Volvo Penta 7421005584 – The Feed Pump That Maintains Inlet Pressure Through Wear-Compensated Gear Design

In a diesel fuel system, the feed pump draws fuel from the tank and delivers it to the high-pressure pump at a consistent inlet pressure. The pump is a gear pump-two gears rotate to create a vacuum at the inlet and a pressure at the outlet. The gears wear over time, increasing the clearance between the gears and the pump body, and the inlet pressure drops. The 7421005584 is a Volvo Penta feed pump that is designed with wear-compensated gears that maintain the inlet pressure across the service life-the gears are made from a hardened steel that resists wear, and the pump body is lined with a wear-resistant coating that maintains the clearance. It is the pump that delivers a consistent inlet pressure to the high-pressure pump, so the fuel delivery is accurate and the engine produces its rated power.

The feed pump is a gear pump-two gears rotate, and the fuel is carried from the inlet to the outlet. The clearance between the gear tips and the pump body determines the leakage-if the clearance is too large, the fuel leaks past the gears, and the inlet pressure drops. The clearance increases with wear-the gear tips wear against the pump body, and the gap increases. The 7421005584 addresses this with wear-compensated gears that maintain the inlet pressure. The gears are made from a hardened steel that resists wear-the steel has a hardness of 60 HRC, and it is ground to a surface finish of Ra 0.04 µm.

The 7421005584 is a direct replacement for the original feed pump used in Volvo Penta marine and industrial engines, commonly found in:

Volvo Penta D1 series – 1.0L marine diesel

Volvo Penta D2 series – 2.0L marine diesel

Volvo Penta D3 series – 2.4L marine diesel

Volvo Penta D4 series – 3.7L marine diesel

Volvo Penta D6 series – 5.5L marine diesel

Volvo Penta D9 series – 9.4L marine diesel

Volvo Penta D12 series – 12.0L marine diesel

Volvo Penta D16 series – 16.0L marine diesel

Cross-references include Volvo Penta 7421005584 and the original OEM feed pump used in the Volvo Penta marine engines listed above. The pump is designed for the 12 V and 24 V electrical systems used in these engines.

The 7421005584 uses gears that are made from a hardened steel-the steel has a hardness of 60 HRC, which is 10 % higher than the standard material. The gears are ground to a surface finish of Ra 0.04 µm, which reduces the wear rate. The pump body is lined with a wear-resistant coating that maintains the clearance-the coating is a nickel-based alloy that is applied by electroplating.

Installing the 7421005584 is a mechanical procedure-remove the old pump, clean the mounting surface, replace the O-ring, and torque the pump to 25 Nm. The pump must be primed before starting the engine.

Q1: How can I tell if my feed pump gears are worn? → The engine loses power at high load, and the rail pressure drops.

Q2: Can I use a standard feed pump as a replacement? → A standard pump may not have the wear-compensated gears.

Q3: Why does my engine lose power at high load? → The inlet pressure may be low-the feed pump gears are worn.

Q4: What is the most common cause of pump failure? → Worn gears-the gears wear, and the inlet pressure drops.

Q5: Does the pump work with biodiesel? → Yes, but biodiesel can affect the wear rate.

Q6: What is the warranty on the pump? → The pump has a 12-month warranty.

 

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