Raw Water Pump Replaces 3907458 3912019 For M70 M71 Cummins 4B Diesel

Raw Water Pump for Cummins 4B Diesel

This raw water pump replaces OEM references 3907458 and 3912019 and circulates cooling water through M70 and M71 marine diesel setups.

Overview

This raw water pump is a direct replacement for the 3907458 and 3912019 units used on Cummins 4B diesel marine engines. It moves raw water through the cooling circuit, keeping engine temperatures stable during long runs. Built for boat owners and diesel mechanics needing a dependable raw water pump for M70 and M71 applications.

Built For Performance

• Replaces OEM part numbers 3907458 and 3912019
• Designed for M70 and M71 Cummins 4B diesel marine use
• Pump body supports steady raw water flow for engine cooling
• Sealed bearing design limits water intrusion at the shaft
• Direct mount to factory bolt pattern for a drop-in replacement

Fits These Machines

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

On-The-Job Use

• Marine engine cooling circuits on inboard diesel boats
• Impeller-to-heat-exchanger raw water supply
• Routine raw water pump replacement during service intervals
• Refit projects on M70 and M71 diesel builds

Specs At A Glance

Good To Know

Q: Is this an original Cummins part? A: No, this is an aftermarket replacement pump built to replace OEM part numbers 3907458 and 3912019. It is not manufactured or sold by Cummins.

Q: Can I reuse the old impeller? A: A raw water pump is usually installed with a fresh impeller and gasket. Reusing a worn impeller on this pump type risks overheating and early failure.

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