Dayco Accessory Drive Belt Tensioner Assembly 89384
Dayco Accessory Drive Belt Tensioner Assembly 89384 - view 2
Dayco Accessory Drive Belt Tensioner Assembly 89384
Dayco Accessory Drive Belt Tensioner Assembly 89384 - view 2

Dayco Accessory Drive Belt Tensioner Assembly P/N:89384

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$71.99
MPN: 89384
Item Package Quantity: 1
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Dayco Accessory Drive Belt Tensioner Assembly P/N:89384
Dayco Accessory Drive Belt Tensioner Assembly P/N:89384
$71.99

Keep the serpentine belt properly tensioned with the Dayco drive belt tensioner assembly, part number 89384. This automatic tensioner uses internal spring load to take up belt slack and hold consistent tension across the accessory drive, helping the belt track and grip the pulleys as designed. It installs as a direct-fit replacement for the listed applications, including the 2005-2019 Nissan Frontier, 2005-2012 Nissan Pathfinder, 2005-2015 Nissan Xterra, 2017-2024 Nissan Titan, and 2009-2012 Suzuki Equator — see the Buyer's Guide tab for the full list.

  • Automatic tensioner: self-adjusting design that maintains belt tension without manual adjustment.
  • Rotation: clockwise direction.
  • Pulley: single pulley with a 76 mm diameter, 28 mm width, and a flat pulley face.
  • Belt type: serpentine.
  • Country of origin: United States.

A worn serpentine belt tensioner may show up as belt squeal, chirping, visible belt flutter, or a rattling noise from the tensioner arm — signs the assembly may need replacing. One tensioner is used per application. If the tensioner is the cause of these symptoms, this unit replaces it.

Interchange: 780298 · 38378 · 49394 · 999172A

This part cross-references / interchanges with the following part numbers:

780298, 38378, 49394, 999172A, 11955-EA200, 11955-EA20A, 11955-EA20B, 17540-82Z00, 17540-82Z20

Frequently Asked Questions

What is the Dayco 89384 and what does it do?

It is an automatic accessory drive belt tensioner assembly. It applies internal spring load to the serpentine belt, taking up slack and holding steady tension so the belt tracks and grips the accessory pulleys as designed.

Will this serpentine belt tensioner fit my vehicle?

It is a direct-fit replacement for the listed applications, such as the 2005-2019 Nissan Frontier, 2012-2021 Nissan NV1500/NV2500/NV3500, and 2017-2024 Nissan Titan. Check the Buyer's Guide tab to confirm your exact year, model, and engine.

Which engines does the 89384 cover?

The listed applications use the V6-4.0L or V8-5.6L engines. Confirm your specific engine against the Buyer's Guide tab before ordering.

What are the signs of a failing belt tensioner?

Common signs include belt squeal or chirping, visible belt flutter, and a rattle from the tensioner arm. These may point to a worn tensioner; diagnose the cause before replacing.

How many tensioners do I need?

The listed applications use one tensioner each, and this listing is for one assembly. Order one unit per vehicle.

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