GMB 450-8920 Engine Timing Idler - Upper

Engine Timing Idler for Nissan and Infiniti

GMB 450-8920 is an engine timing idler built to meet or exceed OEM specifications. It is a metal pulley assembly with a single groove and a serpentine and V-belt pulley profile for direct-fit service on select Nissan and Infiniti applications.

Key Features

• Engine timing idler for upper-position applications
• Metal pulley construction for durable service
• Single-groove pulley design
• Works with serpentine and V-belt routing
• Built to meet or exceed OEM specifications
• Cross-references Gates T42020 and Dorman - Conduct-Tite 85244 for the same application

Application Details

Compatible with 1993-1997 INFINITI J30, upper, and 1990-1996 Nissan 300ZX, upper. This GMB 450-8920 timing idler supports the upper timing drive layout used in these vehicles and is a direct replacement option for service work on the Nissan 300ZX and Infiniti J30 timing system.

What It Helps Address

• Timing belt noise from a worn idler pulley
• Belt tracking issues caused by pulley wear
• Rough pulley rotation from age or contamination
• Service replacement for a damaged upper timing idler
• Maintenance on Nissan 300ZX and Infiniti J30 timing drive components

Installation Notes and Tips

Verify upper-position fitment before installation and compare the original pulley diameter, groove style, and belt routing to the existing part. Inspect the surrounding timing components during service, and confirm the replacement matches the vehicle’s timing belt layout before reassembly.

Quality Assurance

GMB manufactures this timing idler to meet or exceed OEM specifications, supporting consistent fit and function for select Nissan and Infiniti applications. Part number 450-8920 is also referenced in aftermarket catalogs for the same application.