 |
Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
|
| View previous topic :: View next topic |
| Author |
Message |
Argonaut36
Joined: 19 May 2019
Posts: 35
|
 Posted: Tue Jul 30, 2019 7:43 pm Post subject: Repeated alternator failure |
 |
|
The alternator in my Lycoming AEIO-360 engine is a Kelly Aerospace ALY 8520 formerly known as ALY 8420. The alternator fails every 80-100 hours. Replacing the brushes and the brush holder (P/N 08-13833) brings back the alternator to work.
The alternator does not fail suddenly. There is a period of time prior to each failure during which the alternator works intermittently, sometimes it is on and sometimes is off. Then it stops working completely.
On the removed brushes there is a black fluid (engine oil plus brush dust?). I don’t know up to what extent this is normal.
Any advice on how to proceed to fix this problem permanently?
Thanks
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
| Back to top |
|
 |
art(at)zemon.name
Guest
|
| Posted: Wed Jul 31, 2019 3:49 am Post subject: Repeated alternator failure |
|
|
Argonaut,
I don't know much about alternators but I have never seen one that needs
(or is supposed to have) any fluid inside, including motor oil. I would
look for, and eliminate, the engine oil leak and see if that preserves your
alternator.
Now I'm going to sit back and see if my guess aligns with what the truly
knowledgeable people suggest.
Cheers,
-- Art Z.
On Tue, Jul 30, 2019 at 10:59 PM Argonaut36 <fmlibrino(at)msn.com> wrote:
[quote]
The alternator in my Lycoming AEIO-360 engine is a Kelly Aerospace ALY
8520 formerly known as ALY 8420. The alternator fails every 80-100 hours
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
| Back to top |
|
|
nuckolls.bob(at)aeroelect
Guest
|
| Posted: Wed Jul 31, 2019 1:07 pm Post subject: Repeated alternator failure |
|
|
At 10:43 PM 7/30/2019, you wrote:
| Quote: | --> AeroElectric-List message posted by: "Argonaut36" <fmlibrino(at)msn.com>
The alternator in my Lycoming AEIO-360 engine is a Kelly Aerospace ALY 8520 formerly known as ALY 8420. The alternator fails every 80-100 hours. Replacing the brushes and the brush holder (P/N 08-13833) brings back the alternator to work.
The alternator does not fail suddenly. There is a period of time prior to each failure during which the alternator works intermittently, sometimes it is on and sometimes is off. Then it stops working completely.
On the removed brushes there is a black fluid (engine oil plus brush dust?). I don’t know up to what extent this is normal.
Any advice on how to proceed to fix this problem permanently?
Thanks
|
I there are no obvious sources of oil
external to the alternator (engine
leaks) then the next best guess i
the rear alternator bearing. These
are normally sealed and factory loaded
with the appropriate grease. If the
seal is leaking, the grease can migrate
out and onto the slip rings.
Bearings come in all manner of pedigree
but verifying seal quality and sometimes
type of grease can be problematic. Next
time you replace brushes, replace the
bearing too . . . and let us know how
it goes.
Bob . . .
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
| Back to top |
|
|
nuckolls.bob(at)aeroelect
Guest
|
| Posted: Wed Jul 31, 2019 7:58 pm Post subject: Repeated alternator failure |
|
|
At 10:43 PM 7/30/2019, you wrote:
| Quote: | --> AeroElectric-List message posted by: "Argonaut36" <fmlibrino(at)msn.com>
The alternator in my Lycoming AEIO-360 engine is a Kelly Aerospace ALY 8520 formerly known as ALY 8420. The alternator fails every 80-100 hours. Replacing the brushes and the brush holder (P/N 08-13833) brings back the alternator to work.
The alternator does not fail suddenly. There is a period of time prior to each failure during which the alternator works intermittently, sometimes it is on and sometimes is off. Then it stops working completely.
On the removed brushes there is a black fluid (engine oil plus brush dust?). I don’t know up to what extent this is normal.
Any advice on how to proceed to fix this problem permanently?
Thanks
|
I there are no obvious sources of oil
external to the alternator (engine
leaks) then the next best guess i
the rear alternator bearing. These
are normally sealed and factory loaded
with the appropriate grease. If the
seal is leaking, the grease can migrate
out and onto the slip rings.
Bearings come in all manner of pedigree
but verifying seal quality and sometimes
type of grease can be problematic. Next
time you replace brushes, replace the
bearing too . . . and let us know how
it goes.
Bob . . .
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
