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Old 31-08-2017, 06:52   #1
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Removing/Replacing Pulley Nut -- School Bus Alternator

What I thought was bad bearings on my alternator turns out to be a loose pulley nut, which allowed the fan to meet the housing, destroying the fan. Otherwise the alternator seems to be fine. So could be that all I need is an $8 fan.

But I can't figure out how to get the pulley nut off. The shaft can't be locked from the other side as it doesn't even stick out.

Anybody know how it's done?
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Old 31-08-2017, 07:01   #2
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Re: Removing/Replacing Pulley Nut -- School Bus Alternator

Impact wrench, don't try to lock the shaft, that should spin it off. Put the new one on with the same impact wrench. Happened to me on a cummins
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Old 31-08-2017, 07:04   #3
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Re: Removing/Replacing Pulley Nut -- School Bus Alternator

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Originally Posted by Fiveslide View Post
Impact wrench. Put the new one on with the same impact wrench. Happened to me on a cummins
Thanks. And I do have an impact wrench on board. And how to get the old one off? Is there any way to hold the rotor shaft?
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Old 31-08-2017, 07:10   #4
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Re: Removing/Replacing Pulley Nut -- School Bus Alternator

Leave alt installed with the belt tight
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Old 31-08-2017, 07:12   #5
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Re: Removing/Replacing Pulley Nut -- School Bus Alternator

Is there an Allen socket cut into the shaft? I've run across this a few times where I needed to weld a pass through handle onto a socket so I could turn the nut while holding the shaft with an Allen wrench
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Old 31-08-2017, 07:20   #6
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Re: Removing/Replacing Pulley Nut -- School Bus Alternator

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Originally Posted by a64pilot View Post
Leave alt installed with the belt tight
Aha!!!

Too bad we don't have a "light bulb going off over the head" smiley.

Thanks!!!
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Old 31-08-2017, 08:09   #7
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Re: Removing/Replacing Pulley Nut -- School Bus Alternator

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Thanks. And I do have an impact wrench on board. And how to get the old one off? Is there any way to hold the rotor shaft?
I didn't have to lock the shaft. Impact spun the nut off and back on. The belt idea is a good one, too.
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Old 31-08-2017, 08:41   #8
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Re: Removing/Replacing Pulley Nut -- School Bus Alternator

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Leave alt installed with the belt tight
===

That's how I do it.
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Old 31-08-2017, 09:04   #9
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Re: Removing/Replacing Pulley Nut -- School Bus Alternator

Dockhead,

You have a pneumatic impact wrench on board???
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Old 31-08-2017, 09:20   #10
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Re: Removing/Replacing Pulley Nut -- School Bus Alternator

Electric impact wrench, works great
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Old 31-08-2017, 09:21   #11
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Re: Removing/Replacing Pulley Nut -- School Bus Alternator

https://www.harborfreight.com/12-in-...nch-68099.html

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Old 31-08-2017, 12:05   #12
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Re: Removing/Replacing Pulley Nut -- School Bus Alternator

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Dockhead,

You have a pneumatic impact wrench on board???
Ha, ha. No. I have almost everything else, though, including a drill press

I have a HAND impact wrench. Were people talking about pneumatic ones?
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Old 31-08-2017, 12:06   #13
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Re: Removing/Replacing Pulley Nut -- School Bus Alternator

Thank you!!
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Old 31-08-2017, 12:20   #14
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Re: Removing/Replacing Pulley Nut -- School Bus Alternator

Pneumatics are in my opinion much better, and inexpensive.
If you have a compressor for a Hooka, why not pneumatic tools?
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Old 31-08-2017, 14:02   #15
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Re: Removing/Replacing Pulley Nut -- School Bus Alternator

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Were people talking about pneumatic ones?
I was. Hand impact might work, it will certainly take longer.
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