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.
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