Stop irreparable engine damage from a broken timing belt or timing chain with a quality timing belt kit from Repco. Containing key timing components to provide accurate valve timing and correct engine synchronisation, you can trust Repco to have the right timing belt kit for your vehicle.

Choose the best timing belt and timing chain kits from Gates, Dayco and Repco to ensure you have the timing kit suited specifically to your vehicle. Engineered to OE standards you can be assured of quality in our timing belts and timing components.

Timing Belt History

In the early days of internal combustion engines, timing was typically managed using gears or chains, and whilst effective had limitations in terms of noise, weight, and flexibility. Advances in material technology and engine design saw timing belts used in automotive engines in the 1960s and 1970s. Timing belts were introduced as a quieter, lighter, and more cost-effective alternative to traditional timing chains and gears.

Timing Belt Advantages

Timing belts offered several advantages over timing chains, including reduced noise and vibration, lower cost, and less weight. These benefits made them particularly attractive for manufacturers looking to improve fuel efficiency and reduce vehicle weight.

Over the years, the materials used in timing belt construction have evolved. Initially made from simple rubber compounds, modern timing belts now incorporate advanced materials such as neoprene, fibreglass, Kevlar or polyurethane. These composite materials ensure increased strength from narrower belts to improve durability and performance.

Modern Engine Timing Developments

While timing belts remain popular, especially in smaller and mid-sized engines, some manufacturers have returned to using timing chains in recent years. Advances in chain technology have addressed some of the noise and durability issues, making them a viable option for many modern engines.

In summary, the development and adoption of timing belts have played a significant role in automotive engineering, offering a reliable and efficient method for engine timing. Their evolution reflects ongoing advancements in materials science and a continual focus on improving engine performance and reliability.

Timing Belt Construction

A timing belt is constructed to be both durable and flexible, capable of withstanding the stresses of engine operation while maintaining precise timing between the crankshaft and camshaft(s). Here are the key components and materials used in the construction of a timing belt:

1. Tensile Cords: Embedded within the rubber are tensile cords, which provide the belt with its strength and resistance to stretching. These cords are typically made from fiberglass, Kevlar, or other high-tensile materials. Fiberglass is commonly used due to its strength and flexibility, while Kevlar offers additional durability and heat resistance.
2. Toothed Surface: The inner surface of the timing belt features a series of molded teeth that mesh with corresponding grooves on the engine's timing pulleys (sprockets). These teeth ensure precise synchronization between the crankshaft and camshaft(s), allowing for accurate valve timing.
3. Protective Fabric Layer: Some timing belts include a protective fabric layer on the toothed surface. This layer reduces friction and wear on the teeth, extending the belt's lifespan and improving its performance under varying conditions.
4. Heat and Oil Resistance: The materials used in timing belt construction are selected for their ability to resist heat and exposure to engine oil. This is crucial for maintaining the belt's integrity and performance over time, as it operates within the engine compartment where temperatures can be high.

Overall, the construction of a timing belt is designed to balance flexibility, strength, and resistance to environmental factors, ensuring reliable operation throughout its service life.

Differences Between Timing Belts and Timing Chains

Material and Construction:

• Timing Belt: Made of rubber with high-tensile fibers (often fiberglass or Kevlar) for strength. It is typically housed in a protective cover to keep out dirt and debris.
• Timing Chain: Made of metal links similar to a bicycle chain, providing more durability and longevity. It is usually housed inside the engine and lubricated by engine oil.

Durability and Lifespan:

• Timing Belt: Generally requires replacement at regular intervals, often between 80,000 and 150,000 kilometres, depending on the vehicle manufacturer�s recommendations. The rubber material can degrade over time due to heat and wear.
• Timing Chain: Designed to last the life of the engine, often exceeding 250,000 kilometres. However, it can still stretch or fail under certain conditions, such as poor maintenance or oil starvation.

Maintenance:

• Timing Belt: Requires periodic inspection and replacement as part of routine maintenance. Neglecting this can lead to catastrophic engine damage.
• Timing Chain: Requires less frequent maintenance but should be checked for tension and wear during major engine services.

Noise:

• Timing Belt: Typically quieter than a timing chain, as it operates smoothly without metal-on-metal contact.
• Timing Chain: Can be noisier due to metal contact, especially if it becomes loose or worn.

Cost:

• Timing Belt: Generally less expensive to manufacture and replace, but costs can add up if other components like tensioners or water pumps are replaced simultaneously.
• Timing Chain: More expensive due to its complexity and the labor involved in accessing it, as it is often located inside the engine.

Consequences of a Broken Timing Belt

Engine Damage:

In interference engines, a broken timing belt can lead to severe engine damage. The pistons and valves can collide, bending valves, damaging pistons, and potentially ruining the cylinder head or even the entire engine.

Loss of Engine Power:

The engine will stop running immediately if the timing belt breaks, leading to a complete loss of power. This can be dangerous if it occurs while driving, especially at high speeds or in heavy traffic.

Costly Repairs:

Repairing the damage caused by a broken timing belt can be very expensive. It may require a complete engine rebuild or replacement, depending on the extent of the damage.

Stranded Vehicle:

A broken timing belt will leave the vehicle inoperable, potentially stranding the driver until the car can be towed and repaired.

Preventive Measures:

Regular maintenance and timely replacement of the timing belt can prevent these issues. It's crucial for vehicle owners to adhere to the manufacturer's maintenance schedule to avoid unexpected failures.

Timing Belt Maintenance Awareness

As timing belts became more common, the importance of regular maintenance and replacement became clear. Manufacturers began specifying replacement intervals to prevent catastrophic engine damage due to belt failure.

Tucked behind the timing cover, a visual inspection of your timing belt can sometimes prove difficult, not to mention issues with access. So when it comes to installing a new timing belt, the most cost effective method is to replace components that are also buried deep in the engine bay such as the water pump.

Timing Belt Replacement

Dependant on vehicle, complexity, and timing belt location the time taken to replace a timing belt can vary greatly. A labour charge on top of the cost of the timing kit can be anywhere from $500 to $1500 so if you have the competancy to change this yourself you can save significantly.

Repco stock hundreds of timing belt kits containing both timing components and water pumps to enable you to replace all necessary parts at the same time. By replacing all components at the same time ensures both your cooling system as well as your timing system is in top condition.

To find the right timing belt for your vehicle use our handy Rego search function and enter your vehicle details. From oil seals, timing belt or chain, belt tensioner to a multitude of accessories, many of our kits comprise various configurations of parts so you get exactly what you need to do your repairs. If you need any addition help or for more information, contact your local store and our customer service team will endeavour to help.

Repco stock the best in timing belt kits and components for your vehicle

As well as timing kits we stock the engine tools, timing components and drive belt tensioners to ensure your vehicle runs in perfect condition. No matter what type of car you drive - whether it's a 4WD, an SUV or a hatchback we have the right timing kits to suit your needs and budget.