Opel Frontera UBS. Manual - part 118

4A2A–28 DIFFERENTIAL (REAR 220mm)

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.

Measure the Deformation of the friction disc & plate.

Limit: 0.08 mm (0.003 in)

425RS061

Measure the wear of the friction plate & disc

Limit(A–B): 0.1 mm (0.004 in)

Remarks:
A=Inner or outer projections
B=Sliding surface subjected to abrasion

425RS062

Measure the wear of the thrust washer

Limit: 1.3 mm (0.05 in)

425RS063

Reassembly

Adjust the clearance between the friction disc and plate.

1. Measuring the depth of the differential cage.

Standard (A–B):

80.58 mm (3.17 in)

(C):

10.58 mm (0.41 in)

425RS064

2. Measuring the overall length of the pressurering,

friction disc and friction plate.

D

Mount the pinion shaft in the pressurering and then
install the friction disc & plate.

DIFFERENTIAL (REAR 220mm) 4A2A–29

D

Measure the length between the plates over the
V–groove. (D)

425RS065

3. After measuring dimensions A,B,C and D, make

adjustment in the following manner:

D

Measure the thickness (E) of the spring disc.
1.75mm (0.069in)

×

4 discs

4. Select the friction disc & plate so as to satisfy the

following equation:
{(A-B)+C}-(D+E)=0.06-0.20mm (0.002-0.008in)
Also, the total size difference of the friction disc &
plate and spring disc should be 0.05mm (0.02in) or
less.

Thickness :1.75–1.85mm(0.069–0.073 in)

Backlash adjustment of the side gear in
the direction of the shaft

1. Measuring the depth of the differential cage. 

(F–B): 82.03 mm (3.23 in)

(G): 12.03 mm (0.47 in)

425RS066

2. Measuring the dimension between the thrust washers

at both ends.

D

Assemble the side gear, pinion, pinion shaft,
pressure ring and thrust washer, and pressing the
pressure ring to–the pinion shaft in the direction of
the shaft to make the clearance 0.

D

Have the side gear contact to the pinion to make the
backlash 0. 

D

Measure the dimension  (H) between thrust
washers at both ends.

425RS067

4A2A–30 DIFFERENTIAL (REAR 220mm)

3. After measuring dimensions of each of the above

sections, proceed with the adjustment in the following
manner:
Adjust the clearance to satisfy the equation below.
{(F – B) + G – H}=0.05 – 0.20 mm
Also, select the thrust washers so that the
dimensional difference between the back surfaces of
the left and right pressure rings to the thrust washers
is 0.05mm or less.

Thickness :

1.5mm (0.059 in)

1.6 mm(0.063 in)

1.7 mm(0.067 in)

NOTE: When assembling the parts, apply recommended
gear oil sufficiently to each of the parts, especially, to the
contact surfaces and sliding surfaces.

1. Install Differential cage B.
2. Install Thrust washer.
3. Install Spring disc.

D

When assembling the spring disc, make sure the
mounting direction is correct as shown in figure.

425RS068

Legend

(1) Friction Plate
(2) Spring Disc
(3) Friction Disc

4. Inatall Spring disc.
5. Inatall Friction plate.
6. Inatall Friction disc.
7. Inatall Friction plate.
8. Inatall Friction disc.
9. Inatall Pressure ring.

10. Inatall Side gear.

11. Inatall Pinion and pinion shaft.

12. Inatall Side gear.
13. Inatall Pressure ring. 
14. Inatall Friction disc.

15. Inatall Friction plate.
16. Inatall Friction disc.
17. Inatall Friction plate.
18. Inatall Spring disc.

D

When assembling the spring disc, make sure the
mounting direction is correct.

19. Inatall Spring disc.
20. Inatall Thrust washer.
21. Inatall Differential cage A.
22. Inatall Screw.

D

Matching the guide marks of the differential cages A
and B, tighten the screws evenly in the diagonal
order.

425RS055

DIFFERENTIAL (REAR 220mm) 4A2A–31

23. Check the operation.

D

Measure the starting torque using the side gear
holder. 

Starting torque:

64 – 98 N·m (6.5 – 7.3 kg·m/ 47 – 72Ib ft)

425RW065

Legend

(1) Side Gear Holder : 5–8840–2381–0