Cummins QSB Marine Engine Water Pump Impeller 3974456 SMX Super 27 Sherwood

Water Pump Impeller for Cummins

This water pump impeller for Cummins QSB marine engines replaces OEM part number 3974456 and cross-references SMX Super 27, ensuring reliable coolant flow in the raw water pump.

Overview

This water pump impeller is a direct replacement for the original equipment part in Cummins QSB marine engines. It ensures efficient water circulation to prevent overheating and is built for demanding marine environments. The impeller is designed to match the exact specifications of the OEM 3974456 part.

Built For Performance

• Precision-molded rubber vanes for positive displacement
• Corrosion-resistant construction for saltwater exposure
• Exact dimensions match OEM specifications
• Reinforced hub for secure mounting
• Resistant to heat and wear for long service life

Fits These Machines

• for Cummins QSB marine engines

On-The-Job Use

• Circulates raw water through the engine cooling system
• Used in marine diesel raw water pumps
• Replacement for worn or damaged impellers in Cummins QSB engines
• Works in both fresh and salt water environments

Specs At A Glance

Good To Know

Q: Is this impeller compatible with the original Cummins pump? A: Yes, it is designed to replace OEM 3974456 and matches original specifications for a secure fit.

Q: What is the recommended replacement interval? A: Typically inspect annually and replace if cracked or worn, especially in marine environments where saltwater can accelerate degradation.

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