A timing belt is a rubber belt with teeth that helps the engine operate smoothly by linking the camshaft(s) and crankshaft. The camshaft is a spinning shaft that helps with the proper timing of the valves inside the engine to open and close. Meanwhile, the crankshaft helps the pistons move up and down. Connecting the camshaft to the crankshaft with a belt keeps the two assemblies in sync. That way, the valves open and close at the correct time.

It’s worth noting that not all cars have a timing belt. Some have a timing chain (or in rare cases, a set of gears) instead.

How does it break?

The timing belt breaks most often due to lack of maintenance. The timing belt will wear and tear over time because it is made of rubber. When the engine is extremely hot, it causes the belt to naturally lose its strength and texture which results in a snapped belt. As such, the timing belt should be replaced in accordance with the manufacturer’s recommended service schedule. The information is outlined in your car’s owner’s manual.

Another reason for breakage is water pump seizing, which is caused by a lack of coolant system maintenance. When the water pump seizes, it causes the gears to instantaneously come to a halt which will automatically cause the belt to snap.

The timing belt can become more expensive if it is not replaced. If the timing belt snaps, the vehicle will have to be towed. The results of a snapped timing belt can cost thousands of dollars. Also, the valves can bend and ruin the engine, which can result in engine replacement.

It’s highly recommend to have your timing belt replaced by a professional technician or mechanic. Proper tools, skills and knowledge are needed. If the replacement is not done properly and the timing is off on the vehicle, it can result in engine damage and be more expensive in the future. The timing belt cannot be replaced with alternatives.