Sea Water Pump for Yanmar 2GM20 3GM30 Motors 128377-42500 128397-42500

Sea Water Pump for Yanmar

This sea water pump is a direct replacement for Yanmar 2GM20 and 3GM30 motors, circulating raw water through the engine cooling system and matching Yanmar part numbers 128377-42500 and 128397-42500.

Overview

This sea water pump delivers reliable raw-water flow for Yanmar 2GM20 and 3GM30 marine diesel engines. Designed as a direct replacement for the factory sea water pump, it uses the standard mounting configuration and fits the original cooling circuit. Boat owners and marine mechanics can install this sea water pump to maintain proper engine temperature.

Built For Performance

• Direct replacement for Yanmar 2GM20 and 3GM30 motors
• Matches Yanmar part numbers 128377-42500 and 128397-42500
• Uses the same raw-water pump mounting configuration as the factory pump
• Built for continuous marine cooling service
• Works with the standard inlet and outlet connections on the listed engines

Fits These Machines

• for Yanmar 2GM20
• for Yanmar 3GM30

On-The-Job Use

• Raw-water cooling on Yanmar 2GM20 and 3GM30 marine engines
• Replacing a worn sea water pump during scheduled engine maintenance
• Supporting continuous operation in saltwater and freshwater environments

Specs At A Glance

Good To Know

Q: What is the difference between a sea water pump and a raw water pump? A: There is no functional difference; this sea water pump moves raw water through the engine cooling system in the same way a factory raw water pump does.

Q: Will this sea water pump fit a Yanmar 2GM20? A: Yes, this replacement sea water pump is designed to fit Yanmar 2GM20 and 3GM30 motors using the same mounting and connection points.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.