Dorman 420-104 Engine Timing Belt Tensioner

Engine Timing Belt Tensioner for Hyundai and Kia

Dorman 420-104 is an engine timing belt tensioner built to match the fit and function of the original tensioner on specified applications. It uses ductile iron construction with a cast steel contact surface and an automatic hydraulic tensioner style for dependable timing belt control in service.

Compatible with 1999-2005 Hyundai Sonata, 2001-2004 Hyundai Santa Fe, and 2006 Kia Optima applications, this OE-style replacement is built for direct-fit service on the listed vehicles. The Dorman 420-104 part number is also commonly searched as a replacement for timing belt tensioner service on these Hyundai and Kia models.

• Direct replacement for the original engine timing belt tensioner on specified applications
• Ductile iron body for strength and durability
• Cast steel contact surface for consistent belt contact
• Automatic hydraulic tensioner style
• Standard replacement grade for routine timing belt service
• Bracket not included; pulley not included
• Adjustable: No

Detailed Product Overview

This Dorman 420-104 timing belt tensioner is engineered for the engine valve train system where stable belt tension is critical to timing accuracy. It is designed for the listed Hyundai Sonata, Hyundai Santa Fe, and Kia Optima applications, making it a practical replacement when servicing the timing belt system on those vehicles. The part number 420-104 is frequently referenced in timing belt repair searches for Hyundai and Kia engine maintenance.

This part cross-references Dayco 85040 for the same application.

Common Timing Belt Service Issues

• Timing belt slack caused by a worn hydraulic tensioner
• Noise from a failing tensioner contact surface
• Inconsistent belt tension during engine operation
• Timing belt service intervals that require tensioner replacement
• Driveability concerns tied to worn valve train components

Installation Notes and Tips

Install during timing belt service and verify the belt routing, alignment, and tensioner operation before engine start-up. Confirm vehicle application by year and model before ordering, since this part is listed for 1999-2005 Hyundai Sonata, 2001-2004 Hyundai Santa Fe, and 2006 Kia Optima. Follow the vehicle service procedure for timing marks and component inspection.

Quality Assurance

Dorman manufactures this replacement tensioner to match the fit and function of the original part on the specified applications. It is built from quality materials for reliable performance and durability in timing belt service.