Raw Water Pumps for Cummins QSC Marine Engines
Gear-Driven Marine Water Pump (C Series / QSC)
This marine water pump is built for Cummins C Series and QSC engines, including models like the 6CTA8.3-M and QSC8.3-M2. It is a gear-driven seawater pump with mounting holes offset 16° from the center shaft, designed to fit marine engine installations where clearance and access are limited.
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Durable bronze body and stainless internal hardware
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Designed for continuous duty in high-salinity environments
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Common on vessels using Cummins 6C, ISC, and QSC powerplants
Ideal for commercial vessels that demand rugged durability and long service intervals.
Bidirectional Marine Raw Water Pump (QSC / QSL / QSB Compatible)
This versatile raw seawater pump works across multiple Cummins marine engine platforms, including QSC, QSL, QSB, and legacy B and C Series. Mounting holes are 11° offset, and the pump is bidirectional, making it ideal for installations requiring clockwise or counterclockwise shaft rotation.
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Ports: 1 ¾” flange connection
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Bronze and stainless corrosion-resistant design
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Includes integrated drive gear for direct coupling to camshaft
Perfect for rebuilds or repowers requiring adaptable pump configurations.
Cummins Marine Seawater Pump for QSC & QSL (With O-Ring)
This premium seawater pump includes the mounting O-ring for leak-free installation. Designed specifically for Cummins QSC and QSL marine engines, it delivers superior flow for larger heat exchangers or aftercooler-equipped systems.
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Fully assembled and pressure tested
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Drop-in replacement for factory pump
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Reliable for both freshwater and seawater cooling loops
Raw Water Pumps for Cummins QSL Marine Engines
Whether you’re replacing a worn-out pump or upgrading for increased durability, our selection of raw water pumps is engineered to meet or exceed Cummins’ marine standards.
Bidirectional Marine Water Pump for Cummins QSL, QSB, and C-Series Engines
This pump features 11° offset mounting holes from the drive gear shaft center and supports bidirectional rotation, making it compatible with both left-hand and right-hand engine configurations. It comes with a 1 3/4” flange port, ensuring high flow for saltwater cooling systems.
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Compatible with Cummins B, C, QSB, and QSL marine engines
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Machined to precision for perfect fit and reduced vibration
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Marine-grade materials resist corrosion from constant saltwater exposure
Cummins Marine Seawater Pump for QSC and QSL
Designed specifically for the Cummins QSC and QSL platforms, this raw water pump includes a pre-mounted O-ring for leak-free installation. It’s engineered for robust service in marine cooling systems, ensuring consistent seawater intake under variable load conditions.
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Direct-fit for QSL and QSC marine engine applications
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Manufactured to handle high RPMs and marine thermal loads
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Saltwater corrosion resistant with marine-rated seals and bearings
Impellers, O-Rings & Gaskets for QSL Water Pump Systems
To support long-term use and prevent premature failure, it’s essential to replace impellers and seals as part of regular engine maintenance.
Marine Water Pump Impeller – Spline Shaft Style
This impeller is engineered with a 14-tooth spline and features a 4-inch width with a 3 3/4” outside diameter. The marine-grade rubber compound resists breakdown from saltwater and heat, ensuring consistent flow rate through the raw water circuit.
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Precision spline connection for high torque transfer
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Ideal for QSL and QSC seawater pump replacements
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Reduced cavitation and improved cooling performance
Mounting Gasket for Cummins Marine Raw Water Pump
Proper installation of your raw water pump requires the right gasket. This marine-rated gasket ensures a tight seal to prevent air or coolant leaks at the pump flange, maintaining system pressure and cooling efficiency.
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Designed to handle saltwater exposure
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Leak-free performance across varying temperatures
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Easy installation with factory-match alignment
Inlet and Outlet O-Rings for Cummins QSL Water Pump
Each QSL marine engine requires two O-rings for proper sealing of inlet and outlet ports on the raw water pump. These high-quality O-rings are formulated to resist swelling and deterioration due to saltwater and coolant exposure.
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Durable, long-lasting elastomer formulation
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Sold as a pair; two required per engine
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Fits QSB4.5, QSB6.7, 6CT8.3, ISC, QSC, and QSL engines
Thermostat & Heat Exchanger Gaskets for Cummins QSL
Thermal regulation is essential to prevent engine overheating and maintain consistent operating temperature in marine applications. Diesel Pro Power stocks all major sealing and temperature control components for Cummins QSL engines.
Thermostat – 180 Degree
This 180° thermostat is designed for marine-duty Cummins QSL, ISL, ISC, and QSC engines. It regulates coolant flow through the engine and heat exchanger, opening and closing based on temperature thresholds to protect against overheating and cold shock.
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Precise temperature calibration for optimal engine efficiency
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Marine-grade durability against thermal cycling
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Reliable opening/closing under load
Heat Exchanger Gasket – Cummins QSL & QSC
Sealing the joint between the heat exchanger and the block or adapter housing, this 5” diameter gasket is built to resist coolant pressure and saltwater corrosion, maintaining a leak-free interface.
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Designed for Cummins 6C, 6CT, 6CTA, QSC, L10, and QSL engines
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Compatible with OEM heat exchanger configurations
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Easy to install with factory-style sealing surfaces
Marine Cooling Accessories: Intake Strainers for QSL Engines
Strainers prevent debris from entering the raw water system, protecting the impeller and internal components of the seawater pump.
Intake Water Strainers – Multiple Sizes Available
Diesel Pro offers marine intake strainers in 1″, 1.5″, 2″, and 2.5″ pipe sizes. These strainers are crafted from corrosion-resistant materials and are built for high-flow marine cooling applications. Dimensions range from 9.5” to 16” in heightand 5.5” to 7.5” in width, depending on model.
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Protect raw water pump and cooling system from debris
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Easy-access screens for maintenance
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Rugged marine-grade housing for long life in saltwater environments
Zinc Anodes for QSL Marine Heat Exchangers & Aftercoolers
Zinc anodes help prevent electrolysis and galvanic corrosion inside your cooling system. Diesel Pro’s marine zincs fit Cummins QSL heat exchangers and aftercoolers, and feature a standard 1/2” NPT brass plug mount with a 2” zinc element.
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Sacrificial protection to extend component life
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Easy thread-in installation
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Compatible with Cummins and Detroit Diesel marine systems
Cooling System Hoses & Silicone Connectors
Marine environments demand flexible, high-temperature coolant hoses. Our silicone hoses are resistant to UV exposure, saltwater spray, and repeated heating/cooling cycles.
Marine-Grade Silicone Coolant Hoses – 1″ to 4″ Diameters
Available in 1″ to 4″ internal diameters, these hoses are sold in 1-foot lengths and can be cut to size. They’re reinforced for pressure resistance and are compatible with seawater, coolant, and antifreeze mixtures.
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Ideal for QSL marine cooling systems
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Maintains flexibility in extreme temperatures
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Built to outlast standard rubber hoses
Hose Clamps for Marine Coolant Lines
Diesel Pro offers a complete range of marine-grade clamps for securing coolant and seawater hoses in QSL engine cooling systems. Each clamp offers a specified effective diameter range to ensure a tight, leak-free connection.
Stainless Steel Clamps – 9/16″ to 3″ Ranges
Choose from multiple size ranges:
All clamps are corrosion-resistant and designed to withstand vibration and saltwater exposure.
Why Choose Diesel Pro Power for QSL Marine Cooling Parts?
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40,000+ satisfied customers worldwide
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Fast shipping from in-stock inventory
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Expert support for Cummins marine engines
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Top-rated quality with marine-specific materials
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Trusted for both commercial and recreational marine operations
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