Remove/install rack-and-pinion steering

AR46.20-P-0600MCC

Remove/install rack-and-pinion steering

12.02.2019

Model

451.3/4

except code V26 (Power steering, EPS (FFO))

1

Rack-and-pinion steering

6

Tie rod end

11

Bolts

2

Steering coupling

7

Nut

12

Front axle carrier

3

Nut

8

Retaining clamp

13

Holder (with code (I01) Air conditioning system Plus)

4

Screw

9

Rubber mount

14

Refrigerant lines (with code (I01) Air conditioning system Plus)

5

Nut

10

Stabilizer bar

1

Rack-and-pinion steering



Remove

Topical note

Notes on self-locking nuts and bolts

AH00.00-N-0001-01A

Evaluating steering gear when repairing accident vehicles

AH46.20-P-9409-01A

 Danger

Risk of death caused by vehicle slipping or toppling off of the lifting platform.

Align vehicle between vehicle lift columns and position the four support plates at the vehicle lift support points specified by the vehicle manufacturer.

AS00.00-Z-0010-01A

1

Raise vehicle using the vehicle lift and remove underfloor paneling

2

Remove front bulkhead

 The front bulkhead is attached with two nuts.

3

Loosen nut (3) on steering coupling (2) until it can be turned by hand


Do not completely unscrew nut (3).
Otherwise, the screw (4) will fall out and the steering coupling (2) can be disconnected.
This means that the fanfare horns and airbag clock spring contact may be damaged when the front wheels are pointed straight ahead.

 Turn the front wheels onto lock until the nut (3) is accessible.

4

Lower vehicle with vehicle lift

5

Place the front wheels in the straight-ahead position and block the steering wheel using the holding device


Lock steering wheel.
As otherwise fanfare horns and airbag clock spring contact may become damaged.

 Retainer device

*129589012100

6

Raise vehicle with vehicle lift

7

Unscrew nut (3) on the steering coupling (2), remove bolt (4) and slide steering coupling (2) upwards off the rack-and-pinion steering (1)


Only use the bolt (4) and nut (3) approved for model 451.
Bolts and nuts of other models with the same dimensions have different properties due to other surface coatings and may impair the strength of the bolted connection.

 When the nut (3) is loosened, the cam-shaped bolt (4) rotates with it approx. half a revolution. However, the bolt (4) does not have to be counterheld.
Check the steering coupling (2) for ease of movement and replace if necessary.

8

Remove front wheels

* for USA only

AR40.10-P-1100MCU

* not for USA

AR40.10-P-1100MCC

9

Unscrew nut (5) on left and right tie rod end (6), press off left and right tie rod end (6) with puller and unhook


Press off tie rod ends (6) carefully
in order to prevent damage to axle boots.

 Puller

*450589013300

10

Loosen refrigerant lines (14) from holder (13) in area of battery recess and unscrew holder (13)

In vehicles with code (I01) Air conditioning system Plus

11

Unscrew nuts (7) and remove retaining clamps (8) from stabilizer bar (10)

 The retaining clamps (8) are in 2 parts.

12

Pull stabilizer bar (10) forward and fold away downward

13

Remove screw/bolts (11)

14

Turn rack-and-pinion steering (1) forward and guide over left wheel arch



Check

15

Check elastomer bearing for securing the rack-and-pinion steering (1) for damage

Check elastomer bearing on rack-and-pinion steering (1), replace if necessary.



Remove/install elastomer bearing of rack-and-pinion mounting

AR46.20-P-0600-02SM

Antifriction paste, rubber parts 2.5 kg, DBL 6867.00

*BR00.45-Z-1002-06A



Install

16

Mount rack-and-pinion steering (1) onto front axle carrier (12) via left wheel arch

17

Tighten bolts (11)

 Bolt, rack-and-pinion steering to front axle carrier

*BA46.20-P-1001-01G

18

Fold stabilizer bar (10) upward and position

19

Insert retaining clamps (8) at right angle to stabilizer bar (10) and tighten nuts (7)

 Check elastomer bearing (9), replace if necessary. The opening of the elastomer bearing (9) must point in direction of travel.

 Nut, stabilizer bar to retaining clamp

*BA32.20-P-1003-02I

20

Position holder (13) of refrigerant lines (14) at underbody, tighten and clip refrigerant lines (14) into holder (13)

In vehicles with code (I01) Air conditioning system Plus

21

Hook left and right tie rod end (6) into steering knuckle and tighten nuts (5)


The self-locking nut (5)
must be replaced.

 Check axle boots; replace tie rod end (6) if necessary.

 Self-locking nut, tie rod to steering knuckle

*BA46.40-P-1001-01F

22

Mount front wheels

* for USA only

AR40.10-P-1100MCU

* not for USA

AR40.10-P-1100MCC

23

Mount steering coupling (2) on the rack-and-pinion steering (1), insert bolt (4) and screw on nut (3)


Replace nut (3) and screw (4). Only use the bolt (4) and nut (3) approved for model 451.
Bolts and nuts of other models with the same dimensions have different properties due to other surface coatings and may impair the strength of the bolted connection.

 Ensure that the front wheels are in the straight-ahead position.
The nut (3) of steering coupling (2) will be tightened later.

24

Lower vehicle with vehicle lift

25

Remove retainer from steering wheel

 Retainer device

*129589012100

26

Raise vehicle with vehicle lift

27

Tighten nut (3) on steering coupling (2)

 Turn the front wheels onto lock until the nut (3) is accessible.

 Screw/bolt, steering coupling to rack-and-pinion steering

*BA46.10-P-1001-01F

28

Install front bulkhead

29

Install underfloor paneling

30

Perform wheel alignment check

When replacing the rack-and-pinion steering (1).

without recording the vehicle level

AR40.20-P-0200MCC

with recording the vehicle level

AR40.20-P-0200MCE

 Depending on the workshop equipment select between the measurement variant with recording the vehicle level or without recording the vehicle level.

 Front axle stabilizer bar

Number

Designation

Model 451.3/4

BA32.20-P-1003-02I

Nut, stabilizer bar to retaining clamp

Nm

95

 Steering shaft

Number

Designation

Model 451.3/4

BA46.10-P-1001-01F

Screw/bolt, steering coupling to rack-and-pinion steering

Nm

20

 Steering gear

Number

Designation

Model 451.3/4

BA46.20-P-1001-01G

Bolt, rack-and-pinion steering to front axle carrier

Stage 1

Nm

70

Stage 2

°

–

 Tie rod

Number

Designation

Model 451.3/4

BA46.40-P-1001-01F

Self-locking nut, tie rod to steering knuckle

Nm

34

Repair materials

Number

Designation

Order number

BR00.45-Z-1002-06A

Antifriction paste, rubber parts 2.5 kg, DBL 6867.00

A 000 989 01 60