Weird knock. Is it an engine mount? Which one?

LittleMan · 11th March 2019, 23:42

Hi,
My new old 75 2.5 auto is making a weird noise, like a knock, at various times. Is not linked to going over bumps specifically, although sometimes it makes the noise in those cases also. Light movement left and right, you can hear it; under hard acceleration is not there.
I can feel the knocks in the floor and pedal acceleration somehow.
On the other hand the steering feels jerkys, so it could be the droplinks, or something totally different.

How do you guys analyse the knocks in Rovers, and find the faulty part?

Thanks!

cbr1100xx · 12th March 2019, 04:38

Possible top mounts?

LittleMan · 12th March 2019, 04:42

How do I check for top mounts specifically?

trikey · 12th March 2019, 07:25

Sit in the car with the engine off, wobble the steering wheel from left to right and see if you can hear it knock.

roverbarmy · 12th March 2019, 14:10

Check the rubber bushes at the rear of the front wishbones. They can knock on acceleration and deceleration.

LittleMan · 13th March 2019, 10:43

Ok, engine off, wobble wheel and there are different knocks, I think from the steering rack being forced; if I wobble it slightly at another angle than center, I think I can hear the same knock, but faintly. It’s more like the spring compressing and slipping on a metal surface.
Then, start the engine, and wobble steering. Omg, it makes that noise... I feel like you knock my knees with a hammer. And it’s even worse if you drive at low speeds and wobble steering wheel fast.
Basically the noise is exactly like strong spring moving and slipping around. But the car holds the road very well, doesn’t feel jerkish.

So it’s the top mounts? Or the rear bushings of the arm?
It’s a pain in the ass whichever might be (although it’s better than an engine mount

)

Rev Jules · 13th March 2019, 11:20

Put the steering in a straight line, then try and push each wheel with your foot back ,
if any movement its the bush that is worn.

Rev

ZedTeeT · 13th March 2019, 13:14

My money's on the strut bearings.

EdgarDonaldBalls · 13th March 2019, 18:55

Sounds like strut bearings to me too.

After having nearly everything in the suspension replaced on my car, I was getting what sounds like the same kind of noises, a bit worrying as I had tried to use only good quality parts.

Turns out the garage that changed the front suspension for me hadn't tightened the bolts on the top mount properly.

Had it in today to another garage to check everything over and find the source of the noises before it's MOT and 15th Birthday next month and this is what they found to be the problem.

So mine was actually loose struts but it sounded a lot like when the bearings are worn out and steering felt a bit wonky too.

LittleMan · 13th March 2019, 19:49

Aren’t the top mounts having the strut bearings already installed?
Or top mounts is not the same with top hats?

11th March 2019, 23:42	#1
LittleMan Newbie 75 Saloon Join Date: Mar 2019 Location: Auckland Posts: 20 Thanks: 0 Thanked 2 Times in 1 Post	Weird knock. Is it an engine mount? Which one? Hi, My new old 75 2.5 auto is making a weird noise, like a knock, at various times. Is not linked to going over bumps specifically, although sometimes it makes the noise in those cases also. Light movement left and right, you can hear it; under hard acceleration is not there. I can feel the knocks in the floor and pedal acceleration somehow. On the other hand the steering feels jerkys, so it could be the droplinks, or something totally different. How do you guys analyse the knocks in Rovers, and find the faulty part? Thanks!

12th March 2019, 04:38	#2
cbr1100xx Gets stuck in VW touareg Join Date: Mar 2015 Location: dunsop bridge Posts: 870 Thanks: 225 Thanked 414 Times in 235 Posts	Possible top mounts? __________________ WE WERE BOTH BORN ON THE 4th of JULY CAR DIED 15/11/2022---I'M STILL GOING (JUST)

12th March 2019, 07:25	#4
trikey Premium Trader Rover 75 Join Date: Nov 2010 Location: Devon Posts: 33,764 Thanks: 8,837 Thanked 14,831 Times in 8,030 Posts	Sit in the car with the engine off, wobble the steering wheel from left to right and see if you can hear it knock. __________________ Lest we forget..

12th March 2019, 14:10	#5
roverbarmy This is my second home Roverless + 1.7D Sportage Join Date: Aug 2014 Location: East Norfolk Posts: 7,050 Thanks: 729 Thanked 2,021 Times in 1,449 Posts	Check the rubber bushes at the rear of the front wishbones. They can knock on acceleration and deceleration. __________________ Oil in my veins!

13th March 2019, 13:14	#8
ZedTeeT Gets stuck in MG ZT-T Join Date: Feb 2016 Location: Horsham Posts: 874 Thanks: 197 Thanked 239 Times in 207 Posts	My money's on the strut bearings. __________________ My garage. 03/53 MG ZT-T+ CDTi auto in XPG. 232k and much to do! 21/21 MG ZS ev. Daily. 85/C Capri 2.8i Special. Mine 29+ years. 82/X Talbot Tagora SX V6. Restoration project. 11/11 Hyundai I Load CRDi. Van....... nuff said.

12th March 2019, 04:42	#3
LittleMan Newbie 75 Saloon Join Date: Mar 2019 Location: Auckland Posts: 20 Thanks: 0 Thanked 2 Times in 1 Post	How do I check for top mounts specifically?

13th March 2019, 10:43	#6
LittleMan Newbie 75 Saloon Join Date: Mar 2019 Location: Auckland Posts: 20 Thanks: 0 Thanked 2 Times in 1 Post	Ok, engine off, wobble wheel and there are different knocks, I think from the steering rack being forced; if I wobble it slightly at another angle than center, I think I can hear the same knock, but faintly. It’s more like the spring compressing and slipping on a metal surface. Then, start the engine, and wobble steering. Omg, it makes that noise... I feel like you knock my knees with a hammer. And it’s even worse if you drive at low speeds and wobble steering wheel fast. Basically the noise is exactly like strong spring moving and slipping around. But the car holds the road very well, doesn’t feel jerkish. So it’s the top mounts? Or the rear bushings of the arm? It’s a pain in the ass whichever might be (although it’s better than an engine mount )

13th March 2019, 11:20	#7
Rev Jules This is my second home Rover 75 Tourer+ Join Date: Mar 2011 Location: Radcliffe on Trent Posts: 10,709 Thanks: 7,308 Thanked 3,929 Times in 2,051 Posts	Put the steering in a straight line, then try and push each wheel with your foot back , if any movement its the bush that is worn. Rev

13th March 2019, 18:55	#9
EdgarDonaldBalls Avid contributor MG ZT CDTi XPower Grey Join Date: Jan 2017 Location: Chester Posts: 153 Thanks: 31 Thanked 37 Times in 30 Posts	Sounds like strut bearings to me too. After having nearly everything in the suspension replaced on my car, I was getting what sounds like the same kind of noises, a bit worrying as I had tried to use only good quality parts. Turns out the garage that changed the front suspension for me hadn't tightened the bolts on the top mount properly. Had it in today to another garage to check everything over and find the source of the noises before it's MOT and 15th Birthday next month and this is what they found to be the problem. So mine was actually loose struts but it sounded a lot like when the bearings are worn out and steering felt a bit wonky too.

13th March 2019, 19:49	#10
LittleMan Newbie 75 Saloon Join Date: Mar 2019 Location: Auckland Posts: 20 Thanks: 0 Thanked 2 Times in 1 Post	Aren’t the top mounts having the strut bearings already installed? Or top mounts is not the same with top hats?