Hi Jim, I think your last comment has got it. The loose gaiter flopped around being more out of balance but both gaiters secure they still move more each rotation compared to the other side. You cannot see any bend in the shaft at low revs so I will go with the joint(s) on that side.
In the meantime I have just managed to balance the vibration out with a bit of science and a bit of luck. Totally gone now. And that is with the weight attached at the inboard end of the shaft. So supporting the idea it's not the hub or wheel. I think it's time for a new driveshaft. Last one I did was a few years ago but I recall it was not a bad job, just heavy. Just a case of finding a replacement. But that will come later. The Coupe is going to be Eddie-ized at the weekend. Hopefully it will be Super-Coupe in a months time! Onwards and upwards for the quality of the car. (and the bills) Cheers Derek On 9 Oct 2013, at 12:35, Jim Hearne wrote: > It could be either the driveshaft is bent, or it could be wear in the > driveshaft joints themselves. > Do you get much backlash in the joints if you hold one half and try to turn > the other half ? > > I'm not sure if the MOT would say anything but I'd still be worried as to why > it would need balancing, the only reason i can think of is it's bent. > > Can you borrow a dial gauge to put up against the centre of the shaft and > turn the wheel by hand. > > I'm quite surprised that the loose gaiter clip would change the vibration, > I'm sure they are small enough mass that they wouldn't cause it in themselves > but maybe the more secure gaiter is damping some of the vibration, maybe from > a worn joint. > > Jim > > > > -----Original Message----- From: Derek Clews > Sent: Wednesday, October 09, 2013 12:23 PM > To: [email protected] > Subject: Re: [Quantum Owners] Balancing a drive shaft > > Thanks all, much appreciated. > > The problem has been there in varying degrees since I have had the coupe. It > is the usual 65mph resonance. Sometimes it seemed to be very little, other > times significant, but never gone. But it has not been the priority issue. > I am now going though the process of diagnosing the problem and have had the > wheels very closely balanced and tried changing them around, check tightened > all suspension bolts, serviced the brakes and finally had a brainwave. At > one point I found the outer offside (long) shaft ball joint gaiter clip > undone. Securing it again reduced the vibs. > > I put the car on a solid chassis ramp and ran it up. Looking at the rotating > components that shaft is the only one looks as if it is vibrating. (i.e. has > a fuzzy outline with 65mph on the speedo, more solid when lower speed and no > vibs. felt) But the offside wheel is responding. (changing the wheel made no > difference - unless there are two wheels that balance fine, but don't run > true on the hub!) Nearside looks solid and the wheel and tyre solid, too. > Then tried it without wheels at all. There is still a buzz when the wheels > are removed but obviously not the same vibration. Hence the idea to try a > DIY balance of the shaft. > > So if I succeeded is there a possibility I would have problems with MOT or > not in your opinion? > > I suppose wheel balancing on the car might still solve it even if it is the > drive shaft. But it would not be the best solution. If I can balance shaft > that would prove the problems source and I might still change the shaft. Or > maybe it is the gearbox output Jim (!) > > Derek > > > On 9 Oct 2013, at 09:50, <[email protected]> > <[email protected]> wrote: > >> I had a similar problem on a 2+2 a few years ago. >> Checked everything and had the wheels balanced off the car - couldn't solve >> the problem. >> Ended up having finding a garage that could balance the wheels in situ (on >> the car). >> That solved the problem. >> >> AJ >> >> -----Original Message----- From: Jim Hearne >> Sent: Wednesday, October 9, 2013 9:26 AM >> To: [email protected] >> Subject: Re: [Quantum Owners] Balancing a drive shaft >> >> I have to admit to having changed a gearbox on a car to fix a vibration >> which turned out to be the front tyres........ >> >> Jim >> >> >> -----Original Message----- From: Nigel Plant >> Sent: Tuesday, October 08, 2013 10:52 PM >> To: [email protected] >> Subject: Re: [Quantum Owners] Balancing a drive shaft >> >> Agree with Jim. Not sure what points to the drive shaft, but the other >> potential one, which I've had problems with in the past is tyre faults. Try >> switching wheels front to back, one at a time. >> >> -- >> -- >> You received this message because you are subscribed to the Google Groups >> "Quantum Owners Group" group. >> To post to this group, send email to [email protected] >> To unsubscribe from this group, send email to >> [email protected] >> For more options, visit this group at >> http://groups.google.com/group/quantumowners?hl=en >> >> IMPORTANT NOTE: All information presented herewith is provided on an "As Is" >> basis, without warranty or the implication thereof. 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Neither the Quantum >> Owners Club nor the individuals associated with the Quantum Owners Club or >> in the preparation of the above information shall have any liability to any >> person or entity with respect to liability, loss, or damage caused or >> alleged to be caused directly or indirectly by the instructions contained >> within this or related message(s). >> --- You received this message because you are subscribed to the Google >> Groups "Quantum Owners Group" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> For more options, visit https://groups.google.com/groups/opt_out. >> >> -- >> -- >> You received this message because you are subscribed to the Google Groups >> "Quantum Owners Group" group. >> To post to this group, send email to [email protected] >> To unsubscribe from this group, send email to >> [email protected] >> For more options, visit this group at >> http://groups.google.com/group/quantumowners?hl=en >> >> IMPORTANT NOTE: All information presented herewith is provided on an "As Is" >> basis, without warranty or the implication thereof. Neither the Quantum >> Owners Club nor the individuals associated with the Quantum Owners Club or >> in the preparation of the above information shall have any liability to any >> person or entity with respect to liability, loss, or damage caused or >> alleged to be caused directly or indirectly by the instructions contained >> within this or related message(s). >> --- You received this message because you are subscribed to the Google >> Groups "Quantum Owners Group" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> For more options, visit https://groups.google.com/groups/opt_out. > > -- > -- > You received this message because you are subscribed to the Google Groups > "Quantum Owners Group" group. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected] > For more options, visit this group at > http://groups.google.com/group/quantumowners?hl=en > > IMPORTANT NOTE: All information presented herewith is provided on an "As Is" > basis, without warranty or the implication thereof. Neither the Quantum > Owners Club nor the individuals associated with the Quantum Owners Club or in > the preparation of the above information shall have any liability to any > person or entity with respect to liability, loss, or damage caused or alleged > to be caused directly or indirectly by the instructions contained within this > or related message(s). > --- You received this message because you are subscribed to the Google Groups > "Quantum Owners Group" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/groups/opt_out. > > > -- > -- > You received this message because you are subscribed to the Google Groups > "Quantum Owners Group" group. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected] > For more options, visit this group at > http://groups.google.com/group/quantumowners?hl=en > > IMPORTANT NOTE: All information presented herewith is provided on an "As Is" > basis, without warranty or the implication thereof. Neither the Quantum > Owners Club nor the individuals associated with the Quantum Owners Club or in > the preparation of the above information shall have any liability to any > person or entity with respect to liability, loss, or damage caused or alleged > to be caused directly or indirectly by the instructions contained within this > or related message(s). > --- You received this message because you are subscribed to the Google Groups > "Quantum Owners Group" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/groups/opt_out. -- -- You received this message because you are subscribed to the Google Groups "Quantum Owners Group" group. 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