Polyurethane Shock Absorber Bushes Question XJS V12
#21
It will not cause any problems when you use poly bushes on shock upper mount.
As Agent 00714 says they can't squeak, for they never rotate and just sit there.
The ride will be a little bit harder, and the handling will be a bit, really bit sharper, but I think it's the change that 70 percent people can hardly recognize.
I use poly shock upper bushes on my XJS and once used ones on my X300, they have never caused any problems.
They absolutely lasts longer than OEMs, even longer than rubber ones, if the bushes are made from polyether urethane.
Make sure you are not buying polyester urethane bushes. They will be hydrolyzed in a hot condition and broken down into pieces.
When you use wishbone poly bushes, you may have problems like everyone stated.
As Agent 00714 says they can't squeak, for they never rotate and just sit there.
The ride will be a little bit harder, and the handling will be a bit, really bit sharper, but I think it's the change that 70 percent people can hardly recognize.
I use poly shock upper bushes on my XJS and once used ones on my X300, they have never caused any problems.
They absolutely lasts longer than OEMs, even longer than rubber ones, if the bushes are made from polyether urethane.
Make sure you are not buying polyester urethane bushes. They will be hydrolyzed in a hot condition and broken down into pieces.
When you use wishbone poly bushes, you may have problems like everyone stated.
There are none on there at the moment, they have Completely worn away!
#22
Its the OEM product that got you here in the first place. Those orange Jag bushes are good for about 20 minutes then the disintegration begins.
If you're opposed to poly, then go with an aftermarket black rubber bush. Heck, you can buy generic ones at your local parts store. They are the same as any Ford rod-shock bushing.
Or... go ahead and use the Jag orange ones. And watch them dissolve before your very eyes.....
I'm just sayin... but from experience.
If you're opposed to poly, then go with an aftermarket black rubber bush. Heck, you can buy generic ones at your local parts store. They are the same as any Ford rod-shock bushing.
Or... go ahead and use the Jag orange ones. And watch them dissolve before your very eyes.....
I'm just sayin... but from experience.
I've been riding around without them, since the MOT!
#23
All I've got are 2 bare metal shafts with nuts on top, no wonder the Car was making Screeching noises.
One of the 'Pickiest' MOT's that I can ever remember and they Completely Missed them!
But not as much as I am missing them now!
#26
The bushings on a shock absorber have only one function. To isolate metal from metal. The shock, or damper, does the work. It cannot improve or denigrate a "ride quality" unless it is not there.
That said, I personally hesitate putting "foam" bushings in an area of harsh exposure, i.e. under an automobile subjected to severe compression, weather, heat, dirt, flying debris etc.
If you like replacing bushings, which I grant you, in THIS application is easy to do, then by all means, use the sacred Jaguar foam.
I prefer doing a job as few times as possible.
Just my
That said, I personally hesitate putting "foam" bushings in an area of harsh exposure, i.e. under an automobile subjected to severe compression, weather, heat, dirt, flying debris etc.
If you like replacing bushings, which I grant you, in THIS application is easy to do, then by all means, use the sacred Jaguar foam.
I prefer doing a job as few times as possible.
Just my
#27
#28
The bushings on a shock absorber have only one function. To isolate metal from metal. The shock, or damper, does the work. It cannot improve or denigrate a "ride quality" unless it is not there. That said, I personally hesitate putting "foam" bushings in an area of harsh exposure, i.e. under an automobile subjected to severe compression, weather, heat, dirt, flying debris etc. If you like replacing bushings, which I grant you, in THIS application is easy to do, then by all means, use the sacred Jaguar foam. I prefer doing a job as few times as possible. Just my
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Greg in France (09-14-2014),
orangeblossom (09-14-2014)
#29
Greg
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orangeblossom (09-14-2014)
#30
Obviously this is an exaggerated example, but the shock bushes are one link in a carefully calculated "chain" of things that together give the famous Jaguar ride/handling compromise.
Greg
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orangeblossom (09-14-2014)
#31
This is not actually true. There is a moment when the suspension wishes to deflect and the shocker's "sticktion" prevents it moving. The soft bush gives at this moment to prevent the road shock being transmitted to the body. The harder the bush, the more shock is transmitted. If you imagine a rally car with all-rose jointed suspension, regardless of the spring rate and the shocker bump and rebound settings selected, that car will have a very harsh ride. As will your Jaguar road car if you rose joint the suspension and have solid shocker and chassis subframe mounts!
Obviously this is an exaggerated example, but the shock bushes are one link in a carefully calculated "chain" of things that together give the famous Jaguar ride/handling compromise.
Greg
Obviously this is an exaggerated example, but the shock bushes are one link in a carefully calculated "chain" of things that together give the famous Jaguar ride/handling compromise.
Greg
Although there are many differences of opinion, Poly vs OEM I think you have convinced me, that OEM would be the way to go as I too, do not want to spoil that lovely Jaguar Ride.
Seeing that She is a Fair weather Car, I would be quite happy if they lasted only a year, as now I've pulled it all to bits it really doesn't look that hard to do.
I guess I'm suffering 'Mission Creep' (oh no! not another problem!)
I'm really hacked off with the Garage that did the MOT, as they completely missed the fact that all the Shock Absorber Bushes had gone missing!
I'll leave you with the photo and then continue with a (New Reply) just in case I get timed out again!
This is a Classic example of why it pays to work on your Car yourself!
Do you remember in June this year, I said I was getting a noise like Breaking China, well this is more than likely the reason for that.
Metal against Metal rubbing up and down in the Engine Compartment.
#32
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orangeblossom (09-14-2014)
#33
I doubt it will be that hard. Get a spring compressor (one which works from inside the spring instead of on the outside), insert it from beneath (of course jack the car up first!) and then compress. Undo the lower carrier plate und remove the spring. The damper is just a thing of undoing a couple of screws. You might as well though, whilst at it, replace the shock absorbers... When out, they are out. So instead of doing a job twice, do it once correctly
#34
The Shockers look and Feel Ok.
And now I've taken the Washers out there is no rust whatsoever on the mountings.
But I did get the urge to experiment! So you better get ready to put your head in your hands!
And if you start going 'OMG what is he up to now!'
Then I will abandon Ship and go back to 'Plan 'A' with the OEM Bushes.
But when I saw the GF's Chopping Board, which was made from Polyurethane!
The Temptation to get the drill out, was just too hard to resist! So I made a Set of 'Polyurethane' Shock Absorber Bushes out of it!
Needless to say She was just as Thrilled as when I 'nicked' some Acetone out of her 'make up case'
I cannot lie, She just went Bananas!
Anyway the Bushes I made look almost as good as the ones that you can buy for £25! but seeing as I have never actually seen them in the 'flesh'
I'm not sure if they are meant to be completely flat on both sides, or whether they are meant to have some sort of shoulder on, to fit in the hole?
Good idea? Bad idea? or go back to 'Plan 'A' and fit the OEM?
I was just trying to save a few bob, as I've still got to spend over a Grand, in order to get my other XJS back on the road.
#35
if you find a replacement poly bush for the front bottom shock please let me know as I need a pair for the spax to match the tops and I cant find them listed by any major manufacturer
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orangeblossom (09-14-2014)
#36
Thanks, I've got the hang of it now!
Over thinking the problem, is always a lot harder, that just getting stuck in!
#37
#38
I doubt it will be that hard. Get a spring compressor (one which works from inside the spring instead of on the outside), insert it from beneath (of course jack the car up first!) and then compress. Undo the lower carrier plate und remove the spring. The damper is just a thing of undoing a couple of screws. You might as well though, whilst at it, replace the shock absorbers... When out, they are out. So instead of doing a job twice, do it once correctly
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orangeblossom (09-14-2014)
#39
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orangeblossom (09-14-2014)
#40
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orangeblossom (09-14-2014)