I test fitted the starter and noticed that the pinion does not retract when it is released on the engine stand. Why?
It is normal for a gear reduction starter to hang in the ring gear when the engine is cranked, and yet does not start. Direct drive starters do not do this because they can rotate the small amount necessary to retract the pinion. Gear reduction starters do not retract in this situation because of the resistance of the gears. The tiny amount of rotation necessary to retract the pinion is amplified in the gear ratio inside the starter, requiring four to five times the rotation insude the starter. All of this gear movement results in the pinion remaining in the ring gear until the engine fires.
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