Help keep every engine accessory spinning with the Dayco accessory drive belt tensioner assembly, MPN 89304. This automatic belt tensioner assembly maintains the correct tension on the serpentine belt, taking up slack and damping vibration so the belt drives the alternator, water pump, and other accessories without slipping. It installs as a direct-fit replacement for many vehicles, including the 1999-2005 Hyundai Sonata 2.5L / 2.7L, 2005-2009 Hyundai Tucson 2.7L, and 2001-2006 Kia Optima 2.5L / 2.7L — see the Buyer's Guide tab for the full list.
A worn tensioner can show up as belt squeal, chirping, rapid belt wear, or a rattle from the tensioner. If a failed tensioner is the cause, this Dayco drive belt tensioner replaces it.
Interchange: 419-023
419023 · 38149 · 49019 · 49273 · 45851 · 5851 · 900021A · 999028A
This part cross-references / interchanges with the following part numbers:
What is a serpentine belt tensioner and what does it do?
It is a pulley assembly that keeps constant tension on the serpentine belt, taking up slack and damping vibration so the belt drives the engine accessories without slipping.
Does the Dayco 89304 fit my Hyundai or Kia?
It is a direct-fit replacement for vehicles such as the 1999-2005 Hyundai Sonata 2.5L / 2.7L, 2005-2009 Hyundai Tucson 2.7L, and 2001-2006 Kia Optima 2.5L / 2.7L. Check the Buyer's Guide tab for the full list.
What are the signs my belt tensioner may need replacing?
Common signs include belt squeal or chirping, rapid belt wear, and a rattle from the tensioner. Diagnose the cause first, since these symptoms can also come from other belt-drive components.
Is this an automatic tensioner?
Yes. It is an automatic-type tensioner, so it self-adjusts to maintain the correct tension on the serpentine belt across the listed engines.
What size is the pulley on this tensioner?
It has a single flat pulley measuring 82 mm in diameter and 26 mm wide, and it is built for counter-clockwise rotation on the listed applications.
WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
