BMW 318/325/M3/525/535/M5 1989-1993 Repair Information

Power Steering Rack/Gear

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REMOVAL & INSTALLATION



E30 3 Series

See Figures 1 and 2



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Fig. Fig. 1: Exploded view of rack assembly-E30 3 Series



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Fig. Fig. 2: Place the spring washers between steering coupling and joint-E30 3 Series

2 WHEEL DRIVE
  1. Raise and support the front end of the vehicle. Remove the front wheels.
  2.  
  3. Remove the steering wheel. Remove the steering rack coupling bolt. Loosen the upper bolt so the coupling can be disconnected from the steering rack.
  4.  
  5. Remove the power steering fluid from the reservoir and discard. Disconnect and plug the fluid return line from the rack. Remove the pressure line hollow bolt from the rack and plug.
  6.  
  7. Disconnect the tie rods from the steering knuckles. Remove the steering rack mounting bolts. Note which holes the steering rack was mounted to. If equipped, disconnect the engine mounts located above the steering rack.
  8.  
  9. Raise the engine about 2 in. (50mm) and remove the steering rack.
  10.  

To install:
  1. Install the steering gear. Use the rear holes in the crossmember or the ones originally used if not the rear holes. Lower the engine.
  2.  
  3. Torque the steering gear bolts to 30 ft. lbs. (42 Nm). Torque the engine mount nuts to 16 ft. lbs. (22 Nm) for M8 bolts and 30 ft. lbs. (42 Nm) for M10 bolts.
  4.  
  5. Connect the tie rods to the steering knuckles and torque the nuts to 23-29 ft. lbs. (33-40 Nm). Do not use a locknut on a joint that has a hole for a cotter pin. If originally equipped with a locknut, use a new locknut for installation.
  6.  
  7. Connect the return line to the steering rack. Connect the pressure line to the steering rack using new crush washers. Torque the hollow bolt to 7 ft. lbs. (10 Nm) for M10 bolts and 14.5 ft. lbs. (20 Nm) for M12 bolts.
  8.  
  9. Align the mark on the steering rack shaft with the mark on the rack housing. Align the slot of the universal joint with the shaft and housing marks. This is the centered position. Install the bolts and torque to 16 ft. lbs. (22 Nm).
  10.  
  11. Install the steering wheel in the centered position.
  12.  
  13. Fill and bleed the power steering reservoir. Have the alignment checked.
  14.  

4 WHEEL DRIVE

To remove the steering gear on 4WD vehicles, use a special tool to support the engine via the body. It is also advisable to use a special tool to support the front axle carrier without damaging it. It is necessary to remove the entire front axle carrier to gain access to the mounting bolts for the steering gear on this vehicle.

  1. Raise the vehicle and support it securely. Remove the splash guard. Remove the front wheels.
  2.  
  3. Remove the air cleaner. Use a clean syringe to remove the power steering fluid from the pump reservoir.
  4.  
  5. Attach the support tool and connect it to the engine hooks to be sure the engine is securely supported.
  6.  
  7. Remove the through bolts from the right and left engine mounts.
  8.  
  9. Disconnect both the hydraulic lines running from the power steering pump to the steering gear, and then plug the openings.
  10.  
  11. Loosen both the retaining bolts and then disconnect the steering column spindle off the steering gear.
  12.  
  13. Remove the retaining nuts on both sides and then press the tie rod ends off the steering knuckles with the proper tools. Be careful to keep grease out of the bores and off the tie rod ball studs.
  14.  
  15. Remove the cotter pins, remove the retaining nuts on both sides and then use the proper tool to press the control arm ball joint studs out of the steering knuckles. Be careful to keep grease out of the bores and off the control arm ball studs.
  16.  
  17. Remove the bolts on either side attaching the control arm brackets to the body.
  18.  
  19. Remove the bolts and remove the stabilizer bar mounting brackets from the front axle carrier on both sides.
  20.  
  21. Support the front axle carrier with a suitable jacking device. Then, remove the mounting bolts on either side and remove the axle carrier. Remove the mounting bolts and remove the steering gear from the axle carrier.
  22.  

To install:
  1. Install in reverse order, noting these points:
    1. Clean the bores into which the axle carrier bolts are mounted. Use some sort of locking sealer and torque the bolts to 30 ft. lbs. (41 Nm).
    2.  
    3. Torque the mounting bolts holding the steering gear to front axle carrier to 30 ft. lbs. (41 Nm).
    4.  
    5. Install new cotter pins on the retaining nuts for the control arm ball studs. Torque to 61.5 ft. lbs. (84 Nm).
    6.  
    7. Replace the self-locking nuts on the tie rod end ball studs and connecting the steering column spindle to the steering box. Torque tie rod ball stud nuts to 24-29 ft. lbs. (33-40 Nm).
    8.  
    9. Replace the gaskets on power steering hydraulic lines.
    10.  

  2.  
  3. Refill the fluid reservoir with specified fluid. Idle the engine and turn the steering wheel back and forth until it has reached right and left lock 2 times each. Then, turn off the engine and refill the reservoir.
  4.  

E36 3 Series
  1. Raise and support the front end of the vehicle. Remove the front wheels.
  2.  
  3. Remove the steering wheel. Remove the steering rack coupling bolt. Loosen the upper bolt so the coupling can be disconnected from the steering rack.
  4.  
  5. Remove the power steering fluid from the reservoir and discard. Disconnect and plug the fluid return line from the rack. Remove the pressure line hollow bolt from the rack and plug.
  6.  
  7. Disconnect the tie rods from the steering knuckles. Remove the steering rack mounting bolts. Note which holes the steering rack was mounted to. If equipped, disconnect the engine mounts located above the steering rack.
  8.  
  9. Raise the engine about 2 in. (50mm) and remove the steering rack.
  10.  

To install:
  1. Install the steering gear. Use the rear holes in the crossmember or the ones originally used if not the rear holes. Lower the engine.
  2.  
  3. Torque the steering gear bolts to 30 ft. lbs. (42 Nm). Torque the engine mount nuts to 16 ft. lbs. (22 Nm) for M8 bolts and 30 ft. lbs. (42 Nm) for M10 bolts.
  4.  
  5. Connect the tie rods to the steering knuckles and torque the nuts to 23-29 ft. lbs. (33-40 Nm). Do not use a locknut on a joint that has a hole for a cotter pin. If originally equipped with a locknut, use a new locknut for installation.
  6.  
  7. Connect the return line to the steering rack. Connect the pressure line to the steering rack using new crush washers. Torque the hollow bolt to 7 ft. lbs. (10 Nm) for M10 bolts and 14.5 ft. lbs. (20 Nm) for M12 bolts.
  8.  
  9. Align the mark on the steering rack shaft with the mark on the rack housing. Align the slot of the universal joint with the shaft and housing marks. This is the centered position. Install the bolts and torque to 16 ft. lbs. (22 Nm).
  10.  
  11. Install the steering wheel in the centered position.
  12.  
  13. Fill and bleed the power steering reservoir. Have the alignment checked.
  14.  

E34 5 Series

See Figure 3



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Fig. Fig. 3: Mounting of the power steering gear-E34 5 Series

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the steering wheel, if equipped with an air bag (SRS).
  4.  
  5. Discharge the pressure reservoir by pushing in on the brake pedal about 10 times or until the pedal feels hard. Draw off hydraulic fluid in the supply tank.
  6.  
  7. Unscrew the bolt and press the tie rod off the steering drop arm with the proper tool.
  8.  
  9. Remove the heat shield on the steering gear and disconnect the ride level height control pipes, if equipped.
  10.  
  11. Remove the bolt and push the U-joint from the steering gear. Disconnect and plug the hydraulic lines.
  12.  
  13. Unscrew the steering gear mounting bolts and remove the steering gear.
  14.  

If necessary, move the steering drop arm by turning the steering stub to enable the removal of the gear assembly.

To install:
  1. Install the steering gear and tighten the mounting bolts. Torque the M10 bolts to 30 ft. lbs. (42 Nm) and the M12 bolts to 52-64 ft. lbs. (72-88 Nm).
  2.  
  3. Connect the hydraulic lines, using new seals. Torque the M14 bolts to 25 ft. lbs. (35 Nm) and the M16 bolts to 29 ft. lbs. (40 Nm).
  4.  
  5. Turn the steering wheel counterclockwise or clockwise against the stop and then it back about 1.7 turns until the marks are aligned.
  6.  
  7. Connect the U-joint to the steering gear making sure the bolt is in the locking groove of the steering stub.
  8.  
  9. Install the tie rod to the steering drop arm and replace the self locking nut.
  10.  
  11. Replace the heat shield on the steering gear and connect the ride level height control pipes if equipped.
  12.  
  13. Refill the hydraulic fluid and replace the steering wheel, if equipped with an air bag (SRS).
  14.  
  15. Connect the negative battery cable.
  16.  

ADJUSTMENT



E34 5 Series
  1. Remove the steering wheel center or the air bag.
  2.  
  3. With the front wheels in the straight ahead position, remove the cotter pin and loosen the castle nut.
  4.  
  5. Press the center tie rod off the steering drop arm.
  6.  
  7. Turn the steering wheel to the left about 1 turn. Install a friction gauge and turn the wheel to the right, past the point of pressure and the gauge should read 0.72-0.87 ft. lbs.
  8.  
  9. To adjust, turn the steering wheel about 1 turn to the left. Loosen the counter nut and turn the adjusting screw until the specified friction is reached when passing over the point of pressure.
  10.  

 
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