What is a timing belt and when to replace it
How a timing belt works, what happens when it snaps, and how to find your replacement interval.
A timing belt synchronises your engine’s crankshaft and camshafts. If it snaps, the pistons hit the open valves and the engine is destroyed. Replacement before failure is the cheapest engine you’ll ever save.
What it looks like
The belt is rubber, reinforced with fibre cords, and wraps around the crank pulley, cam pulleys, water pump, and tensioner — usually behind a cover at the front of the engine. You can’t see it without taking the front off.
When to replace
- Manufacturer interval: typically 60,000–100,000 miles (96,000–160,000 km) OR 5–7 years, whichever comes first
- Look up your specific engine in the handbook — wide variance
If your car is at the interval, replace. Don’t roll the dice — a snapped belt on an interference engine writes off the engine block. Cost: €4,000–€8,000 to fix vs €380–€650 to prevent.
What we replace at the same time
- Timing belt (obvious)
- Tensioner
- Idler pulleys
- Water pump — sits behind the timing belt cover. Replacing it later means doing this entire job again. €60 of extra parts saves the labour cost a second time.
- Auxiliary belt (if old)
- Crank seal (if leaking)
Common engines that need belts
- Ford 1.0 EcoBoost (wet belt — special case)
- Ford 1.5 / 1.6 EcoBlue diesel (wet belt)
- Peugeot / Citroën / Opel 1.2 PureTech (wet belt)
- Fiat 1.3 Multijet
- VAG 1.6 / 2.0 TDI (older)
- Toyota 1.4 / 1.6 / 1.8 D-4D (older)
If you have a chain-driven engine, see timing chain replacement instead.
Book a timing belt replacement — phone 01 847 5146.