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Can't find alternator pulley for my car.... #4464843
07/20/17 11:58 AM
07/20/17 11:58 AM
Joined: Jan 2017
Posts: 420
Virginia
Hemispheres Offline OP
Hemispheres  Offline OP
Joined: Jan 2017
Posts: 420
Virginia
I've got a rattle coming from the alternator pulley on my vehicle. 2009 Lacrosse with the Series III 3800.

If possible I'd rather replace the pulley instead of the whole alternator, I don't see any need to drop $125 on a whole new alternator when it still operates just fine.

Here's the only info I can find on the pulley. http://www.rockauto.com/en/moreinfo.php?pk=3572820&cc=1442771&jsn=248

I'll accept a junkyard part, just don't see how I'd be able to remove the pulley without an electric or air powered impact.

Last edited by Hemispheres; 07/20/17 11:58 AM.

2009 Buick LaCrosse (3800 Series III) - 137,000 miles.
PZ Plat HM/Mobil 1 HM
Bosch/Purolator/Mobil filters
Re: Can't find alternator pulley for my car.... [Re: Hemispheres] #4464848
07/20/17 12:03 PM
07/20/17 12:03 PM
Joined: Dec 2008
Posts: 3,080
Occupied Virginia
Bottom_Feeder Offline
Bottom_Feeder  Offline
Joined: Dec 2008
Posts: 3,080
Occupied Virginia
Without a more mechanically complicated decoupler pulley (that your car's alternator apparently does NOT have), how/why would a regular solid belt pulley make a rattling noise beyond coming loose? It's not a wear item or something prone to going bad.

Re: Can't find alternator pulley for my car.... [Re: Bottom_Feeder] #4464851
07/20/17 12:05 PM
07/20/17 12:05 PM
Joined: Jan 2017
Posts: 420
Virginia
Hemispheres Offline OP
Hemispheres  Offline OP
Joined: Jan 2017
Posts: 420
Virginia
Most likely because I've been beating the [censored] out of it recently.....

I replaced the battery in March when the rattle first started occurring, I had both battery and alternator tested and the alt checked out.

Last edited by Hemispheres; 07/20/17 12:12 PM.

2009 Buick LaCrosse (3800 Series III) - 137,000 miles.
PZ Plat HM/Mobil 1 HM
Bosch/Purolator/Mobil filters
Re: Can't find alternator pulley for my car.... [Re: Hemispheres] #4464854
07/20/17 12:10 PM
07/20/17 12:10 PM
Joined: Dec 2008
Posts: 3,080
Occupied Virginia
Bottom_Feeder Offline
Bottom_Feeder  Offline
Joined: Dec 2008
Posts: 3,080
Occupied Virginia
The car with your right foot, or the alternator with a hammer?

Re: Can't find alternator pulley for my car.... [Re: Hemispheres] #4464860
07/20/17 12:15 PM
07/20/17 12:15 PM
Joined: Jan 2017
Posts: 420
Virginia
Hemispheres Offline OP
Hemispheres  Offline OP
Joined: Jan 2017
Posts: 420
Virginia
Car with the right foot. Driving like an idiot. I edited my last post for more detail. Rattle has been present for 4.5 months and the alternator checks out. Also probably doesn't help that I've been driving around on a busted motor mount.


2009 Buick LaCrosse (3800 Series III) - 137,000 miles.
PZ Plat HM/Mobil 1 HM
Bosch/Purolator/Mobil filters
Re: Can't find alternator pulley for my car.... [Re: Hemispheres] #4464861
07/20/17 12:16 PM
07/20/17 12:16 PM
Joined: Sep 2007
Posts: 968
TX, USA
JMJNet Offline
JMJNet  Offline
Joined: Sep 2007
Posts: 968
TX, USA
There are a couple of alternator/starter part website that sells alternator pulley.
If all else fail, check ebay.
You need to know the diameter of the pulley plus no. of groove.

You CANNOT search by the alternator for your model car since you are looking for parts of the alternator.

I am not sure if the pulley alone will cost you more than the alternator itself or not much more if you buy a complete alternator.

Another way is to buy a used good one from JY.

Last edited by JMJNet; 07/20/17 12:18 PM.

  • 2017 Toyota Sienna
  • 1995 GMC Suburban 6.5L Turbo Diesel


Re: Can't find alternator pulley for my car.... [Re: Hemispheres] #4464866
07/20/17 12:20 PM
07/20/17 12:20 PM
Joined: Jan 2017
Posts: 420
Virginia
Hemispheres Offline OP
Hemispheres  Offline OP
Joined: Jan 2017
Posts: 420
Virginia
Pulley OD = 62 mm

Serpentine belt = 90.5" long by .82" wide with six ribs


2009 Buick LaCrosse (3800 Series III) - 137,000 miles.
PZ Plat HM/Mobil 1 HM
Bosch/Purolator/Mobil filters
Re: Can't find alternator pulley for my car.... [Re: Hemispheres] #4464891
07/20/17 12:31 PM
07/20/17 12:31 PM
Joined: Dec 2016
Posts: 6,238
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,238
Waco, TX
Any alternator rebuild shop can help.

I have had good luck with eBay alternator pullies.

Yes, an impact is needed to change it.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Can't find alternator pulley for my car.... [Re: Hemispheres] #4464896
07/20/17 12:36 PM
07/20/17 12:36 PM
Joined: Nov 2006
Posts: 19,920
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 19,920
MA, Mittelfranken.de
I cant think of how a solid pulley would rattle unless its loose on the shaft. I would suspect a bearing going bad more than the pulley.


ASE L1, Master. Deutsch Meisterbrief.
Re: Can't find alternator pulley for my car.... [Re: Hemispheres] #4464905
07/20/17 12:40 PM
07/20/17 12:40 PM
Joined: Jan 2017
Posts: 420
Virginia
Hemispheres Offline OP
Hemispheres  Offline OP
Joined: Jan 2017
Posts: 420
Virginia
I've got no squealing or screeching noises. It's specifically a metallic rattle coming from the top of the engine/alternator pulley.


2009 Buick LaCrosse (3800 Series III) - 137,000 miles.
PZ Plat HM/Mobil 1 HM
Bosch/Purolator/Mobil filters
Re: Can't find alternator pulley for my car.... [Re: Trav] #4464909
07/20/17 12:43 PM
07/20/17 12:43 PM
Joined: Dec 2008
Posts: 3,080
Occupied Virginia
Bottom_Feeder Offline
Bottom_Feeder  Offline
Joined: Dec 2008
Posts: 3,080
Occupied Virginia
Originally Posted By: Trav
I cant think of how a solid pulley would rattle unless its loose on the shaft. I would suspect a bearing going bad more than the pulley.

This. ^

Or a belt idler pulley being the real culprit. Or the belt tensioner. Or the water pump. Etc.

Have you actually removed the belt and poked around to determine for sure it's the alternator? I just can't see how a sold pulley goes bad or how a rattling/loose pulley would be the pulley's fault.

Re: Can't find alternator pulley for my car.... [Re: Hemispheres] #4464924
07/20/17 12:51 PM
07/20/17 12:51 PM
Joined: Jun 2003
Posts: 5,921
Illinois
SHOZ Offline
SHOZ  Offline
Joined: Jun 2003
Posts: 5,921
Illinois
Take the belt off and start the car to let it run for a few seconds, see if the noise is still there.

And you can turn the pulley by hand to feel for a bad bearing or movement. Solid, one piece pulleys don't go bad.

I thought my PS pump was going bad, turned out to be the AC clutch bearing. But until I removed the PS pump belt I could not tell.


2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual
Re: Can't find alternator pulley for my car.... [Re: Hemispheres] #4464935
07/20/17 12:57 PM
07/20/17 12:57 PM
Joined: Jan 2017
Posts: 420
Virginia
Hemispheres Offline OP
Hemispheres  Offline OP
Joined: Jan 2017
Posts: 420
Virginia
Just fired her up, no rattle but I did hear a squeaking from the a.c. compressor that went away after about a minute. Tensioner has slight movement but is in sync with the back and forth movement of the engine due to the bad motor mount.

Ill have to replace the mount and go from there.


2009 Buick LaCrosse (3800 Series III) - 137,000 miles.
PZ Plat HM/Mobil 1 HM
Bosch/Purolator/Mobil filters
Re: Can't find alternator pulley for my car.... [Re: Hemispheres] #4465044
07/20/17 02:46 PM
07/20/17 02:46 PM
Joined: Apr 2017
Posts: 1,480
Ontario, Canada
mightymousetech Offline
mightymousetech  Offline
Joined: Apr 2017
Posts: 1,480
Ontario, Canada
If it is a solid pulley, it is not the pulley making the noise.


Mighty Mouse Tech
BMW Tech, Former Acura Tech
2010 Civic Si Castrol 0W40, Redline MTL
2013 BMW 135i M Sport Edition Castrol 0W40, Redline MTL
Re: Can't find alternator pulley for my car.... [Re: Trav] #4465138
07/20/17 04:12 PM
07/20/17 04:12 PM
Joined: Dec 2016
Posts: 6,238
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,238
Waco, TX
Originally Posted By: Trav
I cant think of how a solid pulley would rattle unless its loose on the shaft. I would suspect a bearing going bad more than the pulley.


I'm responding to this thread believing he has an "overrunning clutch" alternator pulley.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
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