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Vibration at 50mph supercarry

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    Vibration at 50mph supercarry

    Hello! My 1986 suzuki supercarry romahome has started to vibrate noisily when passing through 50-55mph. Above and below that is ok, and it stops when I let the power off, unless engine braking. Ive checked the rear axle and transmission oil levels are ok, and yanking at the prop shaft doesnt reveal any loosness. Other possibly useful info: I think the clutch might be on its way out as it's difficult to get into first gear sometimes, and the timing needs sorting - it coughs a bit, especially when coasting, but not sure if this could cause the vibration. Where do I start?

    #2
    It could be that the prop shaft damper is no longer damping or maybe a support bearing along the drive shaft is worn. Wheels may need balancing too. Best wait for Ant though.

    Comment


      #3
      Hi Darrenrmoss.
      If you feel the vibration mainly thro' the steering wheel it's likely to be the wheels in need of balancing ( may have lost a wt from one wheel).
      At 55 mph the engine is under some load and that engine was prone to ignition break up under load. An 86 may even still have points and condensor but the most common failing was one of the HT leads to a spark plug.
      I've never had an engine or gearbox mount give any trouble but if one of these has failed you're likely to get a feeling at all speeds.
      The prop shaft is short and from memory is unsupported with balance weights attached to it, just check they are all still there.

      I favour wheel balance for a vibration that has such a small speed window, most other causes can be felt in a greater range.
      Ant

      Comment


        #4
        Thanks guys,

        I don't think it's the wheels, though I'll get them done as elimination - it's too high speed a vibration - a proper buzzing through the seat of your pants (some people pay good money for that) and the entire cab - I don't think the camper pod helps as this resonates like a drum and conversation is suddenly impossible!.

        It had points and a condenser but the previous owner put in an electrical spark doofah that mostly did away with point setting. Not quite figured that out yet.

        I'll try all your suggestions, prop weights, HT leads, mounts, as well as timing, spark plugs, and see what happens!

        Cheers.

        Comment


          #5
          ...ah. It suddenly got worse and now all becomes clear. The prop shaft to diff universal joint has bust. One of the cuppy bits that the universal joint crossy bit sticks into has blown its side. (I'm pretty sure they're the technical terms). Oh well, at least that's a mystery solved!

          However, I'm worried that this might be a symptom rather than a cause?

          Comment


            #6
            Just a thought but some years ago my car would do what you are describing, at about the same speed. I took it to my very trusted tyre place who checked all my balance and tread . All was fine. Then the guy in charge said , hang on I want to check those tyres again. He did and found an enormouse bulge which was on the inside wall of the tyre & I would never have seen it. Thank god he did find it. He told me it would have burst & sent me flying .
            (PROBERLY INTO THE NEXT LIFE )
            He said he could remember seeing something like it before and something just clicked in his memory. May be an idea to get your checked out.

            Comment


              #7
              Prop shaft universal joints used to be a common failure especially as they are most often "sealed for life". If new ones are available (try your local motor factors or internet parts sites before you pay suzuki prices) they are an easy job to replace.

              Peter

              Comment


                #8
                Originally posted by peterholden View Post
                Prop shaft universal joints used to be a common failure especially as they are most often "sealed for life". If new ones are available (try your local motor factors or internet parts sites before you pay suzuki prices) they are an easy job to replace.

                Peter
                They are easy to replace Peter. As long as the person doing it knows the proper way! Pressing or driving the cups inwards, which looks the obvious way, usually finishes up with a new prop. shaft required.
                Jim.
                Keeping people waiting is stealing a part of their lives.

                Comment


                  #9
                  Hi Jim / Peter - can you give further details on how to replace it myself? The Haynes manual says it's not too difficult, however, it says remove the surclip - but there isnt one - the metal on the yoke has been pressed in via little cuts to hold the bearing. I can maybe get them out but how do I do (or get round) the retaining cuts? I'll also need to get hold of the parts - any help with what I ask for exactly?

                  Failing that, there's an option of replacing the whole shaft with a second hand one - but obviously this could also be nearing its life's end!

                  After either option, will I need to rebalance the shaft? Can I do this myself?

                  Cheers guys!
                  Attached Files

                  Comment


                    #10
                    That looks like what they call a staked joint and unfortunately you may have to find a transmission specialist to recondition your propshaft.

                    Peter

                    Comment


                      #11
                      Originally posted by peterholden View Post
                      That looks like what they call a staked joint and unfortunately you may have to find a transmission specialist to recondition your propshaft.

                      Peter
                      Peter's right! It is possible to remove the staking with something like a Dremmel, but it would leave no means of securing new cups.
                      I'm not very familiar with the Karry, but usually the yoke at each end of a prop-shaft is fixed. So the joint cannot be changed in toto.
                      There are prop-shaft specialists in many areas listed in the Yellow Pages. They may be able to help by welding on new yokes, or at least manufacture a new one if replacements are scarce.
                      Whichever, specialist balancing equipment is required to prevent the type of vibration you have already experienced.
                      I do know of a firm in the Sheffield area who would probably sort it for you. But that might be no good. You give no clue as to the area you live in.
                      Jim.
                      Last edited by Twolitre; 18-07-2011, 18:20.
                      Keeping people waiting is stealing a part of their lives.

                      Comment


                        #12
                        I agree with Jim it is difficult to advise on who could do it when we don't know your location.

                        These people have a good reputation http://www.northwestpropshafts.com/

                        They are at a place called Coppull just outside Chorley in Lancashire


                        Peter

                        Comment


                          #13
                          Thanks for your advice. I think it's going to be easier to put a second hand shaft in. I've found one I can have for £50.

                          I live in Grenoble in France! So everything's twice as difficult here. But my dad lives in Preston so that Chorley address might just come in handy - thanks for that!

                          I'll have to keep my fingers crossed that the replacement doesn't need balancing and stays in one piece!

                          Comment


                            #14
                            Originally posted by darrenrmoss View Post
                            Thanks for your advice. I think it's going to be easier to put a second hand shaft in. I've found one I can have for £50.

                            I live in Grenoble in France! So everything's twice as difficult here. But my dad lives in Preston so that Chorley address might just come in handy - thanks for that!

                            I'll have to keep my fingers crossed that the replacement doesn't need balancing and stays in one piece!
                            Unless there is serious wear in the replacement it should not need balancing. Propellor shafts are normally balanced OFF the vehicle and should only need re-balancing if damaged in some way.
                            If it does vibrate it is probably a sign that the universal joints on that shaft are worn and you should push for a refund rather than trying to get it balanced.
                            Jim.
                            Keeping people waiting is stealing a part of their lives.

                            Comment


                              #15
                              Update

                              Quick update - it's annoying when there's no "closure" to a forum topic!!

                              2nd hand prop shaft arrived - perfect nik. Fitted in 5 minutes (possibly the most straightforward job Ive ever done on a vehicle!). Irksome noises instantly cured.

                              Thanks for everyone's advice. Job done. Next...

                              Comment

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