A) Version with closed differential housing
Remove entire differential housing cf. 33 13 010.
Force out tightening sleeve (1) and differential gear axle (2).


33 13 010

Screw out both differential bevel gears together with
driving flange.

Take out rear axle side gears together with plate springs
and shims.

Note when fitting : Fit in one rear axle side with
differential bevel gears and differential gear axle.
Fit indicator gauge with support.
Using two screwdrivers, press rear axle side gear hard
towards the differential bevel gears.
When doing this, set indicator gauge to zero.

Press rear axle side gear against differential housing and
read indicator gauge. Reading may be, for example,
2.90 mm (0.11417").

Deduct 0.05 mm (0.00197") from the reading thus obtained.
This will then show the shim and plate spring thickness.
Example: 2.90 mm (0.11417")
- 0.05 mm (0.00197")

--------------------------------

2.85 mm (0.11221")


This gap of 0.05 mm (0.00197") is necessary to ensure that
the plate spring does not bear on the block with any initial
tension.
When one rear axle side gear and two differential bevel
gears have been fitted, the frictional value must not exceed
2.0 mkp (1446 ft Ib).

Proceed on the other side same way.
Fit in shim (A) and plate spring (B). The concave side of
plate spring (B) must face towards the rear axle side gear.

Fit driving flange into one rear axle side gear. Then place
a shim approximately 10 mm (0.3937") thickness on the rear
axle side gear. Screwing in a bolt, press the plate springs
together the differential bevel pinions can be fitted into the
differential housing.

B) Version with split differential housing
- marked on the final drive housing with white paint -
Remove entire differential housing cf. 33 13 010.
Take off upper part of differential housing (1).
Note when fitting: Tighten bolts to a torque of 2.2 +
0.2 mkp (15.906 + 1.446 ft Ib).


33 13 010

Remove differential bevel gears with axles (2) and (3).

Take out rear axle side gears (4) with plate springs (5)
and shims (6).

Note when fitting: Fit in one rear axle side gear and one
differential gear axle with two differential bevel gears.
Do not fit in plate spring and shim. Screw differential
housing together.
Using support tool No. 5104/1, fit on indicator gauge.
Using a screwdriver, press the rear axle side gear hard
towards the differential bevel gears. When doing so, set
indicator gauge to zero.

Press rear axle side gear against differential housing and
read indicator gauge. The indicator gauge may, for example,
read 2.90 mm (0.11417").

Deduct 0.05 ÷ 0.10 mm (0.00197" ÷ 0.00394") from the value
thus obtained. This will show the thickness of the shims
and the plate springs (X).
Example: 2.90 mm (0.11417")
- 0.05 mm (0.00197")

--------------------------------
2.85 mm (0.11221")

--------------------------------
0.05 ÷ 0.10 mm (0.00197 ÷ 0.00394") must be deduct from
thickness (X) to ensure that the plate spring does not bear
on the block with any initial tension.

Proceed on the other side in the same way.
Fit in shim (A) and plate spring (B).
Make sure that the concave side of plate spring (B) faces
towards the rear axle side gear.

Fit in both driving flanges.
Secure one driving flange and force the other to turn.
Turning torque 1.5 ÷ 2.5 mkp (10.845 ÷ 18.075 ft Ib).

General remarks:
The self-locking differential offers the following
advantage:
(a) When driving on a rough surface the spinning action
of a wheel that is not under the car's weight can be
greatly reduced.
(b) When accelerating or when on the road the spinning
of a wheel caused by insufficient tyre grip is avoided.
(c) In fast cornering the inner wheel would spin if the
self-locking differential effect were not provided.
(d) In rainy weather and at high speeds the wheels are
prevented from spinning on water (aquaplaning).
(e) The risk of skidding when driving fast on bad surfaces
with varying tyre grip is eliminated.
Checking the self-locking differential for functionality
in situ:
(a) Floor of workshop must be flat.
(b) Drive car with left rear wheel onto roller and No.
7023.
(c) Ensure the handbrake is not applied.
(d) Engage 1st gear and accelerate.
(e) The self-locking differential is functioning properly if
the car can be driven off roller stand No. 7023.

S 40 self-locking differentials are fitted with inner laminations
coated with a layer of Molybdane.
Old version: plane or rhombus pattern.