New tires, new shake! Argh!

(Jason Miller 1993 XJS 4.0 convertible, 1997 XK8 coupe ) #1

Ok so I had new tires put on the 97 XK8 and bhad them balanced too. When I left I noticed some shaking from more than one tire, but had to be somewhere so I didn’t take it right back. I set an appointment to have the alignment done at another shop, and figured I’d have them rebalance the tires. Needless to say they found the rear tires were out of balance,but the fronts were at zero, and that the tech didn’t feel anything on the test drive. Also they couldn’t do my alignment because I don’t have the Jaguar shim and bolt kit yet. So they said take it to the Jag dealer for an alignment. Drrrrrrr. I left and still felt a shake in the steering wheel around 50-55. Drrrrrrr! I thought well I’ll keep driving it for a while and see. Coming home from work the other day staying steady at 50ish it started shaking badly in the steering wheel. I checked my lugs and they looked ok. I drove it home and it seemed better. Today I decided to jack it up and check to see if anything felt loose and it seemed fine. Then I was taking my daughter to work and it started shaking pretty bad again. My daughter said " wow it’s really shaking". Then I hit the brake because someone pulled out, and it shuddered badly and pulled a little to the left! I was tempted to turn around,then it settled down and braking was smooth again! I dropped her off and started home. Lots of traffic and no shuddering, but some shaking in the wheel. Halfway home though, about 20 min, it started again and the shuddering with the brake came back! Came to a stop and it was back to a light shake and smooth braking! ARGH! Any thoughts?

(Grahame Loader) #2

Like the earlier XJ40 and X300 the XK8 needs down-force on the front when doing an alignment. Not many alignment shops have the tools to do it properly. Check with the dealer on who they refer alignments to.

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(Jason Miller 1993 XJS 4.0 convertible, 1997 XK8 coupe ) #3

I didn’t know that! I’ll call one of the local ones about it

(tony) #4

you got to ask how many times they have done alignments on your particular model Jag,
if they admit never…

on most vehicles I have worked upon, a pull to one side is normally associated with some braking issue, which can often be detected by comparing with an IR gun at each disc

(Jason Miller 1993 XJS 4.0 convertible, 1997 XK8 coupe ) #5

I agree 100%. More my confusion is the fact that it comes and goes, and only does it when it starts shaking heavily. And, as much as I hate saying it, it didn’t do it until I had the new tires put on, then more so after taking it in to see about an alignment and having the tires checked for balance. To clarify,they didn’t even try to align it since they didn’t have the shims and bolt set.

(j limongelli) #6

jg2 is correct, to make it the BEST, Jag has straps and I think they want 3/4 tank of gas filled in the tank.
They put it on the rack then strap it at that time.
MAKE SURE THE WHEELS WERE NOT OVER TIGHTENED WITH AN AIR GUN STRIPPING THE THREADS.
The wobble could be balance or stripped lugs, people are air gun happy.
Ive seen them actually PULLED out from so much force that only 3 lugs are hooked up.
The CAMBER was also very STEEP with either the v12 or v8 engines.
It has to be done right, the cars weight over 4,000 lbs
good luck.
Ive had all your models from new…they others are correct.
DEALER ONLY UNLESS A TOP SHOP HAS THE STRAP DOWN SET UP.
GTJOEY1314

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(Ian) #7

I was told by a wise old man , never get your wheel balanced at the same time as you have new tyre fitted , let the tyres settle on the rim for a good few miles .

Ask the people who balanced your wheels , when was the machine last calibrated , they get used and abused , we tend to take things for granted !

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(Neil Bennett. Patron) #8

I had similar on my XJ40 and it turned out to be worn/warped front discs/rotors, may be worth checking them for runout both cold and hot.
All previous comments are also relevant.

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(j limongelli) #9

He had no issue before though, thrown weights or not balanced along with a bad alignment mean a world of difference on those cars.
Again MAKE SURE THE LUGS ARE TIGHT AND HOLDING.
Good luck
gtjoey1314

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(Grahame Loader) #10

Also check for bad u joints. There are a multitude of them in the IRS.

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(Jason Miller 1993 XJS 4.0 convertible, 1997 XK8 coupe ) #11

I did pull the wheels a little bit ago and I (big guy that I am) needed a 3ft pipe to get the lugs loose! I then started looking around and saw corrosion on the contract pads of the wheels and decided to scrape that off. I checked a few other possible causes and everything seemed ok, so I put it back together with a little anti sieze on the contract pads and alternating the lugs to snug then resting it and torquing them to spec. I took it for a nice ride and it seems a lot better. I know it still needs an alignment, but it’s better for sure!

(Grahame Loader) #12

If you need a 3’ snipe on a lug wrench to budge the nuts then they have been massively over-tightened. The speck torque for lug nuts on that car is 70 lb.ft. I believe. That should be achievable with a normal spider wrench.

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(Jason Miller 1993 XJS 4.0 convertible, 1997 XK8 coupe ) #13

Yeah they had to be. It’s amazing how tight they make them sometimes smh

(Robin O'Connor) #14

That’s when you tell them what you think and never go back!!! My tyre place always torques to spec when they do my wheels.

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(Grahame Loader) #15

Same with mine and they have me come back after a day of driving for a re-toque.

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(phillip keeter) #16

I think for most of the “tyre” shops around, the term “spec” refers to something they need to clean off of their glasses.
Phillip

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(Neil Bennett. Patron) #17

Easy buy a torque wrench circa £14.50 and check them yourself, I do for peace of mind and making sure I can undo them in the event of a flat!

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