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Johnnyj 04-22-2013 08:05 PM

1947 starter torque

How tight can an engine in a 1947 1/2 ton be before the starter cannot crank it over. Does anyone know the torque value for that starter

Tom Wesenberg 04-22-2013 08:31 PM

Re: 1947 starter torque

My 1960 Motor's Manual is handy but only goes back to 1953 and lists the torque test as 700 amps, 3.5 volts, and 16 pds. ft. torque.

PC/SR 04-22-2013 08:52 PM

Re: 1947 starter torque

My old MOtor Manual lists the 1938-48 as 100 RPM cranking speed, 14 lb of torque, 550 load amps, 45-60 spin amps. I am surprised at the low torque, but then the gear ratio to the flywheel is a substantial multiplier.
To tie this into this forum, I would guess that the model A starter is not much different because there is some interchange on the parts. My mix and match 12 v conversion has a 56 field coils, Model A end plates and flathead armature. Others may have more info.

MikeK 04-22-2013 09:28 PM

Re: 1947 starter torque

The starter drive to ring gear ratio is very close to 15:1. If you put a torque wrench on the front crank bolt and it turns over with less than 150 ft-lbs then a starter that gives more than 10 ft-lbs of stall torque will turn it. If 150 ft-lbs doesn't budge the crank forget the starter, fix the motor!

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