XC70: Engine - XC70 D5 growling engine noise

Paul Cretu · Jun 7th, 2021, 20:08

Has anyone ever encountered this noise:
https://youtube.com/shorts/6L34jGMYz9c?feature=share
It’s coming from the alternator/timing belt area. Kind of like a loud growling when revving.

I suspect the alternator bearings. The only other symptom is a whistle at high speeds.

S60D5-185 · Jun 7th, 2021, 20:25

I would take the auxiliary belt off and start the car to see what noise is still present.

If the noise has gone, ideal opportunity to check alternator and air con pulleys as well as tensioners etc.

Paul Cretu · Jun 7th, 2021, 20:32

Thanks, good shout. Didn’t think of taking the belt off.

S60D5-185 · Jun 7th, 2021, 20:33

From memory it's a 60 torx that fits tensioner and it has a BLOODY STRONG SPRING so be careful.

cheshired5 · Jun 7th, 2021, 21:40

If you could get someone to steadily film just the pulley area in good daylight, with the engine running, a bit of light revving then the engine switch off, that would be a help.

Also what mileage? This should be compulsory for any query.
Because the noise stays briefly after engine switch off, my guess is the alternator clutch pulley.

Paul Cretu · Jun 7th, 2021, 21:55

Quote:

Originally Posted by cheshired5

If you could get someone to steadily film just the pulley area in good daylight, with the engine running, a bit of light revving then the engine switch off, that would be a help.

Also what mileage? This should be compulsory for any query.
Because the noise stays briefly after engine switch off, my guess is the alternator clutch pulley.

Thanks cheshired5, I’ll do that tomorrow and update the video. It’s a 2013 D5 awd with 98k miles, full dealer service history. It had the aux belt replaced two services ago, not sure about the tensioner as it was a service plan.

yostumpy · Jun 7th, 2021, 22:21

Sounds a bit like something rubbing the casing, belt is not shredding is it.?

Gazdkw · Jun 8th, 2021, 10:11

Had the same issue. It was a belt vibrating. I changed the belt and all was better

Paul Cretu · Jun 8th, 2021, 20:02

So, did more filming...and investigating.
Seems the noise is coming from inside the alternator.
I was hoping to get away with a new clutch pulley not a whole new alternator

https://youtu.be/R4NOIKOEGAw

https://youtube.com/shorts/kHio9NlkcAc?feature=share

cheshired5 · Jun 8th, 2021, 21:01

The clutch on the pulley seems to be ok as the alternator runs on fine after engine switch off.
Sounds like one or more worn alternator bearings which are cheap and replaceable but not necessarily easy depending on your experience or tool collection.

Odd for such low mileage.

Jun 7th, 2021, 20:08	#1
Paul Cretu New Member Last Online: Jan 14th, 2024 16:40 Join Date: Mar 2017 Location: Colchester	XC70 D5 growling engine noise Has anyone ever encountered this noise: https://youtube.com/shorts/6L34jGMYz9c?feature=share It’s coming from the alternator/timing belt area. Kind of like a loud growling when revving. I suspect the alternator bearings. The only other symptom is a whistle at high speeds.

Jun 7th, 2021, 20:25	#2
S60D5-185 Me ? Surely Not! Last Online: Apr 5th, 2024 16:23 Join Date: Jul 2010 Location: 2007 Volvo XC90 D5 Geartronic. South of Hadrians Wall.	I would take the auxiliary belt off and start the car to see what noise is still present. If the noise has gone, ideal opportunity to check alternator and air con pulleys as well as tensioners etc. __________________ “Do the right thing. It will gratify some people and astonish the rest.” – Mark Twain 😊 2007 Volvo XC90 D5 SE Geartronic

Jun 7th, 2021, 20:33	#4
S60D5-185 Me ? Surely Not! Last Online: Apr 5th, 2024 16:23 Join Date: Jul 2010 Location: 2007 Volvo XC90 D5 Geartronic. South of Hadrians Wall.	From memory it's a 60 torx that fits tensioner and it has a BLOODY STRONG SPRING so be careful. __________________ “Do the right thing. It will gratify some people and astonish the rest.” – Mark Twain 😊 2007 Volvo XC90 D5 SE Geartronic

Jun 7th, 2021, 21:40	#5
cheshired5 Premier Member Last Online: Dec 26th, 2021 13:42 Join Date: Dec 2013 Location: Crewe	If you could get someone to steadily film just the pulley area in good daylight, with the engine running, a bit of light revving then the engine switch off, that would be a help. Also what mileage? This should be compulsory for any query. Because the noise stays briefly after engine switch off, my guess is the alternator clutch pulley. __________________ 2002 S60 SE D5 Manual 209000 miles

Jun 7th, 2021, 22:21	#7
yostumpy Senior Member Last Online: Yesterday 17:22 Join Date: Mar 2021 Location: Gravesend	Sounds a bit like something rubbing the casing, belt is not shredding is it.? __________________

Jun 7th, 2021, 20:32	#3
Paul Cretu New Member Last Online: Jan 14th, 2024 16:40 Join Date: Mar 2017 Location: Colchester	Thanks, good shout. Didn’t think of taking the belt off.

Jun 8th, 2021, 10:11	#8
Gazdkw Master Member Last Online: Apr 23rd, 2024 21:14 Join Date: Apr 2015 Location: Leicester	Had the same issue. It was a belt vibrating. I changed the belt and all was better __________________ 2008 XC70 2.4D SE

Jun 8th, 2021, 20:02	#9
Paul Cretu New Member Last Online: Jan 14th, 2024 16:40 Join Date: Mar 2017 Location: Colchester	So, did more filming...and investigating. Seems the noise is coming from inside the alternator. I was hoping to get away with a new clutch pulley not a whole new alternator https://youtu.be/R4NOIKOEGAw https://youtube.com/shorts/kHio9NlkcAc?feature=share

Jun 8th, 2021, 21:01	#10
cheshired5 Premier Member Last Online: Dec 26th, 2021 13:42 Join Date: Dec 2013 Location: Crewe	The clutch on the pulley seems to be ok as the alternator runs on fine after engine switch off. Sounds like one or more worn alternator bearings which are cheap and replaceable but not necessarily easy depending on your experience or tool collection. Odd for such low mileage. __________________ 2002 S60 SE D5 Manual 209000 miles

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