Generator pulley 59 for a fan bolt om
 

I has a the older 6V generator ( round cut off regulator ) and a pulley that one can bolt a fan to.
I will replace the generator to the never 40’s style 6V and separate regulator. The one I bougt has a pulley with no bolt holes to a fan ( se pic )
I saw one engine that had the never generator but a pulley with boltholes for a fan ( se pic )
But axle diameter is not the same so how is this done.

Re: Generator pulley 59 for a fan bolt om
 

There are lots of pulleys. you need to find the one for your gennie. 1st, what is your shaft, what size, and got a key way? Figger out what you need then look at ebay for the correct shaft size with a fan mount. Also, lots of different pulley diameters. what speed would you like to run your fan?

Re: Generator pulley 59 for a fan bolt om
 

I think you are looking for a '39 standard generator and pulley. Check the Green Bible and see what else it fits.

Charlie Stephens

Re: Generator pulley 59 for a fan bolt om
 

His pics are so small but it appears he has a 40-48 gen.Those 2 brush 39 std gen are tough to find.

Re: Generator pulley 59 for a fan bolt om
 

Charlie NY or anyone with a lathe can cut internal threads in an earlier pulley so it can thread on to the later thread shaft. As mentioned, the '39 standard pulley is a tough one to source.

Re: Generator pulley 59 for a fan bolt om
 

If you put a threaded pulley on, better have a lock nut in front! They can unravel and send a fan into your rad.

Re: Generator pulley 59 for a fan bolt om
 

Good point, Jim. 100% accurate. On my maiden voyage with my roadster, after about 30 minutes of driving I was hearing this ting, ting, ting sound from the front as I revved.

I pull over to check it out and the pulley did just that. I did not have a nut on it at the time. Thank goodness no damage other than paint loss.

Re: Generator pulley 59 for a fan bolt om
 

I may be out of my depth here, but isn't there a difference in the front bearings in pre-war generators depending on whether they were fan mounts or not? I seem to remember reports of problems with fans mounted on generators not specifically designed for them. I may be all wet, but if it were me,I'd like to be sure.

Re: Generator pulley 59 for a fan bolt om
 

I can click on my picture and they large and one could zoom to.

The pulley on my 40’s generator has maybe 1.5 thread out side so no nut was ever there.
My 30’s generator has a nut.
Se picture.
But how to remove the pulley, nowhere to wrench it (?)

Re: Generator pulley 59 for a fan bolt om
 

About those '39 std/commercial generators. I HAD an old shop local source for them. Went in to visit, asked about buying them all, and was told I missed by one week, the shop sent 8- 55gal barrels of generators to scrap!! Sold the property and retiring. Apparently there is an aftermarket alternator [12V] available, fan mounted type. Newc

Re: Generator pulley 59 for a fan bolt om
 

I did find a NOS military generator (still in the wooden crate) that has the fan mounted pulley that screws on at Hershey for $30. It's a two belt pulley, but that doesn't matter to me.

Re: Generator pulley 59 for a fan bolt om
 

To remove pulley, first remove the armature, front bearing plate and pulley as a unit. Then clamp the armature in a padded vice. Remove the small C-clip on the end of the shaft. Then unscrew the pulley, use a strap wrench if it is tight. It is a left hand thread.

Re: Generator pulley 59 for a fan bolt om
 

It was no C-clip in front but I could remove the pulley.
It's cleaned up now in my tank.
I might can modify the older generators pulley that has bots to fan.
If I not will use the std set-up on generator I might not need do this ( I has sevaral solutions ) but my pulley was hurted, so who has the 40's style pulleys ?

Re: Generator pulley 59 for a fan bolt om
 

The 3 brush pulley is a little thin to bore out to the larger shaft size on one side.

Re: Generator pulley 59 for a fan bolt om
 

Yes, that was my idea to look at this, but what pulley did the 40’s generator had on the Chris Unger cool 3W coupe has ? ( se pic )

Re: Generator pulley 59 for a fan bolt om
 

Do not bore out the early pulley for use on the later armature (12 volt). Not enough meat there to last. Ask me how I know.

Re: Generator pulley 59 for a fan bolt om
 

I keep looking at the flea markets there are 2 different diameters — the real generator has the ears for the mounting that look the same as the 3 brush generator.
The green book has listings with pictures.Educate yourself and go looking in the 1$ piles

Re: Generator pulley 59 for a fan bolt om
 

I will try find a std pulley to this ca 1942 generator, its said 21 A.

Re: Generator pulley 59 for a fan bolt om
 

I think you are looking for one like this. A few days ago I picked up 30+ generators at auction. This rare bird was among them. It appears to be post-1940 by the two side terminals and B stamp next to the field terminal. I'm working feverishly to get ready for Hershey. I hope to have this one restored in time to display on my table.

Re: Generator pulley 59 for a fan bolt om
 

Chief, you are a lucky man. I found a similar pulley on a rather large generator with a 40-esque front mount. I assumed it came from a fire truck or ambulance.

Re: Generator pulley 59 for a fan bolt om
 

That is the 39 Standard IMO.Had a couple over the yrs and had Whitney in Fullerton CA do the 12V conversion on them .

Re: Generator pulley 59 for a fan bolt om
 

Good info.

Re: Generator pulley 59 for a fan bolt om
 

It turns out that generator I showed a few days ago was a mix of parts, not a true '39 standard/pickup generator. It was not functional as it was. But I restored it into a fully functional, 2-brush with pulley mounted fan - very similar to the rare '39 standard generator. This uses the extra large bearing to carry the fan load, not the standard 2-brush bearing. I just had it running on the test bench this morning, putting out over 30 amps :-)

I'll be bringing it to Hershey in less than 2 weeks. It will be for sale on my table along with other restored generators. If you are there, stop by and say hi. South chocolate CJ 71-73.
Steve

Re: Generator pulley 59 for a fan bolt om
 

I mentioned this early on in this thread, and nobody seemed to pay any attention; i would seem to be important, given the purpose of this thread.

Re: Generator pulley 59 for a fan bolt om
 

It does seem like an upgrade, but thousands of the early ones with fan mounts were run with the Timken-style bearing and you generally don't hear of failures.

While rebuilding or looking for a replacement, any way to improve these old systems would seem to be a benefit.

Re: Generator pulley 59 for a fan bolt om
 

Running an electric fan, would solve allot of problems and be better for the engine. Nobosy uses them anymore.
Gramps

Re: Generator pulley 59 for a fan bolt om
 

Don’t say nobody. There are a lot of us that do. I would rather walk than use an ugly electric fan.

Re: Generator pulley 59 for a fan bolt om
 

I agree to that.
But Ol' Ron is not wrong.
It's 2024 now.
I will try find a std 42 pulley, as I has a new idea on fan.

Re: Generator pulley 59 for a fan bolt om
 

It’s not 2024 here. We are driving home from a swap meet with a truckload of 1932.

Re: Generator pulley 59 for a fan bolt om
 

Its 2024 nomatter, but no electric fan for me.

Question.
So the pulley is from a older one whit now bigger holes made, or ?

Re: Generator pulley 59 for a fan bolt om
 

Do tell what the "larger front bearing was used". The .590 shaft from 32-36 use two tapered roller bearings for fan use and needed lubrication. I couldn't find a tapered roller used in pairs for the later, larger .669 diameter shaft. I took apart my '41 generator, and removed the single roller bearing. The pocket size to work with is 40mmx 14mm, shaft size 17mm. I have this one coming, should fit right in, whether I use a fan or not, its good for radial loads from the belt.
LR5003NPPU Track Roller Double Row Bearing 17x40x14 Sealed Track Bearings VXB Brand

Re: Generator pulley 59 for a fan bolt om
 

In the 1938-1939 period (and a few other specialty generators) they went to what I call the big bearing, a 6303-2RS Ball Bearing 17mm x47mm x14mm. Apparently Ford engineers determined that this bearing could handle radial belt loads and axial fan thrust loads. It was much simpler and less costly than the multi-part tapered roller bearings package used in 1932-1937 generators. After generator pulley mounted fans were discontinued, they reverted back to a smaller 6203 bearing as used in model A tube generators.

As side note - In 1932-1937 generators I use a 5202-2RS double row angular contact bearing with custom machined inner and outer race spacer rings to make up the stack height difference. These modern sealed bearings are designed to take both radial and axial loads.

Re: Generator pulley 59 for a fan bolt om
 

Ok, so there's the difference in the 38-39 front mount, they used a 47mm OD, and in '40
forward, they used the 40mm like mine. Thanks for the detailed post.

Re: Generator pulley 59 for a fan bolt om
 

I've tried to follow, but what am I missing? Early generators that had the fan on the front used two small, Timken-style bearings and millions were made this way and used successfully in cars.

The move to removing the fan from the generator and then Ford went to using a sealed bearing in the two brush generators.

So I understand, the two brush style can't handle a fan without upgrading the bearing in the front? Isn't a sealed roller "technically" stronger than a Timken-style bearing?

Re: Generator pulley 59 for a fan bolt om
 

Is your motor hanging on the bell housing , hope the bell doesn't snap off, put a support to hold up front of motor.

Re: Generator pulley 59 for a fan bolt om
 

Yes, disaster waiting to happen

Re: Generator pulley 59 for a fan bolt om
 

I don't know all the answers, Ford had a bewildering variety of generators. It hurts my head to try to understand them. That being said, my understanding is that in 1938 they went to the large 6303 bearing in 3 brush and the soon to arrive 2 brush generators with fan mount pulleys. The 2 brush has a larger generator body, so there are different size front fork plates. The photo shows the larger 2 brush plate on the left, smaller 3 brush plate on the right. The other photos shows the bearings. On the bottom is the multi-part double roller bearing used 1932-1837, in the middle is the large 6303 bearing used in 1938-1939, at the top is the 6203 bearing used afterwards for non-fan mount pulley generators. There are many other variations. But this is a general overview.

Re: Generator pulley 59 for a fan bolt om
 

Late great Bruce Lancaster said, " looking at the generator section in the green book will give you a headache. Good photos ndnchf, thanks

Re: Generator pulley 59 for a fan bolt om
 

Thank you. This is very helpful.

Re: Generator pulley 59 for a fan bolt om
 

Not left hand threads.