1999 SUBARU LEGACY Service Repair Manual

B: 2500 cc MODEL
Lubrication methodForced lubrication
Oil pumpPump type Trochoid type
Number of teethInner rotor 9
Outer rotor 10
Outer rotor diameter´thickness 78´10 mm (3.07´0.39 in)
Tip clearance between inner and outer rotorSTANDARD 0.04 Ð 0.14 mm (0.0016 Ð 0.0055 in)
LIMIT 0.18 mm (0.0071 in)
Side clearance between inner rotor and pump
caseSTANDARD 0.02 Ð 0.07 mm (0.0008 Ð 0.0028 in)
LIMIT 0.15 mm (0.0059 in)
Case clearance between outer rotor and
pump caseSTANDARD 0.10 Ð 0.175 mm (0.0039 Ð 0.0069 in)
LIMIT 0.20 mm (0.0079 in)
Capacity at
80ÉC (176ÉF)600 rpm Discharge- pressure 98 kPa (1.0 kg/cm
2, 14 psi) or more
- quantity 4.6(4.9 US qt, 4.0 Imp qt)/min.
5,000 rpm Discharge- pressure 294 kPa (3.0 kg/cm
2, 43 psi) or more
- quantity 47.0(12.4 US gal, 10.3 Imp gal)/min.
Relief valve operation pressure 588 kPa (6.0 kg/cm
2, 85 psi)
Oil filterTypeFull-flow filter type
Filtration area 1,000 cm
2(155 sq in)
By-pass valve opening pressure 157 kPa (1.6 kg/cm2, 23 psi)
Outer diameter´width 80´70 mm (3.15´2.76 in)
Oil filter to engine thread size M 20´1.5
Oil pressure
switchType Immersed contact point type
Working voltage Ð wattage 12 V Ð 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/cm2, 142 psi)
Oil pan capacity4.5(4.8 US qt, 4.0 Imp qt)
3
[S1B0]2-4SPECIFICATIONS AND SERVICE DATA
1. Specifications

1. Lubrication System
A: 2200 cc MODEL
B2M2235A
(1) Plug
(2) Washer
(3) Relief valve spring
(4) Relief valve
(5) Oil seal
(6) Oil pump case
(7) Inner rotor
(8) Outer rotor
(9) Oil pump cover
(10) Oil filter
(11) O-ring
(12) Oil pump ASSY(13) Oil pressure switch
(14) Oil filler duct
(15) O-ring
(16) Oil filler cap
(17) O-ring
(18) Baffle plate
(19) O-ring
(20) Oil strainer
(21) Oil level gauge guide
(22) O-ring
(23) Oil pan
(24) Oil level gauge(25) Drain plug
(26) Metal gasket
Tightening torque: N´m (kg-m, ft-lb)
T1:
5 (0.5, 3.6)
T2:5+1/þ0(0.5+0.1/þ0, 3.6+0.7/þ0)
T3:6.4 (0.65, 4.7)
T4:9.8 (1.0, 7.0)
T5:44.1±3.4 (4.5±0.35, 32.5±2.5)
4
2-4[C1A0]COMPONENT PARTS
1. Lubrication System

B: 2500 cc MODEL
H2M2426A
(1) Plug
(2) Washer
(3) Relief valve spring
(4) Relief valve
(5) Oil seal
(6) Oil pump case
(7) Inner rotor
(8) Outer rotor
(9) Oil pump cover
(10) Oil filter
(11) Plug
(12) Gasket(13) Oil filter connector
(14) O-ring
(15) Oil pump ASSY
(16) Oil pressure switch
(17) Oil filler duct
(18) O-ring
(19) Cylinder head cover
(20) Baffle plate
(21) O-ring
(22) Oil strainer
(23) Gasket
(24) Oil level gauge guide(25) Oil pan
(26) Oil level gauge
(27) Metal gasket
(28) Drain plug
Tightening torque: N´m (kg-m, ft-lb)
T1:
5 (0.5, 3.6)
T2:5+1/þ0(0.5+0.1/þ0, 3.6+0.7/þ0)
T3:6.4 (0.65, 4.7)
T4:10 (1.0, 7.0)
T5:44.1±3.4 (4.5±0.35, 32.5±2.5)
5
[C1B0]2-4COMPONENT PARTS
1. Lubrication System

1. Oil Pump
A: REMOVAL
1) Disconnect battery ground cable.
G6M0095
2) Lift-up the vehicle.
3) Remove under cover.
B2M0014
4) Drain coolant.
B2M0015A
5) Remove radiator.
S2M0033
6) Lower the vehicle.
7) Remove crankshaft position sensor.
B2M1252A
8) Remove camshaft position sensor.
G2M0417
9) Remove V-belts.
G2M0286
10) Remove rear side V-belt tensioner.
S2M0113
6
2-4[W1A0]SERVICE PROCEDURE
1. Oil Pump

11) Remove crankshaft pulley by using ST.
ST 49997700 CRANKSHAFT PULLEY
WRENCH
S2M0114
12) Remove water pump.
S2M0022
13) Remove timing belt guide. (MT vehicles only)
S2M0115
14) Remove crankshaft sprocket.
S2M0116
15) Remove bolts which install oil pump onto cyl-
inder block.
S2M0117
16) Remove oil pump by using flat bladed screw-
driver.
CAUTION:
Be careful not to scratch mating surfaces of
cylinder block and oil pump.
S2M0722A
7
[W1A0]2-4SERVICE PROCEDURE
1. Oil Pump

B: DISASSEMBLY
Remove screws which secure oil pump cover and
disassemble oil pump.
Inscribe alignment marks on inner and outer rotors
so that they can be replaced in their original posi-
tions during reassembly.
CAUTION:
Before removing relief valve, loosen plug when
removing oil pump from cylinder block.
B2M1912A
(A) Oil seal
(B) Pump case
(C) Inner rotor
(D) Outer rotor
(E) Pump cover
(F) Relief valve
(G) Relief spring
(H) Plug
(I) Washer
C: INSPECTION
1. TIP CLEARANCE
Measure the tip clearance of rotors. If the clear-
ance exceeds the limit, replace rotors as a
matched set.
Tip clearance:
Standard
0.04 Ð 0.14 mm (0.0016 Ð 0.0055 in)
Limit
0.18 mm (0.0071 in)
B2M1913A
2. CASE CLEARANCE
Measure the clearance between the outer rotor
and the cylinder block rotor housing. If the clear-
ance exceeds the limit, replace the rotor.
Case clearance:
Standard
0.10 Ð 0.175 mm (0.0039 Ð 0.0069 in)
Limit
0.20 mm (0.0079 in)
B2M1914A
8
2-4[W1B0]SERVICE PROCEDURE
1. Oil Pump

3. SIDE CLEARANCE
Measure clearance between oil pump inner rotor
and pump cover. If the clearance exceeds the limit,
replace rotor or pump body.
Side clearance:
Standard
0.02 Ð 0.07 mm (0.0008 Ð 0.0028 in)
Limit
0.15 mm (0.0059 in)
B2M1915
4. OIL RELIEF VALVE
Check the valve for fitting condition and damage,
and the relief valve spring for damage and deterio-
ration. Replace the parts if defective.
Relief valve spring:
Free length; 71.8 mm (2.827 in)
Installed length; 54.7 mm (2.154 in)
Load when installed; 77.08 N (7.86 kg,
17.33 lb)
5. OIL PUMP CASE
Check the oil pump case for worn shaft hole,
clogged oil passage, worn rotor chamber, cracks,
and other faults.
6. OIL SEAL
Check the oil seal lips for deformation, hardening,
wear, etc. and replace if defective.
D: ASSEMBLY
1) Install front oil seal by using ST.
ST 499587100 OIL SEAL INSTALLER
CAUTION:
Use a new oil seal.
H2M2423
2) Install inner and outer rotors in their original
positions.
3) Install oil relief valve and relief spring.
4) Install oil pump cover.
Tightening torque:
T1:5Ð6N´m(0.5 Ð 0.6 kg-m, 3.6 Ð 4.3
ft-lb)
T2: 40.7 Ð 47.6 N´m (4.15 Ð 4.85 kg-m,
30.0 Ð 35.1 ft-lb)
B2M1912B
9
[W1D0]2-4SERVICE PROCEDURE
1. Oil Pump

E: INSTALLATION
Installation is in the reverse order of removal.
Observe the following:
1) Apply fluid packing to matching surfaces of oil
pump.
Fluid packing:
THREE BOND 1215 or equivalent
H2M2424A
2) Replace O-ring with a new one.
3) Apply a coat of engine oil to the inside of the oil
seal.
S2M0118A
4) Be careful not to scratch oil seal when installing
oil pump on cylinder block.
5) Position the oil pump, aligning the notched area
with the crankshaft, and push the oil pump straight.
CAUTION:
Make sure the oil seal lip is not folded.
6) Install oil pump.
Tightening torque:
6.4 N´m (0.65 kg-m, 4.7 ft-lb)
S2M0120A
2. Oil Pan and Oil Strainer
A: REMOVAL
1) Disconnect battery ground cable.
G6M0095
2) Remove front wheels.
3) Remove air intake duct and air cleaner assem-
bly. (2200 cc California spec. vehicles)
B2M2771
4) Remove air intake duct and air intake chamber.
(Except 2200 cc California spec. vehicles)
B2M2772
10
2-4[W1E0]SERVICE PROCEDURE
2. Oil Pan and Oil Strainer