Subaru Legacy IV (2008 year). Service manual - part 86

CO(H4SO)-30

Engine Cooling System Trouble in General

COOLING

LU(H4SO)-2

General Description

LUBRICATION

1. General Description

A: SPECIFICATION

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)

Non-turbo model

76 × 10 (2.99 × 0.39)

Turbo model

78 × 10 (3.07 × 0.39)

Tip clearance between inner and outer 
rotors

Standard

mm (in)

0.04 — 0.14 (0.0016 — 0.0055)

Side clearance between inner rotor and 
pump case

Standard

mm (in)

0.02 — 0.07 (0.0008 — 0.0028)

Case clearance between outer rotor and 
pump case

Standard

mm (in) 0.10 — 0.175 (0.0039 — 0.0069)

Performance
(Oil temperature 80°C 
(176°F))

600 rpm

Discharge 
pressure

kPa (kg/cm

2

, psi)

98 (1.0, 14)

Discharge 
rate

2 (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

2 (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 (Overhaul)

2 (US qt, Imp qt)

5.0 (5.3, 4.4)

When replacing engine oil and oil filter

2 (US qt, Imp qt)

Non-turbo model: 4.2 (4.4, 3.7)

Turbo model: 4.3 (4.5, 3.8)

When replacing engine oil only

2 (US qt, Imp qt)

4.0 (4.2, 3.5)

LU(H4SO)-3

General Description

LUBRICATION

Recommended oil:

Oil complying with one of the following stan-
dards:

• For API standard, oil with SM “Energy Con-

serving” logo

• For ILSAC standard, oil with GF-4 “Star burst 

mark” label on the container

CAUTION:
It is acceptable to fill an engine with oil of an-
other brand when replacing the oil, but make
sure to use an oil with an API standard and SAE
viscosity number specified by Subaru.

NOTE:
• The proper viscosity oil helps the engine main-
tain its ideal temperature, and cranking speed in-
creased by reducing viscosity friction in hot
condition.
• If the vehicle is used in regions of high tempera-
tures or in other severe environments, use oil with
the viscosities shown below.
API standard: SM or SL
SAE viscosity No.: 30, 40, 10W-50, 20W-40, 20W-
50

(1) SAE viscosity No. and applicable temperature

(2) Recommended

( C)

-30 -20 -15

0

15

30

40

-22

-4

5

32

59

86 104

SAE (1)

( F)

10W-30, 10W-40 , 10W-50

5W-30 (2)

LU-02329

LU(H4SO)-4

General Description

LUBRICATION

B: COMPONENT

• NON-TURBO MODEL

(1)

Plug

(15)

Gasket

(29)

Rocker cover

(2)

Gasket

(16)

Oil filler cap

(30)

O-ring

(3)

Relief valve spring

(17)

O-ring

(31)

Oil filter connector

(4)

Relief valve

(18)

Baffle plate

(32)

Plug

(5)

Front oil seal

(19)

O-ring

 

(6)

Oil pump case

(20)

Oil strainer

Tightening torque:N·m (kgf-m, ft-lb)

(7)

Inner rotor

(21)

Oil level gauge guide

T1: 5 (0.5, 3.7)

(8)

Outer rotor

(22)

O-ring

T2: 6.4 (0.7, 4.7)

(9)

Oil pump cover

(23)

Oil pan

T3: 10 (1.0, 7.4)

(10)

Oil filter

(24)

Oil level gauge

T4: 25 (2.5, 18.4)

(11)

O-ring

(25)

Drain plug

T5: 44 (4.5, 32.5)

(12)

Oil pump ASSY

(26)

Drain plug gasket

T6: 5.4 (0.6, 4.0)

(13)

Oil pressure switch

(27)

Gasket

T7: 45 (4.6, 33.2)

(14)

Oil filler duct

(28)

Seal

T8: 70 (7.1, 51.6)

(12)

(11)

T4

T2

T6

T2

T1

T5

T5

T2

T2

(13)

(9)

(8)

(7)

(6)

(27)

(17)

(15)

(14)

(29)

(16)

(24)

(30)

(23)

(25)

(26)

(5)

(4)

(3)

(2)

(1)

(22)

(21)

T2

(28)

T3

T2

(20)

(19)

(18)

T2

(32)

T8

(31)

(10)

T7

LU-02471