists the high-contact stresses of the cam-plunger interface. The plunger surface is finished with a micro-grooved pattern created through a precision grinding process, and coated with a DLC (diamond-like carbon) layer with a hardness of 2,000 HV. The barrel is manufactured from a nitride-hardened steel with a surface hardness of 1,100 HV and a case depth of 0.025 mm, providing a wear-resistant sealing surface that complements the DLC coating.