Parts Catalog Accessories Catalog Tech Info Tech Forums
 
Follow Pelican Parts on Facebook Follow Pelican Parts on Twitter Follow Pelican Parts on Instagram Follow Pelican Parts on YouTube Follow Pelican Parts on Pinterest Follow Pelican Parts on Tumblr
  Search our site:    
View Recent Cars  |   Cart  | Project List | Order Status | Help    
 >  >
Power Steering Pump Replacement
 
Bookmark and Share

Pelican Technical Article:

Power Steering Pump Replacement

Nick Czerula

Time:

4 hours4 hrs

Tab:

$300

Talent:

*****

Tools:

Set of sockets (10mm, 13mm), wrenches 22, 27mm, screwdrivers

Applicable Models:

BMW E46 M3 Coupe/Conv (2006)
BMW Z4 Coupe/Conv (2006-08)

Parts Required:

Power steering pump, power steering fluid, power steering hose clamp

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 Z4 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, which steer the front wheels. A hydraulic pump, powered by the engine accessory belt, forces steering fluid into the 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.

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 a problem, replace the power steering fluid reservoir. I have seen noisy pumps remedied by replacing the power steering reservoir. If yours is groaning, try replacing the reservoir first. You can also use this article if you need to replace the hose clamps on the power steering reservoir hoses, as they have a tendency to leak over time. There are two hoses off the reservoir that I usually replace. One hose goes to the cooler. The other hose goes to the pump.

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

Remove the intake air housing and ducts. See our tech article on intake air housing ducts replacing.

Remove the alternator. See our tech article on alternator removing.

When a power steering pump (red arrow) begins to fail, it will emit a groan when steering from side to side or you will notice increased steering effort.
Figure 1

When a power steering pump (red arrow) 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 a problem, replace the power steering fluid reservoir. I have seen noisy pumps remedied by replacing the power steering reservoir (red arrow). If yours is groaning, try replacing the reservoir first. You can also use this article if you need to replace the hose clamps on the power steering reservoir hoses, as they have a tendency to leak over time. There are two hoses off the reservoir that I usually replace. One hoses goes to the cooler. The other hose goes to the pump.

Be sure to use the correct fluid for your vehicle.
Figure 2

Be sure to use the correct fluid for your vehicle. The wrong fluid can cause power steering noise or premature wear. Our Z4 subject vehicle takes ATF (red arrow).

Bleeding power steering pump: Before starting the engine, fill the power steering reservoir with clean fluid to the MAX level (red arrows) on the dipstick.
Figure 3

Bleeding power steering pump: Before starting the engine, fill the power steering reservoir with clean fluid to the MAX level (red arrows) 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. Add fluid until it reaches MAX (red arrows) on the dipstick. When full, the fluid should be clear and foam free. Foam or bubbles is a sign of air in the system. If you are checking your fluid with a cold engine, it may be near the LOW mark (green arrows). If you find this, warm the vehicle and recheck it before topping up.

Use a suction pump (red arrow) to suck the power steering fluid out of the reservoir.
Figure 4

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

Working at the power steering pump, loosen the three 13mm pulley fasteners (red arrow).
Figure 5

Working at the power steering pump, loosen the three 13mm pulley fasteners (red arrow). Remove the engine drive belt from the alternator pulley and lay it aside. See our tech article on engine drive belt replacing.

Place an oil drain pan under the left side of the engine.
Figure 6

Place an oil drain pan under the left side of the engine.

Now it's time to remove the low-pressure hose from the power steering pump.
Figure 7

Now it's time to remove the low-pressure hose from the power steering pump. The clamps have a crimp and the hook (red arrow). The clamps are removed via the hook end.

Use a small flathead screwdriver (red arrow) and lever open the hose clamp (green arrow).
Figure 8

Use a small flathead screwdriver (red arrow) and lever open the hose clamp (green arrow). Once you get the hose clamp open, push the clamps away from the pump.

Working under your vehicle at the front corner, use a 22mm wrench to remove the PS pump high-pressure line (red arrow).
Figure 9

Working under your vehicle at the front corner, use a 22mm wrench to remove the PS pump high-pressure line (red arrow). The high-pressure steering line is sealed with metal sealing washers. Always replace with new ones when removing the old ones. If the 22mm Banjo bolt will not come out, the 27mm threaded insert (green arrow) will have to be counter held as you loosen the banjo bolt (red arrow).

If the 22mm Banjo bolt will not come out, the 27mm threaded insert (green arrow) will have to be counter held as you loosen the banjo bolt (red arrow).
Figure 10

If the 22mm Banjo bolt will not come out, the 27mm threaded insert (green arrow) will have to be counter held as you loosen the banjo bolt (red arrow). This photo shows the two wrenches in place, loosening the Banjo bolt.

Remove the power steering pump pulley (red arrow) from the power steering pump (green arrow).
Figure 11

Remove the power steering pump pulley (red arrow) from the power steering pump (green arrow). 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.

The pump pulley is made of plastic.
Figure 12

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. The green arrow points to damage to a pulley from having to be pried off. This happens when corrosion is formed between the pulley and the pump flange. Replace you pulley if this occurs.

This photo shows the rear of the power steering pump with the alternator removed.
Figure 13

This photo shows the rear of the power steering pump with the alternator removed. The green arrows point to the rear power steering pump fastener. Start by removing the 10mm oil cooler line bracket fastener (red arrows). Then remove the 13mm power steering pump support bracket fastener (green arrow).

Next remove the two front 13mm fasteners (red arrows).
Figure 14

Next remove the two front 13mm fasteners (red arrows). Support the pump as you remove the final fastener.

This photo shows the pump being removed from the top of the engine.
Figure 15

This photo shows the pump being removed from the top of the engine.

This photo shows the pump being removed from the bottom of the engine.
Figure 16

This photo shows the pump being removed from the bottom of the engine. Reverse the steps to install the new pump. 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 earlier.

Bookmark and Share

  Search our site:    

View Cart & CheckOut | Project List | Order Status |  Help    

 

[Home] [Customer Service] [Shopping Cart] [Privacy Statement]
 [Contact Us] [About Us] [Shipping] [Map to our Location] [Careers]

Copyright © Pelican Parts Inc.

Page last updated: Mon 12/5/2016 02:56:57 AM