Complete Cooling System Upgrade Kit – This set includes the Water Pump Idler Pulley (Part No. WA768 / 3066330) and Water Pump Tensioner (Part No. 3064919). It is an ideal replacement solution for Cummins heavy-duty diesel engine cooling systems, providing a comprehensive and convenient maintenance upgrade.Broad Compatibility – The idler pulley (WA768 / 3066330) is designed for a wide range of Cummins engines, including N14, G50, G855, GTA855, K38, NH855, NT855, QSN14, and QSNT14. The tensioner (3064919) is primarily compatible with NT855 engines, making this kit suitable for various construction and commercial vehicles.Precision Engineered for Durability – The water pump idler pulley features a robust structure to effectively guide the belt and ensure efficient cooling system operation. The matching tensioner is constructed from high-strength steel/cast iron alloy with precision-machined cylindrical bearings to reduce friction and maintain consistent belt tension.Optimize Engine Performance – Proper belt tension management ensures stable and efficient operation of the water pump and radiator. With a load capacity up to 500 N and a wide operating temperature range (-20°C to 120°C), this kit withstands harsh engine environments, prevents overheating, and extends engine life.Easy Installation, Minimal Downtime – The tensioner is designed with an adjustable threaded shaft (M10 thread) for precise alignment and tension adjustment during installation. As a direct replacement part, it simplifies maintenance procedures, helping your equipment quickly return to optimal operating condition.