Quick Answer

On certain early VR30DDTT-equipped Q50 and Q60 vehicles, Infiniti published a procedure for an accessory belt that was noisy or came off the idler pulley. The procedure checks belt alignment and, when applicable, A/C-compressor positioning. It applies only to specified vehicles, but it illustrates why the root alignment problem must be checked before installing another belt.

What Belt Symptoms Should Q50 Owners Notice?

A belt problem may begin as chirping or squealing at startup, at a certain rpm, or when the A/C engages. Visible warning signs include frayed edges, missing ribs, glazing, rubber dust, a belt riding near the edge of a pulley, or a belt that has partially or completely come off.

If the belt leaves its normal path, it can damage nearby parts and stop driving accessories from operating correctly. A battery warning, loss of A/C performance, or sudden new noise should be investigated instead of repeatedly restarting the car.

What Does the Infiniti Belt Bulletin Cover?

Infiniti service bulletin ITB17-004a addresses a noisy accessory drive belt or a belt that came off the idler pulley on specified 2016–2017 Q50 and 2017 Q60 vehicles with the VR30DDTT engine. It includes VIN and production-date limits and does not apply to every Q50.

The procedure measures belt alignment and may direct A/C-compressor realignment. Owners should not assume that the bulletin applies based on model name alone. The VIN, production date, engine, and current hardware must match.

What Else Can Cause Belt Noise or Damage?

Normal belt wear, incorrect tension, a weak tensioner, rough idler bearing, pulley damage, fluid contamination, debris, or an incorrectly installed component can all affect tracking. Oil or coolant on the belt may signal a separate leak that must be corrected.

A new belt can become noisy again when the pulley plane is wrong or a bearing is beginning to seize. Inspecting every driven component and the full belt path is more useful than treating the belt as the only failed part.

How Is the Q50 Belt System Inspected?

The engine is kept off while the belt condition and routing are checked. A technician inspects the ribs and edges, tensioner position and movement, pulley alignment, bearing feel, contamination, and evidence that the belt has walked sideways.

When the applicable Infiniti procedure is relevant, its measurement method is used to determine whether alignment correction is necessary. If the belt came off, collateral damage is assessed before the system is returned to service.

Is It Safe to Drive With a Squealing Belt?

A brief noise still deserves inspection because a belt can deteriorate quickly after it begins tracking incorrectly. Do not continue driving if the belt is visibly displaced, strands are separating, a pulley is wobbling, the battery light appears, or the noise becomes harsh.

Shut the engine off if loose belt material is striking other components. Never reach into the belt area with the engine running, and do not use spray dressings that can mask noise or contaminate the belt.

Q50 Belt Inspection in Hiram, Smyrna, and Woodstock

Fastlane can inspect Infiniti accessory-belt noise and related charging, A/C, or pulley concerns at all three locations. Note whether the sound changes with engine speed, temperature, or A/C operation and whether the belt has been replaced before.

Schedule online for Infiniti service or review Fastlane's belt replacement information. The inspection should identify why the belt is noisy or moving before a replacement is considered complete.