New noise from the front.

chicochapman · 19th June 2022, 11:32

Its a 2002 KV6 ZTT automatic with 116,000 miles on the clock.
A new noise from the front has appeared which I can best describe as an irregular muffled clonking sound which only appears on the over-run.

Has anybody any thoughts on what it might be ?

Thanks,
Malc

SD1too · 19th June 2022, 13:11

At 116,000 miles has your ancillary belt tensioner ever been renewed?

You could also examine your engine mountings.

Simon

chicochapman · 20th June 2022, 20:21

Thanks Simon.
I have an invoice from MG Rover Mobile Mechanics of Derby dated 2015
showing "all cambelts, cambelt tensioners, guiders and waterpump" were replaced at 87,000 miles.
On reflection, I think the noise is there all the time - its just more apparent on the over-run when the engine is quieter.(my hearing is not too good !)

The lower engine mount was replaced about 2 years ago as I noticed a distinct "clunk" on moving off, however, I'll have a look at the other mountings as you suggest. I'm also thinking of waggling the front wheels to see if its a bearing problem?
Thanks,
Malc

SD1too · 21st June 2022, 07:45

Hi Malcolm,

It was the ancillary belt tensioner I was asking about!

From memory, if you remove the OSF wheel arch liner you can observe it whilst an assistant revs the engine. I once did this on a friend's Saab 9000 and the loss of belt tension was very apparent.

Simon

xsport · 21st June 2022, 12:43

The large bearing housing that transmits the drive shaft to the offside front wheel , have for some members been an issue once they get worn and show signs of play. They can be replaced . You could check that out once you have eliminated the other suggestions first.

chicochapman · 23rd June 2022, 18:46

Well, I'm embarrassed to admit it but in the interests of full disclosure,
it was an insecure front wheel!
Four of the studs showed a wide shiny area where they had been "fretting".

I just used the hand wrench to tighten the studs on the basis that in the event of a puncture I would have a chance of getting them undone.

However, all tightened to 125 now and I'm keeping the torque wrench in the car.

I'll get me coat!

19th June 2022, 11:32	#1
chicochapman Avid contributor MG ZT-T, 1968 MG Midget Join Date: Feb 2019 Location: Stockport Posts: 106 Thanks: 54 Thanked 21 Times in 19 Posts	New noise from the front. Its a 2002 KV6 ZTT automatic with 116,000 miles on the clock. A new noise from the front has appeared which I can best describe as an irregular muffled clonking sound which only appears on the over-run. Has anybody any thoughts on what it might be ? Thanks, Malc Last edited by chicochapman; 19th June 2022 at 11:42.. Reason: added automatic

19th June 2022, 13:11	#2
SD1too Doesn't do things by halves Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007 Posts: 19,158 Thanks: 1,536 Thanked 3,707 Times in 3,145 Posts	At 116,000 miles has your ancillary belt tensioner ever been renewed? You could also examine your engine mountings. Simon __________________ "Whatever is rightly done, however humble, is noble." Sir Henry Royce.

21st June 2022, 07:45	#4
SD1too Doesn't do things by halves Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007 Posts: 19,158 Thanks: 1,536 Thanked 3,707 Times in 3,145 Posts	Hi Malcolm, It was the ancillary belt tensioner I was asking about! From memory, if you remove the OSF wheel arch liner you can observe it whilst an assistant revs the engine. I once did this on a friend's Saab 9000 and the loss of belt tension was very apparent. Simon __________________ "Whatever is rightly done, however humble, is noble." Sir Henry Royce.

23rd June 2022, 18:46	#6
chicochapman Avid contributor MG ZT-T, 1968 MG Midget Join Date: Feb 2019 Location: Stockport Posts: 106 Thanks: 54 Thanked 21 Times in 19 Posts	Solved Well, I'm embarrassed to admit it but in the interests of full disclosure, it was an insecure front wheel! Four of the studs showed a wide shiny area where they had been "fretting". I just used the hand wrench to tighten the studs on the basis that in the event of a puncture I would have a chance of getting them undone. However, all tightened to 125 now and I'm keeping the torque wrench in the car. I'll get me coat!

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20th June 2022, 20:21	#3
chicochapman Avid contributor MG ZT-T, 1968 MG Midget Join Date: Feb 2019 Location: Stockport Posts: 106 Thanks: 54 Thanked 21 Times in 19 Posts	Thanks Simon. I have an invoice from MG Rover Mobile Mechanics of Derby dated 2015 showing "all cambelts, cambelt tensioners, guiders and waterpump" were replaced at 87,000 miles. On reflection, I think the noise is there all the time - its just more apparent on the over-run when the engine is quieter.(my hearing is not too good !) The lower engine mount was replaced about 2 years ago as I noticed a distinct "clunk" on moving off, however, I'll have a look at the other mountings as you suggest. I'm also thinking of waggling the front wheels to see if its a bearing problem? Thanks, Malc

21st June 2022, 12:43	#5
xsport Posted a thing or two rover 75 club se Join Date: Apr 2011 Location: Leicester Posts: 1,169 Thanks: 348 Thanked 405 Times in 302 Posts	The large bearing housing that transmits the drive shaft to the offside front wheel , have for some members been an issue once they get worn and show signs of play. They can be replaced . You could check that out once you have eliminated the other suggestions first.