Metelli PA578 Engine Water Pump

Reliable Engine Water Pump for Mercedes-Benz Models

The Metelli PA578 engine water pump is designed to provide efficient cooling system performance for select Mercedes-Benz vehicles. Engineered with durable materials and precision components, this water pump ensures consistent coolant circulation to maintain optimal engine temperature.

• Includes gasket for secure and leak-free installation
• Aluminium housing for lightweight strength and corrosion resistance
• Cast iron impeller with 8 vanes for effective coolant flow
• Ball/ball bearing type with 36mm outside diameter for smooth operation
• New, not remanufactured, ensuring reliable performance

Technical Details and Construction

The Metelli PA578 water pump features an aluminium housing that offers a balance of durability and weight savings, helping to reduce overall engine load. The cast iron impeller, with an outside diameter of 82mm and 8 vanes, is designed to optimize coolant flow through the engine’s cooling system. The ball/ball bearing with a 36mm outside diameter supports smooth rotation and long service life. This water pump comes complete with a gasket to ensure a proper seal during installation, minimizing the risk of leaks.

Compatible Mercedes-Benz Models

This engine water pump is compatible with a range of Mercedes-Benz vehicles, including the 400E, 400SE, 400SEL, 500E, 500SEC, 500SEL, 500SL, E420, E500, S420, S500, and SL500. The PA578 part number is specifically designed to meet the cooling system requirements of these models, making it a suitable replacement part for maintenance or repair.

Common Applications and Issues Addressed

• Replacement of worn or leaking water pumps
• Resolution of engine overheating due to coolant circulation failure
• Elimination of coolant leaks caused by damaged seals or gaskets
• Restoration of proper coolant flow to prevent engine damage
• Maintenance of engine temperature stability for optimal performance

Installation Notes and Tips

When installing the Metelli PA578 water pump, ensure the gasket is properly seated to prevent leaks. It is recommended to inspect the cooling system hoses and thermostat during installation to maintain overall system integrity. Use manufacturer-recommended torque specifications for mounting bolts to avoid damage to the aluminium housing. Proper coolant refill and system bleeding are essential to remove air pockets and ensure efficient operation.

Quality Assurance and Warranty

Metelli manufactures the PA578 water pump to meet strict quality standards, using high-grade materials such as aluminium and cast iron for durability. The new water pump is tested for performance and reliability before shipment. While specific warranty details may vary, Metelli products typically come with a limited warranty covering manufacturing defects to provide confidence in your purchase.