Power steering advice from my fellow experts - Mercedes-Benz Forum
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#1 (permalink) Old 06-26-2013, 01:52 PM
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Power steering advice from my fellow experts

Power steering fluid required two top offs within a week. I discovered a hydraulic hose had failed. Car was driven for a short distance twice with the fluid quite low. After hose replacement steering groans.

My indie said he did bleed the system. When car is warm on a really hot day the groan almost can't be heard. I bled the system myself a few days ago - lock to lock off the ground 30 times. Slightly improved noise reduction. The system still groans, especially when reaching lock.

Lubrizol has never been added to the system. Other than this any thoughts?

I also had a thought - the newer synthetic fluid was added by my indie and I have no idea what was in there prior. Could co mingling of non and synthetic have an effect?

Otherwise my usually wonderful silent car now sounds like an old ford p/u
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#2 (permalink) Old 06-26-2013, 02:17 PM
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as far as i know you are not supposed to mix the older regular psf with the newer synthetic psf, but completely flush the old one out before adding the new one. if there was no noise before with the regular psf but it appeared after adding the synthetic one, then just get out all the fluid and replace with regular psf. dealer charges around $7 per bottle of regular psf, 2 should be more than enough. good luck
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#3 (permalink) Old 06-26-2013, 05:03 PM
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funny thing that is the synthetic fluid is what the tec at the dealership told me to use in the car. I asked specific to year and model.
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#4 (permalink) Old 06-26-2013, 05:07 PM
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The correct fluid for our cars is non-synthetic MB PS fluid, Part No. Q 1 46 0001. I paid $9.42 for 1 quart at dealer. I would by the correct fluid and do and fluid change as per the stickies. Also, I had a power steering noise when the engine is at operating temperature. I changed the fluid and added 50ml of Lubrizol, Part No. 001-989-61-03. Make sure you suck out the same amount of PS fluid before you add it.
The noise was gone within a week of adding lubrizol.
Good luck!
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#5 (permalink) Old 06-27-2013, 12:46 AM
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besides a hose fail, the very common problem for W210 is the steering gear. YOU HAVE TO RETIGHTEN IT EVERY 60,000 MILES. If you don't re tighten the steering gear, steering fluid will leak from the gear.

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#6 (permalink) Old 06-27-2013, 01:50 AM
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and where do you do that? and how do you test? Do you have more information on this?
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#7 (permalink) Old 06-27-2013, 08:14 AM
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try replacing the reservoir , has a filter in it , when dirty , sterring will make noise .
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#8 (permalink) Old 06-27-2013, 04:40 PM
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Quote:
Originally Posted by KarlBenzSF View Post
besides a hose fail, the very common problem for W210 is the steering gear. YOU HAVE TO RETIGHTEN IT EVERY 60,000 MILES. If you don't re tighten the steering gear, steering fluid will leak from the gear.
bump on that question, what "gear tightening" are you refering to?

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#9 (permalink) Old 06-28-2013, 12:43 AM
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OK.... I used to have a picture when the steering gear is leaking. I cannot find it now. Does anyone has a picture of frontal section of the underside of the car? If a picture is available, I can circle it out which gear you guys need to tighten it.

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#10 (permalink) Old 06-28-2013, 05:26 AM
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would this help?
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The ultimate ignorance is the rejection of something you know nothing about and refuse to investigate.
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