Timing belt
A toothed belt that keeps the engine's valves and pistons moving in step.
In plain English
The timing belt is a toothed rubber belt inside the engine's front cover. It links the crankshaft to the camshaft so the valves open and close at exactly the right moment as the pistons move. Not every engine has one; many use a metal timing chain instead.
Why it's on your estimate
It is a scheduled replacement: car makers list a mileage or age at which it should be changed, whether or not it looks worn. Shops often suggest replacing the water pump and tensioner at the same time, because they sit behind the same covers.
How urgent is it?
Don't wait
If your car is at or past the scheduled interval, don't delay. A timing belt usually gives no warning before it breaks, and on many engines a broken belt lets valves and pistons collide, which causes very expensive damage.
Questions to ask the shop
- Does my engine have a belt or a chain?
- What interval does the manufacturer list for my car?
- Does the quote include the water pump and tensioner?
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