Oil Pump - Subaru SVX 1992 Manual

2-4 [nn3oo] ENGINE LUBRICATION SYSTEM
3 . Oil Pump
Inner rotor
/^
I
Oil pump case
Outer rotor
Front oil seal
Relief valve
Washer
Relief valve
Washer
Plug
0
C2-069
Fig. 3
The trochoid oil pump utilizes an internal oil circulation
design which is accomplished by an inner rotor and
outer rotor built into the pump body . When the inner
rotor is driven by the crankshaft, the outer rotor is
rotated, changing the size of the space between the two
rotors (because of the different number of teeth used on
the rotors) .
Oil pump cover
-o~
Outer rotor
i
o
Inner rotor o
l~ o
Engine oil is sucked into the large space created near
the inlet side . It is then carried over to the discharge port
and discharged due to it being gradually pressurized as
the space carrying it becomes smaller . Oil pressure is
regulated by the relief valve located on the discharge
side . Excess oil is directly returned to the suction port .
4