Genuine BMW 335i Oil Pump

BMW 335i Oil Pump Parts Questions & Experts Answers

• Oil Pump
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  Q: How does the volumetric-flow controlled oil pump optimize oil delivery and reduce engine fuel consumption on BMW 335i?

  A: The volumetric-flow controlled oil pump delivers only the necessary amount of oil, preventing surplus in low load operating ranges, which reduces engine fuel consumption and slows oil wear. Designed with sliding vane valves, the pump features an off-center positioned shaft and rotor within a pivoting housing, causing the vanes to displace radially during rotation and form chambers of varying volume. As the pump rotates, oil pressure acts on the control piston against the compression spring, allowing the beveled piston to adjust the pivoting housing's position. When centered, the intake and output chamber volume changes are minimal, resulting in low oil delivery; when off-center, these changes are greater, leading to higher oil delivery. An increase in engine oil demand, such as during VANOS operation, causes a drop in lubricating system pressure, which allows the compression spring to push the beveled piston further off-center, increasing oil volume. Conversely, as engine oil pressure rises and demand decreases, the process reverses. Cautions include reading battery disconnection warnings before disconnecting, avoiding steel fasteners on aluminum-magnesium alloy components to prevent corrosion, replacing aluminum bolts after loosening, adhering to torque instructions for aluminum fasteners, and covering the alternator with a shop towel to protect it from oil drips.