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Show Parts for Model:

Alternator Belt

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Jeff Hamilton

06-23-2014 11:27:07

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New to me 8N, side mount distributor. After about 2 hours running started squealing (belt) at higher engine speed. Slowly raising the speed kept it manageable but finally got too bad. Tractor is converted to 12V, Delco alternator. I observed that the alternator pulley was not in the same plane as the crank and fan, it was also cocked a little sideways – so I decided I needed to correct the problem. Removed alternator, hammered brackets back square (homemade), re-installed with the belt nicely lined up and tight. Still squealed (worse!). Found my old can of “Cling Surface” belt dressing and applied to the sides of the V-belt – no improvement. FINALLY – realized that the pulleys on the fan and crank were made for a wider belt and the pulley on the alternator was ½” wide. The belt was also ½” and the inside belt surface was trying to do the driving (as opposed to the sides like they are designed). I applied the belt dressing to the inside surface of the belt and the squeal stopped. QUESTION: I think I should have a wider belt; can I get a new pulley for the alternator? What do other owners do?

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06-24-2014 07:57:03

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 Re: Alternator Belt in reply to Jeff Hamilton, 06-23-2014 11:27:07

Part # 98-NAA5825....

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Pete in Holland MI

06-23-2014 20:49:01

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 Re: Alternator Belt in reply to Jeff Hamilton, 06-23-2014 11:27:07  
V-belts get their grip by expanding as they flex around a pulley into the pulley sides. A too wide pulley or too small of belt width causes the belt to ride at the bottom of the pulley, losing much traction.


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Charles Krammin

06-23-2014 15:57:24

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 Re: Alternator Belt in reply to Jeff Hamilton, 06-23-2014 11:27:07  
They may sell 1/2 wide (recessed for nut) at this site. I went to "electric motor service, bought the smallest in diameter for faster speed. that fit the alternator pulley. I then went to my favorite private machine shop with the alternator, and said "recesses it so I can get the nut on with a socket" Machine shop time and fixed.
BTDT Charles Krammin SW MI

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Ultradog MN

06-23-2014 11:49:35

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 Re: Alternator Belt in reply to Jeff Hamilton, 06-23-2014 11:27:07  
I just went through tht on a conversion here.
Bought the alternator from Napa but it had a 7/16" pully. I needed one for a half inch.
They ordered a 1/2" pulley for me. I think it was about $10.
Bring your alternator along and they should be able to fix you up.
Another way, if you have access to a lathe is to cut your 1/2" pulley wider.

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06-23-2014 11:47:37

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 Re: Alternator Belt in reply to Jeff Hamilton, 06-23-2014 11:27:07  
yes.. you can get a wider pulley

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