Chirping noise at high revs

12345 · Jan 29th, 2016, 18:49

Hi

On my diesel Xc90 2007 I noticed today that when I accelerate hard, there's a chirping (about 4 chirps) noise before the Rev needle hits the red line and the gearbox changes gear.
This happens in 1st,2nd and 3rd gear. Not sure about the other gears as I don't drive that hard !

All the belts were changed by Volvo 20,000 miles ago and the noise has never happened previously.

I was wondering if it's the alternator pulley or the turbo ?

Otherwise the engines running fine and fuel economy has stayed the same.

Thanks

cheshired5 · Jan 29th, 2016, 19:08

What's your mileage?

12345 · Jan 29th, 2016, 19:08

107,000

cheshired5 · Jan 29th, 2016, 19:26

Alternator pulleys have a nominal service life of 80k but tend to last considerably longer. My original failed around 165k but failure rates seem to vary from 120k+
Whip the aux belt off and if the noise goes, it's a pulley issue.

With the belt off, the way to test a clutch pulley is to insert a screwdriver through one of the holes in the alternator to stop the fins.
Try to turn the pulley by hand COUNTER clockwise. You shouldn't be able to move it.
If you can move it counter clockwise, you need a new pulley.

With the screwdriver still inserted, now try to turn the pulley by hand CLOCKWISE and it should turn smoothly.
If it turns ok clockwise, your clutch is fine.
If it won't turn or if it is rough, you need a new clutch pulley.

Ade2015 · Aug 14th, 2017, 21:14

Could someone give an indication how freely the OAP should turn in the freewheel direction? Mine locks as expected in the drive direction but it takes a screwdriver jammed in the fins and 'firm finger pressure' to get it to rotate in the freewheel direction - although it feels smooth.
Is this right, or should it freewheel easily?

cheshired5 · Aug 15th, 2017, 01:11

Quote:

Originally Posted by Ade2015

Could someone give an indication how freely the OAP should turn in the freewheel direction? Mine locks as expected in the drive direction but it takes a screwdriver jammed in the fins and 'firm finger pressure' to get it to rotate in the freewheel direction - although it feels smooth.
Is this right, or should it freewheel easily?

https://youtu.be/qJee0aSERoo

Jan 29th, 2016, 18:49	#1
12345 Member Last Online: Apr 23rd, 2021 13:55 Join Date: Sep 2011 Location: beds	Chirping noise at high revs Hi On my diesel Xc90 2007 I noticed today that when I accelerate hard, there's a chirping (about 4 chirps) noise before the Rev needle hits the red line and the gearbox changes gear. This happens in 1st,2nd and 3rd gear. Not sure about the other gears as I don't drive that hard ! All the belts were changed by Volvo 20,000 miles ago and the noise has never happened previously. I was wondering if it's the alternator pulley or the turbo ? Otherwise the engines running fine and fuel economy has stayed the same. Thanks __________________ 2008 XC90 185 Executive Auto Last edited by 12345; Jan 29th, 2016 at 19:07.

Jan 29th, 2016, 19:08	#2
cheshired5 Premier Member Last Online: Dec 26th, 2021 13:42 Join Date: Dec 2013 Location: Crewe	What's your mileage? __________________ 2002 S60 SE D5 Manual 209000 miles

Jan 29th, 2016, 19:08	#3
12345 Member Last Online: Apr 23rd, 2021 13:55 Join Date: Sep 2011 Location: beds	107,000 __________________ 2008 XC90 185 Executive Auto

Jan 29th, 2016, 19:26	#4
cheshired5 Premier Member Last Online: Dec 26th, 2021 13:42 Join Date: Dec 2013 Location: Crewe	Alternator pulleys have a nominal service life of 80k but tend to last considerably longer. My original failed around 165k but failure rates seem to vary from 120k+ Whip the aux belt off and if the noise goes, it's a pulley issue. With the belt off, the way to test a clutch pulley is to insert a screwdriver through one of the holes in the alternator to stop the fins. Try to turn the pulley by hand COUNTER clockwise. You shouldn't be able to move it. If you can move it counter clockwise, you need a new pulley. With the screwdriver still inserted, now try to turn the pulley by hand CLOCKWISE and it should turn smoothly. If it turns ok clockwise, your clutch is fine. If it won't turn or if it is rough, you need a new clutch pulley. __________________ 2002 S60 SE D5 Manual 209000 miles

Aug 14th, 2017, 21:14	#5
Ade2015 Junior Member Last Online: Apr 6th, 2024 10:57 Join Date: Jun 2015 Location: Leeds	Could someone give an indication how freely the OAP should turn in the freewheel direction? Mine locks as expected in the drive direction but it takes a screwdriver jammed in the fins and 'firm finger pressure' to get it to rotate in the freewheel direction - although it feels smooth. Is this right, or should it freewheel easily?

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