Power Steering Pump

From BMW E34 Encyclopedia

Overview[edit]

The only thing you will have to worry about is aligning the power steering lines without stripping the pump's threads.

Instructions[edit]

  • Use a pump to drain all the fluid out in a container from power steering reservoir, make sure you have new CHF fluid
  • You can also replace the V-Belt during this job
  • Jack the car up in the front and secure it on jack stands
  • Position the drain bucket under the power steering pump
  • Open the drain with a hex socket and let the fluid pour out
  • Close the drain
  • Remove the big power steering line from the rear of the power steering pump. Expect additional fluid to pour out. Careful, this fluid does not like paint
  • Remove the smaller line from the side of the power steering pump. The bolt holding this hose is 17mm
  • Remove two bolts that are holding the pump in the front. Use a small extension or a wrench for this
  • Remove the long bolt that holds the top part of the pulley and extends all the way to the back
  • Carefully slide the pulley off towards the radiator and take it out

Installation / Aligning Hoses[edit]



You will most likely have problems with alignment of the power steering hoses while torquing down the bolts. Use a carb cleaner or warm soap and water to clean all of the areas. We want to prevent the dirt particles from getting into the system. Clean conditions also help with spotting the leaking fluid.

DO NOT USE ANY TOOLS WHEN TIGHTENING IN THE BANJO POWER STEERING BOLTS -- HAND TIGHTENING ONLY or you will risk of stripping the threads on your $400 pump.

The banjo bolts should not offer any resistance if the alignment is correct.

YOU SHOULD BE ABLE TO TIGHTEN THE BOLTS BY HAND WITH EASE UNTIL THE POWER STEERING LINE IS FLUSH AGAINST THE PUMP! IF THERE IS ANY RESISTANCE STOP, THE BOLT IS NOT ALIGNED, OR THE STEERING LINE IS PULLING TOO HARD TO A CERTAIN DIRECTION

  • Try to position pump in place and let it hang slightly on the top of the long threaded bolt. This should make the alignment easier
  • Start with the rear (bigger) line and align the pump until it is flush with the line
  • Use your hands to tighten the bolt
  • If the bolt is not straight, the line is not correctly aligned. Start over
  • If there is too much resistance and you cannot turn it by hand, try pushing the line to a side. This should relieve the pressure off the bolt
  • Repeat the steps for a smaller line that connects to the side of the pump

Bleeding[edit]

  • Put the new fluid in the reservoir and leave the cap off
  • Start the car and carefully check for the leaks
  • Put the steering wheel all the way to the left, wait 1-2 seconds and steer all the way to the right. Hold for another 1-2 seconds
  • Repeat this four to six times
  • Check the fluid level and top up if needed
  • The fluid should be relatively bubble free. The bubbles indicate that there is air in the system

Torque Specifications[edit]

  • Pulley to the power steering pump (a total of 3 bolts): 15 Nm
  • Front bolts connecting the power steering pulley to the engine: 25 Nm
  • The big power steering line in the rear of the pump: 45 Nm
  • The smaller power line on the side of the pump: 42 Nm