Opel Frontera UBS. Manual - part 993

4A2A–26 DIFFERENTIAL (REAR 220mm)

Clearance between the side gear and the
differential box:

Standard: 0.05–0.12 mm (0.002–0.005 in)

Limit: 0.15 mm(0.006 in)

425RS046

Legend

(1) Side Gear
(2) Differential Box

Play in splines between the side gear and
the axle shaft: 

Standard: 0.07–0.38 mm(0.003 –0.014 in)

Limit:0.5m (0.02 in)

425RS047

Reassembly

1. Install thrust washer.
2. Install side gear.
3. Install the pinion gear by engaging it with the side

gears while turning both pinion gears simultaneously
in the same direction.

425RS048

4. Install cross pin.

1. Be sure to install the cross pin so that it is in

alignment with the lock pin hole in the differential
cage.

425RS049

2. Adjust the backlash between the side gear and

the pinion gear.

Backlash:0.13 – 0.18 mm (0.005– 0.007 in)

DIFFERENTIAL (REAR 220mm) 4A2A–27

Thickness of thrust washers available:

0.80 mm, 0.90 mm, 1.00 mm 1.10 mm, 1.20 mm,
1.30 mm (0.031 in, 0.035 in, 0.039 in,0.043 in,
0.047 in, 0.051 in)

425RS050

5. Install lock pin. After lock pin installation, stake the

cage to secure the lock pin.

425RS051

Legend

(1) Staked Portion
(2) Lock Pin

6.  Clean the ring gear threaded holes to remove the

locking agent. When installing the ring gear, apply
LOCTITE 271 or equivalent to all the threaded area
and half of the unthreaded area of the bolt.

7. Tighten the bolts in diagonal sequence as illustrated.

Torque: 108 N·m (11.0kg·m/80 lb ft)

NOTE: Discard used bolts and install new ones.

415RW036

4A2A–28 DIFFERENTIAL (REAR 220mm)

Limited Slip Differential

Disassembled View

425RY001

Legend

(1) Screw
(2) Differential cage A
(3) Thrust washer
(4) Spring disc
(5) Friction Plate
(6) Friction plate
(7) Friction Plate 
(8) Friction disc
(9) Friction Plate 

(10) Friction disc 

(11) Friction Plate 

(12) Pressure ring
(13) Side gear

(14) Pinion and Pinion shaft 
(15) Side gear
(16) Pressure ring
(17) Friction Plate
(18) Friction disc
(19) Friction Plate 
(20) Friction disc
(21) Friction Plate 
(22) Friction Plate 
(23) Friction Plate 
(24) Spring disc 
(25) Thrust washer 
(26) Differential cage B 

DIFFERENTIAL (REAR 220mm) 4A2A–29

Disassembly

Differential Cages A and B

1. To ensure installation of the parts in original position

apply a setting mark before removing the differential
cages A and B.

2. Using special tool, 5–8840–2682–0, grip it with a vice,

and set the differential.

425RS054

3. Gradually and evenly loosen the 3 fixing screws of the

differential cages A and B.

425RS055

4. Remove Differential cage A.
5. Remove Thrust washer. 
6. Remove Spring disc.

NOTE: When removing the spring disc, friction disc, and
friction plate, place them in order for clear distinction of
left and right use.

7. Remove Spring disc.
8. Remove Friction plate.

9. Remove Friction plate.

10. Remove Friction disc.

11. Remove Friction plate.

12. Remove Friction disc.
13. Remove Friction plate.
14. Remove Pressure ring.
15. Remove Side gear.
16. Remove Pinion and pinion shaft.
17. Remove Side gear.
18. Remove Pressure ring.
19. Remove Friction plate.
20. Remove Friction disc.
21. Remove Friction plate.
22. Remove Friction disc.
23. Remove Friction plate.
24. Remove Friction plate.
25. Remove Friction plate.
26. Remove Friction disc.
27. Remove Thrust washer.
28. Remove Differential cage B.

Inspection and Repair

Make necessary correction or parts replacement if wear,
damage, corrosion or any other abnormal condition is
found through inspection.

Visual check

Check the following parts for wear, damage, noise or any
other abnormal conditions.

D

Friction disc, friction plate and spring disc

425RS056

Legend

(1) Sliding surfaces
(2) Projections