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Re: Re: Re: converting 8n from 6 volts to 12 volts
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Posted by BrettM on December 09, 1998 at 12:38:22:
In Reply to: Re: Re: converting 8n from 6 volts to 12 volts posted by RickN on December 07, 1998 at 13:03:36:
: : : I am trying to convert my 8n to 12 volts. I have found a 12 volt alt. from a Gm. The mounting bracket from an old buick v-8 Fit with a few modafications. My problem is the pulley on the GM. alt. is smaller in width than the pulley on the stock generator. Will this cause a proble with the belt ? Do I need to change the pulley or do I use a different belt? Any help here would be wonderfull. Thank you in advance Jim aka Wilseya. : : : You can e mail me at lybarger@thegrid.net : : : Thanks again and Wilseya : : The V-belt has to fit all pulleys or it will be destroyed and won't work while its being destroyed. You probably can't use the old generator pulley on the alternator because the alternator needs to turn faster and the tractor already runs slower than a car engine. Its a lot easier to change the new alternator's pulley than to change the crankshaft and water pump pulleys. You may have to visit a machine shop and have a custom pulley made to match the width and angle of the ford pulley but the diameter of the standard alternator pulley. You might be able to separate the halves of the alternator pulley with washers, if the shaft is long enough. : : Gerald : When I converted my tractor to an alternator I went to an alternator repair shop and they gave me a smaller pulley from their "junk" pile. They usually have alot of old ones laying around. Good Luck! Jim, I'm a mechanical engineer who has spent a number of years designing belt driven components. A couple of things to note: A) for any given belt size (a combination of belt angle, width, and v-depth) there is a minimum pulley diameter, and B) my starter/generator/alternator rebuilder friend tells me that the GM alternators have a self energizing coil that must turn at 2000 rpms to work properly. However, his opinion is that the 6-volt starter on my 8N would work just fine for a great number of years at 12-volts while turning at a higher rpm. When the temps start dropping, turning faster is always better then turning slower. I have no intention of converting my 8N as my grandfather bought it new in '52, but I am converting my TE-20 Ferguson. The benefits over the course of a year using the machine with 12 volts make it ridiculous to stay 6 volts. Just my 2 cents BrettM
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