Loud clunking over bumps rear offside

Mark Heappey · 10th August 2022, 12:45

Need some help trying to locate loud clunk on rear suspension.
My tourer has had completely new rear suspension, subframe, upper and lower arms, coil springs, dampers, anti roll bar bushes and links, brake back plates, handbrake shoes and springs.
The problem I have now is a loud knock on the offside when going over bad roads. I have had everything off this morning and checked for any signs of damage to arms or bushes etc but can find nothing. Mot passed 2 weeks ago with no problems, only thing tester noticed was that the rear bushes on the front suspension were worn and suggested getting them replaced.
My question is can the noise from the front worn bushes transmit through the car and give a false impression that the problem is at the rear. Only other thing would be the rear trailing arm bushes at the toe in brackets possibly past their best.
Anybody else had experience of changing this Bush or am I barking up the wrong tree.
Any help greatly appreciated

Mark

ryszard · 10th August 2022, 13:47

Hi,after I rebuilt my subframe I too developed a knock,turned out the rear section of the exhaust was too near the subframe,I just loosened it and twisted it to get a few more mm gap.Worth checking in case it's the same.Regards Ry...

Mark Heappey · 10th August 2022, 14:13

Checked exhaust and nowhere near subframe.

Lee T · 10th August 2022, 19:14

Check the upper damper nuts are fully tight. And I wouldn't rule out the rear drop links, I had one fail after a week.

Mark Heappey · 10th August 2022, 19:29

When you say rear drop links I assume you mean anti roll bar links. These are new and again have been checked, but thanks for offering advice. Top strut mounts are all tight.

Maxfly · 11th August 2022, 08:31

I had a light knock/rattle from mine when i first got it. This turned out to be the lower bush/dampener for one of the rear shocks (round bit that the lower bolt goes through for the shock). It was tight but just not tight enough, a nip up with a breaker bar solved it.

Although now i have a thought that the tourer might not even have these??

Other than that any heatshields loose or can you recreate the sound buy rocking the car about by hand?

Pete · 11th August 2022, 08:40

Sounds daft, but were the big saucer washers on the bottom damper bolt refitted? Without them the dampers will move around and you'll get a load of thumping. Same thing happens if the same bottom bolt is overtightened, giving the damper some lateral movement. It does tend to get tightened up more than it really needs, and in my case someone really went to town on the o/s/r making it noticeably longer than the other side.

10th August 2022, 12:45	#1
Mark Heappey Avid contributor Rover 75 CDTi Connoisseur SE Tourer Join Date: Aug 2010 Location: Pontefract Posts: 183 Thanks: 46 Thanked 36 Times in 23 Posts	Loud clunking over bumps rear offside Need some help trying to locate loud clunk on rear suspension. My tourer has had completely new rear suspension, subframe, upper and lower arms, coil springs, dampers, anti roll bar bushes and links, brake back plates, handbrake shoes and springs. The problem I have now is a loud knock on the offside when going over bad roads. I have had everything off this morning and checked for any signs of damage to arms or bushes etc but can find nothing. Mot passed 2 weeks ago with no problems, only thing tester noticed was that the rear bushes on the front suspension were worn and suggested getting them replaced. My question is can the noise from the front worn bushes transmit through the car and give a false impression that the problem is at the rear. Only other thing would be the rear trailing arm bushes at the toe in brackets possibly past their best. Anybody else had experience of changing this Bush or am I barking up the wrong tree. Any help greatly appreciated Mark

10th August 2022, 19:14	#4
Lee T Gets stuck in MG ZT Join Date: Jul 2014 Location: Liverpool Posts: 866 Thanks: 180 Thanked 248 Times in 189 Posts	Check the upper damper nuts are fully tight. And I wouldn't rule out the rear drop links, I had one fail after a week. __________________ [SIGPIC][/SIGPIC]

11th August 2022, 08:40	#7
Pete Owners Club Director Rover 75 Join Date: Oct 2006 Location: Sherfield-on-Loddon Posts: 4,874 Thanks: 137 Thanked 996 Times in 444 Posts	Sounds daft, but were the big saucer washers on the bottom damper bolt refitted? Without them the dampers will move around and you'll get a load of thumping. Same thing happens if the same bottom bolt is overtightened, giving the damper some lateral movement. It does tend to get tightened up more than it really needs, and in my case someone really went to town on the o/s/r making it noticeably longer than the other side. __________________ Follow The Club On Twitter

10th August 2022, 13:47	#2
ryszard Gets stuck in Moonstone diesel,X351 Jaguar and now MG ZT 260 Join Date: Dec 2013 Location: Northampton Posts: 682 Thanks: 288 Thanked 118 Times in 96 Posts	Hi,after I rebuilt my subframe I too developed a knock,turned out the rear section of the exhaust was too near the subframe,I just loosened it and twisted it to get a few more mm gap.Worth checking in case it's the same.Regards Ry...

10th August 2022, 14:13	#3
Mark Heappey Avid contributor Rover 75 CDTi Connoisseur SE Tourer Join Date: Aug 2010 Location: Pontefract Posts: 183 Thanks: 46 Thanked 36 Times in 23 Posts	Checked exhaust and nowhere near subframe.

10th August 2022, 19:29	#5
Mark Heappey Avid contributor Rover 75 CDTi Connoisseur SE Tourer Join Date: Aug 2010 Location: Pontefract Posts: 183 Thanks: 46 Thanked 36 Times in 23 Posts	When you say rear drop links I assume you mean anti roll bar links. These are new and again have been checked, but thanks for offering advice. Top strut mounts are all tight.

11th August 2022, 08:31	#6
Maxfly Loves to post MG ZT 190 SE Join Date: Feb 2010 Location: Fort William Posts: 318 Thanks: 407 Thanked 110 Times in 75 Posts	I had a light knock/rattle from mine when i first got it. This turned out to be the lower bush/dampener for one of the rear shocks (round bit that the lower bolt goes through for the shock). It was tight but just not tight enough, a nip up with a breaker bar solved it. Although now i have a thought that the tourer might not even have these?? Other than that any heatshields loose or can you recreate the sound buy rocking the car about by hand?