Plasticky chirping noise - Page 2

robsterpaterson · Nov 21st, 2021, 19:55

Right so the aircon pulley bearing got changed yesterday and...the chirp/rattle is still there!!!
The only belt-related things left unchanged are the aircon compressor and the crank pulley. I'm discounting both of those because the crank pulley is running straight & true with no play and the noise is there regardless of the aircon being on or off so I can't see how it can be the compressor.
I'm now wondering if it's actually the swirl flaps so I'm going to start researching those

ltec · Nov 21st, 2021, 23:42

I thought you said it disappeared with the fan belt off. Can you post a video of the noise? Might help.

robsterpaterson · Nov 22nd, 2021, 07:09

I did, I'm certain it does however I'll take the belt off again and take it to about 2500rpm...

ian ferguson · Nov 22nd, 2021, 20:31

Hi, here is a picture of the head with the cover off after it's been cleaned, ready to fit the new swirl flaps.

Borgi · Nov 23rd, 2021, 19:42

I had a similar noise from the same area on my 2004 D5.
I was told by an independent garage that the alternator pulley has a clutch & that these are known to seize.
I removed the the alternator & had the pulley replaced by an auto electrician & the noise was no longer.
Just a thought.

robsterpaterson · Dec 3rd, 2021, 23:26

Thanks but already changed the pulley with an OE part. No difference. Fitted a refurbed alternator in case it was alternator bearings. No difference.

robsterpaterson · Feb 13th, 2022, 14:41

As a bit of an update, now a few weeks have passed since I tried this, I've maybe cured it by...cleaning the old aux belt

I used the stuff I clean my motorbike chain with (due to rubber o-rings it has) and all seems well. The belt now has zero lateral play and there's no chirping noises either at idle or under load.
I've still to refit the new tensioner and the new belt (once I've cleaned that too) so this isn't 100% a fix. Tell you what though, I'm raging at the loads of hours and £300+ I've thrown at this issue!!!

Ian mallett · Oct 5th, 2023, 22:08

robsterpaterson did you ever get to the bottom of this? I have the chirping belt noise but only hear it when changing up gears under medium to heavy throttle. If I creep about like miss daisy it doesn't do it. If it's a straight forward gear change I will hear it as the revs settle to the new gears lower revs, also noticed when towing or accelerating uphill I hear the chirp for longer( as the revs climb up to gear change under load and then stops after gear change)

Mention in earlier post that it could be swirl flaps?? My arm is connected but feels very sloppy??

Mike A · Oct 6th, 2023, 09:57

I had same noise changed tensioners and belt all-new and genuine volvo no change
I sprayed small amount of water on belt with engine running ...bingo noise gone I replaced with another new volvo belt problem solved..
Just shows that even new belts can be faulty .....So lesson learnt try this before changing everything easy to do and could save you time and money.

Ian mallett · Oct 6th, 2023, 10:00

Quote:

Originally Posted by Mike A

I had same noise changed tensioners and belt all-new and genuine volvo no change
I sprayed small amount of water on belt with engine running ...bingo noise gone I replaced with another new volvo belt problem solved..
Just shows that even new belts can be faulty .....So lesson learnt try this before changing everything easy to do and could save you time and money.

Did yours make the chirp noise all the time or only on gear changes?

Nov 21st, 2021, 19:55	#11
robsterpaterson Member Last Online: Feb 13th, 2023 22:09 Join Date: Aug 2018 Location: Maybole	Right so the aircon pulley bearing got changed yesterday and...the chirp/rattle is still there!!! The only belt-related things left unchanged are the aircon compressor and the crank pulley. I'm discounting both of those because the crank pulley is running straight & true with no play and the noise is there regardless of the aircon being on or off so I can't see how it can be the compressor. I'm now wondering if it's actually the swirl flaps so I'm going to start researching those __________________ '11 XC90 '84 GPz900R '98 T595 Daytona '01 ZX12R

Nov 22nd, 2021, 07:09	#13
robsterpaterson Member Last Online: Feb 13th, 2023 22:09 Join Date: Aug 2018 Location: Maybole	I did, I'm certain it does however I'll take the belt off again and take it to about 2500rpm... __________________ '11 XC90 '84 GPz900R '98 T595 Daytona '01 ZX12R

Dec 3rd, 2021, 23:26	#16
robsterpaterson Member Last Online: Feb 13th, 2023 22:09 Join Date: Aug 2018 Location: Maybole	Thanks but already changed the pulley with an OE part. No difference. Fitted a refurbed alternator in case it was alternator bearings. No difference. __________________ '11 XC90 '84 GPz900R '98 T595 Daytona '01 ZX12R

Feb 13th, 2022, 14:41	#17
robsterpaterson Member Last Online: Feb 13th, 2023 22:09 Join Date: Aug 2018 Location: Maybole	As a bit of an update, now a few weeks have passed since I tried this, I've maybe cured it by...cleaning the old aux belt I used the stuff I clean my motorbike chain with (due to rubber o-rings it has) and all seems well. The belt now has zero lateral play and there's no chirping noises either at idle or under load. I've still to refit the new tensioner and the new belt (once I've cleaned that too) so this isn't 100% a fix. Tell you what though, I'm raging at the loads of hours and £300+ I've thrown at this issue!!! __________________ '11 XC90 '84 GPz900R '98 T595 Daytona '01 ZX12R

Oct 5th, 2023, 22:08	#18
Ian mallett Junior Member Last Online: Oct 11th, 2023 20:54 Join Date: Feb 2018 Location: Swaffham	robsterpaterson did you ever get to the bottom of this? I have the chirping belt noise but only hear it when changing up gears under medium to heavy throttle. If I creep about like miss daisy it doesn't do it. If it's a straight forward gear change I will hear it as the revs settle to the new gears lower revs, also noticed when towing or accelerating uphill I hear the chirp for longer( as the revs climb up to gear change under load and then stops after gear change) Mention in earlier post that it could be swirl flaps?? My arm is connected but feels very sloppy?? __________________ 98 V70 TDI abused daily, survived... snapped cam belt, survived... crashed, survived... crashed again & written off, survived... seized engine, time to part ways... 2010 XC90 D5, R-Design SE 185 (I'm not allowed to abuse this one!)

Nov 21st, 2021, 23:42	#12
ltec Member Last Online: May 27th, 2023 22:47 Join Date: Feb 2015 Location: Northern Ireland	I thought you said it disappeared with the fan belt off. Can you post a video of the noise? Might help.

Nov 23rd, 2021, 19:42	#15
Borgi Junior Member Last Online: Yesterday 10:21 Join Date: Nov 2008 Location: Preston	I had a similar noise from the same area on my 2004 D5. I was told by an independent garage that the alternator pulley has a clutch & that these are known to seize. I removed the the alternator & had the pulley replaced by an auto electrician & the noise was no longer. Just a thought.

Oct 6th, 2023, 09:57	#19
Mike A Member Last Online: Apr 20th, 2024 11:41 Join Date: Apr 2006 Location: Wakefield	I had same noise changed tensioners and belt all-new and genuine volvo no change I sprayed small amount of water on belt with engine running ...bingo noise gone I replaced with another new volvo belt problem solved.. Just shows that even new belts can be faulty .....So lesson learnt try this before changing everything easy to do and could save you time and money.

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