For M71 M70 Cummins 4B Engines Raw Water Pump Impeller Pump Sea 3907458 3912019

Raw Water Pump Impeller Pump for Cummins 4B Engines

This raw water pump impeller pump assembly services the seawater cooling circuit on Cummins 4B marine engines and cross-references OEM part numbers 3907458 and 3912019.

Overview

This raw water pump impeller pump for Cummins 4B marine engines moves cooling water from the sea strainer through the engine heat exchanger to keep operating temperatures in check. The assembly matches OEM references 3907458 and 3912019, making it a practical replacement for a worn or leaking pump on M70 and M71 applications. It suits owners and mechanics servicing Cummins 4B marine power plants who want a direct-fit cooling component.

Built For Performance

• Complete impeller pump assembly ready to bolt on in place of the original unit
• Cross-references OEM part numbers 3907458 and 3912019 for confident matching
• Housing and impeller built to handle continuous seawater flow in marine cooling systems
• Sealed shaft design keeps water out of the bearing and drive area
• Designed around the Cummins 4B marine engine mounting pattern

Fits These Machines

• for Cummins 4B marine engines
• for M70 applications
• for M71 applications

On-The-Job Use

• Routine replacement of a worn raw water pump on marine engines
• Cooling system service during impeller and seal maintenance
• Repower and refit projects on Cummins 4B powered boats
• Spare parts stocking for marine service shops

Specs At A Glance

Good To Know

Q: Should the impeller be inspected after installation? A: Yes, check the impeller at the start of each season and replace it if vanes are cracked, set, or missing. Running the pump dry even briefly can damage a new impeller.

Q: Does this pump include a gasket or mounting hardware? A: The listing covers the pump assembly as shown in the title, so confirm gasket and hardware needs against your engine before ordering. Reusing old gaskets is not recommended.

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