Heavy Duty Accessory Drive Components
Accessory drive belt components for heavy duty applications.
Ideal for diesel, fleet, and work vehicles, Cloyes heavy-duty accessory drive components include high-load tensioners, idler pulleys, and drive belts.
Industry-Leading Support
Each heavy-duty accessory drive component is backed by Cloyes’ warranty and dedicated technical support for hassle-free performance.
OE-Quality
Need precise alignment? Our heavy-duty accessory drive components are engineered to fit your specific engine for optimal performance.
For when durability is everything.
Heavy Duty Accessory Drive Pulley
These heavy-duty accessory drive components are built for strength, balance, and lasting durability. They help control vibrations and day-to-day wear.
High-durability spring technology is available in both round and flat spring types.
Advanced bearing systems help enhance dust and moisture resistance.
Each pulley is designed to offer quick and easy installation.
Heavy Duty Belt Tensioner
Crafted to handle the constant demands of heavy-duty engines, Cloyes HD Tensioners feature high-fatigue springs, corrosion-resistant coatings, and OE-level fit.
High-durability round or flat springs included depending on the application.
Advanced corrosion protection helps ensure long-lasting performance.
Triple-sealed bearings resist dust, water, and wear in the harshest conditions.
Engineered for real-world heavy-duty conditions.
Cloyes heavy-duty accessory drive components help keep your heavy-duty engine systems running smoothly, quietly, and reliably.
100+
Years of innovation and team experience.
OE-Quality
Fit, form, and function.
Technical SupporT
Warranty and technical support from our team.
The knowledge behind the repair.
Explore technical resources, installation guidance, and product videos developed to help technicians approach engine repairs with confidence.
Tech Video
Tech Video
Tech Byte: Don’t Pull the Pin Too Early on Serpentine Belt Tensioners
Learn why timing is everything when pulling the pin and how to ensure a perfect belt alignment every time.
dont-pull-the-pin-too-early-on-serpentine-belt-tensioners
February 5, 2026
Tech Video
Tech Video
Tech Byte: Using a Tensioner Pin Release
Don't force it! Learn how to properly use a tensioner pin release to avoid damaging your belt or tensioner during installation.
using-a-tensioner-pin-release
February 5, 2026
Tech Video
Tech Video
Tech Byte: STOP Reusing This Bolt! (Costly Mistake)
Stop a costly mistake! Learn why you must use the new mounting bolt with your belt tensioner to avoid strain and fitment issues.
stop-reusing-this-bolt-costly-mistake
February 5, 2026
Tech Center
Looking to add a specific heavy-duty accessory drive component?
Use the links below to search our part finder or see where our team’s products are sold near you.
FAQs
Find answers to common questions we receive about our heavy-duty accessory drive components.
Contact UsWhat’s included in a Cloyes timing chain kit?
Kit contents vary by part number and application. Base Kits generally include timing chains, tensioners, and guides and may include sprockets and application-specific hardware. Expanded configurations may add VVT phasers and solenoids, a water pump, or front engine accessory drive components. Review the individual product listing to confirm exactly what is included.
What is the difference between a timing chain kit and a timing belt kit?
Both systems synchronize the crankshaft and camshaft, but they use different components. A timing chain system uses metal chains and sprockets, while a timing belt system uses a reinforced toothed belt. Timing belts commonly have application-specific inspection or replacement intervals. Timing chain service is generally based on system condition, diagnosis, and vehicle manufacturer guidance.
Should I use a timing kit or replace an individual component?
That depends on the application, the condition of the timing system, and the scope of the repair. A kit brings together multiple components for a broader timing system service, while individual components support more targeted repairs. Inspect the complete system and follow the service information for the specific vehicle and engine.
Where can I find installation instructions for my Cloyes timing kit?
For installation guides and videos, head to our Tech Center! Search the Cloyes Tech Center for installation instructions, technical videos, and application-specific resources. You can also contact Cloyes Technical Support if you need additional help with a product or installation.
Does Cloyes offer VVT timing components?
Yes. Our award-winning innovation includes Variable Valve Timing components that offer unmatched precision and engine performance. Cloyes offers VVT phasers, solenoids, sprockets, related hardware, and VVT-inclusive timing kits for a broad range of applications. Use the Cloyes Part Finder to check available products for a specific year, make, model, and engine.
