When Should a Cambelt Be Changed? Intervals Explained

Why the cambelt matters

The cambelt (timing belt) keeps the pistons and valves moving in step. On most modern engines, if the belt snaps the pistons hit the valves, which can mean a new cylinder head or even a new engine.

There is often no warning before a belt fails, which is why it is replaced on a schedule rather than when it looks worn.

Finding your interval

Intervals vary widely by engine — commonly somewhere between 40,000 and 100,000 miles, with an age limit of around four to ten years. Whichever comes first applies. Your service book or handbook has the exact figure, and we can look it up from your registration.

Age matters. A car that does low mileage still needs its belt changed on time, because the rubber hardens and cracks with age.

Wet belts and chains

Some newer engines use a belt that runs in oil (a wet belt), which needs particular care with oil type and service intervals. Others use a timing chain, which is designed to last longer but can still stretch — listen for a rattle on cold starts.

What to replace with the belt

We replace the tensioner and idler pulleys with the belt as a kit, and on many engines the water pump too, because it sits behind the belt and the labour is shared. Doing it once properly is cheaper than going back in later.

Not sure when yours was last done? Call us on 01384 936310 with your registration and we will tell you what is due.