Subaru 2009 IMPREZA Service Manual page 2142

MANUAL TRANSMISSION AND DIFFERENTIAL
E: INSPECTION
Repair or replace the differential gear in the follow-
ing cases:
• When the hypoid drive gear and drive pinion
shaft tooth surfaces are damaged, excessively
worn, or seized.
• When the roller bearing on the drive pinion shaft
has a worn or damaged roller path.
• When there is damage, wear or seizure of the dif-
ferential bevel pinion, differential bevel gear, wash-
er, pinion shaft or straight pin.
• When the differential case sliding surfaces are
worn or damaged.
(A)
(B)
(H) (C)
(D)
(I)
(A) Drive pinion shaft
(B) Hypoid driven gear
(C) Pinion shaft
(D) Straight pin
(E) Washer
(F) Differential bevel gear
(G) Differential bevel pinion
(H) Roller bearing
(I) Differential case
Front Differential Assembly
(G)
(E)
(F)
(F)
(E)
(G)
(H)
MT-01074
5MT-70
1. BEVEL PINION GEAR BACKLASH
Measure the backlash between differential bevel
gear and differential bevel pinion. If backlash is not
within specified value, install a suitable washer to
adjust. <Ref. to 5MT-71, ADJUSTMENT, Front Dif-
ferential Assembly.>
NOTE:
Be sure the pinion gear teeth contacts adjacent
gear teeth during measurement.
ST1 498247001 MAGNET BASE
ST2 498247100 DIAL GAUGE
Standard backlash
0.13 — 0.18 mm (0.0051 — 0.0071 in)
ST2
2. HYPOID GEAR BACKLASH
1) Set the ST1, ST2 and ST3. Insert the needle
through transmission oil drain plug hole so that the
needle comes in contact with the tooth surface on
the right corner, and check the backlash.
ST1 498247001 MAGNET BASE
ST2 498247100 DIAL GAUGE
ST3 498255400 PLATE
2) Install SUBARU genuine axle shafts to both
sides, rotate in the inversion direction so that the
gauge contacts the tooth surface, and read the dial
gauge
Part No. 38415AA100
Backlash
0.13 — 0.18 mm (0.0051 — 0.0071 in)
ST3
NOTE:
If the backlash is outside the specified range, ad-
just it by turning the side retainer in the right side
case.
ST1
MT-00285
AXLE SHAFT
ST2
ST1
MT-00293