VA1-TYPE Subaru Legacy BM/BR

VA1-TYPE

To detect the real cause of trouble, inspect the following items before disassembling.

1. Tooth contact and backlash between hypoid driven gear and drive pinion
2. Hypoid driven gear runout on its back surface
3. Total preload of drive pinion

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1. Set the ST on vise and install the differential assembly to ST. ST 398217700 ATTACHMENT SET
2. Remove the oil drain plug and oil filler plug.
3. Remove the rear cover by removing retaining bolts. NOTE: Remove it by tapping with a plastic hammer.
4. Remove the air breather cap. NOTE: Do not attempt to replace the air breather cap unless necessary. Whenever the air breather cap is removed, replace it with a new part.
5. Remove the lock plate RH and LH.
6. Remove the side retainer RH and LH with ST. NOTE: When keeping the retainers aside, use labels etc. to avoid confusing the left and right. ST 18630AA010 WRENCH COMPL RETAINER
7. Pull out the differential case assembly from differential carrier. NOTE: Be careful not to hit the teeth of hypoid driven gear against the case.
8. Remove the bearing race from side retainer RH and LH with ST1 and ST2. ST1 499705401 PULLER ASSY ST2 499705404 SEAT
9. Remove the oil seal from the RH and LH side retainers using a screwdriver. NOTE: Perform this operation only when changing oil seal.
10. Extract the bearing cone with ST1 and ST2. NOTE: Do not attempt to disassemble the parts unless necessary. Set the puller so that its claws catch the edge of the bearing cone. Store so that the right and left side bearing races and cones are not mixed together. ST1 899524100 PULLER SET ST2 399520105 SEAT
11. Remove the hypoid driven gear by loosening hypoid driven gear bolts.
12. Remove the spring pin from hypoid driven gear side using ST. ST 899904100 STRAIGHT PIN REMOVER
13. Draw out the pinion mate shaft and remove pinion mate gears, side gears and thrust washers. NOTE: The gears should be marked or kept separated right and left, and front and rear as well as thrust washers.
14. Remove the self-locking nut while holding the companion flange with ST. ST 498427200 FLANGE WRENCH
15. Extract the companion flange with a puller.
16. Press the end of drive pinion shaft and extract it together with rear bearing cone, pinion height adjusting washer and washer by using the ST. NOTE: Hold the drive pinion so as not to drop it. ST 398467700 DRIFT
17. Remove the rear bearing cone from drive pinion by supporting the cone with ST. NOTE: Place the replacer so that its center-recessed side faces the pinion gear. ST 498515500 REPLACER
18. Remove the front oil seal from differential carrier using ST. ST 398527700 PULLER ASSY
19. Remove the pilot bearing together with the front bearing cone and spacer using the ST. ST 398467700 DRIFT
20. When replacing the bearings, hit out the front bearing cup and rear bearing cup in this order using a brass bar.