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BMW E39 Power Steering Reservoir Removal
 
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Pelican Technical Article:

BMW E39 Power Steering Reservoir Removal

Kerry Jonsson

Time:

2 hours2 hrs

Tab:

$100

Talent:

***

Tools:

10mm wrench or socket with ratchet, small thin pick or diagonal cutting pliers, flat head screwdriver

Applicable Models:

BMW 525i Sedan/Wagon (2001-03)
BMW 528i Sedan/Wagon (1997-00)
BMW 530i Sedan (2001-03)
BMW 540i Sedan/Wagon (1997-03)

Parts Required:

Power Steering Reservoir

Hot Tip:

Use suction tool to remove fluid before removing reservoir

Performance Gain:

Leaking reservoir, stops whining pump due to cavitation

Complementary Modification:

Flush power steering fluid.

A power steering system uses hydraulic fluid that is pressurized by a pump to assist in the movement of the steering linkage. These hydraulic systems can hold pressure from 2000, to 3000psi. This system like any system that uses a fluid can leak and lose fluid over time. If you run your power steering pump without fluid you can easily damage the pump. Also, any debris can build up in the hydraulic system and block fluid flow from the reservoir to the pump. If the pump starves for fluid it will suck in air and cause "cavitation" which will cause the pump to whine. If your reservoir is leaking or clogged replace it. In this tech article we will go over all the steps to replace you power steering pump reservoir.

Power Steering Reservoir Removal Eight Cylinder:
Use a 10mm socket w/ratchet or wrench and remove the pinch bolt that causes the bracket to pinch and hold the reservoir in place.
Figure 1

Use a 10mm socket w/ratchet or wrench and remove the pinch bolt that causes the bracket to pinch and hold the reservoir in place.

One way to make it easier to access the hoses is to remove the mounting bracket entirely.
Figure 2

One way to make it easier to access the hoses is to remove the mounting bracket entirely. Remove the two 10mm fasteners (green arrows) that mount the bracket to the body. Move the bracket out of the way.

Be careful not to lose the two bushings (green arrows) that fit into the rubber mounts.
Figure 3

Be careful not to lose the two bushings (green arrows) that fit into the rubber mounts.

Lift the reservoir and look at the two clamps for the hoses.
Figure 4

Lift the reservoir and look at the two clamps for the hoses. One clamp has been replaced with an adjustable hose clamp (green arrow) and the original clamp is a band clamp (yellow arrow). Mark the hoses so you donÂ't mistake them when you reinstall them.

Use a flat head screw driver to remove the hose clamp and remove the hose.
Figure 5

Use a flat head screw driver to remove the hose clamp and remove the hose.

I use a straight pick and fit it into the gap of the band clamp.
Figure 6

I use a straight pick and fit it into the gap of the band clamp. Rock it side to side in the direction of the blue arrows to gradually loosen the clamp. If you have a new band clamp you can cut off the old clamp with diagonal cutting pliers. You can then remove the hose. Fit both hoses on the reservoir and tighten the clamps whichever ones you decide to use. Position the bracket around the reservoir and mount it to the two pins on the body. Tighten the two mounting fasteners and the pinch bolt on the bracket. Fill the system with the appropriate power steering fluid, start the engine and turn the steering wheel from lock to lock to purge the air out of the system. Shut off the engine and let the car sit while the air bubbles lift out of the fluid in the reservoir.

Power Steering Reservoir Removal Six Cylinder:

The following pictures show the air filter housing removed from the car. This was done for photographic purposes. You do not have to remove the air filter housing but it does give you more room to work. See our tech article on removing the air filter housing.
Use a 10mm socket w/ratchet or wrench to remove the pinch bolt that pinches the bracket around the reservoir.
Figure 7

Use a 10mm socket w/ratchet or wrench to remove the pinch bolt that pinches the bracket around the reservoir.

Remove the two 13mm fasteners (green arrows) that mount the reservoir to the oil filter housing and remove the bracket from the reservoir.
Figure 8

Remove the two 13mm fasteners (green arrows) that mount the reservoir to the oil filter housing and remove the bracket from the reservoir.

Look at the two clamps that attach the hoses to the reservoir.
Figure 9

Look at the two clamps that attach the hoses to the reservoir. One clamp has been replaced with an adjustable one and the other is the original band clamp.

Use a flat head screwdriver to remove the adjustable clamp from the reservoir.
Figure 10

Use a flat head screwdriver to remove the adjustable clamp from the reservoir.

Loosen the band clamp with a pick and wiggle it back and forth as described in step 6 until the clamp is loose, then remove the hose.
Figure 11

Loosen the band clamp with a pick and wiggle it back and forth as described in step 6 until the clamp is loose, then remove the hose. If you have a new band clamp you can cut the old one with diagonal cutting pliers. Installation is the reverse of the removal steps. Install the hoses and tighten the clamps. Fit the bracket around the reservoir and mount it to the oil filter housing. Attach the pinch bolt and tighten all mounting bolts. Fill the system with BMW approved power steering fluid. Start the engine and turn the steering wheel from lock to lock to purge the system of air. Shut off the engine to allow the air to rise out of the fluid. Repeat this process until the power steering pump is quiet.

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Page last updated: Fri 12/9/2016 02:04:49 AM