The short answer: Most manufacturers specify a timing belt replacement somewhere between 60,000 and 100,000 kilometres, or 7 to 10 years — whichever comes first — regardless of how the belt actually looks when inspected. Check your specific logbook, since the interval varies noticeably between makes and models.
A timing belt keeps your engine's crankshaft and camshaft turning in exact synchronisation, controlling when each valve opens and closes relative to the pistons. Rubber timing belts don't fail gradually with visible warning signs the way brake pads do — they typically fail suddenly, without notice, once they've reached the end of their rated life.
What happens next depends entirely on your engine design. On an "interference" engine — a very common design — the pistons and valves occupy the same physical space at different points in the rotation, kept apart only by precise timing. If the belt snaps, valves and pistons can collide, bending valves and sometimes damaging pistons or the cylinder head. This typically turns a scheduled few-hundred-dollar replacement into a multi-thousand-dollar engine rebuild or replacement.
Worth knowing: Many manufacturers recommend replacing the water pump at the same time as the timing belt, since it's driven by the same belt and is already exposed once the belt is off — doing both together saves a second labour charge later.
If you're not sure whether your car has a timing belt or a timing chain (chains generally don't need scheduled replacement), or you don't know when yours was last done, bring your logbook or rego papers in and we'll check your specific model's interval.
Not Sure When Your Timing Belt Is Due?
We'll check your model's specific interval and give you an honest answer — no scare tactics.