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Squeaky steering when approaching lock

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    #1

    Squeaky steering when approaching lock

    Stag noob here. In fact new to classic car ownership... Loving it though!

    Anyway... I'm getting a lot of high pitched squeaking when turning the power steering on my 1977 MkII Stag towards full lock on either side. It doesn't seem to make a difference how long the car's been running. I've checked and topped up the power steering fluid (Comma PSF).

    I appreciate that accurately diagnosing squeaks via an internet forum isn't exactly scientific but as I'm new to this game was wondering if the collective wisdom here might have some thoughts and things I can try...

    Thanks for listening!
    Tags: squeaking, steering
    #2
    Loose PAS belt, and/or catching on something such as fan blades?

    Comment

      #3
      Hi, and welcome to the wonderful world of Stag ownership.

      The power steering used on Stags was a basic hydraulic system. The pump was used on very many British and American cars of the period and is driven off the crankshaft pulley.

      Whilst you say 'squeaking', this could do with clarifying. At full lock, many power steering systems emit a 'hissing' sound as the pump continues to try and pump fluid against a stationary rack. This is normal. However, if the belt is worn, or loose, it could be slipping. This could sound somewhere between a squeak and a screech.

      I would start with checking the belt tension and replace the belt if it looks worn. It may even be the wrong profile belt. Any of the reputable suppliers should have the correct belt, or even your local motor factors.
      Last edited by DJT; 26 November 2016, 20:53. Reason: spelling
      Dave
      1974 Mk2, ZF Auto, 3.45 Diff, Datsun Driveshafts. Stag owner/maintainer since 1989.

      Comment

        #4
        Originally posted by DJT View Post
        .....At full lock, many power steering systems emit a 'hissing' sound as the pump continues to try and pump fluid against a stationery rack....
        with "stationary" I hope you mean a rack which is approaching (or at) its limit of travel? Relieved if so, 'cos I just noticed that last weekend on my Stag and didn't post because I can't take bad news before Christmas!

        Drew
        The answer isn't 42, it's 1/137

        Comment

          #5
          Originally posted by dasadrew View Post
          with "stationary" I hope you mean a rack which is approaching (or at) its limit of travel? Relieved if so, 'cos I just noticed that last weekend on my Stag and didn't post because I can't take bad news before Christmas!

          Drew
          Yes, Drew.

          Thanks for pointing out my spelling mistake. I've just edited it. Fancy writing 'stationery' (envelopes, etc.) instead of 'stationary' (at rest).....
          Dave
          1974 Mk2, ZF Auto, 3.45 Diff, Datsun Driveshafts. Stag owner/maintainer since 1989.

          Comment

            #6
            Mine does this sometimes
            I have to back into the garage on full lock and at this point I can get a squeal - a bit like the sound of a slipping fan belt
            All good advice above but when checking/adjusting the tension please note that the 3 bolts holding the pump assembly in position screw into an aluminium casting which will have deteriorated over time, these threads can easily strip
            John

            Comment

              #7
              Originally posted by DJT View Post
              Yes, Drew.

              Thanks for pointing out my spelling mistake. I've just edited it. Fancy writing 'stationery' (envelopes, etc.) instead of 'stationary' (at rest).....
              to be honest i didn't see that Dave! The quotation emphasis was meant to mean that "stationary" could also be in an unloaded straight-ahead position, so I hoped you meant on full-lock.

              Drew
              The answer isn't 42, it's 1/137

              Comment

                #8
                Originally posted by Mister G View Post
                Mine does this sometimes
                I have to back into the garage on full lock and at this point I can get a squeal - a bit like the sound of a slipping fan belt
                All good advice above but when checking/adjusting the tension please note that the 3 bolts holding the pump assembly in position screw into an aluminium casting which will have deteriorated over time, these threads can easily strip
                John
                ...And all 3 did so on mine not all that long ago, so I replaced the bolts with helicoils & "studs" and now hold the PAS bracket in place with nuts instead of bolts.

                Comment

                  #9
                  Originally posted by Tdm View Post
                  ...And all 3 did so on mine not all that long ago, so I replaced the bolts with helicoils & "studs" and now hold the PAS bracket in place with nuts instead of bolts.
                  That is a good idea, much better than original, I'll give it a go

                  Comment

                    #10
                    Thanks everyone for the advice, the warm welcome to Stag ownership.... and a bit of banter re "stationary" :-D

                    The weather is great today so I'll get the car out and have a look. Sadly they gritted the local roads last night so it'll just be on the drive.

                    Comment

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