We had a traveling mechanic come out to check the car. He explained that the timing belt snapped. The symptoms before the mechanic were the car did not turn over. It would not turn over (even when jumping). The The mechanic says we will have to take it into the shop and get a new head. Is this possible? what CAUSES the damage of the timing belt snapping? Thanks to any and all who offer information. I am a poor man and i need any help i can get.