Guide to timing belt replacements

There are many key components that make a vehicle work correctly – and many need regular maintenance to be effective. Here, we look at timing belts.

An essential part of your car's engine, the timing belt needs to be kept in perfect working order. 

This guide looks at how the timing belt is used, the cost to replace one, and signs you should look out for if there are potential issues with your timing belt.

What is a timing belt?

Also known as a cambelt, the timing belt is a critical component in an internal combustion engine that helps synchronise the rotation of the crankshaft and the camshaft in the vehicle’s engine.

The belt ensures that the engine's valves open and close at the right times during the engine cycle, allowing for efficient operation and performance of the cylinders.

They are typically made of rubber and reinforced with special fibres for strength that can withstand high temperatures and the stresses of extended engine use.

A worn or broken timing belt can lead to serious engine damage – or wider issues within the engine itself.

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Timing belt replacement cost

When it comes to replacing a timing belt, the average cost is around £468. This includes the cost of labour and the replacement parts.

However, the exact price you pay to replace your timing belt will depend on the make, model and age of your vehicle. 

^{Source: WhoFixMyCar, May 2025}

When should you replace a timing belt?

Timing belts typically need to be replaced every 50,000 to 100,000 miles, but the exact interval will vary based on the make and model of your vehicle.

The age of the timing belt will also impact its replacement schedule, with some carmakers recommending a replacement every 5 - 10 years. 

The owner's manual for your vehicle will provide a specific timing belt replacement recommendation. If you are unsure when your car's timing belt was replaced, speak with a local garage or qualified mechanic. 

Signs of a faulty timing belt

Serious issues with a timing belt can lead to wider engine issues, so it's important to watch for signs of trouble.

• Misfiring: If the timing belt is worn or damaged, it can cause the engine's valves and pistons to be out of sync and this can lead to misfiring
• Ticking sound: An early sign of this is a ticking or slapping sound from the engine, which may indicate a loose or worn timing belt. This can also lead to the engine stalling repeatedly
• Vehicle refusing to start: If your car refuses to start then this could be an issue with the timing belt
• Rough idling: If the vehicle shakes, bounces or wobbles when idling then this may be a sign of a timing belt problem
• Experienced mechanics will know how to access the timing belt and check for signs of faults or wear. In most cases, the belt will have signs of cracking or fraying on the surface. The belt may also be loose or incorrectly aligned 

If you notice any of these signs, it’s important to consult a mechanic as soon as possible to avoid more serious engine damage.

How to avoid timing belt failure

Regular servicing is key to avoiding a timing belt failure. If you suspect your vehicle has a timing belt problem, ask a qualified mechanic to check the belt for signs of wear or faults. 

Your vehicle's service history should document when the timing belt was last changed. If it doesn't, arrange for a garage to replace the belt.

What should you do if you do if your timing belt breaks?

When a timing belt breaks, the engine will immediately stop and the steering may start to feel heavy. The brake pedal may also become more difficult to use, with more pressure required to press it down. 

A timing belt can break without warning. If you experience a timing belt failure, you should follow the RAC's instructions of what to do if your car breaks down.

Why has my timing belt broken?

Wear and tear is one of the most common causes of timing belt failure. Over time, the fibres of the belt will become worn and this can result in the belt snapping or jumping.  

It's important to note that timing belts are subject to age-related wear and tear, too. This means a timing belt that is 10 years old with less than 50,000 miles can be just as susceptible to failure as a belt that has covered 100,000 miles in five years.