Like Bob said, arcing and welding because of the low voltage/high amperage caused from a discharged battery.
Another thing that happens, on the Delco type starters with the solenoid on top that pulls in the starter drive... The spiral on the shaft that the drive slides on, if the thrust bushing is worn, broken and gone, lets the drive spiral further out on the shaft than it should. That causes the fork that pulls the drive into the flywheel, to move further than it should, resulting in the plunger being pushed into the solenoid by the starter torque, transferred through the spiral on the shaft, which holds the contacts in the solenoid closed.
With a good battery, the engine is turned through the compression stroke, then the engine turns itself as the compression rebounds, or it starts. When the load is relieved on the starter, the plunger moves out slightly and opens the contacts if the start signal had been removed.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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