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REPAIR MAINTENANCE OPERATION OF MOTOR VEHICLES
Mercedes-Benz E-Class W123 (from 1976 to 1985, the year of issue)

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Mercedes-Benz W123
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Mercedes-Benz
W123
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Manual transmission
Design and specifications
Removing and installing transmission
Dismantling gearbox
Assembling the gearbox
Adjustment of a drive of a gear change (from the lever on the tunnel floor pan)
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Manual transmission




Design and specifications

Four- and five-speed gearbox with synchromesh on all forward gears. The gear shift lever is done on the tunnel floor pan. Gearbox housing is cast from an aluminum alloy.

The five-step embodiment is designed based on four-stage by setting the fifth stage at the rear of the gearbox, whereby many repair operations common to both embodiments.


Data for adjustment

Characteristic

Value

Permissible wear of synchronizer ring as measured between the ends of the sliding sleeve and locking ring, not more, mm

10

The thickness of the supplied parts lock rings to adjust the axial clearance of the sliding sleeve of the synchronizer hub, mm

12; 13; 14

The axial clearance of the primary shaft of the gearbox, mm

0.1-0.2

The distance between the wall of the crankcase and the clutch when installed gasket when installing the input shaft in the gearbox housing, mm

139.90

The distance between the wall of the housing and the sliding sleeve of the synchronizer hub during the installation of the secondary shaft in the gearbox housing, mm

138.40

The gap between the ring gear and pinion synchronizer ring 4th gear, mm

15

The diameter of the shaft of the working edge of the stuffing box in the workplace gland edge flange of the secondary shaft, at least, mm

39.34

Beating output flange when measuring the outside diameter of not more than, mm

0.1

Shaft diameter gland working edge in the workplace gland edge on the input shaft, at least, mm

29.70

The beating of primary, secondary and intermediate shaft, mm

0.02


Transmission Oil

Characteristic

Value

Fuel capacity of the transmission case, l

  • until September 1980

1.6 (1.6)

  • from September 1980

1.3 (1.6) *

The used oil

ATF type A

The frequency of inspection level

every 20,000 km

Replacement interval

every 60,000 kilometers

* In brackets are the data for the 5-speed gearbox.


Tightening torques of the main threaded connections kgs.m

Connection Type

Value

Bolt clutch and gearbox to the engine block

cars with gasoline engines

  • M 10x40

5.5

  • M 10x90

4.5

Locking nut propeller shaft

3.0-4.0

Drain and filler plug

6.0

Nuts and bolts bracket front exhaust pipe

7.0

Bolt the front cover to the gearbox housing

20

Bolt back cover to the intermediate Carter cars with petrol engines

2,0-2,8

Nut flange of the input shaft

15.0 / 16.0 *

Nut output flange

15.0 / 15.0

Nut flange intermediate shaft

8.0

Bolt lock the gear lever

0.8

Bolt fork to the stem

0.8

Nut propeller shaft intermediate bearing

3.5

Bolt the gearshift lever - cars with petrol engines

2.5-3.0

Bolt the thrust plate bearing output shaft

15

Nut with collar fastening clamp reversing

20

Bolt lock the gear lever

0.8

Bolt rods shift forks

0.8

Cover gearshift

1.5 / 1.5

* A fraction of data for the 5-speed gearbox.


Types of gearboxes used in the power units of vehicles, and gear ratios

Characteristic

Gearbox
716,216
716,006
714,400

Number of gears

4

4

5

Engine model

M 102 M 115

M 123 M 110

M 102, M 110, M 115, M 123

Broadcast
Ratios

I transfer

3.91

3.98

3,820

II transfer

2.17

2.29

2,202

III transmission

1.37

1.45

1,398

IV transmission

100

10

10

V transmission

-

-

0.813

Reverse

3.78

3.74

3,705





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