The Ford Barn

Johnnyj · 04-22-2013, 08:05 PM

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

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

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

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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!

04-22-2013, 08:05 PM	#1
Johnnyj Member Join Date: Jan 2013 Location: Greenville, sc Posts: 30	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

04-22-2013, 08:31 PM	#2
Tom Wesenberg Senior Member Join Date: May 2010 Location: Mpls, MN Posts: 27,582	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.

04-22-2013, 08:52 PM	#3
PC/SR Senior Member Join Date: May 2010 Location: Santa Rosa, CA Posts: 1,278	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. Last edited by PC/SR; 04-22-2013 at 09:02 PM.

04-22-2013, 09:28 PM	#4
MikeK Senior Member Join Date: May 2010 Location: Windy City Posts: 2,919	Re: 1947 starter torque Sponsored Links (Register now to hide all advertisements) 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!