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PS problem 700

posted by  Cheapskate on  Thu Apr 19 09:57 CST 2012
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last visit: Thu Jun 3 23:08 CST 2010
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My 740 just started a steering problem. Symptoms - pulsating at the steering wheel when I turn it, either way, plus a moaning sound. Found it low on fluid, sucking air. Filled up with fluid, sound stopped, but the pulsating is there. The pulsating is also happening on a straight course, at certain road speed.
Can I assume a new PS pump will fix it, and is the A1 Cardone pump a good one?







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    May just need more bleeding to get air bubbles out. 700

    uid 18083's pic
    posted by  lucid on  Thu Apr 19 10:48 CST 2012
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    last visit: Fri Oct 24 12:31 CST 2014
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    Try raising front wheels off the ground and, with motor running, cycle the steering wheel back and forth between L and R limits (don't hold at either limit). Since air has been churned into tiny bubbles, it will take time to expel.

    Here's a good write-up, with my post about the need for vacuum as a response.







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      May just need more bleeding to get air bubbles out. 700

      posted by  Cheapskate on  Fri Apr 20 06:42 CST 2012
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      last visit: Thu Jun 3 23:08 CST 2010
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      Pump problem solved - I managed to bleed the air by doing a few hard lock 3 point turns in my driveway. Fluid level went down 1/2" during this process and the vibrations stopped. Now to search for the leak!
      Thanks.








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        May just need more bleeding to get air bubbles out. 700

        uid 18083's pic
        posted by  lucid on  Fri Apr 20 06:49 CST 2012
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        last visit: Fri Oct 24 12:31 CST 2014
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        "Now to search for the leak!"

        • It may not be a leak. The lower fluid level is probably due to the volume of expelled (bled out) air bubbles that were in the fluid.


        --
        Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.








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          May just need more bleeding to get air bubbles out. 700

          posted by  Cheapskate on  Fri Apr 20 07:58 CST 2012
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          last visit: Thu Jun 3 23:08 CST 2010
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          Hope you are right, but something caused the low level in the first place, allowing the air to get in. Short drive this am, and no detectable loss.








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            May just need more bleeding to get air bubbles out. 700

            posted by  oldyellr on  Fri Apr 20 08:21 CST 2012
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            last visit: Fri Oct 24 14:28 CST 2014
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            If you don't see any leaks in the obvious places, it's likely pinhole(s) in the steel lines on the rack itself. They'll rust out over the years. I went through this a few years ago. First I had to top up the reservoir every tine the steering got noisy, then I started adding Lucas PS Leak Sealer to thicken the fluid and slow down the leakage. I eventually replaced the rack with one I got from a junkyard, but I painted the rusty lines with POR-15 before putting it in. The used rack was $100, but I've seen rebuilt ones on line for ~$130 exchange if the shipping doesn't kill you.
            --
            1992 745 approaching 500k km







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