Parts for Detroit Diesel 371 Non-Turbo - (2 Valve Head Type) - Marine Water Pump Section

Parts for Detroit Diesel 3-71 Non-Turbo (2 Valve Head Type) – Marine Water Pump Section

The Detroit Diesel 3-71 engine, part of the legendary Series 71 family, is a robust and enduring powerplant designed to perform under extreme marine conditions. Its dependability and straightforward design make it a staple in commercial vessels, workboats, and classic yachts. Proper cooling is essential for these engines, and maintaining the marine water pump system ensures that the 3-71 continues to operate within ideal temperature ranges. Diesel Pro Power provides a full selection of water pump and cooling system parts engineered specifically for the Detroit Diesel 3-71 Non-Turbo (2 Valve Head Type). Each component—from the raw water pump itself to thermostats, impellers, gaskets, and zinc anodes—is designed to maintain OEM-level reliability while extending engine longevity in marine environments.

Marine Water Pump Overview for Detroit Diesel 3-71 Non-Turbo Engines

The marine water pump, also known as the raw water pump, is at the heart of the Detroit Diesel 3-71 cooling system. It draws seawater from outside the vessel and circulates it through the heat exchanger, which keeps the engine temperature steady. This process prevents overheating and ensures continuous, safe performance even under heavy loads or in high-temperature climates.

At Diesel Pro Power, you can find both new and rebuilt bidirectional marine water pumps designed for the Detroit Diesel 3-71. Each pump can rotate either clockwise or counterclockwise, making installation straightforward regardless of your engine setup. Every pump comes complete with a drive gear and mounting adapter, saving you time during installation and ensuring a perfect fit. The 1” flange port type is optimized for the cooling demands of the 3-71 engine, delivering a steady, efficient seawater flow rate.

Why the Water Pump Is Critical

Marine water pumps serve as the first line of defense against overheating. A failing pump can quickly lead to engine damage, warped cylinder heads, and oil breakdown. Common signs of wear include leaks around the shaft seal, unusual noises, or decreased water pressure at the outlet. Regular inspection and replacement of the impeller and seals are crucial maintenance steps to avoid costly repairs.

Raw Water Pump Components and Service Parts

Marine Water Pump for Detroit Diesel 3-71 Non-Turbo

• Type: Bidirectional, turns right or left

• Port Type: 1” flange

• Included: Drive gear and mounting adapter

• Use: Designed specifically for Detroit Diesel 3-71 engines used in marine configurations

This pump is engineered to meet the rugged demands of saltwater operation, with corrosion-resistant materials and a precision-machined housing. The bidirectional design ensures compatibility across various configurations without needing to modify engine rotation.

Gasket for Marine Water Pump

A marine water pump gasket seals the pump housing, preventing leaks where the pump connects to the mounting surface. Diesel Pro’s gaskets are cut from high-durability materials that withstand constant temperature cycles and exposure to saltwater spray.

Impeller for Detroit Diesel Marine Water Pumps

The impeller is the core of the raw water pump. Diesel Pro offers a 10-blade impeller with a 12-spline drive, specifically designed for the Detroit Diesel 3-71’s cooling system. With a diameter of 2 ½ inches and height of 2 inches, this impeller maintains the correct water flow to the heat exchanger. Replacing the impeller annually or every 250 hours of operation helps ensure consistent performance.

Seal for Marine Water Pump

Every raw water pump relies on shaft seals to keep seawater contained and prevent contamination of the pump bearings. Diesel Pro’s seal for 1” inlet/outlet pumps with a 2” impeller ensures reliable sealing and long service life under constant marine exposure.

Adapter Gasket and Flywheel Housing Gasket

Supporting components like adapter gaskets (used on 3-71 and related series engines such as 4-71, 6-71, and 2-71) ensure perfect alignment between the pump and engine housing. Diesel Pro’s gaskets for the flywheel housing to salt water pump connection maintain a secure, watertight seal between metal surfaces prone to vibration and thermal expansion.

Thermostats and Temperature Control Components

The Detroit Diesel thermostat is designed to maintain an optimal engine temperature—typically 173°F for most 3-71 engines. Maintaining this temperature ensures the fuel system performs efficiently and prevents excessive wear. Diesel Pro Power offers thermostats, thermostat housing gaskets, and related seals designed for perfect fit and performance in Detroit 3-71, 4-71, and 6-71 engines.

Thermostats are simple yet vital components. When operating temperatures rise, the thermostat opens, allowing coolant or seawater to circulate through the heat exchanger. When temperatures drop, it closes to help the engine warm up efficiently. Periodic inspection and replacement are recommended for consistent operation.

Heat Exchanger and Cooling Tank Components

Marine Heat Exchange Tank

Diesel Pro’s marine heat exchange tanks for the Detroit Diesel 3-71, 4-71, and 6-71 series are precision-engineered to transfer heat efficiently. The used and refurbished units offered are pressure-tested to ensure structural integrity and performance equal to new units.

Heat Exchanger Core

The core is where heat transfer occurs. Seawater circulates through the core, absorbing engine heat and discharging it overboard. A clean, well-maintained core ensures efficient cooling and stable engine operation. Diesel Pro provides replacement cores built from marine-grade copper-nickel alloy for superior corrosion resistance.

Heat Exchanger Gasket Kit

This kit includes every seal and gasket needed to service or rebuild your heat exchanger. Designed for 53, 71, and 92 series engines, the kit helps eliminate leaks that could cause coolant contamination or inefficient cooling.

Glands and Seals

Supporting parts like tank glands and heat exchanger seals (used in pairs) ensure tight, reliable connections where pipes and tanks meet. These parts are small but vital for preventing coolant loss and maintaining pressure integrity within the system.

Zinc Anodes and Corrosion Prevention

Zinc Anodes for Detroit Diesel Marine Systems

Marine engines constantly fight galvanic corrosion, caused by the electrical interaction between metal components in saltwater. Zinc anodes—often referred to as “sacrificial anodes”—protect the rest of the cooling system by corroding first. Diesel Pro offers a range of zincs for:

• Marine water pumps

• Fuel coolers and oil coolers

• Heat exchangers and aftercoolers

Each zinc plug features threaded brass fittings for easy installation. Replacing these anodes regularly is crucial—when they wear down by 50% or more, they should be replaced to continue providing effective protection.

Radiator Components and Cooling Accessories

The Detroit Diesel 3-71’s marine configuration often incorporates a closed-loop cooling system with a heat exchanger, radiator-style core, and connecting hoses. Diesel Pro supplies:

• Radiator gaskets in multiple sizes (for both small and standard applications)

• Radiator caps rated for 7 lbs of pressure

• Radiator necks precision-fit for 1.63” inside diameter openings

These components ensure secure sealing, proper coolant flow, and consistent pressure regulation within the system.

Silicone Coolant Hoses and Clamps

Premium Silicone Coolant Hoses

Diesel Pro’s high-temperature silicone hoses are resistant to cracking, softening, and chemical damage caused by coolant or seawater. Available in sizes ranging from 1” to 4” inside diameter, each hose section is 1 foot long, providing flexibility for replacement or custom installations.

Silicone hoses outperform traditional rubber in marine applications thanks to their ability to handle extreme temperature swings and pressure variations. They’re ideal for both seawater and coolant lines.

Hose Clamps

To complement the hoses, Diesel Pro carries stainless-steel hose clamps in a wide range of diameters—from 9/16” to 3”. Each clamp provides secure fastening, preventing leaks and ensuring that hoses remain sealed under vibration and heat cycling.

Additional Cooling System Components

Oil Cooler Gaskets

Oil cooler water inlet gaskets prevent leaks between the cooling and lubrication systems, ensuring clean oil and stable operating temperatures.

Intake Water Strainers

A 1.5-inch intake water strainer ensures that debris, sand, and marine growth don’t enter the raw water system. Its durable brass and stainless-steel construction ensures long-term protection for your water pump and heat exchanger.

Detroit Diesel Green Paint

To finish off your cooling system restoration or rebuild, Diesel Pro offers Detroit Diesel Green engine paint, matching the original OEM color. It resists corrosion, oil, and heat—perfect for maintaining the authentic appearance of your marine engine room.

Why Buy Detroit Diesel 3-71 Marine Water Pump Parts from Diesel Pro Power

Diesel Pro Power has earned the trust of over 40,000 satisfied customers worldwide, serving both individual boat owners and large commercial fleets. Every part is carefully selected and tested for compatibility and reliability. Here’s why Diesel Pro stands out as the preferred supplier:

1. Guaranteed Compatibility

Every component is designed to meet or exceed OEM specifications for the Detroit Diesel 3-71 Non-Turbo engine, ensuring seamless installation and reliable operation.

2. Worldwide Shipping and Fast Delivery

Diesel Pro ships globally, with most orders leaving the warehouse within 24 hours. Whether your vessel is in Miami, Singapore, or Rotterdam, you can expect timely delivery and consistent service.

3. Comprehensive Product Support

Each product page includes installation details, technical specifications, and compatibility information. Diesel Pro’s expert support team is available to help identify the exact parts needed for your engine’s configuration.

4. Trusted Quality and Durability

From the impeller blades to the last zinc anode, every part is made with corrosion-resistant materials and tested under marine conditions. Diesel Pro ensures your cooling system performs at its peak for years to come.

5. Simplified Online Shopping

The DieselPro.com platform offers intuitive navigation, clear visuals, and secure checkout. Finding and purchasing Detroit Diesel 3-71 marine water pump parts has never been easier.