GMB 421-8750 Engine Timing Idler

Engine Timing Idler for GM and Suzuki Applications

GMB 421-8750 is an engine timing idler built to meet or exceed OEM specifications. It is a metal pulley assembly with a serpentine and V-belt pulley type, made for dependable belt routing in select Chevrolet, Pontiac, and Suzuki applications.

For drivers searching for a Chevrolet Aveo timing idler, Pontiac Wave engine timing idler, or Suzuki Swift+ replacement pulley, this part number 421-8750 provides a direct-fit service option for the listed vehicles.

Key Features

• Engine timing idler for valve train and belt drive service
• Manufactured to meet or exceed OEM specifications
• Metal pulley construction for durability
• Serpentine and V-belt pulley type
• 1-groove pulley design
• Cross-reference: Gates T42170

Detailed Product Overview

GMB 421-8750 is engineered as an engine timing idler for select compact GM and Suzuki platforms. The metal pulley construction and single-groove design support stable belt tracking in applications that use serpentine and V-belt routing. This part is listed for 2004-2016 Chevrolet Aveo, 2006-2011 Chevrolet Aveo5, 2007-2010 Pontiac G3, 2009 Pontiac G3 Wave, 2004-2009 Suzuki Swift+, 2005-2008 Pontiac Wave, and 2005-2007 Pontiac Wave5. It is also a practical match for shoppers comparing 421-8750 against OE-style replacement needs.

This part cross-references Gates T42170 for the same application.

Common Problems This Part Can Address

• Worn or noisy timing idler pulley
• Belt misalignment from pulley wear
• Rough pulley rotation during timing service
• Replacement needs during engine belt maintenance
• Fitment matching for Chevrolet Aveo, Pontiac Wave, and Suzuki Swift+ service work

Installation Notes and Tips

Verify the vehicle year, make, and model before ordering. Confirm belt routing and pulley style against the original component, especially on Chevrolet Aveo and Pontiac Wave applications. Inspect the surrounding belt system during installation and replace any worn belts or related components as needed to maintain proper operation.

Quality Assurance

GMB manufactures this timing idler to meet or exceed OEM specifications, supporting OE-level fit and function for the listed applications. Part number 421-8750 is built as a metal pulley assembly for consistent service performance.