Detroit Diesel 4-71 Non-Turbo - 2 Val Marine Water Pump - Aftermarket

Parts for Detroit Diesel 471 Non-Turbo (2-Valve Head Type) – Marine Water Pump Section

The Detroit Diesel 4-71 Non-Turbo engine remains one of the most trusted powerplants in the history of marine propulsion. Known for its rugged two-stroke design, dependability under continuous load, and impressive torque at low RPM, this classic Detroit Diesel model has powered tugboats, fishing vessels, workboats, and pleasure craft for decades. Maintaining optimal cooling performance on these engines is essential for reliability and longevity—and that’s where the marine water pump system plays a critical role.

The following catalog provides a comprehensive guide to raw water pumps, replacement impellers, gaskets, seals, thermostats, heat exchangers, zinc anodes, hoses, and other marine cooling components specifically designed for the Detroit Diesel 471 Non-Turbo (2-Valve Head Type) engine. Every part listed below is engineered or remanufactured to OEM-level standards and offered exclusively through Diesel Pro Power, the world’s most trusted online store for Detroit Diesel marine parts with over 40,000 satisfied customers worldwide.

Marine Water Pumps for Detroit Diesel 471 Non-Turbo Engines

The heart of any marine cooling system is the raw water pump, often referred to as the sea water pump. It draws cool sea water into the system, circulating it through the heat exchanger and other components to regulate engine temperature. Maintaining a healthy pump is essential to prevent overheating and damage to vital components.

New Marine Water Pump – For Detroit Diesel 53 & 71 Series

This new bidirectional marine water pump is fully compatible with Detroit Diesel 471 Non-Turbo engines. Its bidirectional design means it can rotate in either direction, accommodating both left-hand and right-hand engine configurations.

• Port Type: 1" flange

• Includes: Drive gear and mounting adapter

• Material: Marine-grade bronze and stainless steel for corrosion resistance

• Performance: Designed to maintain consistent water flow under continuous operation

This pump is ideal for customers seeking a reliable, long-term replacement with factory-new quality. Perfect for marine operators who prioritize dependability and performance over short-term cost savings.

Rebuilt Marine Water Pump – For Detroit Diesel 53, 71, and 92 Series

The rebuilt bidirectional water pump offers an economical alternative without compromising performance. Every rebuilt unit is fully disassembled, cleaned, inspected, and reassembled with new seals, bearings, and wear components.

• Port Type: 1-1/2" flange

• Includes: Adapter and drive gear

• Impeller Height: 2-1/2"

• Rotation: Right or left hand

Rebuilt pumps from Diesel Pro Power come with a refundable core deposit, encouraging sustainable reuse of housing cores while ensuring customers receive a pump restored to OEM operating condition.

Premium Marine Water Pump – For Detroit Diesel 53, 71, and 92 Series

For operators who want the highest level of reliability, this premium-grade pump combines the precision of a new unit with the robust materials of a heavy-duty marine application.

• Impeller Height: 2-1/2"

• Bidirectional rotation capability

• Port Type: 1-1/2" flange

• Includes: Adapter and drive gear

• Applications: Ideal for continuous duty and high-load marine environments

This pump ensures long-lasting performance under harsh saltwater exposure, making it perfect for commercial fishing vessels or passenger boats that run daily.

Impellers and Repair Kits

Replacement Impellers

The impeller is the rotating heart inside your raw water pump. Replacing it regularly—typically every season or 100 hours of operation—helps maintain proper cooling efficiency.

• Large 12-blade impeller:

• Diameter: 3-3/4"

• Height: 2-1/2"

• 12-spline drive

• Compatible with Detroit Diesel and Volvo Penta pumps

• Standard 10-blade impeller:

• Diameter: 2-1/2"

• Height: 2"

• For Detroit Diesel raw water pumps with 1" inlet and outlet

Each impeller is molded from durable neoprene rubber designed to withstand saltwater corrosion, heat, and abrasion.

Marine Water Pump Repair Kit

Diesel Pro Power’s marine water pump repair kit for the Detroit Diesel 6-71, 6V71, and related engines includes seals, gaskets, bearings, and other internal components for a full overhaul of pumps with 2-1/2" impeller height. It’s the best option for restoring your existing pump to like-new performance.

The repair kit helps prevent leaks, restore pressure, and extend pump life while avoiding the cost of a full replacement.

Gaskets and Seals for the Cooling System

Proper sealing ensures water pressure and flow are maintained throughout the cooling circuit. Diesel Pro Power offers factory-grade gaskets made from premium materials that resist breakdown under heat and salt exposure.

Thermostat and Housing Gaskets

• Thermostat Housing Gasket: Seals the housing to the cylinder head, preventing leaks.

• Thermostat Gasket: Ensures a proper seal for the thermostat element, maintaining steady coolant temperature.

Marine Water Pump Gaskets

• Adapter Gasket: Used when mounting the pump to the engine block.

• Plate Gasket: Provides a seal for the pump’s cover plate.

• Mounting Gasket: Ensures a tight seal at the pump’s mounting flange.

• Flywheel to Salt Water Pump Gasket: Prevents leaks where the pump interfaces with the flywheel housing.

Seals and Bearings

• Mechanical Seal: Prevents water leakage around the rotating shaft.

• Bearing Oil Seal: Keeps lubricant inside the bearing housing, extending bearing life.

• Wear Plate: Protects the pump housing from erosion due to constant impeller contact.

• Coupling (21-tooth): Ensures efficient drive power transfer between the accessory drive and water pump.

Each gasket and seal meets OEM fitment standards for Detroit Diesel 471 engines, ensuring easy installation and leak-free performance.

Thermostats and Temperature Regulation

Maintaining precise operating temperature is critical for optimal fuel efficiency and reduced wear. Diesel Pro Power’s Detroit Diesel thermostat for the 3-71, 4-71, and 6-71 series opens at 173°F, allowing the cooling system to stabilize before cold seawater flows in full circulation.

A properly functioning thermostat helps the engine reach operating temperature faster and protects internal components from thermal shock when running in cold marine conditions.

Heat Exchangers and Cooling Tanks

The marine heat exchanger acts as the boundary between the closed coolant circuit and raw seawater. The 471 Non-Turbo relies on efficient heat transfer to prevent overheating under heavy loads.

• Heat Exchanger Core: OEM-spec replacement designed to handle marine corrosion.

• Heat Exchanger Gasket Kit: Includes all seals required for complete maintenance.

• Marine Heat Exchange Tank (used): Factory-inspected and pressure-tested for leaks.

• Gland and Seal Sets: Maintain water-tight integrity in the exchanger tank assembly.

By regularly maintaining the heat exchanger and replacing gaskets and zincs, operators can significantly extend the service life of the entire cooling system.

Zinc Anodes and Corrosion Protection

Zinc anodes are vital for preventing galvanic corrosion in saltwater environments. Each zinc piece acts as a sacrificial element, protecting your Detroit Diesel’s expensive metal components from electrolysis damage.

• Heat Exchanger Zincs: NPT 3/4" plugs with zinc lengths up to 3-3/8"

• Marine Water Pump Zincs: NPT 1/2" and 3/4" plugs, lengths from 2" to 3-3/8"

• Fuel and Oil Cooler Zincs: NPT 1/8" and 3/8" plugs for cooler protection

Replacing zincs every six months—or sooner in warm, brackish waters—is an inexpensive way to prevent thousands of dollars in corrosion damage.

Hoses, Clamps, and Cooling Accessories

Silicone Coolant Hoses

Diesel Pro Power’s silicone coolant hoses are built to handle marine temperatures and resist salt corrosion. Each hose section is one foot long and available in a variety of inside diameters from 1" to 4".

Silicone hoses outperform standard rubber, providing flexibility, temperature stability, and longer service life in tight engine compartments.

Stainless Hose Clamps

A range of stainless-steel clamps ensures secure hose connections throughout the cooling and fuel systems. Each clamp is precision-made to handle the vibrations and pressure changes of marine environments. Diameter ranges cover everything from small 9/16" lines to large 3" coolant hoses.

Radiator Components

• Radiator Gaskets: Seal the joints between radiator tanks and cores.

• Radiator Caps & Necks: Maintain 7 lbs of system pressure for proper coolant circulation.

These components help prevent air leaks, maintain pressure, and ensure the closed-loop portion of the cooling system operates efficiently.

Marine Cooling Accessories and Paint

Intake Water Strainers

An intake water strainer protects your raw water pump from debris and marine growth by filtering seawater before it enters the system. The 1.5" model offered by Diesel Pro Power features corrosion-resistant materials, a removable basket, and easy-to-service design.

Detroit Diesel Green Paint

Keep your engine looking factory-fresh with authentic Detroit Diesel Green paint, formulated to match the original factory finish. This marine-grade paint resists oil, salt spray, and heat, preserving the iconic appearance of Detroit Diesel engines for years.

Why Buy Your Marine Water Pump and Cooling Parts from Diesel Pro Power

Choosing the right marine water pump for your Detroit Diesel 471 Non-Turbo isn’t just about compatibility—it’s about trust, expertise, and reliability. Diesel Pro Power has specialized in Detroit Diesel parts for decades, serving more than 40,000 satisfied customers worldwide.

Here’s why professionals and boat owners alike choose Diesel Pro:

1. OEM-Quality and Tested Reliability

Every pump, impeller, and gasket we sell meets or exceeds Detroit Diesel factory standards. Our rebuilt pumps undergo comprehensive testing to ensure they deliver the same flow rate and pressure as new units.

2. Global Shipping and Same-Day Processing

Diesel Pro Power ships globally and fulfills most orders the same day they’re placed. Whether you’re docked in Miami, Nassau, or Singapore, your marine water pump and parts can be on their way immediately.

3. Expert Technical Support

Our experienced team understands every generation of the Detroit Diesel 71 Series and can guide you in selecting the right parts. We ensure compatibility whether your engine powers a commercial trawler, yacht, or workboat.

4. Massive Inventory and Easy Ordering

All parts listed here are in stock, ready to ship. The Diesel Pro website offers real-time availability, clear product images, and secure online checkout for fast purchasing.

5. Long-Term Marine Performance

When your engine relies on seawater for cooling, reliability matters most. Diesel Pro’s marine pumps, seals, and heat exchanger kits are designed to perform in the harshest saltwater environments, reducing downtime and costly repairs.