an engine doesnt run one way then change direction your fibbing about that part.
the engine would need to have a reason to change direction after 10 seconds which it doesnt have
and the engine would have to come to standstill to chage direction, it would stall before this happens. not to mention the engine is probly incapable of being manually turned backwards, let alone running backwards. a busted one way bearing is one thing but a backwards running engine is another.