Cummins 6CTA Engine Parts - Marine Water Pump Section

Marine Water Pump & Cooling System Parts for Cummins 6CTA Engines

The Cummins 6CTA engine is a popular choice in marine applications due to its reliability, efficient power output, and long service life. To maintain optimal engine temperature and extend operational uptime, a properly functioning raw water cooling system is essential. Diesel Pro Power offers a wide selection of high-quality sea water pumps and related components tailored specifically for Cummins 6CTA marine engines.

Whether you're replacing a corroded impeller, installing a new hose kit, or upgrading the raw water pump itself, our inventory is built to meet the demanding conditions of marine environments. Below, you'll find an extensive catalog of seawater cooling system components for the Cummins C Series engines, including the 6CTA8.3 and 6CTA8.3-M2 variants.

Raw Water Pumps for Cummins C Series Marine Engines

Gear-Driven Marine Water Pumps

Our gear-driven sea water pumps are built for consistent performance in demanding marine conditions. These units are engineered for the Cummins C Series engines and feature reinforced casings, premium bronze impellers, and corrosion-resistant seals. Available models include:

• Standard Raw Water Pump with a 2” inlet hose barb and 1-¾” outlet hose barb configuration.

• Offset-Mount Pump, featuring a 16° offset mounting hole arrangement for precision alignment on Cummins C Series brackets.

• Bidirectional Marine Water Pump, suitable for both clockwise and counterclockwise operation. Perfect for retrofitted systems and generator sets.

Each pump is 100% new (not rebuilt), ensuring dependable function without the risk of core-related failures. These pumps are compatible with Cummins 6CTA, 6CT8.3, and other C Series engines found in commercial vessels, workboats, fishing trawlers, and passenger ferries.

Marine Water Pump Impellers for Cummins C Series Engines

The impeller is the heart of your raw water pump. Over time, these flexible blades wear down due to sand, scale, and thermal cycling. Diesel Pro Power provides high-performance marine impellers to match both keyed and splined shafts for Cummins water pumps.

Key Shaft Impeller

• 3-½" Height

• 2-⅞" Width

• 3-5/16" Overall Diameter

• Designed for secure fit on keyed drive shafts

Splined Shaft Impeller

• 12-blade design for superior water flow

• 2-⅞" Depth and 3-5/12" Diameter

• Compatible with splined marine pump configurations

Both impeller types are marine-grade and engineered to resist saltwater degradation. Always carry a spare to prevent unplanned downtime.

Mounting & Seal Components

Marine Water Pump Gasket

Secure your pump to the mounting plate with a high-grade gasket engineered for marine use. These gaskets create a watertight seal between the pump and engine, minimizing the risk of coolant leaks that could damage internal components.

Water Pump O-Rings

Each Cummins 6CTA water pump uses O-rings at the inlet and outlet ports to ensure leak-free operation. Replace both O-rings whenever servicing or replacing the pump. Sold in sets of two, one for each port.

Heat Exchangers and Cooling System Integration

The raw water cooling system interfaces directly with the heat exchanger to manage engine operating temperature. Diesel Pro Power offers:

Complete Heat Exchanger Assembly

Brand-new heat exchangers designed for Cummins 6CTA marine engines offer optimal heat transfer efficiency and corrosion resistance. These are ideal for complete replacements or new installations.

Heat Exchanger Gaskets

Replace aged gaskets when servicing or installing a new exchanger. Compatible with Cummins 6C, 6CT, 6CTA, QSC, L10, and QSL engines. 5” diameter sealing surface ensures perfect fitment.

Thermostats for Cummins 6CTA Cooling Systems

Temperature regulation is critical for performance and emissions. We carry both standard and vented thermostats for Cummins C Series marine engines:

• Standard Thermostat: Opens at 180°F, helping maintain optimal operating temperature.

• Vented Thermostat: Also opens at 180°F but includes a bypass vent for improved cold start flow and rapid warm-up.

Use genuine-style thermostats during routine service intervals or if experiencing overheating.

Marine Cooling System Tools

Impeller Puller Tool

Designed to safely remove marine water pump impellers without damaging blades or shafts. Works with a wide range of Cummins, Detroit Diesel, and other marine pump brands. A must-have for any onboard maintenance kit.

Sea Water Hoses & Hose Fittings

Proper hose routing ensures unrestricted flow of raw water through the pump, heat exchanger, and exhaust system. We stock all essential hoses:

Plain Hoses

• For pump inlet and heat exchanger outlet connections

• Designed to withstand saltwater, heat, and vibration

• Available for Cummins 6C, 6CT, and 6CTA engines

Hose Elbows

Custom-shaped elbows designed for tight engine room spaces. Used to connect sea water pump tubes to the exhaust manifold outlet or heat exchanger input.

Silicone Coolant Hoses – Full Sizing Range

Marine-grade silicone hoses are flexible, heat-resistant, and designed to outperform rubber in marine cooling systems. All hoses are 1 foot long and available in sizes ranging from 1” to 4” inner diameter:

• 1", 1-¾", 1-⅞", 2", 2-⅛", 2-¼", 2-⅜", 2-½", 2-¾", 3", 3-½", and 4"

• Ideal for high-heat, high-vibration applications

Use silicone coolant hoses for sea water routing between strainers, pumps, heat exchangers, and exhaust elbows.

Hose Clamps – Secure Your Cooling Lines

Properly securing every hose connection is vital to prevent leaks under pressure. Diesel Pro Power carries a full line of stainless steel hose clamps compatible with Cummins marine cooling systems.

Clamp Sizes Include:

• Minimum 9/16" to Maximum 1-1/16"

• 13/16" to 1-¾"

• 11/16" to 1-¼"

• 1" to 1.5"

• 1-5/16" to 2-¼"

• 1-9/16" to 2-½"

These clamps are corrosion-resistant and built for long-term marine use, including both fuel and water applications.

Anodes & Corrosion Protection for Cummins Cooling Systems

Zinc Anodes for Heat Exchangers and Aftercoolers

Marine raw water systems are susceptible to galvanic corrosion. Protect your components with sacrificial zincs:

• For Cummins and Detroit Diesel Heat Exchangers: NPT ½", 2" length

• For Fuel and Oil Coolers: NPT ⅜", 1" length

Zincs should be inspected and replaced regularly as part of your preventative maintenance plan.

Raw Water Intake Strainers

Before water ever reaches your engine, it passes through a strainer. These strainers catch debris such as seaweed, sand, and shells that could damage impellers or clog heat exchangers.

Available Intake Strainer Sizes:

• 1” Pipe Size (9 ½” height x 5 ½” width)

• 1 ½” Pipe Size (11 ½” height x 7 ¼” width)

• 2” Pipe Size (16” height x 7 ½” width)

• 2 ½” Pipe Size (16” height x 7 ½” width)

Each strainer features marine-grade construction with removable screens for easy cleaning. Choose a strainer based on the inlet size of your sea water pump.

Why Marine Cooling Systems Matter on Cummins 6CTA Engines

Raw water cooling systems are fundamental to the health and performance of Cummins 6CTA marine engines. Saltwater is drawn through the intake, routed through a heat exchanger to cool the engine coolant, then discharged with the exhaust.

Key benefits of maintaining your 6CTA raw water system include:

• Reduced Risk of Overheating: Clean strainers, fresh impellers, and proper hose routing ensure unrestricted cooling flow.

• Longer Engine Life: Proper temperature regulation prevents thermal stress and premature wear.

• Improved Fuel Efficiency: Engines running at optimal temperature burn cleaner and more efficiently.

• Reduced Maintenance Costs: Routine service of strainers, impellers, and clamps avoids major repair bills.

Applications of the Cummins 6CTA in Marine Vessels

The Cummins 6CTA8.3 and 6CTA8.3-M2 engines are widely used in:

• Commercial Fishing Vessels

• Passenger Ferries

• Tugboats and Pushboats

• Pilot Boats

• Charter Yachts

• Military Patrol Craft

These engines operate in variable load environments where cooling reliability is paramount. Our selection of water pump components is trusted by over 40,000 satisfied customers worldwide.