Rear end shimmy
#1
Rear end shimmy
My 'new' XJR has a nasty shimmy from the back end when going over bumps. I've read all about the rear subframe bushes and rear shock absorber issues but there seem to be none of the associated knocks that go with them. Could it still be down to one of these or is it something else?
#2
Welcome to the forum entwistlecymru,
When you get a minute, please follow this link New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum to the New Member Area - Intro a MUST section and post some information about yourself and your vehicle for all members to see. In return you'll get a proper welcome and some useful advice on posting to the forum.
As the shimmy only occurs when going over bumps, it's unlikely to be wheel balancing or a distorted wheel rim. Shock absorber Upper Isolator and Lower Bush are usually easy to spot.
There's a lot of wearing parts in the rear suspension Favourites are:
1. Sub Frame Bushes (arrowed red)
2. Differential Strut Mounting Bushes (arrowed green)
3. Wheel Bearings (arrowed orange)
4. Pivot Bearings (arrowed blue)
You need to get the load off the rear suspension to check for wear. For (1) and (2), support the body under the rear jacking points. For (3) and (4), jack up each side of the vehicle in turn under the rear jacking point.
Graham
When you get a minute, please follow this link New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum to the New Member Area - Intro a MUST section and post some information about yourself and your vehicle for all members to see. In return you'll get a proper welcome and some useful advice on posting to the forum.
As the shimmy only occurs when going over bumps, it's unlikely to be wheel balancing or a distorted wheel rim. Shock absorber Upper Isolator and Lower Bush are usually easy to spot.
There's a lot of wearing parts in the rear suspension Favourites are:
1. Sub Frame Bushes (arrowed red)
2. Differential Strut Mounting Bushes (arrowed green)
3. Wheel Bearings (arrowed orange)
4. Pivot Bearings (arrowed blue)
You need to get the load off the rear suspension to check for wear. For (1) and (2), support the body under the rear jacking points. For (3) and (4), jack up each side of the vehicle in turn under the rear jacking point.
Graham
#4
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Usually, but you can't count on that as the only indicator. Get the wheels off the ground and check for slop by rocking the tire at 12 and 6 o'clock positions
I noticed they're two taper roller bearing so is there some adjustment to be had?
Adjustment is by selective shims between the bearings. There should be a couple thou pre-load. That is, a bit less than zero free play.
Cheers
DD
#6
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#9
#10
Crunching the numbers and saving one more tyre being scrubbed off makes economic sense.
Graham
#11
Well Gents, I've bitten the bullet and order bearings, bushes and shocks for the back. A friend is taking it in tonight so it should hopefully be done by Wednesday. I'll see how much of a difference it makes then! I've also bought a set of new tyres on wheels from a local tyre fitter friend (who happens to have an XJ40 and X300) so they'll be replacing the knackered Dunlops on the back and rock hard 'Primewells' on the front. Next month I'll be curing the various little oil leaks and rebuilding the front end, which brings me on to my next post...........
#13
Well, this reply won't help anyone in the future as all I did was rebuild the entire rear end of the car. However, I can confirm if you spend £800 in parts with Jaguar, your shimmying X300 will be transformed. 18 years of wear hadn't been kind and it now feels brilliant - I can see what all the fuss is about!
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