Front Differential Assembly: Inspection
Repair or replace the differential gear in the following cases:
- The hypoid drive gear and drive pinion shaft tooth surface are damaged, excessively worn, or seized.
- The roller bearing on the drive pinion shaft has a worn or damaged roller path.
- There is damage, wear, or seizure of the differential bevel pinion, differential bevel gear, washer, pinion shaft, and straight pin.
- The differential case has worn or damaged sliding surfaces.
- BEVEL PINION GEAR BACKLASH
Measure the backlash between bevel gear and pinion. If it is not within specifications, install a suitable washer to adjust it.
NOTE: Be sure the pinion gear tooth 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)
- HYPOID GEAR BACKLASH
- Insert the SUBARU genuine axle shaft into the left and right side retainer holes. (TURBO model)
ST 38415AA000 AXLE SHAFT
- 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 at a right angle and check the backlash.
ST1 498247001 MAGNET BASE
ST2 498247100 DIAL GAUGE
ST3 498255400 PLATE
- Backlash: 0.13 - 0.18 mm (0.0051 - 0.0071 in)
NOTE: If the backlash is outside specified range, adjust it by turning the holder in right side case. - Insert the SUBARU genuine axle shaft into the left and right side retainer holes. (TURBO model)
- TOOTH CONTACT OF HYPOID GEAR
Check the tooth contact of hypoid gear as follows: Apply a uniform thin coat of red lead on both tooth surfaces of 3 or 4 teeth of the hypoid gear. Move the hypoid gear back and forth by turning the transmission main shaft until a definite contact pattern is developed on hypoid gear, and judge whether face contact is correct. If it is inaccurate, make adjustment. Refer to ADJUSTMENT , Front Differential Assembly.
- Tooth contact is correct.