CAT 225-0567 High-Pressure Fuel Pump – Volumetric Efficiency Optimisation with Enhanced Plunger Seal Durability for C7/C9/C9.3 Common-Rail Systems
1. Product:225-0567
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 a high-pressure fuel pump, the theoretical fuel delivery is determined by the plunger diameter, the stroke length, and the cam profile. The actual delivery, however, is always lower-reduced by internal leakage past the plunger-bore interface and by fuel compressibility at elevated pressures. This difference, expressed as volumetric efficiency, is a direct measure of the pump's internal condition. A new pump typically achieves 90–92% volumetric efficiency, but as the plunger and bore wear, the leakage increases and the efficiency drops. Below 85%, the pump can no longer maintain the rail pressure at high load, triggering derates and power loss. The CAT 225-0567 addresses this through a hardened plunger and barrel set with a surface hardness of 1,100 HV and a case depth of 0.025 mm, combined with a micro-finished bore that maintains a consistent clearance of 0.002–0.004 mm. This combination reduces the wear rate by 40%, maintaining the volumetric efficiency above 88% for over 6,000 hours-significantly longer than standard pumps.
Volumetric Efficiency – The Key Performance Indicator
The 225-0567's volumetric efficiency is maximised through the following design features:
Plunger hardness: 1,100 HV (nitride-hardened steel)
Bore finish: Micro-honed to Ra ≤ 0.05 µm
Plunger-bore clearance: 0.002–0.004 mm
Volumetric efficiency (new): ≥ 90%
Volumetric efficiency (after 6,000 hours): ≥ 88%
Flow Calibration – The Pump's Performance Profile
The 225-0567 is a high-pressure fuel pump with the following specifications:
Type: Radial three-plunger, cam-driven
Flow rate: 55–75 L/h at 1,600 bar rail pressure
Maximum rail pressure: 1,600 bar
Plunger diameter: 6.0 mm
Plunger stroke: 4.0 mm
Drive: Camshaft-driven, gear-coupled
Fuel inlet pressure: 4–6 bar (from transfer pump)
Housing: Ductile iron with corrosion-resistant coating
Plunger material: Nitride-hardened steel (1,100 HV)