Timing Belt vs Timing Chain

Maintaining the longevity of your car and its engine is easier when you understand what's actually going on under the hood. One crucial element of any car's engine is the timing system, which ensures that the camshaft and crankshaft move in unison, allowing engine components such as pistons and valves to open and close at the correct time. 

To enable the synchronisation of the timing system, your car will have either a timing belt (also known as a cambelt) or a timing chain in place. They both serve the same function but operate in slightly different ways.

In this guide, we'll explore how timing belts and chains impact your engine's performance, the key differences between them, signs that your belt or chain might need to be replaced, and the associated costs. Read on to find out more.

What is a timing belt (cambelt)?

Timing belts, also known as cambelts, are belts made from reinforced rubber with teeth that keep your engine's crankshaft and camshaft in sync; they're often strengthened with fibreglass or Kevlar for added durability and flexibility. Your timing belt controls when the engine's valves open and close in an internal combustion engine. 

When it comes to replacement costs, drivers can expect to pay between £300 and £650; however, this amount depends on the model of your car and any associated labour costs.

Timing belt pros and cons

The pros and cons of your timing belt include:

Pros:

• They're often quieter than timing chains

• Replacement costs are often cheaper

• Smoother running and fewer vibrations when driving

Cons:

• Replacement intervals are typically every 60,000-100,000 miles

• They're prone to lots of wear and tear, such as snapping or cracking

• Often located outside the oil-lubricated engine chamber, so more exposure to dirt and heat

• Can fail suddenly and snap without warning

What is a timing chain?

A timing chain works in a similar way to a bicycle chain, and, like the timing belt, it is an essential component of your vehicle's timing system. It connects the crankshaft to the camshaft, keeping the engine's moving parts in sync. 

Unlike belts, timing chains are housed inside the engine and need engine oil for lubrication. As they're usually made from hardened steel, metal chains are long-lasting and typically do not have a fixed replacement interval. However, manufacturers tend to recommend regular service checks and oil changes, as neglecting these can cause components to stretch and wear prematurely.

If you have a car from the early 2000s or newer, you're more likely to have a timing chain rather than a belt. And looking at replacement costs, drivers will pay more than belts, typically around £500-£1,300.

Timing chain pros and cons

The pros and cons of your timing chain include:

Pros:

• Low maintenance

• More durable and longer-lasting than rubber belts

• Found inside the engine, so less exposure to dirt and damage

• Better for high-performance vehicles, but there are some that do use belts

Cons:

• More expensive to replace

• Older chains tend to be noisier than belts. However, modern chains are nearly silent

• More wear occurs if oil changes are skipped and maintenance is not up to date

• Much heavier
   

How do I know if my car has a timing belt or a timing chain?

Knowing whether you have a timing belt or chain can help you manage engine performance and avoid unexpected, costly repairs. Here's how you can find out.

• Check your owner's manual: A quick and reliable option. Check under maintenance schedules or engine specifications for information.

• Search online: Websites, forums, or manufacturer sites can provide valuable information.

• Look for a timing belt cover under the bonnet: Timing belts are usually covered by a plastic cover on the side of the engine, while timing chains are inside the engine and are harder to see.

• Consider your car's age and type: Modern engines and luxury cars often feature timing chains for enhanced durability. If you have an older car, you're more likely to have a timing belt.

• Ask a professional: If you're still unsure, a mechanic can quickly identify which one you have.

What are the key differences between timing belts and timing chains?

The key differences between timing belts and chains are:

What are the common signs my timing belt or timing chain needs replacing?

To prolong engine life and avoid severe engine damage, drivers should make themselves familiar with the most common signs of belt or chain issues. Also, remember to check out the manufacturer's replacement schedule if you have a timing belt. Common signs include:

Timing belt:

• Mileage

• Engine misfires

• Ticking or clicking noises

• Check engine light

• Visible wear

Timing chain:

• Rattling noises

• Metal shavings in oil

• Poor maintenance history

• Engine performance issues

Can I replace a timing belt or chain myself?

If you have the right tools and mechanical knowledge, then yes, you could technically replace it yourself. However, it's worth remembering that replacing a belt or chain is complex and getting it wrong can cause damage to the engine components or result in complete engine failure. It’s generally recommended to reach out to your local garage to have trained technicians ensure everything is aligned correctly and to avoid even more costly repairs.

Timing belt vs. timing chain: which is better?

Ultimately, when it comes to determining which is better, there is no clear winner. Both timing belts and timing chains have their own pros and cons. What matters most is keeping up with your car's maintenance schedule to ensure optimal performance and reduce the risk of serious issues later on. Remember, keeping your car's timing system in good condition will help keep your engine running smoothly for years to come.