Oil Pump - Subaru 2002 Impreza Service Manual

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The oil pump is a trochoid rotor type consisting of an inner rotor and outer rotor assembled with

each other in a pump body. When the inner rotor is driven by the crankshaft, the outer rotor is ro-

tated, changing the space between it and the inner rotor. The change in the space occurs because

of the difference in the number of teeth between the rotors.

Engine oil is drawn into the large space created near the inlet of the pump. It is then carried to

the discharge port. As the pump rotates, the space carrying the oil becomes smaller, thus the oil

is pressurized and discharged from the outlet port. Oil pressure is regulated by the relief valve built

into the pump. Excess oil is directly returned to the inlet port.

Oil pump cover

(8) Relief valve spring

(9) Relief valve

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