Subaru Legacy III (2000-2003 year). Manual - part 82

LU(H4SO)-2

LUBRICATION

GENERAL DESCRIPTION

1. General Description

A: SPECIFICATIONS

Lubrication method

Forced lubrication

Oil pump

Pump type

Trochoid type

Number of teeth

Inner rotor

9

Outer rotor

10

Outer rotor diameter 

×

 thickness

78 

×

 7 mm (3.07 

×

 0.28 in)

Tip clearance between inner and outer rotor

STANDARD

0.04 — 0.14 mm (0.0016 — 0.0055 in)

LIMIT

0.18 mm (0.0071 in)

Side clearance between inner rotor and pump 
case

STANDARD

0.02 — 0.07 mm (0.0008 — 0.0028 in)

LIMIT

0.12 mm (0.0047 in)

Case clearance between outer rotor and pump 
case

STANDARD

0.10 — 0.175 mm (0.0039 — 0.0069 in)

LIMIT

0.20 mm (0.0079 in)

Capacity at
80

°

C (176

°

F)

600 rpm

- Discharge pressure

98 kPa (1.0 kg/cm

2

, 14 psi)

- Discharge quantity

3.2 

2

 (3.4 US qt, 2.8 Imp qt)/min.

5,000 rpm

- Discharge pressure

294 kPa (3.0 kg/cm

2

, 43 psi)

- Discharge quantity

32.6 

2

 (8.61 US gal, 7.17 Imp gal)/min.

Relief valve operation pressure

490 kPa (5.0 kg/cm

2

, 71 psi)

Oil filter

Type

Full-flow filter type

Filtration area

760 cm

2

 (118 sq in)

By-pass valve opening pressure

157 kPa (1.6 kg/cm

2

, 22.7 psi)

Outer diameter 

×

 width

80 

×

 75 mm (3.15 

×

 2.95 in)

Installation screw type

M 20 

×

 1.5

Oil pressure 
switch

Type

Immersed contact point type

Working voltage — wattage

12 V — 3.4 W or less

Warning light activation pressure

14.7 kPa (0.15 kg/cm

2

, 2.1 psi)

Proof pressure

More than 981 kPa (10 kg/cm

2

, 142 psi)

Oil capacity (when replacing oil) 

Approx. 4.0 

2

 (4.2 US qt, 3.5 Imp qt)

LU(H4SO)-3

LUBRICATION

GENERAL DESCRIPTION

B: COMPONENT

(1) Plug

(13) Oil pressure switch

(25) Drain plug

(2) Gasket

(14) Oil filler duct

(26) Metal gasket

(3) Relief valve spring

(15) O-ring

(27) Gasket

(4) Relief valve

(16) Oil filler cap

(5) Oil seal

(17) O-ring

Tightening torque: N·m (kgf-m, ft-lb)

(6) Oil pump case

(18) Baffle plate

T1: 5 (0.5, 3.6)

(7) Inner rotor

(19) O-ring

T2: 6.4 (0.65, 4.7)

(8) Outer rotor

(20) Oil strainer

T3: 10 (1.0, 7.2)

(9) Oil pump cover

(21) Oil level gauge guide

T4: 25 (2.5, 18.1)

(10) Oil filter

(22) O-ring

T5: 44 (4.5, 33)

(11) O-ring

(23) Oil pan

(12) Oil pump ASSY

(24) Oil level gauge

LU-00168

( 1 )

( 2 )

( 3 )

( 4 )

( 5 )

( 6 )

( 7 )

( 8 )

( 9 )

(10)

(11)

(12)

(13)

(14)

(15)

(16)

(17)

(18)

(19)

(20)

(25)

(23)

(26)

(22)

(21)

(27)

(24)

T5

T5

T3

T1

T2

T2

T4

T2

T1

T1

T2

T1

LU(H4SO)-4

LUBRICATION

GENERAL DESCRIPTION

C: CAUTION

• Wear working clothing, including a cap, protec-
tive goggles, and protective shoes during opera-
tion.
• Remove dirt and corrosion before removal, in-
stallation or disassembly.
• Keep the disassembled parts in order and pro-
tect them from dust or dirt.
• Before removal, installation or disassembly, be
sure to clarify the failure. Avoid unnecessary re-
moval, installation, disassembly, and replacement.
• Be careful not to burn your hands, because each
part in the vehicle is hot after running.
• Be sure to tighten fasteners including bolts and
nuts to the specified torque.
• Place shop jacks or safety stands at the specified
points.
• Before disconnecting electrical connectors of
sensors or units, be sure to disconnect ground ca-
ble from battery.

LU(H4SO)-5

LUBRICATION

GENERAL DESCRIPTION

D: PREPARATION TOOL

ILLUSTRATION

TOOL NUMBER

DESCRIPTION

REMARKS

499977100

CRANKSHAFT 
PULLEY 
WRENCH

Used for stopping rotation of crankshaft pulley 
when loosening and tightening crankshaft pulley 
bolt. (2500 cc model)

499977400

CRANKSHAFT 
PULLEY 
WRENCH

Used for stopping rotation of crankshaft pulley 
when loosening and tightening crankshaft pulley 
bolt. (2000 cc model)

498547000

OIL FILTER 
WRENCH

Used for removing and installing oil filter.

499587100

OIL SEAL 
INSTALLER

Used for installing oil pump oil seal.

ST-499977100

ST-499977400

ST-498547000

ST-499587100