Alternator replacement

burly

burly

Senior Member
Fellas, purchased a recently rebuilt converted 12 Volt flathead generator a few years ago that came with what appears to be a stamped steel smooth pulley. I have a cast iron fan mounted (G420) pulley that I'd like to put on this generator and use this set up to replace the G.M. alternator conversion currently on my 1934 Ford with 46 flathead. To my knowledge power Master has yet to offer a fan mounted alternator and does not recommend mounting a fan to their current offerings? Any of you guys attempted a similar application? Thanks guys!
 
There were several different pulleys used. What is the shaft you wish to use, threaded, or keyed ?
 
Powermaster did recently come out with a pulley mounted fan version but it's not cheap. I happen to have the brochure sitting right here next to me. I picked it up at the Grand National Roadster Show back in January. If I remember right, they were over $700.00
 

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Flathead Fever said:
Powermaster did recently come out with a pulley mounted fan version but it's not cheap. I happen to have the brochure sitting right here next to me. I picked it up at the Grand National Roadster Show back in January. If I remember right, they were over $700.00
Click to expand...
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Flathead Fever said:
Powermaster did recently come out with a pulley mounted fan version but it's not cheap. I happen to have the brochure sitting right here next to me. I picked it up at the Grand National Roadster Show back in January. If I remember right, they were over $700.00
Click to expand...

I always get nervous when a company advertises somethng and doesn't give the price.:eek:
 
The shaft is keyed but the stamped steel pulley I pulled off was just screwed on (no key) flush with the armature shaft? I've noticed the cast iron pulley (G420) also threaded leaves enough threads to start a nut on when fully seated. Wow! Over $700? Wonder what a Whitney alternator conversion is going for?
 
$700 - wow!

A properly rebuilt original generator will probably outlast you, and be 1/3 the cost.
 
I read the fan mounted generator pulley (G420) was not produced by Ford? May have an aftermarket part produced to allow the use of latter generator on a earlier fan mounted generator application? Can anyone confirm? Thanks fellas!
 
Burly,
The "G420" pulley is an aftermarket item. It is intended to convert a two brush 40 - 48 generator to a fan drive to replace an earlier three-brush generator. Key difference: the G420 has a threaded bore rather than a keyed bore like a three-brush.
 
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