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Home » Public Forums » GMCnet » Learned something about alternators today
Learned something about alternators today [message #221075] Tue, 03 September 2013 19:10 Go to previous message
kerry pinkerton is currently offline  kerry pinkerton   United States
Messages: 2565
Registered: July 2012
Location: Harvest, Al
Karma:
Senior Member
Went by and picked up my alternator from Chap, the old guy who rebuilds them near me. Looked like new. While I was there, he showed me the original pulley and how it was worn from running a too small belt. While I watched, he pulled the old one off and installed a new one. As he was doing it, I noticed there was a small spacer behind the fan.

I asked him if it was possible to add spacers in order to get things in alignment. He said yes and gave me a handful of spacers of various thicknesses.

This photo shows the standard alignment:

http://www.gmcmhphotos.com/photos/data/6256/m_0052.jpg
http://www.gmcmhphotos.com/photos/data/6256/m_0052.jpg

And here are the spacers:

http://www.gmcmhphotos.com/photos/data/6256/m_0063.jpg
http://www.gmcmhphotos.com/photos/data/6256/m_0063.jpg

Because I had to remove the old alternator (purchased last week from Advance), I added spacers to both but installed the one that Chap rebuilt. I'll carry the other as a spare.

http://www.gmcmhphotos.com/photos/data/6256/m_007.jpg
http://www.gmcmhphotos.com/photos/data/6256/m_007.jpg

The belts are perfectly aligned now.

He also told me that if I laid a screwdriver on the back bearing cover while the motor was running, the magnetic field will grab it if the alternator is working and not if it isn't working. This is a neat little trick that I'd never heard before.

Kerry Pinkerton - North Alabama Had 5 over the years. Currently have a '06 Fleetwood Discovery 39L

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