GMB 430-8940 Engine Timing Belt Tensioner

Engine Timing Belt Tensioner for Metro and Firefly

GMB 430-8940 is an engine timing belt tensioner built for direct-fit service on select Chevrolet Metro, Pontiac Firefly, and Geo Metro applications. It is manufactured to meet or exceed OEM specifications and uses a metal pulley with a single groove for dependable belt control.

Key Features

• Engine timing belt tensioner for valve train service
• Metal pulley construction for durability
• Single-groove pulley design
• Works with serpentine and V-belt pulley/belt types as listed
• Built to meet or exceed OEM specifications
• Part number 430-8940 for easy identification

Detailed Description

This GMB timing belt tensioner is engineered for 1998-2000 Chevrolet Metro, 1996-2000 Pontiac Firefly, and 1996-1997 Geo Metro applications. The 430-8940 tensioner supports proper belt tension in the engine timing system, helping maintain stable belt tracking and consistent operation. Its metal pulley construction and single-groove layout make it a practical OE-style replacement for service work on these compact GM-platform vehicles. This part cross-references ACI 84042 for the same application.

What It Helps Address

• Excessive timing belt slack
• Belt noise from worn tension components
• Uneven belt tracking at the pulley
• Service replacement for a worn or noisy tensioner assembly
• Timing system maintenance on Metro and Firefly engines

Installation Notes and Tips

Verify belt routing and tensioner alignment before installation. Inspect the timing belt, idler components, and related seals during service, since worn parts can shorten the life of the new tensioner. Confirm vehicle fitment by year and model before ordering, especially for 1998-2000 Chevrolet Metro, 1996-2000 Pontiac Firefly, and 1996-1997 Geo Metro applications.

Quality Assurance

GMB states this part is manufactured to meet or exceed OEM specifications, supporting OE-level fit and function for the listed applications. Part number 430-8940 is identified for accurate replacement matching.