BMW Coupes and Sedans 1970-1988 Repair Guide

Power Steering Pump

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See Figure 1

REMOVAL & INSTALLATION



Except 7 Series
  1. Disconnect the negative battery cable. Release the pressure from the reservoir.
  2.  
  3. Draw the hydraulic fluid from the pump reservoir. Disconnect and plug the hydraulic lines.
  4.  
  5. Disconnect and plug the hydraulic lines. Remove the bolts and loosen the nuts to turn the adjusting pinion.
  6.  
  7. Remove the drive belt.
  8.  
  9. Remove the bolts from the brackets holding the pump and remove the pump assembly.
  10.  
  11. Reverse the removal procedure for installation. Tighten the adjusting pinion to 6 ft. lbs. (8 Nm).
  12.  
  13. If equipped with a tandem pump the removal and installation procedure is the same.
  14.  

733i AND 735i MODELS

If the pump is damaged, the pressure control regulator must also be replaced.

  1. Discharge the hydraulic accumulator, by depressing the brake pedal with the force required for full stop breaking (about 20 times).
  2.  
  3. Use a syringe to draw the fluid out of the pump reservoir and discard it. Detach all hoses at the pump and plug the openings.
  4.  
  5. Loosen the 2 locknuts and turn the adjusting pinion nut to release the belt tension. Remove the drive belt.
  6.  
  7. Remove the bolts from the brackets holding the pump in place at both top and bottom.
  8.  
  9. Install the pump and its mounting bolts. Reconnect the hoses to the pump in such a way that they will not rub against body parts. Note that on 1983-88 models, the belt tension is released or tightened by unscrewing the splash guard, loosening the locknut and bolts at top and bottom of the pump, and then turning the geared locking element.
  10.  
  11. In adjusting the belt, tighten this locking element in the tightening direction to 69-73 in. lbs. and then tighten the locknut. Use new seals on the hydraulic lines.
  12.  

Run the engine 10 minutes and turn the steering wheel several times from stop to stop. Operate the brake booster quickly, to obtain hard resistance, about 10 times to discard the oil leaving the return hose.

  1. Stop the engine, drain the oil from the tank and connect the booster return hose on the tank.
  2.  

BELT ADJUSTMENT



Tighten the belt so that when pressure is applied to the belt, the distance between both belt pulleys is 0.2-0.4 inches (5-10mm).

On 1983-88 733i and 735i models tighten the geared locking element in the tightening direction to 69-73 in. lbs. (8-9 Nm) and then tighten the locknut.

SYSTEM BLEEDING



Without Ride Height Control
  1. Fill the reservoir to the edge with the proper fluid.
  2.  
  3. Start the engine and all oil until the oil level remains constant.
  4.  
  5. Turn the steering wheel from lock to lock quickly until air bubbles are no longer present in the reservoir.
  6.  
  7. On models incorporating a combination power steering and power brake system, operate the brake pedal to discharge the hydraulic accumulator until the oil level stops rising or noticeable resistance on the brake pedal is felt.
  8.  

With Ride Height Control
  1. Fill the reservoir to the level of the strainer.
  2.  
  3. Rotate the steering in both directions fully at least 2 times.
  4.  
  5. Raise the vehicle so the rear wheels are off the ground.
  6.  
  7. Check the oil level. The level should be about 1 / 4 in. (5 mm) above the strainer after 2 minutes. Fill to the specified mark, if necessary.
  8.  



Click image to see an enlarged view

Fig. Fig. 1: Exploded view of standard power steering pump

 
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