Starter assembly do not last to the life of starter motor. The starter drive should be replaced by the technician over a period of time. Noise that can be heard coming from the starter is usually produced from the drive. The starter or grinds and does not turn engine over reliably. Sometimes, the overrunning clutch will slip in one direction when it wears internally. Test it by trying to turn the drive in both the directions. Sometimes, it is necessary to wiggle the gear and attempt to turn it slightly to get it slip.