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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Fri, Apr-20-2018, 05:55:57 PM   #1
Polaris15
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Default Did I Roast My Power Steering Pump?

was driving my M3 to work yesterday, 2nd time out since I put her away for the winter. Power steering pump started to labor, making moaning, groaning, whining noises. Steering was getting heavier and heavier. Got to work, popped the hood and found the power steering fluid reservoir was bone dry. I limped to the auto parts store and filled up the reservoir because I had an appointment that was not an option to miss. After filling the power steering worked flawlessly and I was off. Of course, all the fluid proceeded leak out at a rapid rate. I was on the highway when this happened and i proceeded to finish my 2 hour round trip with no power steering. Pump isn't making any noises anymore and I've got obvious work to do.

So now I am going to change every power steering hose, banjo bolts, put in a new reservoir and buy a new pump?

Since the pump stopped making news I've come to the assumption its toast. Is this typically the case? Can I buy the rebuild kit rebuild it or do I need to buy a new pump?

Anything else I should do while I'm in there?
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Old Sat, Apr-21-2018, 02:07:20 AM   #2
bluptgm3
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Default Did I Roast My Power Steering Pump?

Quote:
Originally Posted by Polaris15 View Post
was driving my M3 to work yesterday, 2nd time out since I put her away for the winter. Power steering pump started to labor, making moaning, groaning, whining noises. Steering was getting heavier and heavier. Got to work, popped the hood and found the power steering fluid reservoir was bone dry. I limped to the auto parts store and filled up the reservoir because I had an appointment that was not an option to miss. After filling the power steering worked flawlessly and I was off. Of course, all the fluid proceeded leak out at a rapid rate. I was on the highway when this happened and i proceeded to finish my 2 hour round trip with no power steering. Pump isn't making any noises anymore and I've got obvious work to do.



So now I am going to change every power steering hose, banjo bolts, put in a new reservoir and buy a new pump?



Since the pump stopped making news I've come to the assumption its toast. Is this typically the case? Can I buy the rebuild kit rebuild it or do I need to buy a new pump?



Anything else I should do while I'm in there?


You can buy a rebuild kit for ZF M3 pump, p/n 32411135880.
Your pump however, is beyond a rebuild but you wonít really know until you take it apart. The pump shaft runs in the housing, no bearing. The shaft is bathed in fluid and the housing is aluminum so no bearing required.
New pumps p/n 32412227197 appear to be NLA, I believe you can buy a rebuilt pump.


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Last edited by bluptgm3; Sat, Apr-21-2018 at 04:20:36 AM.
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Old Mon, Apr-23-2018, 04:26:37 PM   #3
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Default Re: Did I Roast My Power Steering Pump?

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Originally Posted by bluptgm3 View Post
You can buy a rebuild kit for ZF M3 pump, p/n 32411135880.
Your pump however, is beyond a rebuild but you wonít really know until you take it apart. The pump shaft runs in the housing, no bearing. The shaft is bathed in fluid and the housing is aluminum so no bearing required.
New pumps p/n 32412227197 appear to be NLA, I believe you can buy a rebuilt pump.


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Has anyone ever rebuilt one? I can get a pump from a friend for free but I'd want to rebuild it before I Install it. How long for a fairly experienced DIYer to get it done?
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Old Mon, Apr-23-2018, 04:38:04 PM   #4
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Default Did I Roast My Power Steering Pump?

Iíve done one with two others on the shelf awaiting the seal kits, there are no bearings to replace. As stated previously, the pump shaft rides in the aluminum housing bathed in ATF behind the forward pressure seal.

Be sure that it is the M3 ZF pump. The E36 323/328 are fit with a non interchangeable LUK pump.

Figure an hour or two for cleaning and an hour for disassembly/reassembly. Pay close attention to the orientation of the pump vanes.


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Last edited by bluptgm3; Mon, Apr-23-2018 at 08:22:47 PM.
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Old Mon, Apr-23-2018, 05:00:58 PM   #5
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Default Re: Did I Roast My Power Steering Pump?

I had some road debris fly into my engine bay, take out my radiator fan, and somehow only damaged one of my power steering lines. Luckily the cooling lines were fine. This was before I put an underpanel in...

I had to limp home, about a 1 hour drive with no power steering fluid. My pump did the same thing, complained, then got quiet. I replaced the hoses, topped it off with fluid, and my pump was fine.

Perhaps try your pump out, before taking the big step of replacing/rebuilding it?
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Old Mon, Apr-23-2018, 06:22:17 PM   #6
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Default Re: Did I Roast My Power Steering Pump?

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Originally Posted by Polaris15 View Post
Has anyone ever rebuilt one? I can get a pump from a friend for free but I'd want to rebuild it before I Install it. How long for a fairly experienced DIYer to get it done?
Nope, no one ever.

http://www.m3forum.net/m3forum/showp...0&postcount=10
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Old Tue, Apr-24-2018, 04:07:51 PM   #7
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Default Re: Did I Roast My Power Steering Pump?

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You are the MAN.
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Old Tue, Apr-24-2018, 04:09:04 PM   #8
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Default Re: Did I Roast My Power Steering Pump?

Quote:
Originally Posted by Earthwormjlm View Post
I had some road debris fly into my engine bay, take out my radiator fan, and somehow only damaged one of my power steering lines. Luckily the cooling lines were fine. This was before I put an underpanel in...

I had to limp home, about a 1 hour drive with no power steering fluid. My pump did the same thing, complained, then got quiet. I replaced the hoses, topped it off with fluid, and my pump was fine.

Perhaps try your pump out, before taking the big step of replacing/rebuilding it?
I think I may go this route and see whats what. Thanks!
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Old Tue, Apr-24-2018, 06:07:12 PM   #9
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Default Re: Did I Roast My Power Steering Pump?

Honestly, chances are your pump is fine. I would change the hose, reservoir, fill with fluid and see if the pump needs to be replaced then.
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Old Tue, Apr-24-2018, 06:24:57 PM   #10
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Default Re: Did I Roast My Power Steering Pump?

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Nope, no one ever.





Nice collection of photos!!!

How did you handle installation of the steel retaining clip?
I ended up reusing the aluminum clip that was on the shaft when I disassembled the pump.


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Discussing Did I Roast My Power Steering Pump? in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)