Bosch 0414755005 – The Pump That Maintains Volumetric Efficiency Through Temperature-Compensated Plunger Fit

In a high-pressure pump, the clearance between the plunger and the barrel determines the pump's volumetric efficiency. If the clearance is too large, the fuel leaks past the plunger, and the pump's flow rate is reduced. If the clearance is too small, the plunger sticks, and the pump fails. The clearance is affected by the temperature - the plunger and the barrel are made from different materials, and they expand at different rates. The 0414755005 is a Bosch pump that is designed with a temperature-compensated plunger fit - the plunger and the barrel are matched to each other so that the clearance is maintained across the full temperature range. It is the pump that keeps its volumetric efficiency, so the engine delivers its rated power, even when the pump is hot.

The plunger and the barrel are made from different materials - the plunger is made from a high-speed steel, and the barrel is made from a tool steel. The two materials have different coefficients of thermal expansion - the barrel expands more than the plunger, and the clearance increases with temperature. The increased clearance allows the fuel to leak past the plunger, and the pump's flow rate drops. The 0414755005 addresses this with a temperature-compensated plunger fit - the plunger and the barrel are matched to each other so that the clearance is maintained across the full temperature range. The plunger has a slightly larger diameter at the top than at the bottom - a taper that compensates for the differential expansion. The result is a clearance that is constant across the temperature range, and a volumetric efficiency that is maintained.

The 0414755005 uses a plunger with a taper - the plunger diameter is 0.003 mm larger at the top than at the bottom. The taper compensates for the differential expansion of the plunger and the barrel - when the pump is hot, the barrel expands more than the plunger, and the clearance increases. The taper ensures that the clearance is maintained at 3-5 µm across the full temperature range.

Pump type: High-pressure pump

Plunger diameter: 6.0 mm (nominal)

Plunger taper: 0.003 mm (top to bottom)

Clearance: 3-5 µm (across temperature range)

Number of plungers: 4

Maximum injection pressure: 1,800 bar

Operating temperature: –40 °C to +120 °C

The most common failure is a worn plunger - the plunger wears, and the clearance increases. The symptom is a loss of power at high load - the pump's flow rate is reduced. The second most common failure is a sticking plunger - the plunger becomes stuck in the barrel.

Q1: How can I tell if my pump is losing volumetric efficiency? → The engine loses power at high load, especially when the engine is hot.

Q2: Can I use a standard pump as a replacement? → A standard pump may not have the temperature-compensated plunger fit.

Q3: Why does my engine lose power when it is hot? → The plunger clearance may be increasing with temperature - the pump is losing its flow.

Q4: What is the most common cause of pump failure? → Worn plunger - the plunger wears, and the clearance increases.

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

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

 

To make your purchasing experience smooth and easy, we offer a variety of secure payment options:

We're here to make your order process worry-free - choose the payment method that works best for you!

 

 

Hot Tags: bosch 0414755005 – the pump that maintains volumetric efficiency through temperature-compensated plunger fit, China bosch 0414755005 – the pump that maintains volumetric efficiency through temperature-compensated plunger fit manufacturers, suppliers, factory, 0445020530, 1042300FE010, Bosch for Mercedes, Euro 6 Tier 4 Final, for Iveco Euro Cargo, High pressure fuel pump