Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Impreza 2001-2002.2004-2007 Approved Subaru Impreza 2004 WRX STi 08. MECHANISM AND FUNCTION 28. LUBRICATION (STi) 03. Oil Pump
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W1860BE.book Page 5 Tuesday, January 28, 2003 11:01 PM
OIL PUMP
LUBRICATION
3. Oil Pump
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 rotat-
ed, 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 carried from the inlet port to the discharge port. As the pump rotates, the space car-
rying the oil becomes smaller, thus the oil is pressurized and discharged from the outlet port.
A relief valve is built in the oil pump at its discharge side. When the oil pressure becomes 588 kPa
(6.0 kgf/cm2, 85 psi) or higher, the relief valve regulates the pressure by sending excessive oil back
to the inlet side.
(2)
(1) (4) (1)
(2)
(5)
(3)
(9) (8) (7) (6)
LU-00058
(1) Inner rotor (6) Plug
(2) Outer rotor (7) Gasket
(3) Oil seal (8) Relief valve spring
(4) Oil pump case (9) Relief valve
(5) Oil pump cover
LU(STi)-5
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