Why this one job matters so much
On many engines, the cambelt (timing belt) keeps the crankshaft and camshaft in sync. If it snaps on an interference engine, valves and pistons can collide. That is not a roadside inconvenience. It is often a four-figure repair, sometimes a write-off for an older car.
That is why buyers treat cambelt evidence as a separate question from "has it been serviced." A car can have regular oil changes and still be overdue for the belt.
Belt vs chain, and why the wording matters
- Timing belt / cambelt: a rubber belt with a stated replacement interval in years and miles. Both limits matter. A low-mileage car can still be overdue on time alone.
- Timing chain: usually designed to last longer, but not forever. Rattle on cold start, stretched-chain fault codes, or repeated guidance in MOT advisories can still signal trouble.
Never assume from the badge alone. Two engines in the same model range can differ. Check the exact engine code or ask a franchise specialist for that car's interval before you rely on a seller's guess.
What a useful record looks like
A solid cambelt record is more than a handwritten note saying "belt done." You want a date, the mileage at the time, and ideally an invoice listing the belt, tensioner and water pump if they were done together, which is common on many engines.
Manufacturer digital history helps when the work was done at a franchise dealer, because the visit is harder to invent after the fact. A ServiceBoss report can show whether dealer-logged major work sits on the timeline. Independent invoices still count, but read them carefully and match them to the odometer.
If the schedule says "every 5 years or 60,000 miles, whichever comes first," a five-year-old car with 30,000 miles can still be due. Sellers often quote only the mileage figure.
If the record is missing
No proof does not automatically mean the belt was never done. It does mean you should price the job into the buy, or get it done before you rely on the car for long trips. Asking the seller to reduce the price by a realistic garage quote is a normal part of private buying.
Also check whether the model has open safety recalls that could overlap with engine or timing-system work. MOTCO's recall check is a quick way to see whether the manufacturer has an outstanding notice against that registration before you argue about old invoices.
Common questions
Can I tell from an MOT if the cambelt was changed?
Not reliably. MOTs do not record cambelt replacement as a standard pass item. You need service invoices or a dealer digital record.
Should the water pump be changed with the belt?
On many engines, yes, because the labour overlaps. An invoice that only lists a belt, with no tensioner or pump, is worth questioning with a specialist for that model.