Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service 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)
LU(STI)-3
General Description
LUBRICATION
2. EXCEPT FOR 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)
76 × 10 (2.99 × 0.39)
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.
4.6 (4.9, 4.0) or more
5,000 rpm
Discharge
pressure
kPa (kg/cm
2
, psi)
294 (3.0, 43)
Discharge
rate
L (US qt, Imp qt)/min.
47.0 (49.7, 41.4) or more
Relief valve working pressure
kPa (kg/cm
2
, psi)
588 (6.0, 85)
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)
4.2 (4.4, 3.7)
When replacing engine oil only
L (US qt, Imp qt)
4.0 (4.2, 3.5)
LU(STI)-4
General Description
LUBRICATION
Specified oil:
CAUTION:
• Use 5W-30 (synthetic oil).
• It is acceptable to fill an engine with oil of another brand when replacing the oil, but make sure to
use the following engine oil specified by Subaru.
NOTE:
The proper viscosity oil helps the engine maintain its ideal temperature, and cranking speed increased by re-
ducing viscosity friction in hot condition.
Engine oil standard
SAE viscosity No.
Those with the API standard SM
“Energy Conserving” or SN
“Resource Conserving” logo.
or
Those with the ILSAC standard GF-4
or GF-5 “starburst mark” displayed on
top of the container.
5W-30 (synthetic oil)
RM-00076
A
M
E
R
IC
A
N
PE
TROLEUM
IN
S
T
IT
U
T
E
FOR
GASOLINE
ENGINES
C E
R TIF E
I D
RM-00002
LU(STI)-5
General Description
LUBRICATION
B: COMPONENT
1. OIL PUMP AND OIL PAN
(15)
(14)
T5
T3
T2
T6
(9)
(8)
(7)
(6)
(16)
(26)
(5)
(4)
(3)
(2)
(1)
(19)
T9
(11)
(10)
(28)
(25)
(27)
(23)
T1
T3
(24)
(32)
T3
(20)
(31)
T4
(22)
(21)
T3
(18)
(17)
(30)
(33)
T3
(34)
T3
(35)
LU-03129
T7
(38)
T11
(39)
(37)
(29)
(13)
(12)
T3
(37)
(36)
(37)
(41)
(40)
(37)
(37)
T8
T10
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