Servicing Guide · Updated June 2026 · By the Brad Ward Motors workshop team
Replace your cam belt, also called a timing belt, at the interval your manufacturer specifies, which is typically every 5 to 7 years or around 100,000km, whichever comes first. It is one of the most important jobs you can do on a belt-driven engine, because a cam belt that snaps while you are driving can cause serious and expensive internal engine damage on many cars. The belt itself is a wearing part hidden behind covers, so it gives no warning before it fails. At Brad Ward Motors in Henderson we replace cam belts on all makes and models and give you a quote up front.
- Typical interval is every 5 to 7 years or 100,000km
- Always follow your manufacturer's schedule first
- Time matters as much as kilometres, belts harden with age
- A snapped belt can wreck an interference engine
- Replace tensioner, idlers and often the water pump together
- No record on a used car means treat the belt as due
What a cam belt does
The cam belt keeps your engine's top end and bottom end turning in perfect time with each other, so the valves open and close exactly when the pistons expect them to. On many engines this is what stops the valves and pistons from ever meeting.
Not every engine uses a belt. Some use a timing chain, which usually lasts the life of the engine and is checked rather than routinely replaced. If you are not sure whether your car has a belt or a chain, give us your make, model and year and we will tell you, along with the recommended interval.
When to replace it
Always go by your manufacturer's schedule first, as intervals vary by engine. As a broad guide, many cars call for a new cam belt every 5 to 7 years or around 100,000km, whichever comes first. The time limit matters as much as the kilometres, because rubber belts harden and crack with age even on a low-mileage car.
If you have bought a used car and have no record of the belt being done, it is wise to treat it as due. The cost of replacing a belt on schedule is small next to the cost of an engine rebuild if it lets go. We can check your history and advise honestly whether yours needs doing now or can wait.
What happens if it snaps
On an interference engine, which covers a large share of cars on West Auckland roads, a snapped cam belt lets the valves and pistons collide. That can bend valves, damage pistons and in bad cases destroy the cylinder head, turning a routine maintenance job into a major repair or a new engine.
There is usually no warning. The belt is hidden behind covers and does not give the squeals or noises that a worn fan belt might. That is exactly why it is replaced on time rather than waiting for a symptom. By the time anything goes wrong, the damage is already done.
Doing the job properly
While the engine is apart for a cam belt, it makes sense to replace the tensioner and idler pulleys at the same time, and often the water pump too if it is driven by the belt, because the labour to reach them is already done. Replacing the belt alone and leaving a tired pump or tensioner can mean paying for the same strip-down twice.
At our Moselle Ave workshop we use quality parts, give you a clear quote that sets out exactly what is included, and call you before any extra work. The job is backed by our 12-month workmanship warranty, and courtesy cars are available on request so you are not stuck while it is in.
What affects the cost
We do not list a single price for a cam belt because the real cost depends on your engine, and it varies a lot. The biggest factor is how hard the belt is to reach: a simple four-cylinder engine with the belt behind one cover is a far quicker job than a sideways-mounted V6 where other parts have to come off first. That labour difference is usually bigger than the difference in parts.
The second factor is what goes in with the belt. A belt-only change is cheaper on paper, but a proper job usually includes the tensioner and idler pulleys, and the water pump if it is belt-driven, because they wear at a similar rate and the labour to reach them is already paid for. Doing them together once is far cheaper than a second strip-down later. Quality of parts matters too, and we use parts that meet the manufacturer's specification rather than the cheapest option. Whatever your car, we give you a quote up front that breaks down exactly what is included so there are no surprises.
Common cars and their intervals
Intervals always come from your manufacturer first, but here is a rough guide for cars common on West Auckland roads. Many older Toyota engines and a lot of Mazda, Subaru and Honda models run a belt at around 100,000km or 5 to 7 years. Some engines you might assume have a belt actually use a timing chain, for example many recent Toyota Corolla and Hilux engines, which is checked rather than routinely replaced.
The safest move is simply to tell us your make, model and year and we will look up whether yours has a belt or a chain and the exact interval. If you have bought a used import with no service record, treat the belt as due until proven otherwise, because the cost of replacing it on time is small next to the cost of the engine damage a snapped belt can cause.
Talk to a real Henderson mechanic
Quotes, no surprises, all makes and models. MTA approved, 35+ years on Moselle Ave.