The car is a 2003 Misubishi Eclipse. Now they are telling me that it is a hydraulic tensioner adjuster and that the bolt that broke on the bracket is what caused the belt to break. They said they only changed the timing belt because it got antifreeze on it during the water pump/coolant pipe install. They said the tensioner looked new so they didn’t think it needed to be changed. They said this even though they have said that other work done previously on the car did not seem to be done to a very high standard. So now, somehow the bolt that holds the tensioner onto the bracket was apparently over tightened by previous mechanic and they never removed this bolt until the belt broke because the belt just slipped on over it, but that it was just snapped in two. If the bolt broke how did the belt snap from being too tight? Would the belt have not become more loose if this were the case?
It almost sounds to me as the new belt caused the bolt to break.
How does an overly tightened bolt holding the tensioner to the bracket just break?
How do they know it was overtightened?