Alternator Bearing Whine?


Information and questions on GL1500 Goldwings (1988-2000)
Post Reply
User avatar
GeoDude
Posts: 9
Joined: Tue Jun 18, 2019 9:45 am
Location: Saskatchewan, Canada
Motorcycle: .
1992 GL1500A Aspencade
1981 GL500I SilverWing

Alternator Bearing Whine?

Post by GeoDude »



Hey,

I've got a '92 with 173,000km (about 108,000 freedom units). Last summer I was investigating a slight knocking that appeared, and am thinking it may be the alternator dampers - still haven't got around to replacing them yet though. Now I've started to notice a bit of a 'whirly' sound, loudest around 1800rpm. As far as I can tell the sound is either coming from the alternator or maybe the cam, but most likely the alternator. I'm running the stock OEM alt, and have no clue how many miles are on it.

I've pulled the alternator today and when spinning the input shaft, it seems pretty smooth but occasionally I'll hear a little chirp. In the case that it's a bearing on its way out, does anyone know if the OEM alternator is rebuildable or serviceable? Or would I better off looking for a replacement?



User avatar
AZgl1800
Posts: 2404
Joined: Thu Oct 30, 2008 2:46 pm
Location: Lake Oologah Indian Territory USA
Motorcycle: '02 GL1800
2009 Piaggio MP3 250cc

Re: Alternator Bearing Whine?

Post by AZgl1800 »

if you have the Alternator out,

change the rubber dampeners and the alternator bearings.

cheap insurance, and you can depend on it for many more Smiles.
~John

'02 GL1800
2009 Piaggio MP3 250cc

User avatar
GeoDude
Posts: 9
Joined: Tue Jun 18, 2019 9:45 am
Location: Saskatchewan, Canada
Motorcycle: .
1992 GL1500A Aspencade
1981 GL500I SilverWing

Re: Alternator Bearing Whine?

Post by GeoDude »

Yeah that's the plan. I've got some on order already as well as a new o-ring. I don't know exactly what new dampers feel like, but mine are pretty rock hard so I'm sure they need to go.

User avatar
ct1500
Posts: 1392
Joined: Wed Nov 10, 2010 8:09 pm
Location: Glastonbury,CT
Motorcycle: 1988 GL1500
Contact:

Re: Alternator Bearing Whine?

Post by ct1500 »

With 108k miles on the clock I would plan on changing the alternator brushes. You need soldering experience for that.
Local and need repair help with your 1500, Valkyrie or ST please click contact
Nothing leaves my shop till its' perfect
This is what I do

User avatar
GeoDude
Posts: 9
Joined: Tue Jun 18, 2019 9:45 am
Location: Saskatchewan, Canada
Motorcycle: .
1992 GL1500A Aspencade
1981 GL500I SilverWing

Re: Alternator Bearing Whine?

Post by GeoDude »

ct1500 wrote:
Wed Jul 15, 2020 3:38 pm
With 108k miles on the clock I would plan on changing the alternator brushes. You need soldering experience for that.
I do have some experience, mostly with smaller stuff on PCBs. I was planning to open the alternator casing and inspect the brushes and bearings but I haven't been able to find much info about it. Mostly just posts like this on various forums.

User avatar
AZgl1800
Posts: 2404
Joined: Thu Oct 30, 2008 2:46 pm
Location: Lake Oologah Indian Territory USA
Motorcycle: '02 GL1800
2009 Piaggio MP3 250cc

Re: Alternator Bearing Whine?

Post by AZgl1800 »

You Tube University has a few helping hands.




   Never miss a video: Subscribe to the GoldwingDocs YouTube channel today!





   Never miss a video: Subscribe to the GoldwingDocs YouTube channel today!





   Never miss a video: Subscribe to the GoldwingDocs YouTube channel today!
~John

'02 GL1800
2009 Piaggio MP3 250cc

fnickel
Posts: 98
Joined: Mon Oct 29, 2012 7:59 pm
Location: Campbellville, ON, Canada
Motorcycle: 1992 GL1500SE

Re: Alternator Bearing Whine?

Post by fnickel »

I may be going against the popular tide here, but I would recommend rebuilding the original unit. When I first got my ‘92 Wing 6 years ago at 80,000 miles, my experienced GW friend told me to get the alternator rebuilt. Good insurance against getting unexpectedly stranded, so that’s what I did the first winter (and timing belts). Took it off myself and gave it to a local mom/pop alternator shop for a rebuild (approx $50); bearings, brushes, seals, etc., and I put in new dampers. Unless you are running a lot of extra electrical goodies, the stock unit is adequate, and you can always change your running lights to LED to lower your demand. Plus, there seems to be a fair number of failures with the higher performance alternators that people have been switching to, if you check the old messages.



Post Reply