Parts for your 2017 Subaru Legacy

The Role and Maintenance of the Timing Belt in a 2017 Subaru Legacy

When chatting about maintenance and key components on a 2017 Subaru Legacy, it's worth noting that this particular model does not use a timing belt. Instead, Subaru opts for a timing chain in this vehicle. This distinction is quite important because it impacts not only maintenance routines but also the overall reliability and lifespan of certain engine parts.

So why doesn't the 2017 Subaru Legacy have a timing belt? The answer lies in the engine design Subaru favours. The 2017 Legacy commonly comes with the 2.5-litre flat-four boxer engine or the 3.6-litre flat-six boxer engine, both of which utilise timing chains. Timing chains are constructed from metal links, quite a bit stronger and more durable than the rubber-based timing belts found in many other cars. This naturally means fewer replacements and generally less hassle over the life of the car.

Timing belts are typically found in many other vehicles because they are quieter and lighter. However, they require regular replacement, usually every 60,000 to 100,000 kilometres, depending on the manufacturer's recommendation. Failing to replace a worn timing belt can lead to catastrophic engine damage, as the belt controls the synchronisation between the engine's crankshaft and camshaft(s). If the belt snaps, valves can collide with pistons, resulting in costly repairs.

Subaru's choice to use timing chains in the Legacy offers some distinct advantages. Unlike timing belts, timing chains are located inside the engine and lubricated by engine oil, which helps them last much longer. They do not demand scheduled replacement as part of normal maintenance in most cases, which is a relief for many owners. Essentially, timing chains are designed to last the lifetime of the engine, assuming the car is properly maintained.

Even though the timing chain in a 2017 Subaru Legacy is considered a 'fit and forget' part, it's not entirely maintenance-free. Over time and with high mileage, timing chains can stretch or become noisy if the associated components such as tensioners or guides wear out. Regular servicing and oil changes play a crucial role in prolonging the life of the timing chain, as clean engine oil helps keep the chain well-lubricated and functioning smoothly.

If a timing chain issue arises, it usually manifests as a rattling noise from the engine, particularly during start-up or idling. This is a sign that the tensioner could be failing or that the chain has stretched, which reduces engine timing precision. In such cases, it's advisable to visit a trusted mechanic who can inspect the timing chain assembly and related parts to prevent any further damage to the engine.

When it comes to servicing the timing chain on a Subaru Legacy, the most important thing drivers can do is stick to regular oil and filter changes. Subaru recommends following a maintenance schedule that generally calls for engine oil changes every 6,000 to 10,000 kilometres, depending on driving conditions. Using high-quality oil and genuine filters can make a noticeable difference in ensuring the timing chain and its components stay in top shape.

Because the timing chain is internal and lasts a very long time, Subaru doesn't include replacement intervals for this part in their standard maintenance guide. That being said, keeping an eye and ear out for any strange engine noises or performance dips is always good practice. By addressing minor issues early, owners can avoid the expensive repairs associated with neglected timing chains or their support parts.

For anyone owning or thinking of buying a 2017 Subaru Legacy, it's reassuring to know that you won't have to worry about a timing belt replacement service, which can be quite labour-intensive and pricey. Instead, the timing chain design means less hassle and potentially lower running costs over time.

In short, while the timing chain in a 2017 Subaru Legacy may not require routine replacement like a timing belt, it still benefits greatly from consistent, quality servicing practices. Following Subaru's recommended service intervals, using quality oil, and listening out for any unusual noises will help keep your engine running smoothly for many kilometres to come. It's just one way Subaru's thoughtful engineering aims to provide owners with peace of mind and a dependable driving experience.