Member Since: 09 Jun 2021
Location: Sumiainen
Posts: 43
D4 Rear suspension arms replacement
Had my tyres changed yesterday and found out that the rear right side tyre was worn on the outside edge.
Also the rear upper knuckle bearing on the right side are in an angle compared to left side,
photos enclosed.
I have also noticed a "clunky" sound when driving on uneven gravel roads at slow speed.
Front lower arms was replaced earlier this year with Meyle arms.
Car has now about 300.000km = 186.000 UK miles
Had the 4 wheel alignment done some months ago, car is driving straight.
My question is:
Should I replace at the rear both arms, upper and lower or just the lower?
I tried with a crowbar to determine if some bushing are bad, but couldn't feel any real difference.
I have a hydraulic press, but plan to buy complete arms instead of fitting just new bushings.
Any particular brand to avoid?
TIA
30th Aug 2023 8:32 am
Mastertech
Member Since: 13 Apr 2014
Location: North East
Posts: 132
I would advise getting someone who knows Disco’s to look over the suspension and tell you what needs attention. Changing parts on a whim gets expensive when it could just be an upper or lower rose joint or a tie rod that’s worn.
30th Aug 2023 11:37 am
Murtovaara
Member Since: 09 Jun 2021
Location: Sumiainen
Posts: 43
Mastertech, agree it would be best, but unfortunately Discos are quite rare here, so nobody around who
would have a clue about the Disco suspension. I have >200km to LR Service.
Also the car has done some mileage, so probably it show as some amount of wear here and there.
I'm hoping that someone would had had same issue and if it was enough to replace only lower arms as was the case in front, or if it's best to replace both arms in rear and all 4 knuckle bearings?
30th Aug 2023 12:16 pm
rrhool
Member Since: 28 Aug 2014
Location: Norfolk
Posts: 4536
The angle of that joint will depend what height the suspension is. The joint twists as the suspension goes through its travel, that's part of the design.
You can't determine the condition of the joint by the angle it's at.
The clunky noises are suggesting that something is in need of attention.
Was the tyre worn on one edge before you had 4 wheel geometry done?Richard
D3 SE 2007. Triumph 2.5Pi 1973. Ferguson TEA20 1948.
Discovery 2 4.0 ES 2001- Gone
Discovery 1 300Tdi ES '95 - Gone
Range Rover Classic '79 - Gone
30th Aug 2023 12:24 pm
Murtovaara
Member Since: 09 Jun 2021
Location: Sumiainen
Posts: 43
Both pictures taken when the wheel was removed, eg. the suspension was fully extended,
so same condition. What somewhat bother me is that why there is a difference in the angle.
After I changed the front lower arm the suspension was aligned, this was in June and alignment
was checked in August as the car was drifting right. Enclosed alignment data where I tried to
translate the headers to English. Had to admit that I'm not sure if the uneven wear was before
the August alignment or not.
August
Click image to enlarge
June
Click image to enlarge
30th Aug 2023 12:59 pm
Mastertech
Member Since: 13 Apr 2014
Location: North East
Posts: 132
Looking at the pictures the top hub rose bush is sitting at a different angle on the right than the left, the left being straight. The question is, what does this mean and is it related to your tyre wear.
You need two people to check the suspension and a lever bar. Jack up the rear suspension at the lower shock absorber mounting so that the wheel is about an inch off the ground. Check for play left to right and then up and down at the wheel. If movement is present ask the second person to look and tell you where it is coming from.
If no play then use a lever bar under the wheel from the side and you need to rock/ lift the rear hub to check the top and bottom rose bushes for play.
30th Aug 2023 3:44 pm
Murtovaara
Member Since: 09 Jun 2021
Location: Sumiainen
Posts: 43
I can't find any play in the bushings or bearing. No bearing noise while driving, the new tyres are very quiet.
Lifted the rear from rear shock mount, not from chassis.
But some of the bushings in the suspension arms are not in center, I'm not native English difficult to express what I mean, see enclosed photos.
The tie rod is also not in center, but when I removed it, can't find any play in the bearing/bushing.
No play in swaybar bushings or the link rod.
(Had my knee just done and very difficult to bend down to take photos, apologize)
Click image to enlarge
Click image to enlarge
Click image to enlarge
1st Sep 2023 9:17 am
kim0785b
Member Since: 12 Feb 2021
Location: London
Posts: 141
not an expert, but those arms look shot to me. the bushings seem well on their way out.
worth replacing the brake line brackets/holders at the same time,Discovery 4
Oct 2015, 2016 build
SDV6 Santorini Black SE
New engine at 42k
Car camper
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