A timing belt is a toothed rubber belt inside the front of the engine. It links the crankshaft to the camshaft so the engine’s valves open and close at exactly the right moment. When it breaks, the engine stops at once, and on some engines the damage does not end there. Because the belt can fail without notice, timing belt replacement is a scheduled job: you do it by mileage, before the belt gives you a reason to.
Short answer: most manufacturers call for a timing belt replacement somewhere between 60,000 and 100,000 miles (AAA), and Cars.com puts the range at 60,000 to 120,000 miles. Your owner’s manual has the exact interval for your engine. Not every car has a belt, so check first.
Does your car have a timing belt or a chain?
Some engines use a timing belt and others use a timing chain. The two do the same job, but they are serviced very differently. According to Cars.com, belts are quieter and cheaper to make and to replace, while chains typically last longer, and many last the life of the car. A chain is not a scheduled replacement item in the same way, although a worn chain or its parts often announces itself with a rattling sound.
How to find out which you have:
- Open the maintenance section of your owner’s manual and look for “timing belt” in the schedule. If it is listed with a mileage, you have a belt.
- If the manual never mentions it, the engine most likely has a chain, but confirm with the dealer or a trusted shop using your VIN.
- Do not guess from the brand or the model year. The same model can use a different engine with a different design.
How often to replace a timing belt
The honest answer is a range, and the sources give slightly different ranges:
| Source | Interval stated |
|---|---|
| AAA | Manufacturers typically recommend somewhere between 60,000 and 100,000 miles |
| NAPA Know How | Typically between 60,000 and 100,000 miles, as set by the owner’s manual |
| Cars.com | Most belts need replacing every 60,000 to 120,000 miles |
The lower end of every range is the same, 60,000 miles. The top end varies with the engine and the maker. None of the three sources gives a time limit in years, so do not assume one. Look in your own manual: some manufacturers list both a mileage and a number of years, and the manual is the only source that matters for your car.
Warning signs of a worn belt
A belt can fail with no warning at all, and Cars.com says so plainly. Even so, there are signs that something is wrong with the belt or the parts around it. AAA lists these:
- Engine misfires
- Difficulty starting
- An engine that runs unevenly, with performance that varies over 2,000 RPM
- Ticking noises from the engine
- Smoke or fumes from the engine
NAPA adds visible wear on the belt itself: spotting, staining or fraying, and a high-pitched noise from under the hood such as shrieking. Cars.com explains that worn teeth or a bad tensioner can cause the belt to skip, which may show up as a misfire or a ticking sound.
None of these signs prove the timing belt is the cause, and several have other explanations. The point is the reverse: if your car is past the manual’s interval and shows any of them, stop driving it hard and have it inspected rather than waiting.
Why a broken belt can be so expensive
The reason people take this job seriously is the engine type. In an interference engine, the valves and pistons use the same space at different moments, so there is very little clearance if the camshaft stops turning. NAPA describes the result of a belt failure in that kind of engine as bent intake valves or even a broken piston. Cars.com says the pistons can hit the valves and usually bend them, causing major internal damage. In a noninterference engine, a broken belt still stops the car but should avoid that damage.
AAA says a broken belt can lead to “thousands of dollars” in repairs, and that servicing the belt costs far less than replacing the entire engine. You can find out whether your engine is an interference design from a shop or the manufacturer, but unless you know it is not, assume it is.
What is usually replaced together
Replacing a timing belt means opening up the front of the engine, and most of the cost is labor. That is why shops tend to replace related parts in the same visit:
- The water pump. On most vehicles the timing belt also drives the water pump (NAPA). Replacing both at once saves labor, and Cars.com notes that many mechanics recommend replacing the pump with the belt even if it is not bad.
- The tensioner and pulleys. NAPA says tensioners and pulleys are typically replaced along with the belt.
Ask for a written quote that lists every part included, so you can compare shops fairly. If your engine’s water pump is not driven by the belt, the shop should tell you that, and the quote should reflect it.
What timing belt replacement costs
Cars.com gives a typical cost of $500 to $1,000 for a timing belt replacement. Treat that as a general figure: the actual price depends on the engine, how hard it is to reach the belt, and whether the water pump, tensioner and pulleys are included. Of the other sources we read, neither AAA nor NAPA gives a dollar figure for the job itself, only that skipping it can cost thousands.
Buying a used car with a timing belt
This is where the job most often goes missing. If a used car has a belt and is near or past the manual’s interval, ask:
- Is there a receipt or service record showing the belt was replaced, with the date and mileage?
- Was the water pump done at the same time?
- If there is no record, can the price be lowered by the cost of the job, as if the belt were due now?
A missing record is not proof the belt was never done, but it is a reason to treat the job as due. Our guide to service history and resale value explains why a complete record helps both sides of a sale.
Put it in the schedule once
Because the belt gives so little warning, this job is a good fit for a reminder. Add it to the maintenance schedule with the mileage from your manual, and record the date and odometer reading when it is done. The next due mileage then follows from the last job, and a buyer can see the proof. For the rest of the list, see our maintenance schedule by mileage, and for the budget side, car maintenance cost per year.
Common questions
How often should a timing belt be replaced?
Check your owner’s manual. AAA and NAPA say manufacturers typically call for it between 60,000 and 100,000 miles, and Cars.com says most belts need replacing every 60,000 to 120,000 miles.
What happens if a timing belt breaks?
The engine stops immediately. In an interference engine the pistons can hit the valves, bending them and causing major internal damage, which AAA says can cost thousands of dollars. A noninterference engine should avoid that damage.
How much does a timing belt replacement cost?
Cars.com gives a typical range of $500 to $1,000. The price depends on the engine and on whether the water pump, tensioner and pulleys are replaced at the same time.
Do all cars have a timing belt?
No. Some engines use a timing chain instead, which Cars.com says typically lasts longer and often the life of the car. Look for “timing belt” in the schedule in your owner’s manual.
