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Dayco 89842 Accessory Drive Belt Idler Pulley
| Brand | Dayco 89842 |
|---|---|
| Product line | Idler Pulley |
| Fits | Audi and Volkswagen · 46 vehicles |
OE-style replacement. Accessory drive belt idler pulley for belt routing and tension management.
Broad European coverage. Cataloged for select Audi and Volkswagen belt drive applications.
Accessory Drive Idler Pulley
Dayco 89842 is an accessory drive belt idler pulley for select Audi and Volkswagen applications. It is listed for multiple V8 and quattro fitments, including Audi R8, Audi S5, and Audi A6 Quattro models, with coverage that spans several model years.
Key Features
- Accessory drive belt idler pulley for belt routing and tension management.
- Fits select Audi and Volkswagen applications with idler pulley notes in the catalog data.
- Dayco 89842 supports a broad range of premium European vehicle fitments.
- Catalog fitment includes Audi R8, Audi S4, Audi S6, Audi S8, Audi A8 Quattro, Audi Q7, Audi Allroad Quattro, Audi A6 Quattro, Audi S5, and Volkswagen Touareg.
Detailed Description
Dayco 89842 is an accessory drive belt idler pulley used in the belt drive system to guide the serpentine belt along its path. This part number appears across multiple Audi and Volkswagen platforms, including 2004-2009 Audi S4, 2007-2011 Audi A6 Quattro, 2008-2012 Audi S5, and 2007-2009 Volkswagen Touareg applications. If you are replacing a worn idler pulley on an Audi A6 Quattro or Audi R8, this catalog listing provides a direct reference point for the correct belt system component.
This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.
What It Is Used For
- Replacing a noisy or rough idler pulley in the accessory drive system.
- Restoring proper belt tracking when the pulley surface is worn.
- Addressing belt squeal caused by pulley bearing wear.
- Correcting belt routing issues related to a damaged pulley.
Installation Notes and Tips
Verify the vehicle year, make, model, and belt system configuration against the catalog fitment before ordering. Confirm the pulley location and compare the existing part number 89842 to the removed component for an accurate match. Professional installation is recommended for accessory drive belt service.
Quality Assurance
Dayco supplies belt drive system components for automotive service applications, and this part is cataloged under Dayco 89842 for fitment verification.
| Year | Make | Model | Liters | Cylinders | Notes |
|---|---|---|---|---|---|
| 2015 | Audi | R8 | 4.2L | V8 | Idler Pulley |
| 2014 | Audi | R8 | 4.2L | V8 | Idler Pulley |
| 2012 | Audi | R8 | 4.2L | V8 | Idler Pulley |
| 2012 | Audi | S5 | 4.2L | V8 | Idler Pulley |
| 2011 | Audi | A6 Quattro | 4.2L | V8 | Idler Pulley |
| 2011 | Audi | R8 | 4.2L | V8 | Idler Pulley |
| 2011 | Audi | S5 | 4.2L | V8 | Idler Pulley |
| 2011 | Audi | S6 | — | — | Idler Pulley |
| 2010 | Audi | A6 Quattro | 4.2L | V8 | Idler Pulley |
| 2010 | Audi | A8 Quattro | 4.2L | V8 | Idler Pulley |
| 2010 | Audi | Q7 | 4.2L | V8 | Idler Pulley |
| 2010 | Audi | R8 | 4.2L | V8 | Idler Pulley |
| 2010 | Audi | S5 | 4.2L | V8 | Idler Pulley |
| 2010 | Audi | S6 | — | — | Idler Pulley |
| 2009 | Audi | A6 Quattro | 4.2L | V8 | Idler Pulley |
| 2009 | Audi | A8 Quattro | 4.2L | V8 | Idler Pulley |
| 2009 | Audi | Q7 | 4.2L | V8 | Idler Pulley |
| 2009 | Audi | R8 | 4.2L | V8 | Idler Pulley |
| 2009 | Audi | S4 | — | — | — |
| 2009 | Audi | S5 | — | — | Idler Pulley |
| 2009 | Audi | S6 | — | — | Idler Pulley |
| 2009 | Audi | S8 | — | — | Idler Pulley |
| 2009 | Volkswagen | Touareg | 4.2L | V8 | Idler Pulley |
| 2008 | Audi | A6 Quattro | 4.2L | V8 | Idler Pulley |
| 2008 | Audi | A8 Quattro | 4.2L | V8 | Idler Pulley |
| 2008 | Audi | Q7 | 4.2L | V8 | Idler Pulley |
| 2008 | Audi | R8 | — | — | Idler Pulley |
| 2008 | Audi | S4 | — | — | — |
| 2008 | Audi | S5 | — | — | Idler Pulley |
| 2008 | Audi | S6 | — | — | Idler Pulley |
| 2008 | Audi | S8 | — | — | Idler Pulley |
| 2008 | Volkswagen | Touareg | 4.2L | V8 | Idler Pulley |
| 2007 | Audi | A6 Quattro | 4.2L | V8 | Idler Pulley |
| 2007 | Audi | A8 Quattro | 4.2L | V8 | Idler Pulley |
| 2007 | Audi | Q7 | 4.2L | V8 | Idler Pulley |
| 2007 | Audi | S4 | — | — | — |
| 2007 | Audi | S6 | — | — | Idler Pulley |
| 2007 | Audi | S8 | — | — | Idler Pulley |
| 2007 | Volkswagen | Touareg | 4.2L | V8 | Idler Pulley |
| 2006 | Audi | A6 Quattro | 4.2L | V8 | — |
| 2006 | Audi | S4 | — | — | — |
| 2005 | Audi | A6 Quattro | 4.2L | V8 | — |
| 2005 | Audi | Allroad Quattro | 4.2L | V8 | — |
| 2005 | Audi | S4 | — | — | — |
| 2004 | Audi | Allroad Quattro | 4.2L | V8 | — |
| 2004 | Audi | S4 | — | — | — |
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