How can I tell if my timing belt is bad or going bad? Is there a way to visually check the belt? Will the belt become loose, have wear marks, cracks, etc? When i purchased the car the owner said it was changed about 25k miles ago but sometimes you cant believe everything. I know I should just change it if I'm concerned about it but its not the cheapest thing to do. Plan on changing it within the next couple months but would like to make sure it isn't going to snap next week if I can.