Post: Is it time to replace my timing belt

Most belts seem to need replacement every 60,000 to 70,000 miles. You should be able to find this information in your car’s service manual. This is only a rough estimate, as some belts will unexpectedly break before this, while others will still be in good shape after 100,000 miles of wear.
Visual Assessment
The best way to check the condition of a timing belt is by observation. By opening the hood and removing the cover that protects the belt, you should be able to visually determine if the belt needs replacement. When you look at the belt, if the outer surface is visibly worn, it may need to be replaced. If you see areas that are thinning, or small cracks in the synthetic rubber, then you definitely need to consider replacing the belt sooner rather than later.
If It Breaks Completely
Timing belts don’t just gradually stop working over a period of time. They’re an essential part of your car’s engine, so whether the belt breaks completely or a few teeth fall off the inner surface of the belt, the result is the same: the car won’t run unless the belt is replaced. If a few teeth of the belt are off, the belt will not be able to properly grip the heads of the camshaft and crankshaft, so the belt will either slip or stop transferring power from one part of the engine to another.
Regular Replacement
The best way to avoid unexpected timing belt breaks is to replace them regularly. Replacing the belt every 60,000 miles will prevent the belt from completely wearing out while driving. If you are going on a long trip, it is best to have a mechanic check your timing belt before you leave.