Parts for your 2018 Subaru Impreza-Centre bearing

Centre Bearing on the 2018 Subaru Impreza: Is It Used and What You Should Know

When it comes to the 2018 Subaru Impreza, many drivers and enthusiasts often wonder if a centre bearing is part of the drivetrain setup. After digging into technical sources and the car's design features, it's clear that the 2018 Subaru Impreza does not use a centre bearing. This might surprise some, especially those familiar with vehicles that have long driveshafts requiring extra support. So, why doesn't the 2018 Impreza need one, and what does that mean for maintenance? Let's break it down.

The centre bearing is typically found in vehicles fitted with a two-piece driveshaft arrangement to support the driveshaft where it spans a long distance from the transmission or transfer case to the rear differential. The bearing acts as a support point fixed to the chassis, allowing the driveshaft segments to spin smoothly without bending or excessive vibration. It's a common feature in rear-wheel drive vehicles or all-wheel drives with a longitudinal engine and separate drivetrain components spread out across the car's length.

Now, the 2018 Subaru Impreza is built on Subaru's well-known global platform that features a boxer engine mounted horizontally at the front and a symmetrical all-wheel-drive system. The layout is pretty compact, and the drivetrain components are designed to be closely integrated. Instead of using a long metal driveshaft that needs intermediate support, the Impreza uses a simpler, more direct setup where the rear drivetrain elements are close enough to the front. This eliminates the need for a centre bearing.

Because of this design, the driveshaft or propeller shaft in the Impreza is not a two-piece assembly, which is where centre bearings typically come into play. Subaru's engineering for this model opts for durability and simplicity in the AWD system, allowing for fewer moving parts and thus less ongoing maintenance complexity related to bearings of this type.

If a centre bearing were fitted to the 2018 Subaru Impreza, it would primarily serve to reduce vibration, provide support to prevent shaft sagging, and extend the lifespan of the driveline components. It would work by clamping around the shaft, allowing it to rotate freely while being fixed snugly to the chassis. A worn or failed centre bearing could cause driveline noise, vibrations felt throughout the cabin, and even accelerated wear on other drivetrain components due to misalignment or imbalance.

Since the centre bearing is not part of this vehicle, Subaru drivers do not need to worry about the typical issues centre bearings face, such as bearing wear, rubber bushing breakdown, or lubrication failure. This also means there's no regular centre bearing inspection or replacement service item listed in the Impreza's maintenance schedule.

For those who may be unaware, it can help to understand what typical warning signs would signal a failing centre bearing on vehicles that do have one. These include:

• Vibration at certain speeds, usually felt in the floor or seat.
• Unusual noises such as whining, squeaking or clunking coming from underneath the car.
• Visible wear or cracking on the rubber bushing of the bearing support.
• Play or looseness in the centre bearing assembly when the driveshaft is moved manually.

In the 2018 Subaru Impreza, if any drivetrain vibration or noise arises, technicians would usually look at other components like CV joints, wheel bearings, or the differential rather than a centre bearing. It's the layout that fundamentally makes the bearing redundant. This design choice speaks to Subaru's focus on reliability and ease of maintenance, giving Impreza drivers peace of mind when it comes to the undercarriage components.

While the Impreza's non-use of a centre bearing simplifies things, it doesn't mean drivers don't have any drivetrain maintenance responsibilities. Regular checks of CV joints and boots, differential fluid levels, and general drivetrain lubrication remain important to keep the car running smoothly. Maintaining correct wheel alignment and tyre pressures also assists in reducing stress and vibration through the driveline.

So, if a driver is curious about centre bearing upkeep on their 2018 Subaru Impreza, it can be reassuring to know that their particular vehicle architecture skips this component altogether. There's simply no centre bearing to wear out or replace, which is a small but notable plus when it comes to long-term maintenance costs and hassle. This highlights how certain engineering choices impact not just performance but also serviceability in everyday vehicles.