Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 101
LU(STI)-6
General Description
LUBRICATION
(1)
Plug
(19) Rocker cover
(37) Clip (model with oil cooler)
(2)
Gasket
(20) Baffle plate
(38) Oil filter connector (model without
oil cooler)
(3)
Relief valve spring
(21) O-ring
(39) Plug (model without oil cooler)
(4)
Relief valve
(22) Oil strainer
(40) Oil cooler hose B (model with oil
cooler)
(5)
Front oil seal
(23) Gasket
(41) Oil cooler hose C (model with oil
cooler)
(6)
Oil pump case
(24) Oil level gauge guide
(7)
Inner rotor
(25) Oil pan
Tightening torque: N·m (kgf-m, ft-lb)
(8)
Outer rotor
(26) Oil level gauge
T1: 5 (0.5, 3.7)
(9)
Oil pump cover
(27) Drain plug gasket
T2: 5.4 (0.6, 4.0)
(10) Oil filter
(28) Drain plug
T3: 6.4 (0.7, 4.7)
(11) Oil cooler connector (model with
oil cooler)
(29) Gasket (model with oil cooler)
T4: 10 (1.0, 7.0)
(12) Oil cooler pipe (model with oil
cooler)
(30) Oil filler cap
T5: 25 (2.5, 18.4)
(13) Oil cooler (model with oil cooler)
(31) Seal
T6: 44 (4.5, 32.5)
(14) O-ring
(32) O-ring
T7: 45 (4.6, 33.2)
(15) Oil pump ASSY
(33) Gasket
T8: 46.5 (4.7, 34.3)
(16) Oil pressure switch
(34) O-ring
T9: 54 (5.5, 39.8)
(17) Oil filler duct
(35) Nipple (model with oil cooler)
T10: 69 (7.0, 50.9)
(18) O-ring
(36) Oil cooler hose A (model with oil
cooler)
T11: 70 (7.1, 51.6)
LU(STI)-7
General Description
LUBRICATION
2. OIL PIPE
(1)
Oil inlet pipe
(8)
Cylinder head RH
Tightening torque: N·m (kgf-m, ft-lb)
(2)
Turbocharger oil pipe
(9)
Cylinder head LH
T1: 6.4 (0.7, 4.7)
(3)
Oil pipe RH
(10) Front camshaft cap RH
T2: 16 (1.6, 11.8)
(4)
Union bolt with filter (with protru-
sion)
(11) Front camshaft cap LH
T3: 20 (2.0, 14.8)
(5)
Union bolt without filter (without
protrusion)
(12) Turbocharger
T4: 29 (3.0, 21.4)
(6)
Gasket
(13) Union bolt without filter (with pro-
trusion)
(7)
Oil pipe LH
LU-02727
(3)
(4)
(5)
(10)
T1
T4
T4
(4)
(5)
(11)
T4
T4
(2)
(5)
T1
T4
(1)
(13)
(12)
T2
T3
(6)
(6)
(6)
(6)
(6)
(6)
(6)
(7)
(8)
(9)
LU(STI)-8
General Description
LUBRICATION
C: CAUTION
• Prior to starting work, pay special attention to the following:
1. Always wear work clothes, a work cap, and protective shoes. Additionally, wear a helmet, protective
goggles, etc. if necessary.
2. Protect the vehicle using a seat cover, fender cover, etc.
3. Prepare the service tools, clean cloth, containers to catch grease and oil, etc.
• Prepare a container and cloth when performing work which oil possibly spills. If oil spills, wipe it off imme-
diately to prevent from penetrating into floor or flowing out for environmental protection.
• Vehicle components are extremely hot immediately after driving. Be wary of receiving burns from heated parts.
• When performing a repair, identify the cause of trouble and avoid unnecessary removal, disassembly and
replacement.
• Before disconnecting connectors of sensors or units, be sure to disconnect the ground cable from battery.
• Always use the jack-up point when the shop jacks or rigid racks are used to support the vehicle.
• Remove contamination including dirt and corrosion before removal, installation, disassembly or assembly.
• Keep the removed parts in order and protect them from dust and dirt.
• All removed parts, if to be reused, should be reinstalled in the original positions with attention to the correct
directions, etc.
• Bolts, nuts and washers should be replaced with new parts as required.
• Be sure to tighten the fasteners including bolts and nuts to the specified torque.
• If the engine oil is spilt over exhaust pipe or the under cover, wipe it off with cloth to avoid emitting smoke
or causing a fire.
• Follow all government and local regulations concerning disposal of refuse when disposing of oil.
D: PREPARATION TOOL
1. SPECIAL TOOL
2. GENERAL TOOL
ILLUSTRATION
TOOL NUMBER
DESCRIPTION
REMARKS
18332AA000
OIL FILTER
WRENCH
Used for removing and installing oil filter (black).
(Outer diameter: 68 mm (2.68 in))
499587100
OIL SEAL
INSTALLER
Used for installing oil seal into oil pump.
TOOL NAME
REMARKS
Oil filter wrench (65/67 mm 14 Flutes)
Used for removing and installing oil filter (blue).
(Outer diameter: 67.4 mm (2.65 in))
Circuit tester
Used for measuring resistance and voltage.
ST18332AA000
ST-499587100
LU(STI)-9
Oil Pressure System
LUBRICATION
2. Oil Pressure System
A: WIRING DIAGRAM
Oil pressure warning system <Ref. to WI-150, WIRING DIAGRAM, Oil Pressure Warning Light System.>
7
3
1 2 3 4 5 6 7 8 9 10 11
12 13 14 15 16 17 18 19 20 21 22
23 24 25 26 27 28 29 30 31 32 33
34 35
42 43
36 37 38 39
48 49 50 51 52 53 54
40 41
44 45
46 47
i1
5 6 7 8
2
1
9
4
3
10
24
22
23
25
27
26
28
11 12 13
14 15 16
17 18 19 20 21
i10
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
E11
2
19
1
E2
B21
B36
i1
i10
2
B21
LU-03150
FB-36
F/B FUSE NO. 5
(IG)
TO POWER SUPPLY CIRCUIT
COMBINATION
METER
OIL PRESSURE W
ARNING
LIGHT
OIL
PRESSURE
SWITCH
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