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One for Andoo

on Wed 1 Nov 2017 - 18:26
One for Andoo.

For a while, as some of you may know, my XF had rattles from the rear end. Last week I took the car in thinking it was the rear shocks. The specialist took the shocks out and they were fine. They asked me to come down to see what they had found in the shock housings - see photos.

These housings are basically cups that locate the shock tops, that bolt through into the car (in the boot). They are not structural, and are welded to the underside of the boot. The photos show cracks in the top of the cups (and the tops of the shocks where you can see the rub marks); they appear to start on the welds and near the bolt holes. There is no evidence of any underside / major impact damage through impact or severe bottoming out of the suspension. To me it look like a weakness on the welding line.

The theory is that these slits caused the creaking / rattling noise. Since putting the car back together the car has made no noises - just Jag type silence! I have sent the pictures to Jaguar customs care, and they have said to take it to a Jaguar dealer for diagnosis!? My feeling is that it could be on other XFs, but it is a place that would be looked at / noticed very often..

They would be very difficult to weld and repair; as the car is silent I'm rather concerned about trying a fix. The main thing is, is it safe?!







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Re: One for Andoo

on Wed 1 Nov 2017 - 20:14
What did the garage say about them ??
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Re: One for Andoo

on Wed 1 Nov 2017 - 20:25
The garage (the Jag specialists) said they'd not seen it before, but they wouldn't look up into the cups anyway! They said to send pics toJaguar customer care. They have said to take it to one of their garages for diagnosis - that will cost, and probably throw no light on the matter! They will also suggest they plug the car into their computer - (@£165). They tried that with the supercharger rattle, and were quite taken aback when I suggested a broken part wouldn't flash up on their system!! Idiots....

I took the photos at the specialist with their main chap - he said there was no evidence of accident damage. I might get them to look at the cups on an XF they have for sale there - only takes a few mins to remove the shock.

Very odd. I bet there are other cars with a similar thing...
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Re: One for Andoo

on Wed 1 Nov 2017 - 21:18
Surely where the top of the shock absorber mounts to the chassis is structural? Isn't this the part of the body work that takes the load when the shocker compresses?
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Re: One for Andoo

on Wed 1 Nov 2017 - 21:25
+1 for teeps there. Thats more than worrying.
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Re: One for Andoo

on Wed 1 Nov 2017 - 21:42
Not sure - the shock bolts are located inside the boot - there is no deformation there, just the locating cups; only viewable from below with the shocks removed. The cups are welded to the underside of the boot.

If the suspension had severely bottomed out, then there would surely be damage to the plate inside the boot.....

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Re: One for Andoo

on Thu 2 Nov 2017 - 8:26


What I would do with my limited knowledge of these things is. Assume it's safe, as it's been taken apart and put back tighter than it was before as it makes no rattles it might be ok. If it's starts making a noise again get the mangled bits replaced with new ones. if it goes wrong again sell it immediately and let someone else try.




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Re: One for Andoo

on Thu 2 Nov 2017 - 17:26
I'm with Teeps and JohnC - I would haunt Jaguar HQ for an explanation at zero cost to you...if no early positive reply I would go to the top man in the UK asking for comment.

These pictures would definately not be welcome on motoring websites or on soshulmeeja...

Good luck - I would not comfortably live with this on my 51 reg X Type let alone your motor...

VFC
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Re: One for Andoo

on Thu 2 Nov 2017 - 18:35
Jaguar (dealership) have responded to my email, and will take a look at it for £126 incl. It's a fairly quick job to drop the shocks. My suspicion is that my car is not the only one. It is in a location where you would very rarely look - if ever!

I am going to ask a few XF friends if they wouldn't mind having theirs checked at my local specialist's.

I'm still driving it rather gingerly - it's when cornering the forces are using the cups to the side. I really think it's potentially a design fault, with the drilled holes and welding running too close to a weld. Also a very difficult place to weld / fix!!
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Re: One for Andoo

on Thu 2 Nov 2017 - 20:11
My guess, looking at that, is that the tension of the nuts that hold the shock absorbers to the body has been uneven. This will have had the effect of having (for instance) all the stress of an impact (pot holes, speed bumps, general undulations in the road) will have been shot through that one hole and the millions of tiny impacts has caused metal fatigue.

The simple way to fix this is weld the cracks, add in a plate on top of the strut mount to spread the forces and torque them evenly. I would even apply something such as Tiger Seal to the mating faces so that when it dries, the elastic of this stuff also soaks up some of the shocks of the impacts and spreads the load evenly.

That's just my humble....
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Re: One for Andoo

on Thu 2 Nov 2017 - 20:44
Doo 1 wrote:My guess, looking at that, is that the tension of the nuts that hold the shock absorbers to the body has been uneven. This will have had the effect of having (for instance) all the stress of an impact (pot holes, speed bumps, general undulations in the road) will have been shot through that one hole and the millions of tiny impacts has caused metal fatigue.

The simple way to fix this is weld the cracks, add in a plate on top of the strut mount to spread the forces and torque them evenly. I would even apply something such as Tiger Seal to the mating faces so that when it dries, the elastic of this stuff also soaks up some of the shocks of the impacts and spreads the load evenly.

That's just my humble....

Thanks for that old boy! The interesting thing is that the cracks are in the same place on each side - rear / to the outside. The plate inside the boot (above the housing in the photos), is undamaged. So you're suggesting a sort of 4 hole top plate to sit above, plus the welding? This would have to be done from below the car, up into the housings - not much space...

I'm going to get the master-technician (Jag's word!) to look at it in Bristol, so he can talk to Jaguar. I have read other stories about noisy rear ends that have been resolved by dealerships by loosening and then re-tightening the shocks..... make you think!

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