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Originally Posted by maxhifi
To the OP: is this a theoretical question, or do you actually want to try it?
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In aircraft maintenance school we were required to "hand prop" an engine to life , and this was done with highly retarded (late) ignition timing to specifically eliminate the danger of the engine kicking back . A lever that had a "start" and "run" position had to be closely minded , forget to set it to "start" when starting at one's own peril ! The early cars with hand cranks also had a lever that would retard the timing , a feature that naturally disappeared with the hand crank starter .
Quote:
Originally Posted by Electronic M
Theoretically possible. But most true Automatic cars were built 1941 and later which is several years after they dropped cranks from cars.
An interesting thing is you can roll start some early automatics. I hear they even described it in the owners manual. This ended in the early 60's IIRC. IIRC it needed to be moving at ~20MPH for it to work...Probably only practical on hills.
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Yes indeed , up until the early 1960s most automatic transmissions had a "rear" fluid pump . This pump was connected to the transmission's output shaft , which is turning whenever the driveshaft is , and would supply fluid pressure to engage the transmission's clutches when roll starting . The pump's designed purpose was to prevent transmission damage when towing the car with the rear wheels on the ground , that spinning output shaft needed fluid whether the rest of the transmission was turning or not . Right around the time the rear pump disappeared (due to manufacturing cost considerations) the manufacturers began recommending the cars be towed with the front wheels on the ground (and steering locked) to prevent the transmission damage that would happen if the rear wheels were on the ground .