Gates 43239HD Engine Water Pump

Heavy-Duty Cooling Replacement

This Gates heavy-duty engine water pump is built for commercial cooling systems that need dependable circulation and consistent sealing. It is a direct replacement water pump for select Mack CV, CHN, CT, CXN, LE, DM, MR, and CX applications with the specified 5.3-inch water pump pulley.

Gates 43239HD combines cast iron housing and impeller construction with an accessory-belt drive and included pulley. The reverse-rotation design and OE-quality fit make it a practical choice for Mack cooling system service where the original pump specification calls for this configuration. Part number 43239HD is also referenced by 316GC3193 and 943239HD for the same application.

Key Features

• Cast iron housing for durable cooling-system service
• Cast iron impeller for consistent coolant movement
• Reverse-rotation design for matched belt-drive operation
• Accessory-belt driven with pulley included
• Includes water pump and O-ring
• Not timing-belt driven

Fitment Details

• Fits 2004-2008 Mack CV, N/A, W/5.3" Dia. W.P. Pulley; Water Pump (Heavy-Duty)
• Fits 2004-2007 Mack CHN, N/A, W/5.3" Dia. W.P. Pulley; Water Pump (Heavy-Duty)
• Fits 2007 Mack CT, N/A, W/5.3" Dia. W.P. Pulley; Water Pump (Heavy-Duty)
• Fits 2005 Mack CT, N/A, W/5.3" Dia. W.P. Pulley; Water Pump (Heavy-Duty)
• Fits 2005-2007 Mack CXN, N/A, W/5.3" Dia. W.P. Pulley; Water Pump (Heavy-Duty)
• Fits 2004-2007 Mack LE, N/A, W/5.3" Dia. W.P. Pulley; Water Pump (Heavy-Duty)
• Fits 2004-2006 Mack DM, N/A, W/5.3" Dia. W.P. Pulley; Water Pump (Heavy-Duty)
• Fits 2004-2006 Mack MR, N/A, W/5.3" Dia. W.P. Pulley; Water Pump (Heavy-Duty)
• Fits 2003-2005 Mack CX, N/A, W/5.3" Dia. W.P. Pulley; Water Pump (Heavy-Duty)

Common Uses

• Restores coolant circulation when the original pump is worn or leaking
• Addresses overheating caused by reduced pump output
• Replaces a noisy or bearing-worn water pump assembly
• Helps correct seal failure at the pump housing
• Supports service on heavy-duty Mack cooling systems

Installation Notes

Verify pulley diameter and reverse-rotation specification before installation. Confirm accessory-belt drive configuration and match the pump to the listed Mack application and notes. Replace the O-ring during service and inspect the belt drive, pulley alignment, and surrounding cooling components before returning the vehicle to service.

Quality Assurance

Gates states that each heavy-duty water pump is 100 percent function-tested for seals and bearings and 100 percent leak-tested at the casting and assembled pump level. The brand also positions this part as an OE-quality fit for heavy-duty cooling service.