Intermittent siezing of alternator - and some knocking - Defender Source
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  #1  
Old February 9th, 2013, 07:53 PM
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Intermittent siezing of alternator - and some knocking

Here is a lovely video of my 2.5 NA acting up. The battery light came on today about the same time as I smelled some burning. I pulled over and saw a bit of smoke from the alternator pulley. I got her home and pulled some ancillaries to get to the alternator better and this is what I found:



The pulley seizes when going from rev to idle -- it can be knocked loose and back into rotation with a tap.

I also noticed a knocking, very metallic and inconsistent, that had not been there before that I had noticed. The knocking goes away when the pulley seizes.

Any thoughts? Is this alternator on the way out or is it something smaller? Any thoughts on the knocking? Thanks for looking and for any advice.
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  #2  
Old February 9th, 2013, 08:12 PM
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bearings in alt are seizing... replace alternator . remove the belt and see if the noise is there....
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Old February 9th, 2013, 08:42 PM
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With the belt removed the pulley spins freely. There is 1mm of lateral play, maybe 2mm. No noise.
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Old February 9th, 2013, 08:43 PM
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bearings in alt are seizing... replace alternator . remove the belt and see if the noise is there....
Yup. New alternator time.
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Old February 9th, 2013, 08:48 PM
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Damnit. Thanks ya'll.
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Old February 9th, 2013, 09:00 PM
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anyone got a 45A alternator sitting around they wanna sell? I guess I'm calling RDS monday
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Old February 10th, 2013, 05:39 AM
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Do you have a shop close by that can rebuild?
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Old February 10th, 2013, 09:13 AM
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Quote:
Originally Posted by ontheway View Post
The pulley seizes when going from rev to idle -- it can be knocked loose and back into rotation with a tap.

I also noticed a knocking, very metallic and inconsistent, that had not been there before that I had noticed. The knocking goes away when the pulley seizes.

Any thoughts? Is this alternator on the way out or is it something smaller? Any thoughts on the knocking? Thanks for looking and for any advice.
knocked loose

There's nothing like the right tool for the job - and that's nothing like the right tool

Is this alternator on the way out or is it something smaller?

It's failed.

Drive it like that and the belt will snap

Get one with a higher output - 65 or 100 amps - never want for power again, no more flat battery if you hang big lights on the front.
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Old February 10th, 2013, 09:50 AM
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Is this alternator on the way out or is it something smaller? Any thoughts on the knocking? Thanks for looking and for any advice.
Dave its already gone. Pull it now and you may be able to still get a local place to rebuild it before it completely welds itself together
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