What Is A Timing Belt, And When Should It Be Replaced?

A timing belt is a rubber belt with interlocking teeth that connect with your engine's crankshaft and camshafts. It's responsible for synchronising the parts of your engine, and might also power the water, oil and injection pumps.

Without a timing belt, the crankshaft and camshafts won't operate in sync, and your car won't run smoothly. It might experience poor combustion, power loss, or even extensive damage.

Some vehicles have a timing chain instead of a timing belt. A timing chain is made of metal and operates in the same way as a timing belt.

While timing belts feature lighter weight and quieter operation, timing chains tend to be more durable and more modern vehicles include them within their engines.

Your vehicle manufacturer will stipulate the particular intervals at which your timing belt should be replaced. This is typically every 96,000-160,000 kilometres, and you'll find the specific recommendations for your vehicle in your owner's manual.

As timing belts are made from rubber, they are prone to wear and will break, resulting in engine damage or failure, and broken or damaged valves, camshafts, pistons, and cylinders.

It's therefore important you replace your timing belt when recommended - you'll keep your engine running smoothly and will avoid hefty repair and replacement costs if your engine becomes damaged.

While you might not be able to detect deterioration in your timing belt, there are some signs to look out for that might mean a replacement is on the cards:

Your final cost will depend on your car's make and model, but you'll generally pay between $500-$1,000.

Costs will also depend on whether your car needs a full timing belt kit replacement, which might include bearings, a tensioner, and seals. You could end up paying more if your timing belt has broken, as you may need additional repairs to your engine if it's been damaged.

Your mechanic might also recommend replacing the water pump at the same time, to help save money down the track and to prevent your timing belt from failing.