Subaru 2006 Legacy, Manual

Page: 3891 / 4302

DI-72
Rear Differential (VA-type)
DIFFERENTIALS
E: INSPECTION
Wash all the disassembled parts clean, and exam-
ine them for wear, damage or other defects. Repair
or replace the defective parts as necessary.
1) Hypoid driven gear and drive pinion
• If there is evidently an abnormal tooth contact,
find out the cause and adjust until the teeth contact
correctly. Replace the gear if there is an excessive
worn or an incapable adjustment.
• If crack, cutout or seizure is found, replace the
parts as a set. Slight damage of some teeth can be
corrected by oil stone or the like.
2) Side gear and pinion mate gear
• Replace if cracks, scoring or other defects are
evident on the tooth surface.
• Replace if thrust washer contact surface is worn
or seized. Slight damages of the surface can be
corrected by oil stones or equivalent.
3) Bearing
Replace if seizure, peeling, wear, rust, dragging
during rotation, noise or other defect is evident.
4) Thrust washer of the side gear and pinion mate
gear:
Replace if seized, flawed, abnormally worn or hav-
ing other defects.
5) Oil seal
Replace if deformed or damaged, and at every dis-
assembling.
6) Differential carrier
Replace if the bearing bores are worn or damaged.
7) Differential case
Replace if its sliding surfaces are worn or cracked.
8) Companion flange
Replace if the oil seal lip contact surface shows
cracking.
1. SIDE GEAR BACKLASH
Using a dial gauge, check the backlash of side
gear. (VA1-type only)
Side gear backlash:
0.05 — 0.15 mm (0.0020 — 0.0059 in)
If the side gear backlash is not within the specifica-
tion, select the side gear thrust washer and adjust
the side gear backlash as specified.
2. HYPOID DRIVEN GEAR BACKLASH
Using a dial gauge, check the backlash of hypoid
driven gear.
Hypoid driven gear backlash:
0.10 — 0.15 mm (0.0039 — 0.0059 in)
If the hypoid driven gear backlash is not within the
specification, adjust the side bearing preload or re-
pair if necessary.
3. TOOTH CONTACT BETWEEN HYPOID
DRIVEN GEAR AND DRIVE PINION
Inspect the tooth contact between the hypoid driv-
en gear and drive pinion. <Ref. to DI-53, ASSEM-
BLY, Rear Differential (VA-type).>
4. COMPANION FLANGE
1) If rust or dirt is attached to the companion flange,
remove them.
2) Set a dial gauge at a companion flange surface
(mating surface of propeller shaft and companion
flange), and then measure the companion flange
runout.
Limit of runout:
0.08 mm (0.003 in)
DI-00240
DI-00099
DI-00360
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