Groaning Steering Pump
Thread Starter
MBWorld Fanatic!
Joined: Oct 2007
Posts: 1,717
Likes: 17
From: San Jose, CA
2007 E63 w/P30 and Eurotech CF Diffuser
Groaning Steering Pump
Hello everyone. My steering pump has started groaning and getting worse.
First, is the pump the same as those on E55? If so, that gives me a bit more data because there are more results in the search which apply to that engine than the M156.
I did make sure it was full tonight and hot it was reading at the bottom of the cold range so filled it up. I am not however holding out hope that will resolve it.
From my research there are 3 possibilities. The first I am not sure applies, but I have read some high pressure hoses have a check valve that can get clogged. I do not see anything about that on E55/63 so I am assuming it has never been an issue or we do not have one. Another item it could be is a supposed filter integrated into the reservoir. I have no data that says my pump has this but it likely does. And third, the pump is simply going out and I should simply replace the whole thing.
I am hoping some of my E63 brethren have some experience on what they replaced when the PS pump got noisy. Still steers fine, but the groan is enough to be felt through the steering wheel.
Thanks,
Jon
P.S. Pump Reservoir PN in car is 000-466-90-02 which seems to have been replaced by 000-466-95-02
First, is the pump the same as those on E55? If so, that gives me a bit more data because there are more results in the search which apply to that engine than the M156.
I did make sure it was full tonight and hot it was reading at the bottom of the cold range so filled it up. I am not however holding out hope that will resolve it.
From my research there are 3 possibilities. The first I am not sure applies, but I have read some high pressure hoses have a check valve that can get clogged. I do not see anything about that on E55/63 so I am assuming it has never been an issue or we do not have one. Another item it could be is a supposed filter integrated into the reservoir. I have no data that says my pump has this but it likely does. And third, the pump is simply going out and I should simply replace the whole thing.
I am hoping some of my E63 brethren have some experience on what they replaced when the PS pump got noisy. Still steers fine, but the groan is enough to be felt through the steering wheel.
Thanks,
Jon
P.S. Pump Reservoir PN in car is 000-466-90-02 which seems to have been replaced by 000-466-95-02
Last edited by Jon2007E63P30; Aug 24, 2017 at 03:43 AM.
Super Member
Joined: Jun 2014
Posts: 609
Likes: 19
From: Ontario
2005 E55
For the cost, I replaced the pump & reservoir at once. No more groan
Only challenging part of the job is accessing some of the bolts
Also have a long magnetic stick ready for when you drop a bolt or fumble the bolts inside the power steering pulley. Also I would recommend you get a pump with pulley already pressed on for ease of install.
Only challenging part of the job is accessing some of the bolts
Also have a long magnetic stick ready for when you drop a bolt or fumble the bolts inside the power steering pulley. Also I would recommend you get a pump with pulley already pressed on for ease of install.
Senior Member
Joined: Apr 2010
Posts: 394
Likes: 155
2013 E63 P30, 2010 GL550
My E63 started to sound like you describe. So I began preparing for the dreaded pump replacement. Lo and behold, it just needed some fluid despite the reservoir probe showed adequate level. I also know people who 'fixed' this by replacing fluid. Do not underestimate steering fluid. Hope this helps.
Thread Starter
MBWorld Fanatic!
Joined: Oct 2007
Posts: 1,717
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From: San Jose, CA
2007 E63 w/P30 and Eurotech CF Diffuser
Thank. Filling with new fluid had it leak out.
Now is worse. PN for reservoir confusing. PN on current shown with replacement number but it is not shown as a fitment for my car. Ordering parts Monday
Now is worse. PN for reservoir confusing. PN on current shown with replacement number but it is not shown as a fitment for my car. Ordering parts Monday
Thread Starter
MBWorld Fanatic!
Joined: Oct 2007
Posts: 1,717
Likes: 17
From: San Jose, CA
2007 E63 w/P30 and Eurotech CF Diffuser
More info after crawling under the car. Somehow what I had thought the steering fluid would be the green of the CHF 11S I had changed in the reservoir. But no, engine oil color. And same in reservoir. Changed it out and put some absorbent pads on the splash shield to get me bye for a week.
Thread Starter
MBWorld Fanatic!
Joined: Oct 2007
Posts: 1,717
Likes: 17
From: San Jose, CA
2007 E63 w/P30 and Eurotech CF Diffuser
First - big shout out to https://www.benzpartshq.com/ who helped me figure this out. They also have the cheapest price for rebuilt steering pumps.
Hotsauce55 - well you are not the first and not the last E55 owner to give advice to a E63 driver that did not apply to E63. Turns out the reservoir and pump are not connected by an O-ring. they are connected by a hose. No worries, the documentation from the parts suppliers matched what you said. My dealer gave me info but 2x the price on the reservoir.
There is an integrated filter. PN is 000-466-95-00 even though the picture looks nothing like that reservoir from the parts suppliers. There is no O-ring. No idea where it is leaking but will disassemble and let you all know.
Hotsauce55 - well you are not the first and not the last E55 owner to give advice to a E63 driver that did not apply to E63. Turns out the reservoir and pump are not connected by an O-ring. they are connected by a hose. No worries, the documentation from the parts suppliers matched what you said. My dealer gave me info but 2x the price on the reservoir.
There is an integrated filter. PN is 000-466-95-00 even though the picture looks nothing like that reservoir from the parts suppliers. There is no O-ring. No idea where it is leaking but will disassemble and let you all know.
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Super Member
Joined: Jun 2014
Posts: 609
Likes: 19
From: Ontario
2005 E55
Hotsauce55 - well you are not the first and not the last E55 owner to give advice to a E63 driver that did not apply to E63. Turns out the reservoir and pump are not connected by an O-ring. they are connected by a hose. No worries, the documentation from the parts suppliers matched what you said. My dealer gave me info but 2x the price on the reservoir.
If the E63 had no PS pump or reservoir then I could understand your comment.
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Thread Starter
MBWorld Fanatic!
Joined: Oct 2007
Posts: 1,717
Likes: 17
From: San Jose, CA
2007 E63 w/P30 and Eurotech CF Diffuser
Hotsauce. My apologies, I read it as having the reservoir pressed on.
I owe you a beer... next time I am in Ontario or you in SanFran bay area
I owe you a beer... next time I am in Ontario or you in SanFran bay area
