Replace belts if contaminated; when installing a new idler or tensioner; or making major repairs like replacing a leaking water pump or worn timing belt. Unless you just replaced the drive belt ...

Timing belts are a maintenance item; they can wear out and fail without warning. Check your owner’s manual. It pays to know which kind of engine you have and the recommended replacement intervals.

On the downside, belts wear out over time and need to be constantly checked for wear or breakage. A typical timing belt lasts around 100,000 miles (give or take, depending on the vehicle ...