GMB 450-8340 Engine Timing Belt Tensioner

Engine Timing Belt Tensioner for Nissan and Infiniti

GMB 450-8340 is an engine timing belt tensioner built to meet or exceed OEM specifications. It is a direct-fit replacement for a wide range of Nissan, INFINITI, and Mercury applications, including Frontier, Xterra, Pathfinder, Quest, and QX4 models.

For timing belt service on older Nissan and INFINITI engines, this tensioner helps maintain proper belt control and consistent drive alignment. The GMB 450-8340 part number is also referenced in OE-style replacement searches for 1984-2004 Nissan and INFINITI applications.

Key Features

• Engine timing belt tensioner for valve train service
• Built to meet or exceed OEM specifications
• Metal pulley construction for durability
• Serpentine and V-belt pulley type
• 1 mm pulley diameter specification listed by manufacturer data
• Cross-reference part numbers include ACI 84016 and Gates T41059

Detailed Description

This GMB timing belt tensioner is engineered for vehicles that require stable belt tension and accurate belt tracking during engine operation. It serves as an OE-style replacement for applications such as Nissan Frontier, Nissan Xterra, Nissan Quest, Nissan Pathfinder, and INFINITI QX4, along with additional Nissan and Mercury coverage. If you are searching for a timing belt tensioner for a 1999-2004 Nissan Frontier, 2000-2004 Nissan Xterra, or 1987-1995 Nissan Pathfinder, this part number 450-8340 belongs in your fitment review.

This part cross-references ACI 84016 and Gates T41059 for the same application.

Common Issues This Part May Address

• Timing belt slack or inconsistent belt tension
• Belt noise caused by worn tensioner components
• Improper belt tracking during engine operation
• Service replacement for a worn OE tensioner assembly
• Timing belt maintenance on high-mileage Nissan and INFINITI engines

Installation Notes and Tips

Verify engine code, belt routing, and fitment before installation. Replace the tensioner during timing belt service when wear, noise, or movement is present, and inspect related pulleys and belt condition at the same time. Confirm the correct application for your vehicle by matching the part number 450-8340 to the engine family and model year.

• Fits 1999-2004 Nissan Frontier, N/A
• Fits 2000-2004 Nissan Xterra, N/A
• Fits 1993-2002 Mercury Villager, N/A
• Fits 1993-2002 Nissan Quest, N/A
• Fits 1997-2000 INFINITI QX4, N/A
• Fits 1987-1995 Nissan Pathfinder, N/A
• Fits 1995 Nissan Pickup, N/A
• Fits 1986-1994 Nissan D21, N/A
• Fits 1985-1994 Nissan Maxima, N/A
• Fits 1990-1992 INFINITI M30, N/A
• Fits 1984-1989 Nissan 300ZX, N/A
• Fits 1987-1988 Nissan 200SX, N/A

Quality Assurance

GMB manufactures this timing belt tensioner to meet or exceed OEM specifications, supporting consistent fit and function across the listed Nissan, INFINITI, and Mercury applications.