Gates 43556 Engine Water Pump - Main

Gates Water Pump for Mercedes-Benz V8 Cooling Service

The Gates 43556 engine water pump is a standard replacement for select Mercedes-Benz models with accessory-belt drive. Built with a cast aluminum housing and stamped steel impeller, it is engineered for dependable coolant circulation in applications such as the Mercedes-Benz G550, GL450, GL550, SL550, CLS550, E550, ML550, S450, S550, CL550, and CLK550.

Gates Water Pump (Standard) parts are built for OE-quality fit and consistent operation, with seal and bearing testing plus leakage testing performed on the pump assembly and casting.

• Cast aluminum housing for strength and corrosion resistance
• Stamped steel impeller with standard rotation
• Accessory belt driven design
• Includes water pump and metal gasket
• Two outlet connections
• No back housing, thermostat housing, fan clutch, or pulley included
• Not timing belt driven

Product Details and Fitment

This Gates 43556 water pump is a direct-fit cooling system component for Mercedes-Benz V8 applications that use an accessory belt drive. It is a standard-rotation pump with a cast aluminum body and stamped steel impeller, selected to match the original cooling system layout on the listed vehicles. This part cross-references GMB 147-1050 and Beck/Arnley 131-2384 for the same application.

Compatible with Mercedes-Benz G550, GL450, GL550, SL550, CLS550, E550, ML550, S450, S550, CL550, and CLK550 applications across the listed model years. Part number 43556 is also referenced by several aftermarket and OE-style numbers, including 943556 and A2732000201.

Common Cooling System Issues

• Coolant leakage from a worn pump seal or casting surface
• Overheating caused by reduced coolant circulation
• Noise from worn pump bearings
• Visible coolant residue around the pump area
• Temperature fluctuation during idle or stop-and-go driving

Installation Notes

Verify engine code, belt routing, outlet configuration, and mounting style before installation. Replace the metal gasket during service and inspect the accessory belt, pulleys, hoses, and thermostat condition while the cooling system is open. Proper coolant fill and system bleeding are important after installation to help prevent air pockets.

Quality Assurance

Gates manufactures this water pump with premium alloy materials and tests seals, bearings, and leakage before release. The result is a replacement water pump built to meet OE-quality fit expectations for Mercedes-Benz cooling system service.