Remove/install transmission with torque converter

AR27.10-P-0500V

Remove/install transmission with torque converter

06.03.2020

Transmission

722.9 in model 171

Modification notes

10.03.2014

"Remove corrosion from crankshaft" added.

Operation step 21

Shown on model 171.456

1

Shield

15

Shift rod

2

Bolts

16

Range selector lever

3

Rear engine support

20

Propeller shaft

4

Bolts

20v

Front flex disk

5

Transmission

W49

Ground (transmission)

14

Retaining clamp

5

Transmission

8

Screw

9

Torque converter

Topical note

Notes on self-locking nuts and bolts

AH00.00-N-0001-01A

 

Remove/install

1

Move selector lever into position "N"

2

Release parking brake

3

Open hood

AR88.40-P-1000V

4

Detach ground line from battery

AR54.10-P-0003V

Topical note

Notes on battery

AH54.10-P-0001-01A

5

Lift vehicle on vehicle lift

AR00.60-P-1000V

6

Remove bottom engine compartment paneling

AR61.20-P-1105V

7.1

Detach electrical connector of heated O2 probes

MODEL 171.454/ 456/ 458

AR07.52-P-5303VA

7.2

Remove complete exhaust system

MODEL 171.473

AR49.10-P-7000VT

8

Unclip electrical feed lines from retaining clamps on transmission (5)

9

Remove shield (1) and disconnect electrical connector from electric controller unit

AR27.40-P-0700-01V

 Bolt, heat shield to transmission housing

*BA27.40-P-1014-01A

 Bolt, leaf spring to transmission housing

*BA27.40-P-1019-01A

10

Detach shift rod (15) at range selector lever (16) of transmission (5)

AR27.60-P-0990VA

 Installation: Replace the retaining clamp (14).

11

Support transmission (5) with transmission jack and transmission platform and lash down securely

12

Remove bolts (2, 4) and remove rear engine support (3) with rear engine mount

AR22.10-P-1160VA

 Check the rear engine mount for wear.

 Installation: Attach the transmission ground (W49) to the rear engine mount.

13

Remove front flexible coupling (20v)

AR41.10-P-0050-02V

When installing front propeller shaft at transmission:



Mount front propeller shaft to transmission

AR41.10-P-0050-07V

 Self-locking nut, flexible coupling to transmission or front propeller shaft

*BA41.10-P-1001-01A

If the fitted sleeves are jammed:



Loosen fitting sleeves of front flexible coupling (20v).

AR41.10-P-0050-09V

Prepare drift for loosening fitted sleeves in flexible couplings.



WF58.50-P-4110-01A

14

Detach torque converter (9) from driven plate

AR27.20-P-0100-01A


Do not use an impact wrench or compressed air tool.
Otherwise the threaded unions of the driven plate will be damaged.

 Bolt, torque converter to driver spider

*BA27.20-P-1002-01C

 Long wedge

*115589035900

 Socket wrench bit

*001589650900

15

Press torque converter (9) evenly off driven plate using long wedge

 Do not damage the torque converter (9) and driven plate.

 Long wedge

*115589035900

16

Detach right and left oil cooling line from transmission (5) and engine oil pan and place to one side


Before starting work the area around the oil cooler lines must be thoroughly cleaned in the area around the separation points on the transmission (5).
Even the smallest dirt particles in the hydraulic components can lead to malfunctions and a total failure of the transmission (5).

 Do not bend or kink oil cooling lines.

 Seal off the connections on the transmission (5) and the oil lines using stop plugs.

 Installation: Replace O-rings.

 Screw, oil cooler oil line to oil pan

*BA27.55-P-1003-01D

 Bolt, clamp to oil line

*BA27.55-P-1004-01D

 Bolt, oil line to transmission housing

*BA27.55-P-1002-01D

 Record plug

*129589009100

17

Detach starter from transmission (5)

MODEL 171.454/ 456/ 458

AR15.30-P-7100VA

MODEL 171.473

AR15.30-P-7100VT

 Place starter to the side with lines connected and secure to prevent it falling down.

18

Remove screws/bolts (8)

 Installation: Secure bracket of electric feed lines at transmission (5).

 Bolt, automatic transmission to engine

*BA27.40-P-1008-01A

19

Remove transmission (5) from below

 Secure torque converter (9) to prevent it from falling out.

 Installation: Align the holes of the torque converter (9) with the threaded unions in the driven plate.

20

Remove torque converter (9) with grab handles

If necessary

AR27.20-P-0500-01W

Multi-purpose paste

*BR00.45-Z-1009-06A

Installed height of torque converter

*BE27.20-P-1001-01E

 Parallel rest

*126589043100

 Handles

*168589006200

21

Remove corrosion from crankshaft

AR03.20-P-1000-01A

Assembly cleaner

*BR00.45-Z-1028-04A

Multi-purpose paste

*BR00.45-Z-1009-06A



Check

22

Check threaded unions in the driven plate

If threaded unions are damaged or loose:



The driven plate must be replaced.

23

Install in the reverse order

24

Perform basic programming

AR00.19-P-0200V

25

Check transmission oil level and correct if necessary

AR27.00-P-0270W

26

Read out fault memory using the diagnostic system and clear if necessary



AD00.00-P-2000-04A

27

Perform transmission adaptation using diagnostic system

After replacement or repair of transmission (5)

28

Reset data on service life of torque converter lockup clutch using diagnostic system

After replacement of torque converter (9)

 Warning

Risk of accident from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running.

Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.

AS00.00-Z-0005-01A

29

Perform engine test run and check transmission (5) for proper operation and leak tightness

Test values for torque converter

Number

Designation

Transmission 722.9

BE27.20-P-1001-01E

Installed height of torque converter

Distance, bolt flange to transmission housing flange

Helical screwed connection

mm

9,5

See picture

AR27.20-P-0500-01W

Axial screwed connection

mm

19,5

 Torque converter

Number

Designation

Transmission 722.9

BA27.20-P-1002-01C

Bolt, torque converter to driver spider

Straight threaded connection

M8

Nm

42

Angled threaded connection

Stage 1

Nm

4

Stage 2

Nm

30

Stage 3

°

90

 Housing

Number

Designation

Transmission 722.9

BA27.40-P-1008-01A

Bolt, automatic transmission to engine

M1040

Nm

38

M1045

Nm

38

M1090

Nm

38

M12

Nm

–

 Housing

Number

Designation

Transmission 722.9

BA27.40-P-1014-01A

Bolt, heat shield to transmission housing

Nm

9

 Housing

Number

Designation

Transmission 722.9

BA27.40-P-1019-01A

Bolt, leaf spring to transmission housing

Nm

5

 Transmission oil cooling

Number

Designation

Transmission 722.9

BA27.55-P-1002-01D

Bolt, oil line to transmission housing

Banjo bolt

Stage 1

Nm

5

Stage 2

°

90

Hexalobular bolt

Nm

12

 Transmission oil cooling

Number

Designation

Transmission 722.9

BA27.55-P-1003-01D

Screw, oil cooler oil line to oil pan

Nm

12

 Transmission oil cooling

Number

Designation

Transmission 722.9

BA27.55-P-1004-01D

Bolt, clamp to oil line

Nm

8

 Propeller shaft

Number

Designation

Model 171

BA41.10-P-1001-01A

Self-locking nut, flexible coupling to transmission or front propeller shaft

M10

Nm

-

M12

Nm

68

Repair materials

Number

Designation

Order number

BR00.45-Z-1009-06A

Multi-purpose paste

A 000 989 80 51

BR00.45-Z-1028-04A

Assembly cleaner

A 000 986 56 01