Bosch 313GC5230MX – The CP3 Pump That Maintains Bearing Lubrication Through Optimised Oil Gallery Design

In a Bosch CP3 high-pressure pump, the bearings that support the drive shaft and the camshaft rely on a continuous supply of fuel for lubrication - the fuel is the lubricant, and it is delivered to the bearings through a series of oil galleries. The fuel flow to the bearings must be sufficient to maintain a film of lubricant between the bearing surfaces, but it must not be so high that it creates a pressure drop in the pump's inlet. If the oil galleries are not optimised, the bearings can become starved of lubricant, and they will fail. The 313GC5230MX is a Bosch CP3 pump that is designed with an optimised oil gallery design that maintains a consistent flow of fuel to the bearings, regardless of the pump speed or the fuel temperature. It is the pump that keeps the bearings lubricated, so the shaft rotation is smooth and the pump's service life is extended.

The CP3 pump uses fuel as the lubricant for its bearings - the fuel is drawn from the inlet and is directed to the bearings through a series of drilled passages. The flow of fuel to the bearings is determined by the size of the passages and the pressure at the inlet. If the passages are too small, the bearings are starved of lubricant, and the bearing surfaces wear. If the passages are too large, the fuel flow to the bearings is excessive, and the pressure at the pump inlet drops. The 313GC5230MX addresses this with an optimised oil gallery design that is matched to the pump's speed range and the fuel's viscosity. The oil galleries are sized to provide a constant flow of fuel to the bearings, and the flow is verified on each pump during manufacturing.

The 313GC5230MX uses oil galleries that are sized to provide a constant flow of fuel to the bearings. The flow is calculated using a mathematical model of the pump's hydraulics - the model accounts for the inlet pressure, the fuel viscosity, and the bearing clearances. The galleries are sized to provide a flow that is sufficient to maintain a film of lubricant, but not so high that it creates a pressure drop. The galleries are drilled to a tolerance of ±0.05 mm, and the flow is verified on each pump using a flow meter.

The most common failure is a bearing seizure - the bearing starves of lubricant, and the shaft locks. The symptom is a sudden loss of power and a screeching noise from the pump.

Installing the 313GC5230MX 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 pump bearing is failing? → The pump makes a screeching noise, and the engine loses power.

Q2: Can I use a standard pump as a replacement? → A standard pump may not have the optimised oil galleries.

Q3: Why does my pump make a screeching noise? → The bearing may be starved of lubricant - the oil gallery is blocked or undersized.

Q4: What is the most common cause of pump failure? → A bearing seizure - the bearing starves of lubricant.

Q5: Does the pump work with biodiesel? → Yes, but biodiesel has a different viscosity, which can affect the bearing flow.

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

 

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