Re: starters

Posted by Janicholson on December 25, 2019 at 06:52:55 from (24.240.46.228):

In Reply to: starters posted by Ellis Kinney on December 25, 2019 at 06:05:56:

What I understand. The original starter designed by Delco, has a pinion that is moved into engagement with the ring gear by the inertia of the pinions mass. Inertia is the resistance to movement caused how much it weighs. In this case it is the fact that the starter motor is a very aggressive type of motor with quick spinup when it is given battery voltage. The pinion is mounted on a spiral spline that is part of the motor shaft. The Motor quickly drives the pinion out along the spiral splines, stretching the big flat coiled spring. As the ring gear now turns and the engine starts, the speed of the ring gear teeth exceed the speed of the pinion teeth and that motion releases the pinion to be pulled back on the spiral splines, to it's resting position, away from the ring gear.
The new style drive is similar, but uses a cushion in the pinion assembly, and a much weaker spring. The return from starting the tractor engine is more driven by the speed of the ring gear teeth pushing the pinion back away from the ring gear, with retraction fully made by the lighter spring.
The new style seems to be more rapid in extension to engagement, allowing a more likely stab into the teeth of the ring gear while nearly not rotating.
The new drive also seems a little more centered and less likely to get jammed if the teeth don't slide into place perfectly.
A worn end frame bushing on the starter snout will also allow either drive to get crooked.
No one has done high speed (slowmo) photography in the housing to compare the two, so my story can't be substantiated other than they seem to be a reasonable and less expensive solution. One person on this site has indicated that the one he used failed soon after installation. Others seem satisfied. A worn spiral spline, and bushings may also contribute to any repair being inadiquate. Jim

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