BMW Cars 1999-06

Wheel Bearings

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Adjustment



Wheel bearings can not be adjusted. The rear bearings must be replaced as a unit and never be reused once removed. The front wheel bearings are pressed into the hub and are not available separately. If a front wheel bearing is in need of replacement, it is replaces as a unit with the hub.

Wheel bearings can not be adjusted. The rear bearings must be replaced as a unit and never be reused once removed. The front wheel bearings are pressed into the hub and are not available separately. If a front wheel bearing is in need of replacement, it is replaces as a unit with the hub.

Wheel bearings can not be adjusted. The front wheel bearings are pressed into the hub and are not available separately. If a front wheel bearing is in need of replacement, it is replaces as a unit with the hub.

Removal & Installation



This procedure is for 2 wheel drive vehicles. For hub and bearing replacement procedures for 4 wheel drive vehicles (325iX models), refer to Section 7.


NOTE
The wheel bearings are only removed if they are worn. They cannot be removed without destroying them (due to side thrust created by the bearing puller). They are not periodically disassembled, repacked and adjusted.

  1. Loosen the lug bolts slightly, then raise and safely support the vehicle.
  2.  
  3. Remove the front wheel(s).
  4.  
  5. Remove the front brake caliper, caliper bracket and brake rotor. Make sure to support the caliper. Do not allow the caliper hang and put tension on the brake hoses.
  6.  
  7. Using a suitable chisel, carefully remove the metal protective cap from the hub by wedging the chisel between the cap's outer lip and the hub.
  8.  
  9. Using a chisel, knock the tab on the collar nut away from the spindle. Using a 1 / 2 inch drive 46mm (1 13 / 16 inch) socket and a suitable breaker bar, remove the nut by turning it counterclockwise. Discard the nut.
  10.  
  11. Remove the hub by hand, of if necessary, us a bearing puller set such as 31 2 101/102/104 and discard the hub. On the M3 models, if necessary, use a puller set such as 31 2 102/105/106. On the M3 models, install the main bracket of the puller with 3 wheel bolts.
  12.  
  13. If the inside bearing inner race remains on the stub axle, unbolt and remove the dust guard. Bend back the inner dust guard and pull the inner race off with a special tool capable of getting under the race (BMW 00 7 500 and 33 1 309 or equivalent). Reinstall the dust guard.
  14.  



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Fig. Wheel bearings can not be adjusted. The bearings must be replaced as a unit and never be reused once removed from the spindle



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Fig. The brake caliper and rotor are removed when replacing the hub/bearing assembly



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Fig. Use a hex socket to remove the rotor mounting fastener. If it is difficult to remove . . .



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Fig. . . . use a hand-held impact driver to break it loose



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Fig. This brake rotor was corroded in place, so the rotor mounting bolt was loosened 3 turns and . . .



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Fig. . . . shocked loose by striking the face with a repetition of sharp sudden blows. Be careful to not hit the brake rotor's machined surface



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Fig. Using a chisel, work around the dust cap to carefully remove it



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Fig. Once the dust cap is loosened, remove the cap to access the spindle nut



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Fig. The spindle nut must be replaced upon removal. Use a sturdy six point 46mm (1 13/16 inch) socket and large breaker bar to remove it



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Fig. Once the spindle nut is removed, the hub/bearing assembly slide off the spindle. Note the notched ring for the ABS sensor, and the slots in the spindle for locking the spindle nut

To install:

  1. If the dust guard has been removed, install a new one. Install a special tool (BMW 31 2 120 or equivalent; on M3, use 31 2 110 or equivalent) over the stub axle and screw it in for the entire length of the guide sleeve's threads. Press the bearing on.
  2.  
  3. Once the hub/bearing assembly is installed, tighten the wheel hub collar nut to 213 ft. lbs. (290 Nm). Lock the collar nut by bending over the tab into the slot in the spindle.
  4.  
  5. The balance of the assembly is in reverse order of removal.
  6.  



Click image to see an enlarged view

Fig. Cut away view of the front wheel bearing


NOTE
The wheel bearings are only removed if they are worn. They cannot be removed without destroying them (due to side thrust created by the bearing puller). They cannot be disassembled, repacked or adjusted.

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Front wheel
     
    Caliper, then suspend the brake caliper to avoid putting stress on the brake line
     
    Setscrew, with a suitable hex wrench
     
    Brake disc, then the dust cover suing a suitable prytool or chisel to remove the pressed on cover
     

  4.  
  5. Using a suitable chisel, knock the tab on the collared nut away from the shaft. Remove and discard the nut.

    The bearing with a puller set tool Nos. 31-2-101/102/104 or their equivalents and discard it. On M3 models, use a puller set tool No. 31-2-102/105/106 or their equivalents. On M3 models, install the main bracket of the puller with 3 wheel bolts.
     

  6.  
  7. If the inside bearing inner race remains on the stub axle, unbolt and remove the dust guard. Bend back the inner dust guard and pull the inner race off using tool No. 00-7-500 and 33-1-309 or their equivalents, which are capable of getting under the race to remove it. Reinstall the dust guard.
  8.  

To install:

  1. If the dust guard has been removed, install a new one. Install tool No. 31-2-120; except the M3 models, which require tool No. 31-2-110. Place the tool over the stub axle and screw it in the entire length of the guide sleeve's threads, then press the bearing on.
  2.  
  3. Reverse the remaining removal procedures to install the disc and caliper. Using a new collared mounting nut, tighten the wheel hub collar nut to 210 ft. lbs. (290 Nm). Lock the collar nut by bending over the tab into the groove of the spindle.
  4.  

Both the front and rear wheel bearings are sealed units. The front wheel bearings are replaced as a hub unit. The rear wheel bearings are pressed into the trailing arm.



Click image to see an enlarged view

Fig. Cut away view of the front wheel bearing


NOTE
The wheel bearings are only removed if they are worn. They cannot be removed without destroying them (due to side thrust created by the bearing puller). They cannot be disassembled, repacked or adjusted.

  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Remove or disconnect the following:

    Front wheel. Remove the attaching bolts and remove, then suspend the brake caliper to avoid putting stress on the brake line.
     
    Setscrew, with a suitable hex wrench. Remove the brake disc, then remove the dust cover suing a suitable prytool or chisel to remove the pressed on cover.
     

  4.  
  5. Using a suitable chisel, knock the tab on the collared nut away from the shaft. Remove and discard the nut.
  6.  
  7. Remove the bearing with a puller set tool Nos. 31-2-101/102/104 or their equivalents and discard it. On M3 models, use a puller set tool No. 31-2-102/105/106 or their equivalents. On M3 models, install the main bracket of the puller with 3 wheel bolts.
  8.  
  9. If the inside bearing inner race remains on the stub axle, unbolt and remove the dust guard. Bend back the inner dust guard and pull the inner race off using tool No. 00-7-500 and 33-1-309 or their equivalents, which are capable of getting under the race to remove it. Reinstall the dust guard.
  10.  

To install:

  1. If the dust guard has been removed, install a new one. Install tool No. 31-2-120; except the M3 models, which require tool No. 31-2-110. Place the tool over the stub axle and screw it in the entire length of the guide sleeve's threads, then press the bearing on.
  2.  
  3. Reverse the remaining removal procedures to install the disc and caliper. Using a new collared mounting nut, tighten the wheel hub collar nut to 210 ft. lbs. (290 Nm). Lock the collar nut by bending over the tab into the groove of the spindle.
  4.  

  1. Raise and safely support the vehicle. Remove the tire and wheel assembly.
  2.  
  3. Remove the attaching bolts and remove and suspend the brake caliper, hanging it from the body so as to avoid putting stress on the brake line.
  4.  
  5. Remove the setscrew with an Allen® wrench. Pull off the brake disc and pry off the dust cover with a small prybar.
  6.  
  7. Using a chisel, knock the tab on the collar nut away from the shaft. Unscrew and discard the nut.
  8.  
  9. Using the proper tool, pull off the bearing and discard it.
  10.  

To install:

  1. If the inside bearing inner race remains on the stub axle, unscrew and remove the dust guard, using a socket extension. Bend back the inner dust guard and pull the inner race off with a special tool capable of getting under the race. Reinstall the dust guard and install a new dust cover.
  2.  
  3. Then install a special tool over the stub axle and screw it in for the entire length of the guide sleeve's threads. Slide the bearing on and follow it with the proper tool and use this tool to press the bearing on.
  4.  
  5. Reverse the remaining removal procedures to install the disc and caliper. Torque the wheel hub collar nut to 210 ft. lbs. (285 Nm). Lock the collar nut by bending over the tab.
  6.  
  7. Install a new grease cap coated with a suitable sealer.
  8.  



Click image to see an enlarged view

Fig. Cut away view of the front wheel bearing


NOTE
The wheel bearings are only removed if they are worn. They cannot be removed without destroying them (due to side thrust created by the bearing puller). They cannot be disassembled, repacked or adjusted.

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Front wheel
     
    Caliper, then suspend the brake caliper to avoid putting stress on the brake line
     
    Setscrew, with a suitable hex wrench
     
    Brake disc, then the dust cover suing a suitable prytool or chisel to remove the pressed on cover
     

  4.  
  5. Using a suitable chisel, knock the tab on the collared nut away from the shaft. Remove and discard the nut.

    The bearing with a puller set tool Nos. 31-2-101/102/104 or their equivalents and discard it. On M3 models, use a puller set tool No. 31-2-102/105/106 or their equivalents. On M3 models, install the main bracket of the puller with 3 wheel bolts.
     

  6.  
  7. If the inside bearing inner race remains on the stub axle, unbolt and remove the dust guard. Bend back the inner dust guard and pull the inner race off using tool No. 00-7-500 and 33-1-309 or their equivalents, which are capable of getting under the race to remove it. Reinstall the dust guard.
  8.  

To install:

  1. If the dust guard has been removed, install a new one. Install tool No. 31-2-120; except the M3 models, which require tool No. 31-2-110. Place the tool over the stub axle and screw it in the entire length of the guide sleeve's threads, then press the bearing on.
  2.  
  3. Reverse the remaining removal procedures to install the disc and caliper. Using a new collared mounting nut, tighten the wheel hub collar nut to 210 ft. lbs. (290 Nm). Lock the collar nut by bending over the tab into the groove of the spindle.
  4.  

 
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