Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 499
DI-41
Rear Differential (T-type)
DIFFERENTIALS
25) Apply liquid gasket to the bolts indicated by ar-
rows, and tighten the bolts.
Liquid gasket:
THREE BOND 1110F (Part No. K0879Y0021),
THREE BOND 1110B or equivalent
Tightening torque:
10.5 N·m (1.1 kgf-m, 7.7 ft-lb)
26) Install the gasket and rear cover, and tighten
the bolts to specified torque.
NOTE:
Use a new gasket.
Tightening torque:
29.5 N·m (3.0 kgf-m, 21.8 ft-lb)
27) Install the air breather cap.
NOTE:
When installing the air breather cap, do not tap sec-
tion (A). Be sure to tap section (B) to install.
28) Install the drain plug.
NOTE:
Apply liquid gasket to the drain plug.
Liquid gasket:
THREE BOND 1105 (Part No. 004403010) or
equivalent
Tightening torque:
49 N·m (5.0 kgf-m, 36.1 ft-lb)
29) Install the filler plug.
NOTE:
After installing the rear differential assembly to the
vehicle, fill the gear oil, then apply liquid gasket,
and tighten to the specified torque. <Ref. to DI-19,
REPLACEMENT, Differential Gear Oil.>
DI-00461
DI-00490
DI-00674
(A)
(B)
DI-42
Rear Differential (T-type)
DIFFERENTIALS
2. T-TYPE (H3)
NOTE:
• Assemble in the reverse order of disassembly.
• Check and adjust each part during assembly.
• Keep the shims and washers in order, so that
they are not improperly installed.
• Thoroughly clean the surfaces on which the
shims, washers and bearings are to be installed.
• Apply gear oil when installing the bearings and
thrust washers.
• Be careful not to mix up the RH and LH bearing
races.
• Use a new O-ring and gasket.
• Replace the oil seal with a new part at every dis-
assembly.
• Be careful not to mix up the oil seal RH and LH.
• Apply differential gear oil to the lips when install-
ing the oil seal.
1) Adjusting preload for front and rear bearings
NOTE:
Adjust the bearing preload between front and rear
bearings with spacer and washer. Pinion height ad-
justing washer is not affected by this adjustment.
The adjustment must not be carried out with oil seal
inserted.
2) Using the ST, press-fit the rear bearing race to
the differential carrier.
ST 398417700
DRIFT
3) Using the ST, press-fit the front bearing race to
the differential carrier.
NOTE:
Use a new front bearing race.
ST 398477702
DRIFT
4) Selecting the pinion height adjusting washer
(1) Measure the thickness of the inserted pinion
height adjusting washer.
(2) Read the markings on both the current drive
pinion gear and the new pinion gear.
NOTE:
No marking means 0 (zero).
DI-00697
ST
DI-00318
DI-00319
0
0
5
5
10
10
15
DI-00320
+2
DI-00321
DI-43
Rear Differential (T-type)
DIFFERENTIALS
(3) Calculate the thickness of pinion height ad-
justing washer to be inserted from the following
formula, and replace the installed washer with a
new washer of the calculated thickness.
T = T1 + (T2 × 0.01 – T3 × 0.01)
(Example of calculation)
T1 = 3.30 mm (0.1299 in), T2 = +2, T3 = –1
T = 3.30 mm (0.1299 in) + {(2 × 0.01) – (–1 ×
0.01)} = 3.33 mm (0.1311 in)
Result: Thickness = 3.33 mm (0.1311 in)
The washer with part number 38336AA310 is
used.
5) Install the selected pinion height adjusting wash-
er on drive pinion, and push the rear bearing cone
into position with ST.
ST 18674AA000 INSTALLER
6) Insert the drive pinion into the differential carrier,
and install the originally attached preload adjusting
spacer and washer.
7) Install the front bearing cone.
NOTE:
Use new front bearing cone.
T
Thickness of selected pinion height adjusting
washer mm (in)
T1
Thickness of inserted pinion height adjusting
washer mm (in)
T2
Number of the installed drive pinion gear mark-
ing mm (in)
T3
Number of new drive pinion gear marking mm
(in)
Memo:
Pinion height adjusting washer
Part No.
Thickness mm (in)
38336AA230
3.09 (0.1217)
38336AA240
3.12 (0.1228)
38336AA250
3.15 (0.1240)
38336AA260
3.18 (0.1252)
38336AA270
3.21 (0.1264)
38336AA280
3.24 (0.1276)
38336AA290
3.27 (0.1287)
38336AA300
3.30 (0.1299)
38336AA310
3.33 (0.1311)
38336AA320
3.36 (0.1323)
38336AA330
3.39 (0.1335)
38336AA340
3.42 (0.1346)
38336AA350
3.45 (0.1358)
38336AA360
3.48 (0.1370)
38336AA370
3.51 (0.1382)
38336AA380
3.54 (0.1394)
38336AA390
3.57 (0.1406)
38336AA400
3.60 (0.1417)
38336AA410
3.63 (0.1429)
38336AA420
3.66 (0.1441)
(A) Drive pinion
(B) Preload adjusting spacer
(C) Preload adjusting washer
(D) Differential carrier
DI-00085
ST
DI-00704
(A)
(B)
(C)
(D)
DI-44
Rear Differential (T-type)
DIFFERENTIALS
8) Insert the spacer and press-fit the pilot bearing
using ST.
NOTE:
Use a new pilot bearing.
ST1 399780104
WEIGHT
ST2 899580100
INSTALLER
ST3 398507703
DUMMY COLLAR
ST4 498937110
HOLDER DRIVE PINION
9) Press-fit the companion flange with ST1, ST2,
and ST3.
NOTE:
Be careful not to damage the bearing.
ST1 899874100
INSTALLER
ST2 399780104
WEIGHT
ST3 498937110
HOLDER DRIVE PINION
10) Attach the self-locking nut and use the ST to fix
the companion flange in place, then tighten the
self-locking nut.
Tightening torque:
181.5 N·m (18.5 kgf-m, 133.9 ft-lb)
ST 18633AA000 WRENCH COMPL
11) Rotate the drive pinion shaft 10 times or more
to fit it in the respective taper roller bearing, and
then measure the initial load or initial torque.
Initial load:
24.1 — 38.6 N (2.5 — 3.9 kgf, 5.4 — 8.7 lbf)
Initial torque:
0.98 — 1.57 N·m (0.10 — 0.16 kgf-m, 0.72 —
1.16 ft-lb)
ST2
ST3
ST1
ST4
ST1
ST4
DI-00322
ST3
ST1
ST2
ST2
DI-00323
DI-00091
ST
DI-00715
DI-00481
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