Parts for your 2017 Toyota Avensis

The Role and Maintenance of the Timing Belt in a 2017 Toyota Avensis

The 2017 Toyota Avensis is a reliable and popular vehicle across Australia, well-regarded for its blend of performance and efficiency. One key component that plays a vital role in the engine's operation is the timing belt. However, it's important to clarify whether a timing belt is actually used in this model. For the 2017 Avensis, Toyota fitted the majority of its engines with a timing chain rather than a timing belt. This is an important distinction that impacts maintenance routines and costs for owners.

So why does the 2017 Toyota Avensis not use a timing belt? Toyota opted for timing chains in their Avensis lineup principally because timing chains are more durable and generally last the life of the engine. Unlike a timing belt, which is made from rubber and composite materials, a timing chain is a metal chain that operates inside the engine, lubricated by engine oil. This design choice reduces the need for regular replacement intervals that timing belts demand.

Timing belts typically require replacement approximately every 90,000 to 120,000 kilometres to prevent the risk of belt failure, which can cause serious engine damage. On the other hand, timing chains are designed to be a lifetime part, though they can wear under harsh conditions or due to poor maintenance. The use of a timing chain on the 2017 Avensis aligns with Toyota's reputation for building long-lasting and low-maintenance vehicles.

Though the timing chain does not require scheduled replacement like a timing belt, it still plays the crucial role of synchronising the rotation of the crankshaft and camshaft. This synchronisation ensures that the engine's valves open and close at the right times during the intake and exhaust strokes, allowing the engine to run smoothly and efficiently. A failure or significant wear of the timing chain can lead to engine misfires, rough idling, or in extreme cases, catastrophic engine damage. Therefore, while replacement isn't a routine service item for the Avensis, there is still maintenance to keep an eye on.

Maintenance of the timing chain largely revolves around maintaining good engine oil quality and checkups. Since the timing chain is lubricated by engine oil, regular oil changes using the recommended grade and specification are essential to ensure the chain stays well-lubricated and free from excessive wear. Dirty or old engine oil can accelerate timing chain wear and cause other issues such as chain stretch or tensioner failure.

Alongside the timing chain itself, associated components such as the timing chain tensioner, guides, and sprockets also deserve attention. The timing chain tensioner keeps the chain tight, preventing slack that can lead to rattling noises or timing issues. If these components become worn or damaged, symptoms like unusual rattling sounds from the engine's timing cover area could appear. The 2017 Toyota Avensis owners should have these components inspected during routine servicing if they notice such symptoms or if the vehicle has accumulated very high mileage.

Automotive technicians recommend inspection of the timing chain and its components at higher kilometre intervals, typically beyond 150,000 kilometres, or if there are signs of engine performance problems. If wear or damage is detected, replacement is usually necessary. While this can be a labour-intensive and therefore costly repair compared to timing belts, it is less frequently required and ensures the engine continues operating reliably.

For most 2017 Toyota Avensis owners, driving within normal operating conditions and adhering to scheduled oil changes every 10,000 to 15,000 kilometres is sufficient to maintain the timing chain system in great shape. Toyota's design and engineering mean that most timing chain issues are rare and something you don't have to worry about regularly, especially compared to older vehicles that relied on timing belts.

In a nutshell, the 2017 Toyota Avensis does not use a timing belt but rather a timing chain. This decision helps the car maintain its reputation for reliability and lower maintenance costs over time, as timing chains do not require routine scheduled replacements like timing belts do. Owners should still monitor engine oil health closely, attend regular servicing, and watch for any clues of timing chain wear such as rattling noises or engine misfires. Proper maintenance will help ensure the timing chain system performs its essential function of keeping the engine's timing spot on for a long time.

Whether new or used, the Avensis is a smart choice for drivers looking for a dependable car with sensible engineering choices that keep ongoing maintenance manageable. Understanding the role of the timing chain and how it differs from a timing belt can put owners at ease knowing that the car's engine timing is in good hands as long as basic servicing is not overlooked.