Gates T42084 Engine Timing Belt Idler Pulley

Gates T42084 Timing Belt Idler Pulley

The Gates T42084 is an engine timing belt idler pulley built for smooth backside belt contact and stable routing in timing systems. It is a plastic, flanged pulley with an 8 mm inside diameter, 30 mm width, and 52.5 mm outside diameter for applications that call for this exact configuration.

Key Features

• Plastic idler pulley with a smooth/backside contact surface
• Flanged end helps maintain belt tracking in the timing drive
• 8 mm inside diameter, 30 mm width, 52.5 mm outside diameter
• Direct timing belt pulley replacement for selected Gates PowerGrip applications
• Cross-references GMB 421-9540 for the same application

Product Details

Gates PowerGrip idler pulleys are offered as fixed idlers or as replacements for a tensioner bracket, depending on the application. The T42084 follows that design approach with a smooth backside running surface, making it suitable for timing belt systems that ride on the back of the belt rather than a grooved sprocket profile. This part number is used across multiple import and domestic applications, including Chevrolet Captiva Sport, Chevrolet Astra, Suzuki Forenza, Isuzu Rodeo, Isuzu Rodeo Sport, Isuzu Amigo, and Chevrolet LUV.

Use Gates T42084 when servicing timing belt systems on 2008-2011 Chevrolet Captiva Sport, 2004-2006 Chevrolet Astra, 2004-2008 Suzuki Forenza, 1998-2003 Isuzu Rodeo, 2001-2003 Isuzu Rodeo Sport, 1998-2000 Isuzu Amigo, and 1998 Chevrolet LUV. This part number also appears in interchange listings for 024-1284, 1281085Z00, 9128738, 09128738, 8091287380, TBT25212, and VKM25212.

Common Repair Uses

• Replacing a worn or noisy timing belt idler pulley
• Restoring proper belt routing in the timing drive
• Addressing belt tracking issues caused by pulley wear
• Servicing interference-engine timing components on listed Isuzu and Suzuki applications
• Correcting timing system noise from a damaged pulley bearing surface

Installation Notes

Verify pulley dimensions, belt path, and engine application before installation. Confirm the timing belt system is aligned correctly and inspect related components such as the belt, tensioner, and adjacent pulleys during service. For interference-engine applications, follow the manufacturer timing procedure carefully to maintain valve timing accuracy.

Quality Assurance

Gates PowerGrip components are engineered for timing system service and built to match the specified pulley style, surface type, and dimensions required by the application. The T42084 is a direct-fit timing belt idler pulley for the listed vehicles and engine configurations.