generator rebuild for 1947

[Gary Blakeslee]

I am rebuilding the generator for a 1947 convertible with hydramatic drive.  I have a spare but the pulleys are different in dimension sizes.  One is 3 1/2" the other is 3 1/16" which one is right?

                                                      Gary Blakeslee

[bcroe]

I don't know what the historians would say.  But if you do a lot of slow driving, engine
idling a lot, lights on, running the heater motor, the smaller pulley will help the
generator run faster to keep up.  If its largely at highway speeds/lights off/warm
weather, the larger pulley should work.  Add air cond, better convert to an alternator. 

Bruce Roe

[Gary Blakeslee]

Thanks Bruce,  the small pulley has it's advantages so that's the one I will use.
                                             Gary

[John Washburn CLC 1067 Sadly deceased.]

Gary,

The Master Parts List specifies:

1941, 1942, 1946, and 1947      3 1/16" Pulley O.D. of front flange

john washburn

[Bob Schuman]

Gary,
The 3-1/2" generator pulley was originally for cars with the 3.77 differential ratio(mostly manual transmission models), and the 3-1/16" pulley was for cars with the 3.36 differential ratio(mostly HydraMatics and optional with manual transmission). The smaller pulley was to compensate for the engine turning slower for a given speed when equipped with the 3.36 differential. The way our cars get driven now, I agree that the smaller pulley is advisable, regardless of the differential gears. If only the larger pulley were available, I would not hesitate to use it, however.
Bob Schuman,CLC#254