X308 17" Solar Alloys wanted
Discussion
Steve, just bought a 2002 xjr and noticed vibrations at 70ish thruogh the seat of the pants and through the steering wheel. Is the issue normally due to wheel buckles or imbalance or are there other reasons ie bushes etc? Was going to replace all of the bushes but want eliminate the cheaper options first.
ps got a spare wheel off big rod and changed it to see if problem disappeared. It flet better but it wasnt completely eliminated.
pps sorry for the thread hijack
ps got a spare wheel off big rod and changed it to see if problem disappeared. It flet better but it wasnt completely eliminated.
pps sorry for the thread hijack
chancha said:
Steve, just bought a 2002 xjr and noticed vibrations at 70ish thruogh the seat of the pants and through the steering wheel. Is the issue normally due to wheel buckles or imbalance or are there other reasons ie bushes etc? Was going to replace all of the bushes but want eliminate the cheaper options first.
ps got a spare wheel off big rod and changed it to see if problem disappeared. It flet better but it wasnt completely eliminated.
pps sorry for the thread hijack
Vibration through both the seat and steering wheel suggest problems with both front and rear wheels especially at any particular speed. First thing to do is make sure it's not made any worse under light to medium braking - that'll eliminate warped or unevenly worn discs.ps got a spare wheel off big rod and changed it to see if problem disappeared. It flet better but it wasnt completely eliminated.
pps sorry for the thread hijack
Next take the car for a 10 mile or more drive to get the tyres warm and then straight away jack each corner up and turn the wheel by hand with a block of wood just touching the tread. Watch the gap between the wood and tyre tread to see if it varies as you turn the wheel. If it does then you have you have flatspotted tyres. If not then I'd suggest having all 4 wheels balanced as accurately as possible, and for this you'll need a tyre fitter with a properly calibrated balancing machine. Lots of garages accept an imbalance of 10g or so as being OK as it won't get noticed on most cars but it will with an XJ. In an extreme case you may have to get a Road Force balance done which Jaguar issued a TSB about some while ago. Very few garages have the correct Hunter machine to do this (there's only 3 in Essex to my knowledge) and it's time consuming and expensive so only worth doing if you have tyres in good condition and have elimated any other source.
If you have radially buckled wheels or permanantly flatspotted tyres then no amount of balancing will cure this. A worn shockabsorber will not damp road vibration properly either and a out of balance propshaft or worn UJ's will cause vibration too - although usually between 50-60MPH and not higher speeds. Have a play about with tyre pressures too - lowering the pressure to the minimum setting makes the sidewalls flex and heat up more and that'll often improve a subtle tyre related vibration to the point where you can live with it.
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