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Knackered Rear Shocks

baldilocks
Snr Member
Posts: 280
Joined: Tue Jun 24, 2014 9:44 am
Location: Invercargill, New Zealand

Knackered Rear Shocks

Postby baldilocks » Fri Jan 12, 2018 10:51 pm

I was sorting the rear shocks on daughters jag, Jerry a 3.2. I went for a ride in the back which is unusual and there was a constant knocking, when asked apparently been there "for ever"..
No surprise knackered bush on the shock passenger side. To fix I took shocks of our spare car and built 1 good set out of the 2 with best composite set of bushes. However I found this on one shock, fortunately on the scrapper but those shocks had originally been on hers and were swapped a couple of years ago.
Image
Looks like it has moved, the shaft of the shock has eaten through the bush and the top housing. Didnt know they could do that. So glad it was no longer on daughters car.
A Monroe shock which I notice do not get a good rep on here. Needless to say will not be using that again, its now relegated to keeping spare car movable.
93 4.0 Sovereign, James, 687486, 94MY
A family of six Land Rover from a 1957 S1 to 1993 200TDI 110 CSW
1967 MGB GT

NO LONGER WITH ME
93 3.2 XJ6, Jerry, 94MY, went to daughter but gone from there as well as.
93 3.2 XJ6, parts supply, 94MY, scrapped

naki_k
Super Moderator
Posts: 28613
Joined: Sun Feb 21, 2010 9:25 pm
Location: Kirton, nr Boston, Lincolnshire

Re: Knackered Rear Shocks

Postby naki_k » Tue Feb 06, 2018 11:32 am

I have seen this issue quite often, even on OE rear shocks. So I don’t think it’s specific to Monroe/ aftermarket parts.
Essentially, the central rod is not being kept in the Centre by the bushes, so moves around. Over the space of the cars lifetime will produce this wear.
I think there should be a top hat type bush in the middle, there. I bought some PU versions to try out to see if they can hold the position better. But I haven’t tested them yet.
SNG Barratt have them last time I looked.
88 3.6 XJ6 PDH/CEM
90 Range Rover Vogue SE 3.9 V8 LPG
91 4.0 XJ6 Manual
92 4.0 XJR Manual
92 4.0 XJR
93 3.2s - 4.0 Manual conv
93 4.0 Sovereign
93 6.0 XJ81 DD6 x2
93 6.0 XJ81 XJ12
94 4.0 XJR
94 4.0 Daimler
96 4.0 X306 XJR
96 4.0 X300 D6
97 4.0 X300 Sport Manual
2000 LR Discovery ES TD5 A
Breaking 40/ 300

Donkeychote
Posts: 166
Joined: Fri Jun 20, 2014 1:17 pm

Re: Knackered Rear Shocks

Postby Donkeychote » Tue Feb 06, 2018 6:14 pm

The same happened on my car. Don't use that top plate again, because if it's the same as on mine, it will eat through new bushes really quickly. I was stupid enough to try, and had to re-do them in a year.
1988 3.6 Sovereign Talisman Silver Metallic

pimgmx
Posts: 3303
Joined: Tue Jul 08, 2014 12:07 pm
Location: South East of the Netherlands

Re: Knackered Rear Shocks

Postby pimgmx » Tue Feb 06, 2018 6:52 pm

Just adding more pictorial evidence: these came from my Sovereign...

Image

Image

the daily: 01 S8 http://bit.ly/2kIwP4m
the tractor: 77 LaRo LW https://bit.ly/2Hr9n6y
the eyecatcher: 93 Insignia http://bit.ly/1iGrmsU
the GT: 89 XJS http://bit.ly/1WQGpC5
the project: 95 X306 http://bit.ly/1cW11DN
the pocket rocket: 97 Z3 http://bit.ly/12IfE7B
the ex: 93 3.2 http://bit.ly/14GTNrq

abercanadian
Posts: 1316
Joined: Tue Oct 16, 2012 6:50 am
Location: Vancouver Island

Re: Knackered Rear Shocks

Postby abercanadian » Tue Feb 06, 2018 7:23 pm

When I changed mine (they weren't as far gone as the above BTW :) ) I ended up using the X300 style upper bush arrangement. The shocks came with the necessary parts which do away with the "top hat" bush, replace the steel collar with a thicker one, use a pair of much larger isolators and a pair of "deep-dish" washers with a more pronounced flat near the centre. A couple of years and 10,000 kilometers later, no issues.
This "improved" system would work on any earlier year shock, but of course you would have to source the newer bits individually as they only come with the later shocks for cars with X300 style cast wishbones.

The ones I took off had the disintegrated top hat bushes and at first I thought I'd ordered the wrong shocks because of the different upper layout but when I fitted them the isolation system made sense even though the top hat bush was "missing".

Image

Image

Image

cheers

Larry
Image
94 XJ40 VDP vin 701729
Oyster Metallic/Doeskin on Aero Alloys
230,000 Kilometers 143,000 Miles
Daily Driver

94 XJ40 SOVEREIGN vin 703632
Diamond Blue Metallic/Barley
111,000 Kilometers/69,000 Miles
Parts Car

Bruce69
Posts: 76
Joined: Wed Apr 04, 2018 2:16 pm

Re: Knackered Rear Shocks

Postby Bruce69 » Thu Jan 24, 2019 2:57 pm

My rear shocks are in need of changing, and I'm in the process of ordering new ones as well making sure I have the x300 type upper bushing arrangement, as described above.

What I'm concerned about is a note of caution in the Haynes Manual ( :!: ) which states that you shouldn't attempt to compress the springs using standard strut spring compressors because these springs are a lot stiffer.

Is this really true, or is it the usual Haynes "use special tool / cautious" approach and in actual fact using a good quality set of compressors is fine :?:
XJ40 3.2 LPG 1991 54k
Jeep Grand Cherokee Overland 4.7 V8 HP LPG 2002
Dodge Charger R/T 1969

katar83
Posts: 2740
Joined: Tue Aug 23, 2011 11:17 am
Location: Cambridge

Re: Knackered Rear Shocks

Postby katar83 » Thu Jan 24, 2019 3:59 pm

Bruce69 wrote:My rear shocks are in need of changing, and I'm in the process of ordering new ones as well making sure I have the x300 type upper bushing arrangement, as described above.

What I'm concerned about is a note of caution in the Haynes Manual ( :!: ) which states that you shouldn't attempt to compress the springs using standard strut spring compressors because these springs are a lot stiffer.

Is this really true, or is it the usual Haynes "use special tool / cautious" approach and in actual fact using a good quality set of compressors is fine :?:


Lies. Heavy duty standard spring compressor are more than adequate ;)

Front springs on the other hand are different kettle of fish entirely of course.
1997, 4.0 LWB X300 - Unlucky car but still a daily driver.
1988, 3.6S XJS - Never ending restoration project.
1994, 3.2S X300 - Accident damaged, October 2015. Gone!
1994, 3.2S XJ40 - Long gone.

naki_k
Super Moderator
Posts: 28613
Joined: Sun Feb 21, 2010 9:25 pm
Location: Kirton, nr Boston, Lincolnshire

Re: Knackered Rear Shocks

Postby naki_k » Thu Jan 24, 2019 6:11 pm

Bruce69 wrote:My rear shocks are in need of changing, and I'm in the process of ordering new ones as well making sure I have the x300 type upper bushing arrangement, as described above.

What I'm concerned about is a note of caution in the Haynes Manual ( :!: ) which states that you shouldn't attempt to compress the springs using standard strut spring compressors because these springs are a lot stiffer.

Is this really true, or is it the usual Haynes "use special tool / cautious" approach and in actual fact using a good quality set of compressors is fine :?:


They will be referring to the front springs there.
The rear springs are not under the same kind of pressures.
88 3.6 XJ6 PDH/CEM
90 Range Rover Vogue SE 3.9 V8 LPG
91 4.0 XJ6 Manual
92 4.0 XJR Manual
92 4.0 XJR
93 3.2s - 4.0 Manual conv
93 4.0 Sovereign
93 6.0 XJ81 DD6 x2
93 6.0 XJ81 XJ12
94 4.0 XJR
94 4.0 Daimler
96 4.0 X306 XJR
96 4.0 X300 D6
97 4.0 X300 Sport Manual
2000 LR Discovery ES TD5 A
Breaking 40/ 300

abercanadian
Posts: 1316
Joined: Tue Oct 16, 2012 6:50 am
Location: Vancouver Island

Re: Knackered Rear Shocks

Postby abercanadian » Thu Jan 24, 2019 6:44 pm

Bruce69 wrote:I'm in the process of ordering new ones as well making sure I have the x300 type upper bushing arrangement

While the X300 top bush arrangement can come with some upgraded late (94MY) style shocks, keep in mind that 'late' shocks won't fit your car; you have pressed steel wishbones with springs that rest on a plate on the shock - the 'late' style has cast wishbones that support the spring directly. The lower bush on the shock is also different.

I'd be surprised if you can find the late upper bush setup independently, but if you can, go for it. :)

Just be careful when you order the shocks ... to be honest, there's nothing wrong with your OEM system especially if you replace the top hat bush with a stronger/harder version; I'd be tempted to make up a teflon one on the lathe!

Larry
Image
94 XJ40 VDP vin 701729
Oyster Metallic/Doeskin on Aero Alloys
230,000 Kilometers 143,000 Miles
Daily Driver

94 XJ40 SOVEREIGN vin 703632
Diamond Blue Metallic/Barley
111,000 Kilometers/69,000 Miles
Parts Car

XJ6Paul
Posts: 66
Joined: Tue Jul 01, 2014 2:29 pm
Location: Atlanta, Georgia USA

Re: Knackered Rear Shocks

Postby XJ6Paul » Thu Jan 24, 2019 11:29 pm

baldilocks wrote:Image


So while we're on the subject, what's the consensus on using an aftermarket top spring mounting if it needs replacing? OEM seems to run well over $200. A few places have a replacement for $80. https://www.fcpeuro.com/products/jaguar ... -mmd3570aa

I hope mine aren't in the same condition as the one in the photo when I get them out, but just in case.
1994 Jaguar XJ12