A cambelt (or timing belt) keeps your engine's valves and pistons in time. Replace it on schedule and it's a straightforward big-ticket service job; ignore it and you risk destroying the engine entirely.
Typical UK price
£300 – £950
Most cars: £450–£700 with water pump included
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Cambelt prices vary more than almost any other routine job — a small petrol Fiesta can come in at £350, while a transverse-V6 Audi can push past £900. Three things drive the spread:
On a transverse 4-cylinder (most family cars), the cambelt is accessible after removing engine mounts and covers — maybe 3 hours' labour. On longitudinal V6 or V8 engines, the front of the engine sometimes needs to come out — 6+ hours.
Replacing the water pump while the timing cover is open is strongly recommended. Parts: £60–£120. Labour: practically nothing extra. Skipping it saves a small amount now and risks a £300 repeat job later.
Greater London garages typically charge £100–£140/hour; independent garages in the North or rural areas often £55–£80. A 4-hour job at those rates is a £240 swing on labour alone.
Cambelts are replaced on time and mileage, not condition. Most car handbooks specify one of these intervals:
Note that the time interval matters even at low mileage. A belt that's done 20,000 miles in 8 years is still 8 years old — the rubber compound degrades with heat cycles regardless of distance.
On most modern engines: catastrophic damage
Most modern engines are interference engines — the valves and pistons share the same physical space and rely on the cambelt to keep them out of each other's way. When the belt snaps, valves bend, pistons crack, and in worst cases the cylinder head needs replacing. Repair bills of £2,000–£5,000 are typical; many older cars are simply written off because the repair costs more than the car is worth.
A handful of older non-interference engines escape with no damage when the belt goes — but if you have to ask, assume yours isn't one of them.
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A cambelt (timing belt) replacement typically costs £300–£950 in the UK, with most jobs landing between £450 and £700. The price varies hugely depending on engine layout — transverse engines are quicker to access than longitudinal ones — and whether you replace the water pump at the same time.
The general rule is every 5 years or 50,000–60,000 miles, whichever comes first — but always check your car's handbook. Some modern engines stretch to 100,000 miles; some performance engines need it every 40,000. A cambelt doesn't fail at a predictable mileage like a brake pad — it fails suddenly.
Almost always yes. The water pump is usually driven by the same cambelt, so it's already exposed when the timing cover is off. Replacing it adds £60–£120 to the parts bill but saves you paying £300+ in labour again later when the pump fails — which it usually does within 20,000 miles of a new cambelt.
On most modern engines, a snapped cambelt means the pistons hit the valves at high speed. The result is bent valves at minimum and a destroyed engine at worst — repair bills of £2,000–£5,000 are common, and many cars are written off. That's why preventive replacement is essential.
You usually can't — there are no reliable visible signs of cambelt wear, which is why it's replaced on age and mileage rather than condition. Some cars show a small belt-change indicator light, but most don't. Check the service history for the last replacement date, and your handbook for the interval.
Many modern engines use a timing chain instead of a belt — chains last the life of the engine in most cases and don't need scheduled replacement. Generally: most Mercedes-Benz, BMW, and many newer petrol engines use chains; most Ford, Vauxhall, VAG diesels and older petrols use belts. Check your handbook to be sure.
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