SUBARU LEGACY 1997 Service Repair Manual

H3M1180A
B: IDENTIFICATION
When replacing a rear differential assembly, select the cor-
rect one according to the following table.
CAUTION:
Using the different rear differential assembly causes
the drive line and tires to “drag” or emit abnormal
noise when AWD is selected.
Gear ratio Part number Stamp on rear differential
2200 cc
MT3.900 27011AA330
B3M0124
2200 cc
AT
4.111 27011AA340
B3M0127
2500 cc
MT
2500 cc
AT4.444 27011AA410
B3M0421
3
3-4SPECIFICATIONS AND SERVICE DATA
1. AWD System

C: SERVICE DATA
Front and rear bearing preload at
companion flange bolt holeNew bearing19.6 — 28.4 N
(2.0 — 2.9 kg, 4.4 —6.4 lb)
Used bearing8.34 — 16.67 N
(0.85 — 1.70 kg, 1.87 — 3.75 lb)
Preload adjusting washer lengthPart No. Length
383705200 2.59 mm (0.1020 in)
383715200 2.57 mm (0.1012 in)
383725200 2.55 mm (0.1004 in)
383735200 2.53 mm (0.0996 in)
383745200 2.51 mm (0.0988 in)
383755200 2.49 mm (0.0980 in)
383765200 2.47 mm (0.0972 in)
383775200 2.45 mm (0.0965 in)
383785200 2.43 mm (0.0957 in)
383795200 2.41 mm (0.0949 in)
383805200 2.39 mm (0.0941 in)
383815200 2.37 mm (0.0933 in)
383825200 2.35 mm (0.0925 in)
383835200 2.33 mm (0.0917 in)
383845200 2.31 mm (0.0909 in)
Preload adjusting spacer lengthPart No. Length
383695201 56.2 mm (2.213 in)
383695202 56.4 mm (2.220 in)
383695203 56.6 mm (2.228 in)
383695204 56.8 mm (2.236 in)
383695205 57.0 mm (2.244 in)
383695206 57.2 mm (2.252 in)
4
3-4SPECIFICATIONS AND SERVICE DATA
1. AWD System

Pinion height adjusting shim thicknessPart No. Thickness
383495200 3.09 mm (0.1217 in)
383505200 3.12 mm (0.1228 in)
383515200 3.15 mm (0.1240 in)
383525200 3.18 mm (0.1252 in)
383535200 3.21 mm (0.1264 in)
383545200 3.24 mm (0.1276 in)
383555200 3.27 mm (0.1287 in)
383565200 3.30 mm (0.1299 in)
383575200 3.33 mm (0.1311 in)
383585200 3.36 mm (0.1323 in)
383595200 3.39 mm (0.1335 in)
383605200 3.42 mm (0.1346 in)
383615200 3.45 mm (0.1358 in)
383625200 3.48 mm (0.1370 in)
383635200 3.51 mm (0.1382 in)
383645200 3.54 mm (0.1394 in)
383655200 3.57 mm (0.1406 in)
383665200 3.60 mm (0.1417 in)
383675200 3.63 mm (0.1429 in)
383685200 3.66 mm (0.1441 in)
Side bearing standard width—20.00 mm (0.7874 in)
Side bearing retainer shim thicknessPart No. Thickness
383475201 0.20 mm (0.0079 in)
383475202 0.25 mm (0.0098 in)
383475203 0.30 mm (0.0118 in)
383475204 0.40 mm (0.0157 in)
383475205 0.50 mm (0.0197 in)
Crown gear to drive pinion backlash
Limit0.10—0.20 mm (0.0039—0.0079 in)
Crown gear runout on its back surface 0.05 mm (0.0020 in)
Oil capacity0.8
(0.8 US qt, 0.7 Imp qt)
5
3-4SPECIFICATIONS AND SERVICE DATA
1. AWD System

1. Rear Differential Mounting System
B3M0517A

1Plate


2Crossmember


3Rear bushing


4Differential mount lower bracket


5Differential mount bracket (OUTBACK model)


6Differential mount bracket


7Boss (OUTBACK model)


8Stopper (OUTBACK model)


9Stopper


10Front bushing


11Dynamic damper (2500 cc MT model)


12Differential mount front cover

13Differential front member
Tightening torque: N⋅m (kg-m, ft-lb)
T1: 20±5 (2.0±0.5, 14.5±3.6)
T2: 32±8 (3.3±0.8, 23.9±5.8)
T3: 64±8 (6.5±0.8, 47.0±5.8)
T4: 69±8 (7.0±0.8, 50.6±5.8)
T5: 69±10 (7.0±1.0, 51.0±7.2)
T6: 88±10 (9.0±1.0, 65.0±7.2)
T7: 98±10 (10.0±1.0, 72.0±7.2)
6
3-4COMPONENT PARTS
1. Rear Differential Mounting System

2. Propeller Shaft
G3M1018

1Front propeller shaft


2Center bearing


3Companion flange


4Stake nut


5Rear propeller shaft


6Rear differential
Tightening torque: N⋅m (kg-m, ft-lb)
T1: 27.9±4.4 (2.85±0.45, 20.6±3.3)
T2: 31±8 (3.2±0.8, 23.1±5.8)
T3: 52±5 (5.3±0.5, 38.3±3.6)
T4: 270±25 (27.5±2.5, 199±18)
7
3-4COMPONENT PARTS
2. Propeller Shaft

3. Rear Differential Assembly
B3M0130A

1Pinion crown gear set


2Pinion height adjusting washer


3Rear bearing


4Bearing preload adjusting spacer


5Bearing preload adjusting washer


6Differential carrier


7Front bearing


8Spacer


9Pilot bearing


10Front oil seal


11Companion flange


12Self-locking nut


13Side bearing


14O-ring

15Side bearing retainer shim


16Side bearing retainer


17Side oil seal


18Side gear thrust washer


19Side gear


20Pinion mate gear


21Pinion mate gear washer


22Pinion shaft lock pin


23Circlip


24Pinion mate shaft


25Air breather cap


26Stud bolt


27Oil filler plug


28Oil drain plug

29Rear cover


30Differential case
Tightening torque: N⋅m (kg-m, ft-lb)
T1: 10.3±1.5
(1.05±0.15, 7.6±1.1)
T2: 29.4±4.9
(3.00±0.50, 21.7±3.6)
T3: 44.1±3.9
(4.50±0.40, 32.5±2.9)
T4: 103.0±9.8
(10.50±1.00, 75.9±7.2)
T5: 181.4±14.7
(18.50±1.50, 133.8±10.8)
8
3-4COMPONENT PARTS
3. Rear Differential Assembly

1. Propeller Shaft
A: ON-CAR SERVICE
Check the following points with propeller shaft installed in
vehicle.
1) Joints and connections
Check for any looseness of yoke flange connecting bolts
and center bearing retaining bolts.
G3M0019
2) Splines and bearing locations
Turn propeller shaft by hand to see if abnormal free play
exists at splines. Also move yokes to see if abnormal free
play exists at spiders and bearings.
G3M0020
3) Runout of propeller shaft
Turn rear wheels by hand to check for“runout”of propel-
ler shaft.
Runout:
Limit 0.6 mm (0.024 in)
NOTE:
Measure runout with a dial gauge at the center of front and
rear propeller shaft tubes.
G3M0255
4) Center bearing free play
While holding propeller shaft near center bearing with your
hand, move it up and down, and left and right to check for
any abnormal bearing free play.
B: REMOVAL
NOTE:
Before removing propeller shaft, wrap metal parts with a
cloth or rubber material.
1) Disconnect ground cable from battery.
2) Move selector lever or gear shift lever to“N”.
3) Release the parking brake.
4) Jack-up vehicle and support it with sturdy racks.
5) Remove rear exhaust pipe and muffler.
<Ref. to 2-9 [W2A0], [W3A0].>
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3-4SERVICE PROCEDURE
1. Propeller Shaft

G3M0021
6) Remove front exhaust cover.
G3M0022
7) Remove differential mount front cover.
G3M0782
8) Remove the four bolts which hold propeller shaft to rear
differential.
NOTE:
Put matching mark on affected parts before removal.
Remove all but one bolt.
G3M0024
9) Remove the two bolts which hold center bearing to
vehicle body.
G3M0025
10) Remove propeller shaft from transmission.
CAUTION:
Be sure not to damage oil seals and the frictional sur-
face of sleeve yoke.
NOTE:
Be sure to use an empty oil can to catch oil flowing out
when removing propeller shaft.
Be sure to plug the opening in transmission after
removal of propeller shaft.
10
3-4SERVICE PROCEDURE
1. Propeller Shaft

G3M0026
11) Install the extension cap to transmission.
G3M0027
C: DISASSEMBLY
Before removing center bearing, check its condition. If it
does not operate smoothly or if there is any free play or
leakage, remove as follows:
1) Put matching marks on affected parts.
G3M0028
2) Remove bolts which hold front propeller shaft to rear
propeller shaft.
G3M0029
3) Place companion flange in a vise and remove stake nut.
CAUTION:
Be sure not to hold propeller shaft pipe portion in the
vise.
G3M0030
4) Drive out companion flange with a puller or press.
NOTE:
Before disassembling, put matching mark on affected
parts.
11
3-4SERVICE PROCEDURE
1. Propeller Shaft

G3M0031
5) Lightly tap the head of front propeller shaft with a cop-
per hammer until center bearing is removed.
CAUTION:
Be careful not to damage the thread portion.
D: INSPECTION
NOTE:
Do not disassemble propeller shaft. Check the following
and replace if necessary.
1) Tube surfaces for dents or cracks
2) Splines for deformation or abnormal wear
3) Joints for non-smooth operation or abnormal noise
4) Center bearing for free play, noise or non-smooth
operation
5) Oil seals for abnormal wear or damage
6) Center bearing for breakage
G3M0030
E: ASSEMBLY
1) Install center bearing onto front propeller shaft.
2) Align marks and install companion flange.
G3M0029
3) Tighten stake nut until center bearing is set in position.
CAUTION:
Be sure to install new stake nut.
Tightening torque:
270±25 N⋅m (27.5±2.5 kg-m, 199±18 ft-lb)
NOTE:
Stake the nut after tightening.
12
3-4SERVICE PROCEDURE
1. Propeller Shaft