It is possible to change them. The Bosch alternators take very common
bearing sizes. Under $5 each if you shop around. I think these are the
ones most 90 amp alternators take. The bigger bearing is at the pulley
end. Be prepared to struggle a bit and have a fallback plan if you fail.

6303-2RS Bearing 17x47x14 Sealed Ball Bearings

6203-2RS Bearing 17x40x12 Sealed Ball Bearing

Mark

Todd Last wrote:
> Is there any cure for this other than replacing the alternator?
> My alternator is not that old and works fine, it just has a screaming
> bearing.
> Talk about horrid noise...
>
> Todd
> '88 Westy
>