Hi gang! I find myself in need of a bit of help with a project I'm working on for fellow H.A.M.B.er Endlessearth. In his '29, he has a '38 or '39 21 stud flathead (water pumps down in the block, looks much like 59A motor), and due to changing the front sheet metal about a bit, we have to set up a fan drive. I have managed to source a fan bracket (wide belt, hangs low from the generator bracket with the pulley well out in front of the water pump/generator belts) that I am pretty sure is '40s era truck stuff. I have quite a bit of room with this to make it happen. The problem is two fold. Although I have worked with flat heads before, never late 21 stud stuff, and, I have always been lucky enough to work with rather unmolested, complete stuff as far as fan drives and such. I have been researching through my rediculously complete magazine collection, and done a couple of searches here on the H.A.M.B., and haven't turned up what I need. So here is the question; does anybody have a clear picture of how all this goes together? What pulley am I going to have to source to put this deal together? The one I have to use now has just a single groove. I will need a double groove at least. How about just some pictures of how you guys solved the flat head fan delema? We pulled a 16" electric fan out of the old track nose that was on this car, and it won't fit inside the new '32 grill shell in a pusher configuration, nor do I want it to be seen in the engine compartment either. I am not a super huge fan of electrics on a hot rod that will spend it's time running around Arizona anyway, so if I can avoid it, I want to go mechanical... What say you guys?!
Sounds like you have a '42-8 fan and mount, most likely. You need a '42-8 generator and then all will bolt to your manifold (if multi carb, some special procedures will apply to move gen without moving fan). Drawings: http://www.vanpeltsales.com/FH_web/.../Flathead_Engine_complete1942-48-leftside.jpg This later fan is similar: http://www.vanpeltsales.com/FH_web/FH_images/FH_engine-pics/Flathead_Engine_fan-hub1948-51trucks.jpg So far, easy...now for the trouble! You presumably have a '37-8 21 if pumps are on block. Now you need some '42-48 stuff, the 2-sheave pulley (pump sheave is in proper place for '37) and the bolt and washer for them. But your crank is about an inch too short to ***emble this pile... Soooo...improv time. Get a long bolt or stud (better) with same threads as the ratchet bolt from the '48. make some sort of spacer to add the requisite length. I can dig up that number. Keep the washer from '48, bolt it all together. This will of course be less ridgid than with long crank but I think it'll work. Your handcrank fitment will be gone, though, so you will have to call AAA like a soccer mom when your battery dies.
Thanks Bruce! You were exactly who I was hoping would hear my plea! So it sounds like I'm needing a '42 -'48 crank pulley ***embly and all will be golden. I can get John Evans from here on the board to make up th requisit spacer, so that shouldn't be a big deal. The generator on this car is already a '42 -'48 type as it has the side by side two bolt holes for mounting the fan. It appears after looking at the second diagram you posted that I must have the later type fan and bracket. Does this unit have replaceable bearings, or is the this the one that I hear reffered to as "oil filled" bearings? I haven't had time to pull it apart yet to check. Thanks again, Chip Quinn
Same general style of bracket was used in several variants 1942-48 and '49-53. I'm really only into early Fords, so not sure of differences beyond the pulley variants for the late ones. I think all early Ford ones used plain bearings and oil, Joblot has parts for rebuild, later ones used some the same and some with a sealed can containing I would ***ume some sort of roller bearing. I think if you got a good one of those you could perhaps drill a hole to wash it out and refill with grease that's younger than you are. Might be some useful stuff in this ancient post: http://www.jalopyjournal.com/forum/showthread.php?t=35029&highlight=dimensional+stuff&showall=1 There was actually a commercial crank extender for this installation once! I bought a '42-48 pulley at Carlisle once because it contained some sort of odd inclusion I wanted to investigate... pounded it outtathere, and it was a steel slug exactly corresponding to the difference between a short crank (all 21 stud, 1938 24 stud) and a long crank (all 1939-53). It had a threaded stud to fit the front of the crank and the needed keyway. This is kind of puzzling, because tightening it onto a acrank by its stud would seem to be unlikely to line up the keyaway! No idea why this part existed. If I had to do the job I think I would use a simple steel bar cut to clear the key, and drill though the center. I would then try to find a suitable stud and nut to go through the whole mess and pull it all up tight. And I'd miss the crank fitting...
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