Installing Rear Wheel Bearing Housing (Wheel Carrier)

→ Wear personal protective gear.

→ Do not raise the wheel suspension higher than the normal vehicle position (vehicle resting on wheels).

Information 

• The pictures shown in this document may differ from the original  .

Information 

• All screws and bolts on the axle must be tightened in vehicle position. Vehicle position means: vehicle standing on its wheels, or the wheel suspension is raised with a universal vehicle lift. Dimension -X-  , from lower edge of wing to center of axle corresponds to vehicle position  . For the current height values, please refer to the adjustment values for suspension alignment → 4495TW ADJUSTMENT VALUES FOR SUSPENSION ALIGNMENT .
  Fig 1: Checking Dimension X - Lower Edge Of Wing To Centre Of Axle

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• Visually inspect all parts  .
• Replace self-locking nuts  .
• Replace all expansion screws (screws fitted using torque angle tightening procedure)  .
• Use correct tightening torques and torque angle  . → 4X00IN TIGHTENING TORQUES FOR REAR AXLE

Information 

Before installing the shaft, replace the lock ring (circlip) on the shaft as well as the shaft sealing ring in the final drive → 392255 REMOVING AND INSTALLING SEALING RING FOR HALFSHAFT FLANGE (WITHOUT DIFFERENTIAL LOCK) .

Make sure not to damage the sealing ring when guiding the shaft into the final drive.

• The inner end of the drive shaft must be held with both hands at the joint and inserted into the rear axle differential with a quick jerk. The outer joint must be held by a second mechanic in order to prevent damage  .
• Check that the joint is seated correctly in the rear axle differential: Hold the joint with both hands and pull outwards  .
• Visually check that the plastic protective rings are flush on the rear axle differential  .

1. Grease the toothing with a little Optimoly TA aluminum paste and fit the drive shaft -1-  into the wheel bearing housing -2-  (-A-  ). When doing this, press the inner joint together tightly.
   Fig 2: Inserting Drive Shaft Into Wheel Bearing Housing

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   Information 

   • The drive shaft must be pulled in as far as it will go using the fitting tool T10206  .
     Fig 3: Identifying Fitting Tool T10206

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2. Pull the drive shaft into the wheel bearing housing.
3. Grease the mounting-face ring of the axle nut with a little Optimoly TA aluminum paste. Screw on the axle nut.
4. After you have pulled the drive shaft into the wheel bearing housing, it still needs to be pre-tightened to the specified tightening torque.
   Fig 4: Pulling In Drive Shaft

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   1. 4.1. In the first step, "before installation", tighten the drive shaft to → Tightening torque: +130 Nm (+96 ftlb.)  . To do this, place the wheel bearing housing with the drive shaft and tool on the floor (do not damage the brake cover plate) and pull in the drive shaft. 2. A second mechanic is required! -arrow- 
   2. 4.2. The second tightening step is performed when the wheel bearing housing is installed in the section on "Subsequent work"! Observe the correct tightening torque. → 4X00IN TIGHTENING TORQUES FOR FRONT AXLE
5. Left side: Replace the plastic protective ring on the transmission side, which you broke off during removal.
6. Use a new sealing ring in the rear axle differential and a new protective ring and circlip on the drive shaft.
7. Fit the wheel bearing housing (second mechanic required). First, fit the drive shaft on the rear axle differential housing with a quick, strong tap.

   To make installation easier, raise the wheel carrier slightly with a universal jack! Use a rubber base to prevent the wheel carrier from slipping! → Tie rod assembly aid (shown as an example) 

   Fig 5: Adjusting Tie Rod Assembly Aid

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8. Fit the screws -1, 2-  on the inside of the two upper wishbones. → 4X00IN TIGHTENING TORQUES FOR REAR AXLE
   Fig 6: Identifying Threaded Joint On Inner Wishbones

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9. Fit the lower trailing arm -2-  on the wheel bearing housing -1-  . → 421119 REMOVING AND INSTALLING LOWER TRAILING ARM  , → 4X00IN TIGHTENING TORQUES FOR REAR AXLE
   Fig 7: Identifying Screws On Lower Trailing Arm

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10. Fit the tie rod (toe control arm) on the wheel bearing housing. → 420919 REMOVING AND INSTALLING TIE ROD (TOE CONTROL ARM)  , → 4X00IN TIGHTENING TORQUES FOR REAR AXLE
11. Fit the spring strut on the wheel bearing housing. → Installing Rear Spring Strut (Steel Springs)  , → 4X00IN TIGHTENING TORQUES FOR REAR AXLE
12. Fit the brake disc if necessary. → Installing Rear Brake Disc

    Fit the brake calliper. → Installing Rear Brake Calliper

13. Plug in the central connector -1-  for the ABS wire harness -A-  and lock it -a-  .
    Fig 8: Locating Central Connector For Wheel Bearing Housing - ABS Wire Harness

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14. Clip the mounting -2-  for the ABS wire harness into the position designed for it -3-  on the body -B-  .