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Power Steering Pump Replacement
 
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Pelican Technical Article:

Power Steering Pump Replacement

Nick Czerula

Time:

4 hours4 hrs

Tab:

$300

Talent:

*****

Tools:

Set of sockets (10mm, 13mm), wrenches 19mm, screwdrivers, floor jack, wheel chocks, safety glasses, torque wrench

Applicable Models:

BMW 525i/xi Sedan (2004-07)
BMW 528i/xi Sedan (2008-10)
BMW 530i/xi Sedan (2004-07)
BMW 530xi Wagon (2006-07)
BMW 535i/xi Sedan (2008-10)
BMW 535xi Wagon (2008)
BMW 545i Sedan (2004-05)
BMW 550i Sedan (2006-10)

Parts Required:

Power steering pump, power steering fluid, power steering hose clamp, serpentine belts, High pressure line O-ring

Hot Tip:

Work with a cool engine

Performance Gain:

Quit power steering pump, remedy power steering leaks

Complementary Modification:

Change power steering fluid reservoir

The steering system used in the BMW E60 is known as power-assisted rack-and-pinion steering. Rotating the steering wheel spins a small pinion gear, thus sliding a toothed rack left or right. The ends of the rack attach to tie-rods that steer the front wheels. A hydraulic pump, powered by the engine accessory belt, forces steering fluid into hoses leading to pistons in the steering rack. A hydraulic valve in the steering rack varies the hydraulic fluid pressure in the two cylinders, dependent on how fast or forcefully the pinion gear is rotated. This multiplies the driver's force in steering the wheels.

An optional active steering system varies the force multiplication of power steering depending on vehicle speed. At low speeds steering assist (force multiplication) is at a maximum to aid in low speed driving and parking. At high speed steering assist is reduced. In addition, at high speeds (above 75 mph or 120 kph) the active steering microprocessor reduces driver input into the steering system in order to prevent the transmission of unintended rapid steering movement to the front wheels.

When a power steering pump begins to fail, it will emit a groan when steering from side to side. Or you will notice increased steering effort. Of course, the pump could leak also, but a noisy and weak pump is most common. Inside the power steering fluid reservoir there is a small filter that can become restricted. The filter is not serviceable separately; if you believe it to be the problem, replace the power steering fluid reservoir. See our tech article on power steering fluid reservoir replacing. If you lose function of your power steering or it takes a greatly increased effort to steer your vehicle, remove the drive belt and inspect the power steering pump shaft. If you can slide the pulley out of the power steering pump, the shaft is broken. You will have to replace the power steering pump.

In this article, I'll go over the steps involved with replacing and bleeding the power steering pump.

Keep in mind that when your car was serviced before, parts may have been replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have, so be prepared with different size sockets and wrenches.

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If you're working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Do not work on your vehicle if you feel the task is beyond your ability.

Vehicle models change and evolve, as they grow older, so the vehicle shown in our illustrations may vary slightly from yours. If something seems different, let us know and share your info to help other users. Do you have questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

Raise and support the front of your vehicle safely. See our tech article on jacking up your car.

The power steering pump on BMW E60 models with an M54 engine is mounted to the lower left side of the engine (red arrow).
Figure 1

The power steering pump on BMW E60 models with an M54 engine is mounted to the lower left side of the engine (red arrow). To access it, begin by removing the engine splash shields. See our tech article on engine splash shield reinforcement plate removing.

Use a suction pump (red arrow) to suck the power steering fluid out of the reservoir.
Figure 2

Use a suction pump (red arrow) to suck the power steering fluid out of the reservoir.

Remove the engine drive belt from the alternator pulley and lay it aside.
Figure 3

Remove the engine drive belt from the alternator pulley and lay it aside. See our tech article on engine drive belt replacing.

Working under your vehicle at the front corner, use a 19 mm wrench to remove the PS pump high-pressure line (red arrow).
Figure 4

Working under your vehicle at the front corner, use a 19 mm wrench to remove the PS pump high-pressure line (red arrow). The high-pressure steering line is sealed with an O-ring. Be careful not to lose the O-ring when removing the line. It can get stuck in the pump and fall out when the pump is removed. Once the line is removed, inspect the O-ring and replace it if necessary (O-ring is available separately). Next, using a pair of diagonal cutters, cut the power steering return hose clamp. Then remove the return hose from the pump (green arrow). Remove the hose slowly. Have an oil pan ready to catch the PS fluid.

Next remove the alternator idler pulley.
Figure 5

Next remove the alternator idler pulley. Remove the plastic idler pulley cap (green arrow) using a flathead screwdriver. Then remove the T45 Torx fastener (red arrow). Then remove the pulley from the engine. Once the pulley is removed, remove the two 13mm power steering pump fasteners (yellow arrows). Both fasteners are on the top-sides of the pulley. See the next photo for a view with the alternator removed.

This photo shows the top of the power steering pump with the alternator removed.
Figure 6

This photo shows the top of the power steering pump with the alternator removed. The green arrows point to the two front and one-rear power steering pump fasteners. Once the front fasteners have been removed, remove the rear fastener. The fasteners are different lengths. Mark the locations for help when reinstalling.

This photo shows the bottom of the power steering pump, looking up at the rear fastener (yellow arrow).
Figure 7

This photo shows the bottom of the power steering pump, looking up at the rear fastener (yellow arrow). Remove the rear fastener. With the fasteners removed, push the power steering pump down and away from the oil filter-housing bracket. Once the power steering pump is separated from the oil filter housing, remove it from the engine compartment.

Place the power steering pump on the work bench.
Figure 8

Place the power steering pump on the work bench. Remove the 13mm pulley mounting fasteners (green arrows). Then transfer the pulley over to the new power steering pump. The pump pulley is made of plastic. Be careful when removing. If the pulley is stuck, work it side to side. Do not use excessive force.

Once the pulley is removed, transfer the power steering pump-mounting bracket from the old pump to the new one.
Figure 9

Once the pulley is removed, transfer the power steering pump-mounting bracket from the old pump to the new one. Remove the T40 Torx fasteners (yellow arrows) and install the brackets on the new pump. Next, install the pulley onto the new power steering pump. Then lower the new power steering pump into the engine compartment. Install the power steering pump fasteners and tighten. Then reassemble the remaining items in the reverse order of removal. Once complete, fill and bleed the power steering system as noted below.

Bleeding power steering pump: Before starting the engine, fill the power steering reservoir with clean fluid to the MAX level on the dipstick.
Figure 10

Bleeding power steering pump: Before starting the engine, fill the power steering reservoir with clean fluid to the MAX level on the dipstick. Start the engine and turn the steering wheel fully left and right three times. Turn the engine off, check the fluid level and add fluid until it reaches MAX on the dipstick. When full, the fluid should be clear and foam free. Foam or bubbles is a sign of air in the system.

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Comments and Suggestions:
george Comments: hello, how do you remove the front triangle plate so that i can replace the front seal on a zf power steering pump for my 2005 525i with active steering.
April 18, 2016
  Followup from the Pelican Staff: You need to replace the pump. The pump pis not serviceable. Give our parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 

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Page last updated: Mon 12/5/2016 02:46:15 AM