Dayco Accessory Drive Belt Tensioner Assembly 89603
Dayco Accessory Drive Belt Tensioner Assembly 89603 - view 2
Dayco Accessory Drive Belt Tensioner Assembly 89603
Dayco Accessory Drive Belt Tensioner Assembly 89603 - view 2

Dayco Accessory Drive Belt Tensioner Assembly P/N:89603

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$113.99
MPN: 89603
Item Package Quantity: 1
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Dayco Accessory Drive Belt Tensioner Assembly P/N:89603
Dayco Accessory Drive Belt Tensioner Assembly P/N:89603
$113.99

Keep every belt-driven accessory turning quietly with the Dayco Accessory Drive Belt Tensioner Assembly (P/N 89603). This spring-loaded tensioner applies steady force to the accessory drive belt, taking up slack and helping maintain proper tension so the belt tracks correctly across the pulleys. It installs as a direct-fit replacement for the 2007-2018 Ford Edge, 2011-2019 Ford Explorer, 2009-2019 Ford Flex, 2008-2019 Ford Taurus, 2017-2020 Lincoln Continental, 2009-2016 Lincoln MKS, 2009-2013 Mazda 6, 2007-2015 Mazda CX-9, and more — see the Buyer's Guide tab for the full list of applications.

  • Automatic tensioner assembly: a spring-loaded arm and pulley maintain consistent belt tension without manual adjustment.
  • Reduces belt slack: helps the accessory belt track properly and drive the engine accessories.
  • Direct-fit replacement: designed to replace the original tensioner on the listed applications.

Signs the original tensioner may need replacing include belt squeal or chirp, a rattling or grinding pulley, visible belt slap, or a seized arm. If a worn tensioner is the cause, this assembly replaces it; diagnose the source of the noise before installing.

Interchange: 38485 · 49450 · 999419A · BT4Z6B209B · BT93 · BT97 · Manufacturer part number 89603.

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

38485, 49450, 999419A, BT4Z6B209B, BT93, BT97, 7T4E-6B209-EC, 7T4Z-6B209-AA, 8T4E-6B209-AA, 8T4Z-6B209-A, BT4E-6B209-CB, BT4E-6B209-CC, BT4E-6B209-CD, BT4Z-6B209-A, BT4Z-6B209-B, CY01-15-980A, CY01-15-980B, CY01-15-980C, CY01-15-980D

Frequently Asked Questions

What does this tensioner do?

It uses a spring-loaded arm and pulley to apply steady force to the accessory drive belt, taking up slack and helping the belt maintain proper tension across the pulleys.

Will this fit my vehicle?

It's a direct-fit replacement for applications such as the 2007-2018 Ford Edge, 2011-2019 Ford Explorer, 2008-2019 Ford Taurus, and 2007-2015 Mazda CX-9. Check the Buyer's Guide tab for the full list.

What are signs my tensioner needs replacing?

Belt squeal or chirp, a rattling or grinding pulley, visible belt slap, or a seized arm. Diagnose the cause of the noise before replacing.

What numbers does this part interchange with?

It cross-references 38485, 49450, 999419A, BT4Z6B209B, BT93, and BT97. Its own manufacturer part number is 89603.

Does it require manual adjustment?

No. This is an automatic tensioner assembly; the internal spring maintains belt tension without manual adjustment.

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