Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual - part 100
LU(STI)-2
General Description
LUBRICATION
1. General Description
A: SPECIFICATION
1. STI MODEL
Lubrication method
Forced lubrication
Oil pump
Pump type
Trochoid type
Number of teeth
Inner rotor
9
Outer rotor
10
Outer rotor diameter × thickness
mm (in)
78 × 11 (3.07 × 0.43)
Tip clearance between inner and outer
rotors
mm (in) Standard
0.04 — 0.14 (0.0016 — 0.0055)
Case clearance between outer rotor and
pump case
mm (in) Standard
0.10 — 0.175 (0.0039 — 0.0069)
Side clearance between inner rotor and
pump case
mm (in) Standard
0.02 — 0.07 (0.0008 — 0.0028)
Relief valve spring
Free length
mm (in)
73.7 (2.902)
Installed length
mm (in)
54.7 (2.154)
Load when installed
N (kgf, lbf)
93.1 (9.49, 20.93)
Performance
(Oil temperature 80°C
(176°F))
600 rpm
Discharge
pressure
kPa (kg/cm
2
, psi)
98 (1.0, 14)
Discharge
rate
L (US qt, Imp qt)/min.
6.4 (6.8, 5.6) or more
6,000 rpm
Discharge
pressure
kPa (kg/cm
2
, psi)
392 (4.0, 56.8)
Discharge
rate
L (US qt, Imp qt)/min.
63.0 (66.6, 55.4) or more
Relief valve working pressure
kPa (kg/cm
2
, psi)
538 (5.5, 78)
Oil filter
Filter type
Full-flow filter type
Filtration area
cm
2
(sq in)
Outer diameter: 68 mm (2.68 in) (Black)
800 (124)
Outer diameter: 67.4 mm (2.65 in) (Blue)
555 (86)
By-pass valve opening pressure
kPa (kg/cm
2
, psi)
160 (1.63, 23.2)
Outer diameter ×
width
mm (in)
Outer diameter: 68 mm (2.68 in) (Black)
68 × 65 (2.68 × 2.56)
Outer diameter: 67.4 mm (2.65 in) (Blue)
67.4 × 65.3 (2.65 × 2.57)
Installation screw specifications
M 20 × 1.5
Oil pressure
switch
Type
Immersed contact point type
Operating voltage — power consumption
12 V — 3.4 W or less
Warning light operating pressure
kPa (kg/cm
2
, psi)
14.7 (0.15, 2.1)
Proof pressure
kPa (kg/cm
2
, psi)
981 (10, 142) or more
Engine oil
Total capacity (at overhaul)
L (US qt, Imp qt)
5.0 (5.3, 4.4)
When replacing engine oil and oil filter
L (US qt, Imp qt)
4.3 (4.5, 3.8)
When replacing engine oil only
L (US qt, Imp qt)
4.0 (4.2, 3.5)