Marine Water Pump for Cummins N855, N855M, NT855, NTA855, NH220, NH250 & VT555 Engines

Reliable Cooling for Heavy-Duty Cummins Marine Power

Marine diesel engines operate under some of the harshest conditions possible — long hours at steady load, saltwater exposure, and high under-deck temperatures. To stay cool and reliable, they depend on a raw water pump (also called a sea water pump) to draw in seawater and push it through the heat exchanger system. For large Cummins engines such as the N855, N855M, NT855, NTA855, NH220, NH250, and VT555, the water pump is a mission-critical component that keeps your vessel running safely.

When the pump begins to fail — whether through worn bearings, leaking seals, or corroded housings — the result can be overheating, engine shutdowns, and costly repairs. That’s why having a high-quality, ready-to-install replacement on hand is essential for both professional operators and recreational boaters running these legendary Cummins models.

A Complete, Ready-to-Install Marine Water Pump

Our marine water pump for Cummins N and VT-series engines is designed for a direct bolt-on replacement. It comes fully assembled with the correct marine-grade materials to withstand seawater exposure and continuous operation at heavy loads.

Key features include:

• Durable marine-grade housing to resist corrosion and saltwater damage.

• Precision bearings and seals to handle continuous duty cycles without premature wear.

• OEM-quality impeller and shaft alignment for reliable water flow and long service life.

• Direct fit for N855, N855M, NT855, NTA855, NH220, NH250, and VT555 engines — no modifications required.

• Balanced design for smooth operation and reduced strain on belts and drive systems.

Every pump is inspected to meet or exceed factory performance standards, so you can replace your existing unit with confidence.

Watch the Pump from Every Angle — Turntable Product Video

To help you see exactly what you’re getting, we’ve included a 360-degree product video showing the pump on a turntable. You can view the full housing, inlet and outlet orientation, mounting flange, and pulley design — all details that matter when planning a marine engine repair.

This visual walkthrough helps you confirm fitment before ordering and lets you see the high-quality machining and finish of the pump.

When to Replace Your Cummins Marine Water Pump

Consider replacing your pump if you notice:

• Leaking seawater around the shaft or weep hole.

• Excessive vibration or noise from worn bearings.

• Overheating or reduced water flow at the discharge.

• Corrosion or pitting on the pump housing or impeller.

• Routine maintenance intervals — many operators replace pumps as preventative care during major overhauls.

Installing a new pump before complete failure can prevent expensive engine overheating and keep your boat operational when you need it most.

Diesel Pro Power — In Stock and Ready to Ship

Diesel Pro Power keeps Cummins marine water pumps for these models in stock and ready for fast worldwide shipping. Whether you’re maintaining a workboat, tug, commercial fishing vessel, or pleasure craft, you can rely on:

• Immediate availability — avoid long factory lead times.

• Trusted quality — each pump is built to rigorous specifications.

• Expert support — our team can help you confirm fitment.

• Worldwide delivery — so you get back on the water without delay.

With over 40,000 satisfied customers, Diesel Pro Power has built a reputation for keeping Cummins marine engines running strong.

Order Your Replacement Marine Water Pump Today

Don’t let a failing water pump put your vessel at risk of overheating. Order your Cummins marine water pump today and keep your N855, N855M, NT855, NTA855, NH220, NH250, or VT555 running cool and reliable on the water.

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