GMB 421-3243 Engine Timing Belt Tensioner

Engine Timing Belt Tensioner for OE Fitment

This GMB engine timing belt tensioner is built to meet or exceed OEM specifications for dependable timing system control. It is a direct-fit replacement for select Chevrolet Aveo, Aveo5, Pontiac G3, Pontiac Wave, Pontiac Wave5, and Suzuki Swift+ applications.

Key Features

• Engine timing belt tensioner for valve train service
• Manufactured to meet or exceed OEM specifications
• Metal pulley construction for durability
• Serpentine and V-belt pulley/belt type
• 1-groove pulley design
• GMB Part Number 421-3243

Product Details

GMB 421-3243 is an engine timing belt tensioner engineered for precise belt control in timing belt service. The metal pulley construction supports consistent operation, while the OE-spec manufacturing approach helps maintain proper belt tension in applications that require accurate timing system performance. This part cross-references Gates T43039 for the same application. It is a practical replacement choice for 2004-2008 Chevrolet Aveo, 2006-2008 Chevrolet Aveo5, 2007-2008 Pontiac G3, 2005-2008 Pontiac Wave, 2005-2007 Pontiac Wave5, and 2004-2008 Suzuki Swift+ models.

What It Helps Address

• Timing belt slack or inconsistent belt tension
• Noise from a worn or failing tensioner pulley
• Uneven belt tracking in the timing system
• Service replacement for worn OE tensioner components
• Restoring proper timing belt control during maintenance

Installation Notes and Tips

Verify engine code and timing belt service requirements before installation. Inspect the belt, idlers, and related timing components at the same time, since wear in one part can affect the rest of the system. Follow factory service procedures for alignment, torque, and timing marks to ensure correct operation after replacement.

Quality Assurance

GMB manufactures this tensioner to meet or exceed OEM specifications, supporting consistent fit and function for the listed applications. Part number 421-3243 is intended for direct replacement use in compatible timing belt service.