Opel Frontera UBS. Manual - part 1951

DIFFERENTIAL (REAR 244mm) 4A2B–27

2. Adjust the backlash between the side gear and

the pinion gear.

Backlash: 0.15 – 0.20 mm (0.006 – 0.008 in)

Thickness of thrust washers available

mm

0.80

0.90

1.00

1.10

1.20

1.30

in

0.031

0.035

0.039

0.043

0.047

0.051

425RY00008

4. Install lock pin.

D

Install the lock pin using small drift.

425RY00009

5. Install exciter ring (If equipped with rear wheel

antilock).

D

Press the exciter ring on the differential cage using
the ring gear as a pilot.

NOTE: Discard used exciter ring and install new one.

425RS052

6. Tighten the bolts in diagonal sequence as illustrated.

Torque: 127N·m (13.0kg·m/94 lb ft)

NOTE: Discard used bolts and install new ones.

425RW033

4A2B–28

DIFFERENTIAL (REAR 244mm)

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 244mm) 4A2B–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

4A2B–30

DIFFERENTIAL (REAR 244mm)

D

Pressure ring

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Legend

(3) Sliding surface with the friction disc. When

nicks or scratches are found, polish with an oil
stone and repair on a level block using a
compound.

(4) Sliding spherical surface with the pinion gear.
(5) Sliding surface with the side gear.
(6) V–shaped groove of the pressure ring and V

–shaped section of the pinion shaft.

(7) Fitting section with the case.
(8) Face contacting the inner surface of the

differential case. Repair burrs and nicks using
an oil stone. 

D

Thrust washer

425RS058

Legend

(9) Sliding surface with the side gear or case.

(10) Peripheral groove of the side gear.

Repair light nicks and burrs using an oil stone.

D

Case

425RS059

Legend

(11) Contact surface with the spring disc.

(12) Inner groove of the differential cage B.

Repair light nicks and burrs using an oil stone.

425RS060

Legend

(7) Fitting section with the case.
(8) Face contacting the inner surface of the

differential case.

Repair burrs and nicks using an oil stone.

(9) Sliding surface with the side gear or case.

(11) Contact surface with spring disc.