Join Date: Sep 2011
Location: Tredegar,South Wales, near England, not far from Scotland.
The 5000 mile trip shouldnt make any difference to wear on the starter motor as it would only be used to start the engine not run it..
I haven't stripped a shadow starter yet but I have worked on others..so..
The motor has the central part which rotates and is called the rotor, this has segments at the end made of copper and connected to a wiring loom, these segments are called the commutator and are pollished and set in a circle with gaps between each segment..The carbon brushes bridge this gap as the rotor spins..If one of these segments is damaged or broken it will quickly damage the soft brushes.
Car starters are disconnected from the gears they drive by a return spring, they connect by inertia as the motor spins, if this spring is not working the motor will be driven continuously by the gears and quickly wear out..
If the brushes are too soft they will quickly wear out..
If the brushes are too hard they will wear a groove in the commutator..
A sprag clutch is a sort of one way bearing..rather like a socket wrench as I understand it, when you press the starter it drives the gears and when you release the starter switch and the engine runs it freewheels..I could be corrected here if someone wants to jump in..
Beauty is only skin deep but ugly goes right to the bone.
Last edited by John Hopkins; 11-21-2012 at 10:32 PM.