Heavy Duty Accessory Drive Kits
Keep your heavy-duty engine turning.
Cloyes heavy-duty accessory drive kits are engineered for the high-demand environments of heavy-duty and commercial vehicles.
Reinforced Construction
Our heavy-duty accessory drive kits include reinforced components to help extend your engine’s life in the toughest road conditions.
OE-Quality
When precise alignment is critical, our heavy-duty accessory drive kits deliver. Each component is engineered to fit your engine.
What comes in a heavy-duty accessory drive kit?
High-Strength Belt
Our fabric-backed or EPDM belts help resist cracking, heat glazing, and high-torque slip in stop-and-go driving, towing, and commercial use.
HD Tensioner
With enhanced spring forces, these heavy-duty accessory drive components maintain optimal belt tension under fluctuating loads for consistency.
Reinforced Pulley
Engineered with heavy-duty materials and sealed bearings, our heavy-duty pulleys are designed to reduce vibration and extend your system’s life.
Benefits of our heavy-duty accessory drive kits.
With over a century of trusted OE-quality engineering, we’ve helped heavy-duty accessory drive systems run smoothly and reliably.
OE-Quality
Fit, form, and function across our kits.
Hassle-Free
Installation to help you complete repairs faster.
Compact Packaging
Protects parts during transit to your location.
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: Unboxing the Front Engine Accessory Drive
Discover what’s inside a Cloyes FEAD kit. Learn how serpentine belts, tensioners, and pulleys work together to prevent breakdowns.
tech-byte-unboxing-the-front-engine-accessory-drive
April 16, 2026
Tech Video
Tech Video
Tech Byte: The General Mileage Ranges for Belt Components
Discover why the 60,000 and 90,000-mile marks are critical for inspections to avoid costly repairs on your accessory drive components.
tech-byte-the-general-mileage-ranges-for-belt-components
May 12, 2026
Tech Video
Tech Video
Tech Byte: Hydraulic Belt Tensioners Explained- Why Going Slow Prevents Costly Accessory Drive Damage
Learn how to properly handle a Cloyes hydraulic belt tensioner and avoid costly failures. Handle a hydraulic tensioner wrong, you're risking the whole system.
tech-byte-hydraulic-belt-tensioners-explained
February 5, 2026
Tech Center
Find the heavy-duty accessory drive kit your business needs.
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 kits.
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.
