How often should you replace your car’s timing belt?

Consumer writer Siobhan Doyle explains how often you should replace your car’s timing belt, what affects its lifespan and the warning signs that it’s time for a new one.

Your car’s timing belt, also known as a cambelt, keeps two essential engine components – the crankshaft and camshaft – working in sync. However, over time, the belt can deteriorate, becoming worn, stretched or cracked.

Factors such as heat, friction, age and exposure to oil or coolant leaks can all affect how long a timing belt lasts.

In this handy guide, I’ll explain how often you should replace your car’s timing belt, what affects its lifespan and the warning signs that it’s time to have it replaced.

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How often should you replace your car’s timing belt?

You should replace your car’s timing belt every 50,000 to 100,000 miles or roughly every five to 10 years, whichever comes first. Always check your vehicle’s manufacturer’s recommendations, as replacement intervals can vary.

Why is it important to replace your timing belt?

I’d recommend replacing your timing belt at the recommended intervals to help prevent catastrophic engine damage and maintain your vehicle’s reliability. A worn or damaged timing belt can snap without warning, potentially causing extensive damage to internal engine components.

Replacing it as part of routine maintenance is far more cost-effective than facing the potentially enormous expense of an engine rebuild or replacement. Depending on the extent of the internal damage and your vehicle’s make and model, you could be looking at a bill of between £1,000 and £8,000 or more.

What are the signs that your timing belt needs replacing?

Here are seven common signs that it’s time to replace your car’s timing belt:

1. Unusual noises: Ticking or clicking noises coming from your engine could indicate that your timing belt is worn, loose or damaged.
2. Engine misfiring: A worn or stretched timing belt can disrupt engine timing, causing the engine to misfire or run poorly.
3. Rough idling: If your car shakes or vibrates while stationary, it could be a sign that the timing belt isn’t working properly.
4. Difficulty starting: If the timing belt slips or snaps, your engine may struggle to start or fail to start altogether.
5. Oil or coolant leaks: Leaks near the timing belt cover can damage the belt’s rubber, causing it to deteriorate prematurely.
6. Visible wear: Cracks, fraying, missing teeth or other signs of damage on the belt indicate that it may need replacing.
7. Check engine light: Problems with engine timing can trigger the check engine warning light, although this can also indicate other faults.

How much does it cost to replace a timing belt?

The total cost to replace a timing belt typically ranges from £300-£700, with the nationwide UK average sitting right around £430 for parts and labour, according to online directory Checkatrade.

Car timing belt FAQs

Can I change my car’s timing belt myself?

Yes, you can change your car’s timing belt yourself if you have strong mechanical knowledge and experience. However, it’s an advanced job that requires specialist tools, technical expertise and a repair manual for your exact vehicle model. If you’re unsure, it’s best to leave it to a qualified mechanic.

Can a worn timing belt affect engine performance?

Yes, a worn timing belt can affect engine performance because it may stretch or slip, disrupting the timing between the crankshaft and camshaft. This can cause engine misfires, rough idling, reduced power and difficulty starting your car.

Does a timing belt affect fuel consumption?

Yes, a worn or stretched timing belt can affect fuel consumption by disrupting engine timing. This can make the engine run less efficiently, potentially increasing fuel consumption as a result.

Can I repair or reuse my timing belt?

No, a worn or damaged timing belt cannot be repaired or safely reused. It should always be replaced with a new belt to prevent it from snapping and causing engine damage.

Do electric cars have timing belts?

No, electric cars don’t have timing belts because they don’t have internal combustion engines. Timing belts are designed to synchronise the crankshaft and camshaft in traditional petrol and diesel engines.

Should I replace my timing belt every five years?

Not necessarily. Timing belt replacement intervals vary by vehicle, with many manufacturers recommending replacement every five to 10 years. Always check your car’s handbook for the specific recommendations for your model.

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