Oil Pump and Relief Valve

Oil Pump and Relief Valve




- The oil pump is a thin, large-diameter trochoid roller pump directly driven by the crankshaft. Its outer rotor and inner rotor are assembled with each other inside the rotor housing which is formed in the rear chain cover. The rotor housing is closed by the oil pump cover. The oil pump cover is made of aluminum die-casting and the outer rotor and inner rotor are made of sintered metal.
- When the pump discharge pressure exceeds a certain level, the relief valve opens and allows excess oil to return to the inlet of the pump. Two relief valves are installed; one in the oil pump cover and one in the oil pan upper.