Aux belt area noise...

pphilpot · Jan 27th, 2015, 13:24

Hi all – because of another thread here, I just started the car with the bonnet open and noticed this chirping/cicada/frog noise possibly coming from the alternator. I hate noises coming from around this area, as I cannot tell precisely which component it's coming from.

https://www.youtube.com/watch?v=wSVUM8kEO-s

Is this noise familiar to anybody?

Many thanks in advance.

cheshired5 · Jan 27th, 2015, 13:29

Sounds bearing like but the clip isn't long.
You did your timing belt recently didn't you? and I'm sure I remember you doing the aux setup too.....
Did you change the alternator pulley aswell?

pphilpot · Jan 27th, 2015, 13:34

Yup, cheshired5, I did the cambelt and aux belt plus both tensioners and the aux idler pulley – but didn't touch the alternator. My S40 had the alternator clutch pulley go at about 160,000 and my previous V40 had it go at about 160,000 also, so I assumed that there'd still be plenty of life in it at 79,000 on this S60...

cheshired5 · Jan 27th, 2015, 13:55

Service life of the alternator pulley is 80k

Whip the belt off and turn the pulley clockwise.
Then, insert a screwdriver in the fins of the alternator and turn the pulley clockwise again. If you feel roughness, resistance or it doesn't turn at all, it needs changing.

Brendan W · Jan 27th, 2015, 14:29

Pound to a penny that's the alternator freewheel. Start from cold, your assistant that is, and watch the tensioner pulley. If it jumps about a bit and then settles down and starts cricketing it's a racing certainty the freewheel isn't.
When the motor shuts down the alternator rotor should keep spinning for about a second after the belt stops and as Cheshired5 said the pulley should be free in one direction and locked in the other. A quick wrist flick will do it with the belt off without having to lock anything.
Unfortunately both these tests can be inconclusive as the pulley can enter a Schrodingeresque superposition of states where it is neither free nor not free. Hence the tendancy to flap the belt at cold start and then shake itself free. Comparison with a new unit shows it up pretty quick.
As for life , like you I skipped the alt pulley at timing belt time, 92k but had to replace it at 96k.

chiptivo · Jan 27th, 2015, 20:55

I had everything done in that area apart from the alternator pully.

Mine is the same chirping as that, like a cricket.

It has been that way for two years and does not appear to be getting any worse. I hear it more in the winter.

To change it, I have to get some sort of pully tool?? and then the pully itself (Genuine £75, non volvo £30)

Does anyone in the north wet have the tool and fancy doing this? I don't really want to pay an hours labour for something that takes 5 minutes? + the purchase of the tool I will use once.

pphilpot · Jan 31st, 2015, 11:23

Quote:

Originally Posted by cheshired5

Service life of the alternator pulley is 80k

Whip the belt off and turn the pulley clockwise.
Then, insert a screwdriver in the fins of the alternator and turn the pulley clockwise again. If you feel roughness, resistance or it doesn't turn at all, it needs changing.

Hi cheshired5 – I just tried this and there is only a slight amount of resistance when trying to turn it clockwise. Should it feel the same each way? I would have thought a slight amount of resistance was normal.

[edit] sorry, I should pay more attention to what I'm writing. With a screwdriver jamming the fins, it only spins clockwise with slight resistance, anticlockwise is locked [/edit]

Thanks.

Coventry · Jan 31st, 2015, 14:22

Quote:

Originally Posted by pphilpot

With a screwdriver jamming the fins, it only spins clockwise with slight resistance, anticlockwise is locked

I can't remember the correct way it should spin and lock but that sounds right. I would add though, that despite a clutch pulley appearing to lock and spin correctly in the right direction doesn't mean that it isn't worn. Mine was working apparently prefectly but was still the culprit for a noise/judder at idle.

cheshired5 · Jan 31st, 2015, 17:58

Quote:

Originally Posted by pphilpot

Hi cheshired5 – I just tried this and there is only a slight amount of resistance when trying to turn it clockwise

That can be enough of a sign of early bearing failure.
Your noise symptoms are mild and early but unfortunately no-one is going to put a time on how long you'll get away with it.
When you fit your new pulley, you'll see what I mean by a smooth clutch action.

Jan 27th, 2015, 13:24	#1
pphilpot Premier Member Last Online: Jan 19th, 2024 15:24 Join Date: Oct 2006 Location: Woodbridge, Suffolk	Aux belt area noise... Hi all – because of another thread here, I just started the car with the bonnet open and noticed this chirping/cicada/frog noise possibly coming from the alternator. I hate noises coming from around this area, as I cannot tell precisely which component it's coming from. https://www.youtube.com/watch?v=wSVUM8kEO-s Is this noise familiar to anybody? Many thanks in advance. __________________ ---------------------------------------------------------------------- Current: 2011 C30 1.6 D2 R-Design (155,000) Previous: 2004 S40 1.9D; 2004 S60 D5; 1996 V40 2.0; 1989 740 2.4 T

Jan 27th, 2015, 13:29	#2
cheshired5 Premier Member Last Online: Dec 26th, 2021 13:42 Join Date: Dec 2013 Location: Crewe	Sounds bearing like but the clip isn't long. You did your timing belt recently didn't you? and I'm sure I remember you doing the aux setup too..... Did you change the alternator pulley aswell? __________________ 2002 S60 SE D5 Manual 209000 miles

Jan 27th, 2015, 13:34	#3
pphilpot Premier Member Last Online: Jan 19th, 2024 15:24 Join Date: Oct 2006 Location: Woodbridge, Suffolk	Yup, cheshired5, I did the cambelt and aux belt plus both tensioners and the aux idler pulley – but didn't touch the alternator. My S40 had the alternator clutch pulley go at about 160,000 and my previous V40 had it go at about 160,000 also, so I assumed that there'd still be plenty of life in it at 79,000 on this S60... __________________ ---------------------------------------------------------------------- Current: 2011 C30 1.6 D2 R-Design (155,000) Previous: 2004 S40 1.9D; 2004 S60 D5; 1996 V40 2.0; 1989 740 2.4 T

Jan 27th, 2015, 13:55	#4
cheshired5 Premier Member Last Online: Dec 26th, 2021 13:42 Join Date: Dec 2013 Location: Crewe	Service life of the alternator pulley is 80k Whip the belt off and turn the pulley clockwise. Then, insert a screwdriver in the fins of the alternator and turn the pulley clockwise again. If you feel roughness, resistance or it doesn't turn at all, it needs changing. __________________ 2002 S60 SE D5 Manual 209000 miles

Jan 27th, 2015, 14:29	#5
Brendan W Premier Member Last Online: Apr 2nd, 2024 19:50 Join Date: Dec 2007 Location: Wexford	Pound to a penny that's the alternator freewheel. Start from cold, your assistant that is, and watch the tensioner pulley. If it jumps about a bit and then settles down and starts cricketing it's a racing certainty the freewheel isn't. When the motor shuts down the alternator rotor should keep spinning for about a second after the belt stops and as Cheshired5 said the pulley should be free in one direction and locked in the other. A quick wrist flick will do it with the belt off without having to lock anything. Unfortunately both these tests can be inconclusive as the pulley can enter a Schrodingeresque superposition of states where it is neither free nor not free. Hence the tendancy to flap the belt at cold start and then shake itself free. Comparison with a new unit shows it up pretty quick. As for life , like you I skipped the alt pulley at timing belt time, 92k but had to replace it at 96k. Last edited by Brendan W; Jan 27th, 2015 at 14:35.

Jan 27th, 2015, 20:55	#6
chiptivo Premier Member Last Online: Jan 17th, 2022 13:13 Join Date: Apr 2010 Location: wirral	I had everything done in that area apart from the alternator pully. Mine is the same chirping as that, like a cricket. It has been that way for two years and does not appear to be getting any worse. I hear it more in the winter. To change it, I have to get some sort of pully tool?? and then the pully itself (Genuine £75, non volvo £30) Does anyone in the north wet have the tool and fancy doing this? I don't really want to pay an hours labour for something that takes 5 minutes? + the purchase of the tool I will use once.

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