Belt Fan and Alternator.
Serpentine Belt.

• Transmits power through and to the alternator, power steering pump, and A/C compressor
• Also known as a fan or accessory belt
• Replace when cracked, frayed, peeling, or malfunctioning

Your INFINITI engine relies on a variety of intricate, interrelated parts that help you enjoy that smooth INFINITI ride you love! Many of these Engine components connect via a series of belts, one of which is called the Serpentine Belt.

The Serpentine Belt is a sturdy, cyclical strap that conduct power through and to the alternator, power steering pump, car A/C compressor, and, in some models, the water pump. Some people refer to the Serpentine Belt as a fan or accessory belt because it engages your INFINITI engine's peripheral devices. However, that simple reference doesn't make it any less important.

INFINITI Serpentine Belts are typically made of reinforced rubber manufactured to withstand the challenges involved in transporting power from one engine component to the other. But, like all good things, even Serpentine Belts don't last forever!

Serpentine Belts can tear or crack with age, or they can act up if soaked with oil or coolant. They can also lose alignment, slip, or lack tension, because of malfunctioning tensioning systems, which may result in needing to replace both the tensioner and the Serpentine Belt, or simply re-tensioning the belt, if it's still in working order. Some symptoms of Serpentine Belt problems are: engine rattling noises, lackluster A/C or power steering performance, engine overheating, and visible cracks or wear on the belt.

Generally, your INFINITI Serpentine Belt can last many thousands of miles, but its useful life can be shortened due to coolant leaks, oil leaks, and old tensioners. It's a good idea to inspect your Serpentine Belt during every oil change, or get a professional inspection from an INFINITI service center in your area.

The Serpentine Belt replacement procedure is dependent on the tensioner mechanism in your INFINITI. Consult with an expert technician or your INFINITI manual before DIY-ing any services!

Unsurprisingly, you'll need a Serpentine Belt that's designed-to-fit your model and year, and an adequate belt tensioner. Note that if your INFINITI relies on a manual or hydraulic tensioner for the Serpentine Belt, visiting your nearest INFINITI service center is advisable.

When you're ready to get started, take pictures of the placement of your current Serpentine Belt and of how it intertwines with other engine components. Then, detach the tensioner using a ratchet and gently unwind the Serpentine Belt, avoiding displacing any pulleys or accessories.

Once the old Serpentine Belt is out, check it for signs of engine oil or coolant leaks, tears, and breakage to pinpoint issues that go beyond-the-belt! Thread the new Serpentine Belt back into place and release the tensioner, using a wrench to tighten it to the appropriate level. Lastly, crank the engine and allow it to idle while inspecting its operation to ensure it runs smoothly.

Whether you choose to DIY your INFINITI Serpentine Belt replacement or visit an authorized INFINITI service center, getting the right parts for the job is vital! Buy an authentic Serpentine Belt replacement made-to-fit your INFINITI model and year directly from INFINITI Parts & Accessories! Order a genuine replacement Engine Serpentine Belt for your INFINITI QX50. See the What This Fits tab for more details.

Fits QX50, QX55