Cummins KTA 38 Marine Water Pump - Aftermarket

Cummins KTA38 Marine Water Pumps & Cooling System Components

The Cummins KTA38 engine is one of the most powerful and widely used high-horsepower marine engines in the world. From commercial vessels to offshore support ships, this engine delivers exceptional durability and consistent performance. A critical element in maintaining that performance is the marine raw water pump system. At Diesel Pro Power, we provide an extensive catalog of raw water pumps and supporting cooling components tailored specifically for the Cummins KTA38 and KTA50 marine engines.

With 40,000+ satisfied customers worldwide, Diesel Pro Power is the trusted source for Cummins marine water pump parts, silicone hoses, clamps, zinc anodes, impeller pullers, and thermostat components—everything you need to maintain your KTA38’s cooling system with confidence.

Raw Water Pump for Cummins KTA38 Marine Engines

Marine Water Pump (Flanged Bronze Body)

The primary raw water pump for the Cummins KTA38 is a high-capacity, flanged unit with a durable bronze body, designed for extended service life in harsh saltwater conditions. This pump ensures a continuous flow of seawater through the engine’s heat exchanger, enabling optimal temperature regulation during prolonged operation.

Key features:

Flanged 2" port design for secure fit
Bronze construction for corrosion resistance
Designed to handle high-volume flow for KTA38 and KTA50 marine engines

This pump is compatible with both the standard K and KTA Series marine engine configurations. Whether you're powering a tug, cargo vessel, or offshore supply ship, this raw water pump is built for mission-critical marine environments.

Marine Water Pump with 2” Flange Port

For applications where space or plumbing requires alternative port design, we offer a variant marine water pump featuring a 2-inch flanged port. This model matches the high-performance specifications of the bronze-body pump but is optimized for custom intake routing on select vessel layouts.

Use this configuration if:

You require compatibility with non-standard intake plumbing
You are retrofitting older cooling system setups
You prefer a flanged interface for ease of maintenance and replacement

Thermostats & Thermostat Seals for Cummins KTA38

Cummins Thermostat – 180°F Non-Vented

Temperature regulation in a high-horsepower marine engine like the KTA38 is essential. The 180°F thermostat ensures the engine reaches and maintains optimal operating temperature quickly and remains stable during long voyages.

Features:

Non-vented design prevents premature coolant flow
Precision-calibrated to Cummins specifications
Maintains efficient thermal balance in high-output operations

Thermostat Seal

The thermostat seal is equally vital, forming a leak-proof seal between the thermostat and housing. A degraded seal can lead to coolant leaks, engine overheating, and long-term wear.

Benefits:

Designed for direct-fit on KTA38 thermostat housing
High-temp material withstands continuous marine duty
Helps maintain consistent coolant system pressure

Impeller Puller Tool for Cummins Marine Water Pumps

Impeller replacement is one of the most frequent maintenance tasks for raw water pumps. The impeller puller tool allows for safe, damage-free removal of worn impellers from the pump housing.

Why use an impeller puller?

Prevents impeller damage during removal
Avoids damage to the pump body and shaft
Speeds up maintenance tasks, reducing vessel downtime

This tool is compatible with KTA38 marine water pumps as well as other Detroit Diesel and Cummins marine applications.

Zinc Anodes for Cummins Marine Cooling Systems

Electrolysis and galvanic corrosion are ever-present threats in saltwater environments. Zinc anodes are sacrificial components that protect your engine's heat exchangers, fuel coolers, oil coolers, and water pumps.

Zinc for Heat Exchangers and Aftercoolers

Compatible with Cummins KTA38 marine heat exchangers and aftercoolers
Comes with brass NPT 1/2" plug, 2" zinc length
Protects bronze and brass components from saltwater corrosion

Zinc for Fuel and Oil Coolers

NPT 3/8” plug with 1” zinc length
Tailored for smaller coolant passages within fuel and oil coolers
Helps prevent premature failure of cooling system parts due to corrosion

Intake Water Strainers for Marine Raw Water Pumps

Raw water strainers are essential in protecting your KTA38 water pump from debris, seaweed, and sediment.

1" Pipe Size Strainer

9.5” height, 5.5” width
Suitable for smaller vessels or auxiliary systems

1.5" Pipe Size Strainer

11.5” height, 7.25” width
Ideal for medium-displacement cooling loops

2" and 2.5" Pipe Size Strainers

16” height, 7.5” width
Perfect match for the high-volume intake of KTA38 water pump systems

These intake strainers are built with corrosion-resistant marine-grade plastics and stainless steel mesh for extended life in saltwater environments.

Silicone Coolant Hoses for Cummins KTA38

Silicone coolant hoses are used in both raw water and freshwater loops, connecting heat exchangers, pumps, and thermostats.

Hose sizes available:
From 1" ID to 4" ID, including intermediary sizes like:

1-3/4"
2"
2-1/8"
2-1/4"
2-3/8"
2-1/2"
2-3/4"
3"
3-1/2"
4"

Benefits of silicone hoses:

High burst pressure
Excellent resistance to heat and saltwater exposure
Long service life with less frequent replacement
Perfect fit for all coolant routing on the KTA38 engine

Each hose is sold in 1-foot increments to allow for easy customization and routing.

Hose Clamps for Marine Water and Coolant Lines

High-torque, stainless steel hose clamps are critical for preventing leaks in marine cooling systems. Diesel Pro Power stocks a wide range of clamps with effective diameter ranges suitable for every hose size used in KTA38 engine applications.

Clamp Range Highlights:

Why invest in quality clamps?

Saltwater-safe construction
Superior sealing under vibration and temperature cycling
Prevents coolant or seawater leaks that could lead to engine overheating

Maintenance Tips for KTA38 Cooling System Longevity

To keep your Cummins KTA38 marine engine running at peak thermal efficiency, routine inspection and replacement of water pump components and accessories is essential.

Maintenance intervals:

Impellers: Replace every 12–24 months depending on use
Zinc anodes: Inspect every 3–6 months, replace when 50% depleted
Thermostats: Replace every 2–3 years or if overheating occurs
Coolant hoses: Inspect annually for cracks, swelling, or hardening
Water strainers: Clean monthly or after heavy debris exposure

Diesel Pro Power’s full selection of OEM-quality components helps ensure that every part of your KTA38’s cooling system is running smoothly and reliably.

Why Choose Diesel Pro Power for KTA38 Water Pump Parts?

Same-day shipping on all in-stock parts
Technical support from marine diesel experts
Exact-fit components backed by 40,000+ customers
24/7 online ordering through DieselPro.com

Whether you’re managing a commercial vessel or maintaining a personal marine fleet, Diesel Pro Power provides the raw water pump parts and accessories you need to keep your Cummins KTA38 operating at full power.