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31-08-2017, 07:52
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#1
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Moderator
Join Date: Mar 2009
Location: Denmark (Winter), Cruising North Sea and Baltic (Summer)
Boat: Cutter-Rigged Moody 54
Posts: 35,118
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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?
__________________
"You sea! I resign myself to you also . . . . I guess what you mean,
I behold from the beach your crooked inviting fingers,
I believe you refuse to go back without feeling of me;
We must have a turn together . . . . I undress . . . . hurry me out of sight of the land,
Cushion me soft . . . . rock me in billowy drowse,
Dash me with amorous wet . . . . I can repay you."
Walt Whitman
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31-08-2017, 08:01
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#2
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Registered User
Join Date: Dec 2009
Boat: JBW club 420, MFG Bandit, Snark
Posts: 874
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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
__________________
I love big boats and I can not lie.
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31-08-2017, 08:04
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#3
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Moderator
Join Date: Mar 2009
Location: Denmark (Winter), Cruising North Sea and Baltic (Summer)
Boat: Cutter-Rigged Moody 54
Posts: 35,118
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Re: Removing/Replacing Pulley Nut -- School Bus Alternator
Quote:
Originally Posted by Fiveslide
Impact wrench. Put the new one on with the same impact wrench. Happened to me on a cummins
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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?
__________________
"You sea! I resign myself to you also . . . . I guess what you mean,
I behold from the beach your crooked inviting fingers,
I believe you refuse to go back without feeling of me;
We must have a turn together . . . . I undress . . . . hurry me out of sight of the land,
Cushion me soft . . . . rock me in billowy drowse,
Dash me with amorous wet . . . . I can repay you."
Walt Whitman
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31-08-2017, 08:10
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#4
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Moderator Emeritus
Join Date: Oct 2013
Location: Jacksonville/ out cruising
Boat: Island Packet 38
Posts: 31,348
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Re: Removing/Replacing Pulley Nut -- School Bus Alternator
Leave alt installed with the belt tight
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31-08-2017, 08:12
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#5
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Registered User
Join Date: Sep 2009
Location: Houston
Boat: ‘01 Catana 401
Posts: 9,627
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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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31-08-2017, 08:20
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#6
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Moderator
Join Date: Mar 2009
Location: Denmark (Winter), Cruising North Sea and Baltic (Summer)
Boat: Cutter-Rigged Moody 54
Posts: 35,118
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Re: Removing/Replacing Pulley Nut -- School Bus Alternator
Quote:
Originally Posted by a64pilot
Leave alt installed with the belt tight
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Aha!!!
Too bad we don't have a "light bulb going off over the head" smiley.
Thanks!!!
__________________
"You sea! I resign myself to you also . . . . I guess what you mean,
I behold from the beach your crooked inviting fingers,
I believe you refuse to go back without feeling of me;
We must have a turn together . . . . I undress . . . . hurry me out of sight of the land,
Cushion me soft . . . . rock me in billowy drowse,
Dash me with amorous wet . . . . I can repay you."
Walt Whitman
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31-08-2017, 09:09
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#7
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Registered User
Join Date: Dec 2009
Boat: JBW club 420, MFG Bandit, Snark
Posts: 874
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Re: Removing/Replacing Pulley Nut -- School Bus Alternator
Quote:
Originally Posted by Dockhead
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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I didn't have to lock the shaft. Impact spun the nut off and back on. The belt idea is a good one, too.
__________________
I love big boats and I can not lie.
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31-08-2017, 09:41
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#8
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Registered User
Join Date: Aug 2015
Location: SW Florida
Boat: Grand Banks 49
Posts: 572
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Re: Removing/Replacing Pulley Nut -- School Bus Alternator
Quote:
Originally Posted by a64pilot
Leave alt installed with the belt tight
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===
That's how I do it.
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31-08-2017, 10:04
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#9
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Registered User
Join Date: Jul 2016
Location: Atlantic Highlands, NJ
Boat: Swallowed the anchor
Posts: 988
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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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31-08-2017, 10:20
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#10
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Registered User
Join Date: Feb 2012
Location: Martinique Island French Caribbean
Boat: Cal-40
Posts: 421
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Re: Removing/Replacing Pulley Nut -- School Bus Alternator
Electric impact wrench, works great
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31-08-2017, 10:21
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#11
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Registered User
Join Date: Oct 2014
Location: Bay of Fundy,Grand Manan,N.B.,Canada N44.40 W66.50
Boat: Mascot 28 pilothouse motorsailer 28ft
Posts: 3,641
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Re: Removing/Replacing Pulley Nut -- School Bus Alternator
__________________
 My personal experience & humble opinions-feel free to ignore both
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31-08-2017, 13:05
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#12
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Moderator
Join Date: Mar 2009
Location: Denmark (Winter), Cruising North Sea and Baltic (Summer)
Boat: Cutter-Rigged Moody 54
Posts: 35,118
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Re: Removing/Replacing Pulley Nut -- School Bus Alternator
Quote:
Originally Posted by kenbo
Dockhead,
You have a pneumatic impact wrench on board???
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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?
__________________
"You sea! I resign myself to you also . . . . I guess what you mean,
I behold from the beach your crooked inviting fingers,
I believe you refuse to go back without feeling of me;
We must have a turn together . . . . I undress . . . . hurry me out of sight of the land,
Cushion me soft . . . . rock me in billowy drowse,
Dash me with amorous wet . . . . I can repay you."
Walt Whitman
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31-08-2017, 13:06
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#13
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Moderator
Join Date: Mar 2009
Location: Denmark (Winter), Cruising North Sea and Baltic (Summer)
Boat: Cutter-Rigged Moody 54
Posts: 35,118
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Re: Removing/Replacing Pulley Nut -- School Bus Alternator
Quote:
Originally Posted by deblen
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Thank you!! 
__________________
"You sea! I resign myself to you also . . . . I guess what you mean,
I behold from the beach your crooked inviting fingers,
I believe you refuse to go back without feeling of me;
We must have a turn together . . . . I undress . . . . hurry me out of sight of the land,
Cushion me soft . . . . rock me in billowy drowse,
Dash me with amorous wet . . . . I can repay you."
Walt Whitman
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31-08-2017, 13:20
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#14
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Moderator Emeritus
Join Date: Oct 2013
Location: Jacksonville/ out cruising
Boat: Island Packet 38
Posts: 31,348
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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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31-08-2017, 15:02
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#15
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Registered User
Join Date: Dec 2009
Boat: JBW club 420, MFG Bandit, Snark
Posts: 874
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Re: Removing/Replacing Pulley Nut -- School Bus Alternator
Quote:
Originally Posted by Dockhead
Were people talking about pneumatic ones?
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I was. Hand impact might work, it will certainly take longer.
__________________
I love big boats and I can not lie.
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