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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:

$350

Talent:

*****

Tools:

Set of sockets (10mm 13mm), wrenches (16mm, 17mm), screwdrivers

Applicable Models:

BMW Z3 (1996-02)

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:

Quite power steering pump, remedy power steering leaks.

Complementary Modification:

Change power steering fluid reservoir

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 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 loose 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.

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

Place an oil drain pan under left side of engine.

The first step is to suction the fluid out of the reservoir. You can use a fluid pump or a turkey baster. Once the reservoir is empty, use the steps below that apply to your model.

Models with 4-cylinder engine:

Using a flathead screwdriver, loosen the secondary air pump inlet hose clamp.
Figure 1

Using a flathead screwdriver, loosen the secondary air pump inlet hose clamp. (green arrow)

Then, remove the secondary air inlet hose from the air filter housing by pulling it straight off.
Figure 2

Then, remove the secondary air inlet hose from the air filter housing by pulling it straight off. (green arrow) Then pull it off the air pump and store in a safe place.

Next, you will unclip the three air filter housing retaining clips.
Figure 3

Next, you will unclip the three air filter housing retaining clips. (green arrows). One of the clips was hidden beneath the secondary air inlet hose. You will have to reach in behind air filter housing to access it.

Disconnect the intake air sensor electrical connector by pressing the wire release tab and pulling the connector straight off.
Figure 4

Disconnect the intake air sensor electrical connector by pressing the wire release tab and pulling the connector straight off.

Working at the air flow meter, twist electrical connector counterclockwise to disconnect.
Figure 5

Working at the air flow meter, twist electrical connector counterclockwise to disconnect. (green arrow). Then loosen the air flow meter hose clamp (yellow arrow). Once loose, remove the air filter housing from the engine compartment.

Then, loosen the secondary throttle body hose clamp at the rear air boot (green arrow).
Figure 6

Then, loosen the secondary throttle body hose clamp at the rear air boot (green arrow).

Once loose, pull the intermediate throttle out of the boot.
Figure 7

Once loose, pull the intermediate throttle out of the boot. You can leave the cables connected, just lay it aside.

Next, you have to disconnect the secondary air pipe from the pump.
Figure 8

Next, you have to disconnect the secondary air pipe from the pump. Squeeze the release tabs, then pull the pipe straight off the secondary air valve to remove.

Now, it is time to unbolt the secondary air pump.
Figure 9

Now, it is time to unbolt the secondary air pump. You will have to lift it up to disconnect the electrical at the bottom. Start by removing the two 13mm nuts (green arrows) that secure the pump to the support bracket.

Then working at the back side of the pump bracket, remove the wiring harness from the mounting clip.
Figure 10

Then working at the back side of the pump bracket, remove the wiring harness from the mounting clip. (green arrow)

Lift the pump up and off the bracket.
Figure 11

Lift the pump up and off the bracket. You will have to push the pump toward the firewall to clear the plastic clip on the rear of the bracket. Then, remove the purge valve from the pump by pulling it straight up and off the mounting bracket. (green arrow) The purge valve is housed in a rubber mount, if it is stuck, lubricate it with dish soap to help get it off.

Lift the secondary air pump off the mounting bracket and disconnect electrical connector by squeezing tabs and pulling it straight off.
Figure 12

Lift the secondary air pump off the mounting bracket and disconnect electrical connector by squeezing tabs and pulling it straight off.

Next, you have to loosen two 10mm nuts from the lower air filter housing (green arrows).
Figure 13

Next, you have to loosen two 10mm nuts from the lower air filter housing (green arrows). Loosen them about 10 turns. This will be enough to get it out. Note orientation of hoses for reinstallation.

With the lower air filter housing unbolted, lift it up, fastener side first, feeding the intake tube (green arrow) out of the shroud at radiator.
Figure 14

With the lower air filter housing unbolted, lift it up, fastener side first, feeding the intake tube (green arrow) out of the shroud at radiator.

Working at the power steering reservoir, remove the two 10mm fasteners (green arrows).
Figure 15

Working at the power steering reservoir, remove the two 10mm fasteners (green arrows). Be sure not to lose the washers when removing. Lift the power steering pump off its mounting bracket and place it aside.

Before removing the drive bolt, loosen the three 13mm power steering pulley bolts.
Figure 16

Before removing the drive bolt, loosen the three 13mm power steering pulley bolts. (green arrows) Just loosen them, do not remove yet. Remove engine drive belt from alternator and power steering pulley and lay aside. See our tech article on engine drive belt replacing. Remove alternator. See our tech article on removing your alternator. Now hereÂ's a tip. You donÂ't have to remove the alternator, but it does make getting to the pressure line on the top of the pump easier, and also makes removing it easier. With the alternator out of the way, you can remove the pump from the top and this is much better than laying on your back with fluid dripping all over.

Now, you can remove the pulley from the power steering pump.
Figure 17

Now, you can remove the pulley from the power steering pump. If pulley is stuck, work it side to side, do not use excessive force.

Next, loosen or cut the hose clamp for the inlet hose to the power steering pump (green arrow).
Figure 18

Next, loosen or cut the hose clamp for the inlet hose to the power steering pump (green arrow). Then, remove the hose from the pump. Have a drain pan under the pump, excess fluid will leak out.

Loosen the pressure line using a 17mm crows foot wrench (green arrow).
Figure 19

Loosen the pressure line using a 17mm crows foot wrench (green arrow). Do not remove it yet. Leaving it installed until the last minute will prevent dirt from entering the pump.

Now, you can remove the two 13mm power steering mounting fasteners.
Figure 20

Now, you can remove the two 13mm power steering mounting fasteners. (green arrows) Once removed, unscrew the pressure line and remove the pump from the engine. The high pressure steering line is sealed with an O-ring. Be careful not to lose the O-ring when removing line. It can get stuck in pump and fall out when pump is removed. Once line is removed, inspect O-ring and replace if necessary, (O-ring is available separately from Pelican Parts).

Once pump is removed, transfer the front power steering pump mounting bracket from old pump to new.
Figure 21

Once pump is removed, transfer the front power steering pump mounting bracket from old pump to new. Remove three 13mm fasteners (green arrows) and install bracket on new pump.

Once pump is removed, transfer the rear power steering pump mounting bracket from old pump to new.
Figure 22

Once pump is removed, transfer the rear power steering pump mounting bracket from old pump to new. Remove three 13mm fasteners (green arrows) and install bracket on new pump. Lower new power steering pump into engine compartment. Install power steering pump fasteners and tighten. Then hoses and reassemble remaining items in reverse order of removal. Once complete, fill and bleed power steering system as noted below.

Models with 6-cylinder engine:
Remove the air filter housing assembly.
Figure 23

Remove the air filter housing assembly. Remove the 10mm fastener (green arrow), then disconnect air flow meter electrical connector (yellow arrow). Now loosen the air flow meter clamp (red arrow) and lift the air filter housing out of the engine compartment. Remove alternator. See our tech article on removing your alternator. Place an oil drain pan under the left front corner of your vehicle.

Working under your vehicle at the front corner: Using a 17 mm wrench, remove PS pump high pressure line.
Figure 24

Working under your vehicle at the front corner: Using a 17 mm wrench, remove PS pump high pressure line. (green arrow) The high pressure steering line is sealed with an O-ring. Be careful not to lose the O-ring when removing line. It can get stuck in pump and fall out when pump is removed. Once line is removed, inspect O-ring and replace if necessary, (O-ring is available separately from Pelican Parts).

Next, using a pair of diagonal cutters, cut power steering return hose clamp.
Figure 25

Next, using a pair of diagonal cutters, cut power steering return hose clamp. Then remove return hose from pump. (green arrow) Remove hose slowly, have oil pan ready to catch PS fluid.

Remove three power steering pump 13mm fasteners.
Figure 26

Remove three power steering pump 13mm fasteners. (green arrows) Fasteners are different lengths, mark locations for help when reinstalling. With fasteners removed, push power steering pump down and away from oil filter housing bracket. Once power steering pump is separated from oil filter housing, remove from engine compartment.

Place power steering pump on work bench.
Figure 27

Place power steering pump on work bench. Remove pulley mounting fasteners (green arrows), then transfer pulley over to new power steering pump. Pump pulley is made of plastic, be careful when removing. If pulley is stuck, work it side to side, do not use excessive force.

Once pulley is removed, transfer power steering pump mounting bracket from old pump to new.
Figure 28

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

Bleeding power steering pump: All engines
Before starting engine, fill power steering reservoir with clean fluid to MAX level on dipstick.
Figure 29

Before starting engine, fill power steering reservoir with clean fluid to MAX level on dipstick. (green arrow) Start engine and turn steering wheel fully left and right 3 times. Turn engine off, check fluid level, add fluid until it reaches MAX on dipstick. When full, fluid should be clear and foam free. Foam or bubbles is a sign of air in the system.

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Page last updated: Sat 12/3/2016 02:07:18 AM