Timing Belt Buying Guide
Last updated: 24 April 2026
The timing belt synchronises the rotation of the crankshaft and camshaft(s), ensuring valves open and close at the correct time. A snapped belt can cause catastrophic engine damage (bent valves, damaged pistons) in interference engines. Replace at the manufacturer's interval without exception.
Timing belt replacement intervals
Intervals vary significantly by engine — check your manufacturer's specification.
- Typical intervals: 60,000-100,000 miles or 4-6 years, whichever comes first
- Always replace the tensioner and idler pulleys at the same time
- Consider replacing the water pump if it's driven by the timing belt
- Never exceed the manufacturer's replacement interval
- Keep records — a documented timing belt history adds value to your car
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Replacement intervals, interference vs non-interference engines, and why timing belt failure is catastrophic.
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Frequently Asked Questions
How often should the timing belt be replaced?
Every 60,000-100,000 miles or 4-6 years depending on the engine. Check your manufacturer's service schedule for the exact interval.
What happens if the timing belt breaks?
In interference engines (most modern cars), a broken timing belt causes pistons to hit valves, resulting in bent valves, damaged pistons, and potentially a destroyed engine.
Should I replace the water pump with the timing belt?
If the water pump is driven by the timing belt, yes. Labour is the major cost — replacing both together saves money long-term.
Related Guides
P0340 fault codes, misfires, and rough running — how camshaft sensors control valve timing and when to replace them.
Crankcase Ventilation (PCV) Valve Buying GuideOil leaks, high oil consumption, and rough idle — how the PCV valve prevents pressure build-up, clogging symptoms, and easy replacement steps.
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