xjs vibration/judder mystery
#1
xjs vibration/judder mystery
Hi everyone
Her in cold Norway my XJS relaxes in my garage. Mostly because itīs not very nice to drive. It wobbles and shakes, and itīs really worse at 140 kmh. Its not wheels/rims. Front upper balljoints, wheel bearings and shocks are new. Itīs not engine rpm related, and not load related. Gone trough everything on the car for the last 2 years. Everything looks and feels as it should.
Anyone know about propeller shaft yoke alignment on these cars? or other ideas?
Best regards from Norway...
Her in cold Norway my XJS relaxes in my garage. Mostly because itīs not very nice to drive. It wobbles and shakes, and itīs really worse at 140 kmh. Its not wheels/rims. Front upper balljoints, wheel bearings and shocks are new. Itīs not engine rpm related, and not load related. Gone trough everything on the car for the last 2 years. Everything looks and feels as it should.
Anyone know about propeller shaft yoke alignment on these cars? or other ideas?
Best regards from Norway...
#2
#4
So further interrogation:
- off-load on the over-run the vibration is there just as much as on the power?
- does this happen at all speeds?
- does it increase in frequency the faster the car is going ie speed related (you have said it is not load or engine-RPM related)?
- have you any feeling from where the vibration seems to originate (eg under seat, from the back, from the front)?
- is it more of a fairly low frequency "wobble" feeling or quite a high frequency vibration?
- gearbox/engine mounts not fixed properly
- gearbox output shaft bearing failed
- differential unit coming loose from the cage
- differential-attached brackets to which the bottom rear wishbone is attached coming loose
- bent rear driveshaft
Greg
Last edited by Greg in France; 03-13-2016 at 01:07 PM.
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paulyling (03-14-2016)
#5
Thank you Greg, for replying
The vibration starts being bad at 140 kmh. its still the same even if I put it in neutral. Had the prop shaft down and the UJs ar good. The strangest thing is that it seem to getting worse
after driving a while......
do you know how the prop shafts yokes should be in position to each other, there are no marks in the splined end...
The vibration starts being bad at 140 kmh. its still the same even if I put it in neutral. Had the prop shaft down and the UJs ar good. The strangest thing is that it seem to getting worse
after driving a while......
do you know how the prop shafts yokes should be in position to each other, there are no marks in the splined end...
#7
Thank you Greg, for replying
The vibration starts being bad at 140 kmh. its still the same even if I put it in neutral. Had the prop shaft down and the UJs ar good. The strangest thing is that it seem to getting worse
after driving a while......
do you know how the prop shafts yokes should be in position to each other, there are no marks in the splined end...
The vibration starts being bad at 140 kmh. its still the same even if I put it in neutral. Had the prop shaft down and the UJs ar good. The strangest thing is that it seem to getting worse
after driving a while......
do you know how the prop shafts yokes should be in position to each other, there are no marks in the splined end...
This sounds more and more like the prop being out of balance to me. I happened to me last year with an annoying lowish frequency vibration at about 50 MPH and drove me mad before I nailed it with a new prop, thanks to a suggestion from Brakebuster on this site. JCP lists three different props for the 6 litre dependent on VIN number:
http://www.jaguarclassicparts.com/uk...shaft-assembly
So it would be worth getting your VIN and contacting them to see what is available. In the UK there are loads of specialists who can fix and rebalance propshafts, or even make you a new one, surprisingly cheaply all things considered. If JCP do not have any new ones, David Manners or other specialists like SNG Barratt may well have something suitable.
Greg
Last edited by Greg in France; 03-13-2016 at 01:32 PM.
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Insignia xjs (03-13-2016)
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#8
#9
Thanks a lot Greg.
I will concentrate at the prop shaft. On my car both yokes are in line with each other, but since the input flange of the diff. is off center, I suspect the shaft yokes should be in a certain position to each other, but thats just a very diffuse thought.
I will concentrate at the prop shaft. On my car both yokes are in line with each other, but since the input flange of the diff. is off center, I suspect the shaft yokes should be in a certain position to each other, but thats just a very diffuse thought.
Pretty much the same as the halfshafts.
The only vehicle l have come across with deliberately out of phase prop shaft was p38 range rover although there might be others.
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Greg in France (03-14-2016)
#10
#11
Greg
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paulyling (03-14-2016)
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