Keep the accessories on your engine's belt drive spinning smoothly and quietly with the Hayden Accessory Drive Belt Idler / Tensioner Pulley (MPN 5979). This smooth, back-side idler rides against the accessory drive belt to guide its routing and help maintain proper tension, so the belt tracks correctly across the driven accessories. It's a direct-fit replacement for many vehicles, including the 2002-2010 Ford F-150 [V8-4.6L], 2008-2017 Honda Accord [V6-3.5L], and 2005-2010 Ford Mustang [V8-4.6L] — see the "Vehicles it fits" section for the full list.
A worn idler often gives itself away with bearing whine or grinding, chirping, or a squeal from the belt drive — signs this pulley may need replacing.
- Steel construction: built for durable service in the belt drive.
- Smooth, grooveless face: a back-idler design that contacts the flat side of the belt.
- 30 mm pulley width: a single mounting hole for installation.
- Backed by Hayden: over 45 years of automotive cooling experience.
Helps keep the belt properly routed and tensioned to reduce slip and noise. Mounting hardware is not included — consult the vehicle service information for the correct fasteners and whether they may be reused. Country of origin: China.
Frequently Asked Questions
What does the Hayden 5979 do?
It's an accessory drive belt idler / tensioner pulley. The smooth, back-side pulley guides the belt and helps maintain tension so it tracks correctly across the engine's driven accessories.
What are the signs this pulley may need replacing?
Bearing whine or grinding, chirping, or a squeal from the belt drive can point to a worn idler pulley. Diagnose the source first, since belt noise can also come from other components.
Does it include mounting hardware?
No. Mounting hardware is not included — consult the vehicle service information for the correct fasteners and whether they may be reused.
Will this fit my vehicle?
It fits many vehicles, including the 2002-2010 Ford F-150 [V8-4.6L] and 2008-2017 Honda Accord [V6-3.5L]. Check the "Vehicles it fits" section to confirm your exact year, make, model, and engine.
What is the pulley made of and how many do I get?
It features steel construction and measures 30 mm wide with a single mounting hole. This listing is for one pulley; quantity per application is 1.
