knock from FOS suspension

Brip · 22nd June 2022, 14:25

Hi all,
another knock problem!! clunk/knock when going over bumps/potholes etc. I cannot find any loose bolts or play with the wheel off, the wheel doesn't give any movement backwards or forwards, drop links look fine, no obvious problem with the shock absorbers, but.......the previous owner put new springs on and on the side which is knocking there is no spring isolator on the bottom of the spring.
Before I go to the trouble of stripping it out, is that simple? Is this the probable cause of the noise or do these rubber isolators just take up a little of the vibration?
Your thoughts gentlemen,

thanks Brian

Rogue · 22nd June 2022, 15:21

Check out the front anti roll bar bushes.

Rover 75 Tourer · 22nd June 2022, 18:44

Quite likley to be drop link. easy way to check remove lower ball joint from anti roll bar get hold of lower joint and push upwards to see if you have any vertical movement. If you have replace link, you can check bottom ball joint as well for play. Also check the mounting bush at the rear of the arm to see if the rubber part has split.Also check the bolts are all tight one the one on the ball joint to the hub and the schock absorber to the hub.

Brip · 23rd June 2022, 08:13

Thanks both for the suggestions, hope to check out the relevant parts and update answer after the weekend

Brip · 26th June 2022, 12:00

Spot on with the drop link!!!

as soon as I took the bottom joint off it was easy to push up and down, hence the knock. Check Ed the other items whilst wheel off a s everything OK, thanks both of you, a quick and cheap fix!

For anyone else doing this I didn't have a problem with the top ball joint, managed it with 2 open ended spanners and cut a few mm off the new thread so I could use a ring spanner. Thanks again guys

22nd June 2022, 14:25	#1
Brip Newbie Rover 75 Tourer Join Date: Oct 2021 Location: Bideford Posts: 11 Thanks: 0 Thanked 1 Time in 1 Post	knock from FOS suspension Hi all, another knock problem!! clunk/knock when going over bumps/potholes etc. I cannot find any loose bolts or play with the wheel off, the wheel doesn't give any movement backwards or forwards, drop links look fine, no obvious problem with the shock absorbers, but.......the previous owner put new springs on and on the side which is knocking there is no spring isolator on the bottom of the spring. Before I go to the trouble of stripping it out, is that simple? Is this the probable cause of the noise or do these rubber isolators just take up a little of the vibration? Your thoughts gentlemen, thanks Brian

22nd June 2022, 15:21	#2
Rogue I really should get out more....... 75 CDT SE 160 Saloon Join Date: May 2017 Location: Thorpe St Andrew, Norwich Posts: 2,657 Thanks: 1,386 Thanked 1,096 Times in 774 Posts	Check out the front anti roll bar bushes. __________________ Glutton for punishment --- Previously ... 2.6 SD1 x 2, 3.5 SD1, 820S, 820Si x2, 216 Gsi, 220T saloon, 414, 45 1.4 x2 and now a Cowley 75 CDT

22nd June 2022, 18:44	#3
Rover 75 Tourer Avid contributor Rover 75 tourers(4)400turs(3 Join Date: Nov 2016 Location: Largs Posts: 219 Thanks: 3 Thanked 67 Times in 56 Posts	suspension knock Quite likley to be drop link. easy way to check remove lower ball joint from anti roll bar get hold of lower joint and push upwards to see if you have any vertical movement. If you have replace link, you can check bottom ball joint as well for play. Also check the mounting bush at the rear of the arm to see if the rubber part has split.Also check the bolts are all tight one the one on the ball joint to the hub and the schock absorber to the hub.

23rd June 2022, 08:13	#4
Brip Newbie Rover 75 Tourer Join Date: Oct 2021 Location: Bideford Posts: 11 Thanks: 0 Thanked 1 Time in 1 Post	Thanks both for the suggestions, hope to check out the relevant parts and update answer after the weekend

26th June 2022, 12:00	#5
Brip Newbie Rover 75 Tourer Join Date: Oct 2021 Location: Bideford Posts: 11 Thanks: 0 Thanked 1 Time in 1 Post	Spot on with the drop link!!! as soon as I took the bottom joint off it was easy to push up and down, hence the knock. Check Ed the other items whilst wheel off a s everything OK, thanks both of you, a quick and cheap fix! For anyone else doing this I didn't have a problem with the top ball joint, managed it with 2 open ended spanners and cut a few mm off the new thread so I could use a ring spanner. Thanks again guys