[W126 Coupe] Power Steering Noise

[Dick Spellman]

Hi Robert,

Jonathan gave me a few tricks sometime back for two Mercedes with 
groaning ps pumps.

   1. Drain the sump (suction) and remove filter.
   2. Buy locally 3 liters of this green hydraulic fluid (Jonathan knows
      the brand)
   3. Remove the return line on the ps pump
   4. Fill the sump to the top and carefully _cold crank_ the motor
      stopping before the sump is sucking air
   5. Add more green stuff to sump
   6. Rotate wheel left then right a couple times then
   7. Repeat this process (about the end of the 2nd liter) until you get
      nice green fluid on the return line.
   8. Button up the return line, check for leaks.
   9. Install new filter
  10. Start the motor and top off the sump (any cavitation should stop
      in a few hours)

Result - no more groan.

Please check with Jonathan on the above steps as I did this from memory.

Failing this fix replace the pump with a genuine MB rebuilt from Jonathan.

The above worked on one MB and required a pump on the other.  In both 
cases things have been nice and quiet for a year or two as I did both 
pumps at about the same time.

Regards,
Dick

Robert Karl Stonjek wrote:

> Hi Markus,

> my steering box has been reconditioned and is nice and tight (no 

> play).  I suppose I'll have to take it back to the guy who did the 

> work and see if he knows any more.

>  

> Robert

>

> My car used to do that.  Flushing did nothing to help, using MB fluid 

> did nothing to help.  Finally after a new steering box was put in, the 

> noises stopped.  Guess the box was getting old and groaning...

>  

> Markus Meyer

> mfm at meyerprobateproperties.com <mailto:mfm at meyerprobateproperties.com>

> www.meyerprobateproperties.com <http://www.meyerprobateproperties.com>

> Meyer Probate & Properties, LLC

> 484-919-9762

>  

>

>  

>

>     -------- Original Message --------

>     Subject: [W126 Coupe] Power Steering Noise

>     From: "Robert Karl Stonjek" <rstonjek at bigpond.net.au>

>     Date: Wed, February 25, 2009 7:42 pm

>     To: "MB Coupes" <mbcoupes at mbcoupes.com>

>

>     Hi,

>     whenever I turn the wheel to left or right when driving there is a

>     kind of hum coming from the power steering.  Only seems to occur

>     when the car is cold and goes away after a while.

>      

>     Is it air in the system or what?  Any ideas?

>      

>     The sound is like a fog horn at a distant.

>      

>     Robert

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