Stuck Power Steering High Pressure Line - Mercedes-Benz Forum
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#1 (permalink) Old 07-06-2011, 11:51 AM
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Stuck Power Steering High Pressure Line

I have read through all the posts on how to change the power steering pump in my 2001 ml320. Seems simple enough, other than the high pressure line going into the side of the pump will not budge. I put a 17mm box wrench over it and it didn't move.....just rounded the edges a bit. Any ideas on how to get that line off? I'd like to save that pressure line if I can.....
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#2 (permalink) Old 07-06-2011, 11:58 AM
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You should use a Flare Nut Wrench.
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#3 (permalink) Old 07-06-2011, 12:01 PM
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sorry - right, used exactly that on it. (box end wouldn't fit over the hose) sorry.
I contemplated but clamping onto it but I don't want to pinch the line and i need to put it on the new pump
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#4 (permalink) Old 07-06-2011, 12:09 PM
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Originally Posted by jrmbkm View Post
sorry - right, used exactly that on it. (box end wouldn't fit over the hose) sorry.
I contemplated but clamping onto it but I don't want to pinch the line and i need to put it on the new pump
Aren't you talking about this fitting? If so the flare nut wrench will work if it is the correct size.
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#5 (permalink) Old 07-06-2011, 01:23 PM
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That is exactly it. I used the 17mm flare nut wrench. It seemed to be the correct size - it fit snug but it didn't break it loose...... I didn't do much after the wrench started to round the edges - I put everything back together so we could drive it while I tried to get a plan together. It isn't horribly deformed and I think i can still get the 17mm back on it to try it again but I put a lot of pressure on it the first time. I also spayed it and let it sit for 10 min with wd40 to see if it would help before i tried it.... thoughts?
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#6 (permalink) Old 07-06-2011, 03:51 PM
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Why are you replacing the P/S pump? Is it because of a whining noise?
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#7 (permalink) Old 07-06-2011, 07:56 PM
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The pump is shot....it ran dry from a leak in the reservior seal and I never caught it. I normally don't drive it but I hopped in the car a few months ago and noticed the steering was terrible. I tried a new seal and bled the system per the posts on the forum but no luck, still feels bad. I have a rebuilt lux pump, just need to get that pressure line off clean.
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#8 (permalink) Old 07-06-2011, 09:07 PM
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Get the craftsman new wrenches which bite on the center of the flats not the corners and youll get it. Best 20 bucks I ever spent on those wreches. They never round off anything.
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#9 (permalink) Old 07-11-2011, 08:54 AM
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I stopped in a sears to buy a set of the wrenches, and was told that they don't make them anymore. Apparently they stopped stocking them 2 years ago.....
So, I went to plan b and just clamped onto the nut risking the pressure line, but it did crack free and the line is good. The new pump is on and the steering is fantastic - so nice to get it done! Thanks for the help.
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#10 (permalink) Old 08-03-2011, 05:16 PM
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43sqd, mine making a whining noise,I see you asked the question & wondering what it means.
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