Engine Water Pump for Cummins NH855, NT855 Engines

Technical Overview
This NEW engine water pump for Cummins NH855 and NT855 engines is engineered for Big Cam I and Big Cam II configurations. It features a 4 1/2″ vented impeller (4.5″ equivalent) and a 4 11/16″ multi-groove pulley, delivering strong and consistent coolant flow under heavy-duty operation. Each unit ships NEW and includes a full 1-year warranty.

Detailed Features
• NEW replacement water pump, not remanufactured
• Compatible with Cummins NH855 and NT855 Big Cam I & II engines
• 4 1/2″ vented impeller for efficient coolant flow
• 4 11/16″ multi-groove pulley (approx. 4.6875″)
• Backed by a 1-year Diesel Pro warranty
• Clear distinction from Big Cam IV and Small Cam pump versions

FAQ

1. What is the function of this engine water pump?
This NEW water pump circulates coolant through the block and cylinder head to maintain optimal temperature in Cummins NH855 and NT855 Big Cam I & II engines.

2. Which engines does it fit?
It fits Cummins NH855/NT855 Big Cam I & II engines equipped with a 4 1/2″ vented impeller and a 4 11/16″ multi-groove pulley.

3. What material is used?
This pump uses a cast-metal housing with precision-machined internal components designed for heavy-duty NH/NT cooling systems.

4. How does this model differ from other NH/NT pumps?
This model is NEW and specific to Big Cam I & II: 4 1/2″ vented impeller and multi-groove pulley. Other NH/NT versions may use 4 1/4″ or 5 1/4″ impellers, non-vented designs, single-groove pulleys, or Big Cam IV/Small Cam configurations.

5. Does it include a warranty?
Yes. This NEW water pump includes a full 1-year warranty from Diesel Pro.

Available at Diesel Pro with our trusted 1-year warranty and same-day shipping for most orders.