Metelli PA105 Engine Water Pump

Metelli PA105 Engine Water Pump

The Metelli PA105 engine water pump is a new replacement water pump built with a cast iron housing and cast iron impeller for Mercedes-Benz diesel applications. It includes a gasket and uses a reinforced ball/ball bearing design to support smooth coolant circulation in the engine cooling system.

Key Features

• New engine water pump for cooling system service
• Cast iron housing for durable construction
• Cast iron impeller with 8 vanes
• Reinforced ball/ball bearing type
• Gasket included for installation
• Impeller outside diameter: 69 mm
• Bearing outside diameter: 42 mm

Detailed Description

Metelli PA105 is an OE-style engine water pump for select Mercedes-Benz 300D, 300SD, 300TD, and 300SEL models. It is built as a new unit with a cast iron body and cast iron impeller, and the 8-vane impeller design is intended to maintain consistent coolant flow through the engine. This part cross-references Airtex AW9172 and Beck/Arnley 131-1422 for the same application. The PA105 is a practical choice when replacing a worn Mercedes-Benz water pump on classic diesel cooling systems.

Vehicle Fitment

• Fits 1975-1985 Mercedes-Benz 300D, N/A, w/3 1/2 Hub Height & 5/8 Thick Hub
• Fits 1978-1985 Mercedes-Benz 300SD, N/A, w/3 1/2 Hub Height & 5/8 Thick Hub
• Fits 1979-1985 Mercedes-Benz 300TD, N/A, w/3 1/2 Hub Height & 5/8 Thick Hub
• Fits 1968-1969 Mercedes-Benz 300SEL, N/A, w/3 1/2 Hub Height & 5/8 Thick Hub

What It Helps Address

• Coolant circulation problems caused by a worn water pump
• Engine overheating related to reduced pump output
• Coolant leakage at the pump mounting surface when the old gasket fails
• Bearing noise or rough operation from a failing pump assembly
• Impeller wear that can reduce coolant movement in the engine

Installation Notes and Tips

Verify hub height and hub thickness before installation, especially on Mercedes-Benz 300D, 300SD, 300TD, and 300SEL applications. Clean the mounting surface thoroughly, replace the gasket during service, and inspect the belt drive, thermostat, hoses, and coolant condition at the same time. Confirm the part number PA105 against the vehicle’s cooling system configuration before final assembly.

Quality Assurance

Metelli supplies new replacement cooling components built to match the listed application details, including cast iron construction and reinforced bearing support. The PA105 is cataloged with confirmed fitment for select Mercedes-Benz diesel models and is supported by multiple cross-reference numbers for application matching.