This water pump is a new aftermarket replacement for Cummins ISX, ISX15, and QSX15 15.0L diesel engine applications. It is designed to replace a worn, leaking, or failed coolant pump and help restore proper coolant circulation and engine temperature control. Common replacement part numbers include 3684450, 3683651, 4386576, and 5719763. Some applications may also reference related seal or O-ring numbers, so please compare your original pump, part number, and engine serial number before ordering. This listing includes the water pump assembly as shown. Please confirm whether your engine requires a separate housing, gasket, seal, or O-ring before installation.
Engine Compatibility: Replacement water pump for Cummins ISX, ISX15, and QSX15 15.0L diesel engine applications. Commonly used on heavy-duty truck and equipment engines.
Replacement Part Numbers: Replaces 3684450, 3683651, 4386576, 5719763, and related water pump references. Please compare your original part number before ordering.
Application Notes: Commonly used with Cummins ISX series engines, including CM870, CM871, and CM2250 applications. Fitment may vary by engine serial number and pump style.
Heavy-Duty Cooling Performance: Built to support proper coolant flow and stable engine temperature in demanding diesel truck and equipment applications. Helps replace leaking, worn, noisy, or failed water pumps.
Aftermarket Replacement: New aftermarket replacement part designed to help restore proper coolant circulation and prevent overheating.