The Ford Barn

burly · 07-15-2023, 02:19 PM

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!

cas3 · 07-15-2023, 07:07 PM

There were several different pulleys used. What is the shaft you wish to use, threaded, or keyed ?

Flathead Fever · 07-15-2023, 08:22 PM

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

petehoovie · 07-15-2023, 09:14 PM

Quote:

Originally Posted by Flathead Fever

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

tubman · 07-15-2023, 09:40 PM

Quote:

Originally Posted by Flathead Fever

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

I always get nervous when a company advertises somethng and doesn't give the price.

burly · 07-16-2023, 02:59 AM

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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?

ndnchf · 07-16-2023, 05:06 AM

$700 - wow!

A properly rebuilt original generator will probably outlast you, and be 1/3 the cost.

cas3 · 07-16-2023, 09:24 AM

The Whitney was around 500 when I bought mine 5 years ago

Bored&Stroked · 07-16-2023, 10:16 AM

I've had the Whitney product on my 32 for the last 7 or so years - has worked flawlessly.

burly · 07-16-2023, 03:42 PM

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!

blownford · 07-16-2023, 03:45 PM

Bought the Whitney in June this year $490 plus tax

John R · 07-18-2023, 09:40 PM

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.

burly · 07-20-2023, 12:09 PM

Thanks John! Appreciate the info.

burly · 07-20-2023, 04:37 PM

Final question, do these pulleys require a washer and nut?

07-15-2023, 02:19 PM	#1
burly Senior Member Join Date: May 2010 Location: Bowling Green, Ky. Posts: 228	Alternator replacement 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!

07-15-2023, 07:07 PM	#2
cas3 Senior Member Join Date: Jan 2011 Location: sw minnesota Posts: 4,577	Re: Alternator replacement There were several different pulleys used. What is the shaft you wish to use, threaded, or keyed ?

07-16-2023, 02:59 AM	#6
burly Senior Member Join Date: May 2010 Location: Bowling Green, Ky. Posts: 228	Re: Alternator replacement Sponsored Links (Register now to hide all advertisements) 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?

07-16-2023, 05:06 AM	#7
ndnchf Senior Member Join Date: May 2012 Location: Fredericksburg, Virginia Posts: 762	Re: Alternator replacement $700 - wow! A properly rebuilt original generator will probably outlast you, and be 1/3 the cost.

07-16-2023, 09:24 AM	#8
cas3 Senior Member Join Date: Jan 2011 Location: sw minnesota Posts: 4,577	Re: Alternator replacement The Whitney was around 500 when I bought mine 5 years ago

07-16-2023, 10:16 AM	#9
Bored&Stroked Senior Member Join Date: Jan 2011 Location: Central Ohio Posts: 5,068	Re: Alternator replacement I've had the Whitney product on my 32 for the last 7 or so years - has worked flawlessly.

07-16-2023, 03:42 PM	#10
burly Senior Member Join Date: May 2010 Location: Bowling Green, Ky. Posts: 228	Re: Alternator replacement 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!

07-16-2023, 03:45 PM	#11
blownford Junior Member Join Date: Feb 2011 Posts: 25	Re: Alternator replacement Bought the Whitney in June this year $490 plus tax

07-18-2023, 09:40 PM	#12
John R Senior Member Join Date: May 2010 Location: near Washington, DC Posts: 559	Re: Alternator replacement 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. __________________ Those who do not move do not die, but are they not already dead?

07-20-2023, 12:09 PM	#13
burly Senior Member Join Date: May 2010 Location: Bowling Green, Ky. Posts: 228	Re: Alternator replacement Thanks John! Appreciate the info.

07-20-2023, 04:37 PM	#14
burly Senior Member Join Date: May 2010 Location: Bowling Green, Ky. Posts: 228	Re: Alternator replacement Final question, do these pulleys require a washer and nut?