Detroit Diesel 6-71 Turbo Fresh Water Pump & Cooling System Parts Catalog

The Detroit Diesel 6-71 Turbo engine is a powerful two-stroke inline-six workhorse that has powered countless marine vessels, generators, and heavy-duty industrial applications. Known for its distinctive sound, high torque output, and long service life, the 6-71 Turbo continues to be a trusted engine across the globe. To maintain its performance, the cooling system — especially the fresh water pump — plays an essential role in keeping the engine at optimal operating temperature.

At Diesel Pro Power, you’ll find a complete selection of Detroit Diesel 6-71 Turbo water pumps, repair kits, gaskets, seals, hoses, thermostats, and accessories — all built to OEM-equivalent or higher quality standards. Whether you’re maintaining a marine propulsion system, a stationary generator, or a high-performance industrial unit, our catalog ensures you’ll find every component you need for reliable cooling system operation.

Understanding the Detroit Diesel 6-71 Turbo Cooling System

The Detroit Diesel 6-71 Turbo cooling system consists of a closed-circuit fresh water (coolant) loop and a raw water heat exchanger setup in marine configurations. The fresh water pump is the heart of this system, continuously circulating coolant through the engine block, cylinder head, oil cooler, and heat exchanger. Proper coolant flow ensures even heat distribution and prevents thermal stress on internal engine components such as pistons, liners, and valves.

In turbocharged versions of the 6-71, heat management becomes even more critical due to the additional exhaust gas temperature generated by the turbocharger. A high-capacity water pump — like those featured in this catalog — is specifically designed to handle the increased thermal load, ensuring consistent coolant flow under high boost conditions.

High-Capacity Water Pumps for Detroit Diesel 6-71 Turbo

Right-Hand Rotation Pump

Detroit Diesel 6-71 Turbo High-Capacity Water Pump – Right-Hand Rotation
This new, heavy-duty right-hand rotation water pump is engineered for turbocharged configurations of the 6-71 series. It features precision-cast impellers, corrosion-resistant internal surfaces, and bearings designed for high-speed operation. The right-hand pump is typically used in starboard marine installations or in certain industrial layouts where rotation direction aligns with auxiliary systems.

Key Features:

• Designed for 6-71 turbo engines only

• New, not rebuilt

• High-capacity flow rate for enhanced heat dissipation

• Durable bearings and seals for extended lifespan

• OEM-grade fit and performance

Left-Hand Rotation Pump

Detroit Diesel 6-71 Turbo High-Capacity Water Pump – Left-Hand Rotation
This left-hand rotation version mirrors the right-hand design but rotates counter to it, suitable for port-side marine engines or installations requiring reversed rotation. Like its counterpart, it features upgraded seals and impeller geometry for high-efficiency coolant circulation.

Key Features:

• Suitable for 6-71 Turbo engines

• Precision-balanced impeller for reduced vibration

• Long-life water seal and bearing assemblies

• Direct bolt-on replacement for original units

Water Pump Gaskets, Seals & Flanges

Pump Gasket

Detroit Diesel Pump Gasket – This essential sealing component ensures a tight fit between the water pump and engine housing, preventing coolant leaks under pressure. Made from high-temperature-resistant materials, it maintains integrity even under continuous load conditions.

Pump Flange

Detroit Diesel Fresh Water Pump Flange (471/671 Turbo) – Designed for the 71 Series Turbo engines, this flange features a 1.764” internal diameter and is built from durable cast metal to maintain a secure connection between the pump and coolant lines.

Water Pump Repair Kit

Detroit Diesel 6-71 Turbo Water Pump Repair Kit (New Style Seal) – This kit includes bearings, seals, and gaskets needed to fully rebuild the fresh water pump. The upgraded “new style” seal provides superior protection against leakage and contamination compared to older designs.

Ideal for:

• Preventive maintenance during scheduled overhauls

• Field rebuilds without full pump replacement

• Marine and industrial 6-71 Turbo applications

O-Rings and Secondary Seals

O-rings such as the Water Pump Outlet O-Ring and Water Manifold to Oil Cooler Housing Seals (available in multiple diameters) maintain watertight connections throughout the system. These seals prevent coolant and oil mixing, which could lead to contamination and engine wear.

Thermostats & Gaskets

Proper temperature regulation is vital for engine longevity and efficiency. The Detroit Diesel Thermostat (173°F)opens at the ideal operating temperature to maintain consistent coolant flow through the system. Supporting components like the Thermostat Housing Gasket and Thermostat Gasket ensure leak-free installation.

Features:

• Reliable operation at 173°F (78°C) opening temperature

• Corrosion-resistant metal body

• Precision sealing for consistent thermal control

By maintaining the correct coolant temperature, these components help reduce wear on pistons, liners, and turbocharger bearings, all of which can suffer from heat-induced damage if the thermostat malfunctions.

Cooling System Seals & Connections

The Water Seal components in this catalog feature multiple sizes to fit between various manifolds, oil coolers, and pump housings. Built from high-grade elastomers, they maintain flexibility and sealing integrity under vibration, thermal expansion, and coolant exposure.

Popular examples include:

• Water Manifold to Oil Cooler Housing Seals (2 1/2" and 2 3/4" OD)

• Water Seal (2 3/16" OD) with internal lip for tight, long-lasting fit

Radiators, Caps & Related Components

In industrial configurations, the Detroit Diesel 6-71 Turbo uses a heavy-duty radiator instead of a marine heat exchanger. Diesel Pro Power supplies OEM-spec radiators, caps, and necks for these setups.

Radiator (Industrial)

Designed for stationary and mobile industrial engines, this radiator ensures continuous thermal regulation under long duty cycles. Constructed with copper-brass cores or high-efficiency aluminum fins, it provides optimal heat transfer.

Radiator Caps and Necks

The Detroit Diesel Radiator Cap (7 lb Pressure) maintains system pressure to prevent coolant boiling and improve circulation efficiency. Matching neck assemblies (small and large diameters) ensure precise fitment with your cooling system configuration.

Water Bypass Tubes

The Detroit Diesel Water Bypass Tube (Thermostat Connection) is an often-overlooked yet critical part of the cooling loop. It enables a controlled bypass of coolant when the thermostat is closed, ensuring consistent engine temperature and preventing localized hot spots.

Coolant Hoses & Clamps

Diesel Pro Power offers a complete line of silicone coolant hoses ranging from ¾” to 4” in diameter, sold in one-foot lengths for custom installation flexibility. Silicone construction provides excellent resistance to heat, pressure, and chemical degradation — far superior to traditional rubber hoses.

Hose Features:

• Reinforced multi-ply silicone construction

• Temperature tolerance from -65°F to 500°F

• Excellent pressure resistance for marine and turbocharged engines

• Available in all major sizes for 6-71 Turbo configurations

Complementing the hose selection, our hose clamps cover every diameter range — from small coolant lines to large radiator or intercooler hoses. Each clamp features corrosion-resistant stainless steel construction and smooth interior bands to prevent hose damage.

Common Clamp Ranges Include:

• 9/16” – 1-1/16”

• 1” – 1.5”

• 1-9/16” – 2-1/2”

• 2-7/8” – 3.5”

These clamps maintain consistent torque and pressure without cutting into silicone or rubber hose material — ensuring long-term reliability.

Additional Cooling Components

Drain Fittings & Cocks

Drain fittings (¼” and ⅜”) allow for convenient system draining during maintenance or coolant replacement. They are essential for winterization and long-term storage of marine engines.

Temperature Switch

The Detroit Diesel Temperature Switch (Closes at 205°F) automatically triggers alarms or shutdowns when the coolant temperature exceeds safe limits. This switch is compatible with Detroit Diesel, Cummins, and Caterpillar systems — perfect for integrated fleet operations.

Radiator Cleaner

For preventive maintenance, Diesel Pro Power offers a Radiator Cleaner (18E) formulated to dissolve scale, rust, and residue from coolant passages. It restores flow and heat exchange efficiency in older systems.

Cooling System Maintenance Tips for Detroit Diesel 6-71 Turbo

Maintaining proper coolant circulation is essential to protect the 6-71 Turbo’s aluminum and cast iron components from thermal fatigue. Follow these guidelines for best results:

1. Inspect the Water Pump Regularly: Look for leaks from the weep hole or seal housing. Any coolant seepage indicates the need for a new seal or a full pump rebuild.

2. Check Coolant Level and Quality: Use a 50/50 antifreeze mix to prevent corrosion and maintain freezing/boiling protection.

3. Flush the Cooling System Annually: Remove old coolant and residue to prevent blockages in the oil cooler and heat exchanger.

4. Replace Thermostats Periodically: Aging thermostats can stick, leading to overheating or poor cabin heater performance.

5. Use Silicone Hoses for Longevity: Silicone hoses resist cracking, swelling, and oil exposure much better than conventional rubber alternatives.

6. Torque Clamps Properly: Avoid overtightening, which can deform hose surfaces or cause premature failures.

7. Check Bypass Tubes: Ensure there are no obstructions; clogged bypass lines can cause temperature spikes before the thermostat opens.

Paint & Finishing Accessories

For a clean, professional finish, Diesel Pro Power supplies Detroit Green Engine Paint — the iconic color associated with Detroit Diesel engines. This high-temperature enamel is formulated for metal surfaces exposed to heat and vibration, helping protect against corrosion while preserving authenticity.

Why Buy Detroit Diesel 6-71 Turbo Cooling System Parts from Diesel Pro Power

Choosing the right supplier is as vital as choosing the right part. Diesel Pro Power is the global leader for Detroit Diesel 6-71 Turbo cooling system components because:

Proven Global Reputation – Over 40,000 satisfied customers across 180+ countries trust Diesel Pro Power for reliable parts and service.

Premium Aftermarket Quality – Every pump, seal, gasket, thermostat, and accessory meets or exceeds OEM specifications for durability and fit.

Comprehensive Catalog – Every product is organized by engine model and system, making part selection fast and accurate.

Fast Worldwide Shipping – From marinas to industrial sites, Diesel Pro Power delivers quickly to minimize downtime.

Expert Technical Support – Our specialists assist with pump rotation selection, repair kit compatibility, thermostat ratings, and complete cooling system troubleshooting.