[W126 Coupe] Power steering moan

[Mike R.]

Two leak paths, generally, from this system. The likely one is a pinhole in
the high pressure hose to the steering gearbox. The other leak is the big
(~2") o-ring for the backing plate on the pump. The first leak is pretty
quick (<1day) and the backing plate is a couple of weeks. See what you have.

 
When I got to Vegas, before my tools showed up, I found that high pressure
hose leak on my SEC. A local repair shop needed a day to obtain the hose. I
took a Coke can and cut a slice of aluminum, which I wrapped around the HP
hose over the pinhole, then put on two hose clamps next to each other over
the leak. Looked real funny and is indeed the butt of several redneck jokes,
but it stopped the leak and I could drive the car until the new hose showed
up. Wish I had a picture of it!!
 
MIke R.
 
From: mbcoupes-bounces at mbcoupes.com [mailto:mbcoupes-bounces at mbcoupes.com]
On Behalf Of shinzbox at aol.com
Sent: Monday, September 14, 2009 3:48 PM
To: mbcoupes at mbcoupes.com
Subject: Re: [W126 Coupe] Power steering moan
 
When I topped the oil off, the "moaning and groaning" went away
substantially but I could still detect it.
So I'm going to change the filter and see if it goes away completely.
Thanks Elm
 
Shin
 
 
-----Original Message-----
From: Elm Zobens <elm at ameritech.net>
To: Mercedes Coupes Mailing Lists <mbcoupes at mbcoupes.com>
Sent: Mon, Sep 14, 2009 2:10 pm
Subject: Re: [W126 Coupe] Power steering moan

Did the noise go away when you filled up the resivoir?
I just had the same issue on my 86' and found a very slight leak in the
crimp of my high pressure PS hose. When enough fluid leaked out (over a
period of many months) my PS started moaning. 

--- On Mon, 9/14/09, shinzbox at aol.com <shinzbox at aol.com> wrote:

From: shinzbox at aol.com <shinzbox at aol.com>
Subject: Re: [W126 Coupe] Power steering moan
To: mbcoupes at mbcoupes.com
Date: Monday, September 14, 2009, 2:38 PM
Thanks Markus,
I'm going to try it.
 
Shin
 
 
-----Original Message-----
From: Markus Meyer <mfm at meyerprobateproperties.com>
To: Mercedes Coupes Mailing Lists <mbcoupes at mbcoupes.com>
Sent: Mon, Sep 14, 2009 11:29 am
Subject: Re: [W126 Coupe] Power steering moan
Shin,
 
At bottom of the reservoir is the round filter.  I had the groan too, but
not low in fluid.  I flushed it, replaced the filter, used MB fluid when
replacing and the groan pretty much went away.  I noticed it most on cold
mornings, not during warmer weather.
 
To take out the filter and replace, you remove the nut at the top of the pin
after taking off the cap, just be careful not to loose the spring that is
under there, it will try and shoot out at you.
 
Markus
-------- Original Message --------
Subject: [W126 Coupe] Power steering moan
From: shinzbox at aol.com
<http://us.mc816.mail.yahoo.com/mc/compose?to=shinzbox@aol.com> 
Date: Mon, September 14, 2009 2:13 pm
To: mbcoupes at mbcoupes.com
<http://us.mc816.mail.yahoo.com/mc/compose?to=mbcoupes@mbcoupes.com> 
Hello everyone.
Recently on my '91 560SEC, the power steering "moans" when I turn it.
I looked at the reservoir and the oil was low so I topped it off.
I pressed on the belt and the belt deflects about 1/2".
I also heard that there is a filter that could be clogged.
Where is this located? Inside the reservoir?
Thanks, you guys are the best
 
Shin Takei
Professional Car Nut 

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