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Dayco 89842 No Slack Idler Tensioner Pulley

(2004-2009 Audi S4; 2007-2010 Audi Q7; 2005-2011 Audi A6 Quattro; 2007-2010 Audi A8 Quattro; 2008-2012 Audi S5; 2007-2009 Audi S8 + 4 more models)

Part of: Dayco No Slack Idler Tensioner Pulley

Other options in this family: Dayco 89018 Dayco 89015 Dayco 89826 Dayco 89009

Manufacturer

Picture for manufacturer Dayco

Part Number

89842
8 reviews
Sale Price

$35.61

2 left at this price

delivery box

Usually delivered within 2 days

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No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Dayco 89842 is a No Slack® idler/tensioner pulley engineered to deliver OE-quality performance in accessory drive belt systems. Designed as a direct-fit replacement, this pulley is built to meet or exceed original equipment specifications for reliable, long-lasting service.

Key Features:

  • No Slack® Engineering: Precision-machined surfaces and tight dimensional tolerances reduce vibration and extend belt life
  • Lifetime Lubricated Ball Bearings: Pre-lubricated sealed bearings deliver consistent performance throughout the service life of the pulley
  • Double High-Temperature Seals: Dual seals protect bearing integrity under extreme underhood heat conditions
  • 3D Computer-Aided Design: Each pulley is developed using CAD and finite element analysis to ensure maximum structural integrity and precise fitment
  • OE-Quality Construction: Built with glass-filled polymer or steel construction (depending on application) for strength, reduced heat buildup, and wear resistance

The Dayco 89842 is part of Dayco's industry-leading pulley program, backed by over 2,500 hours of design, development, and testing. It is a trusted direct-replacement component for maintaining proper belt routing, tension, and alignment in serpentine belt drive systems.

Products specifications

Fits

2004-2009 Audi S4; 2007-2010 Audi Q7; 2005-2011 Audi A6 Quattro; 2007-2010 Audi A8 Quattro; 2008-2012 Audi S5; 2007-2009 Audi S8; 2007-2011 Audi S6; 2004-2005 Audi Allroad Quattro; 2008-2012, 2014-2015 Audi R8; 2007-2009 Volkswagen Touareg

Came quick!

Item was delivered on a pallet that appeared to have had a lot of care !

Quick delivery and product is looking good but have not installed yet.

Package was shipped out very fast. The packaging and materials were very good.

Price was higher than others but it was in stock and checkout was easy soni guess it's a wash

Easy payment for Apple Pay

good

Quick and easy!

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