The Detroit Diesel 471 engine, part of the renowned Series 71 family, has earned its place as a legendary workhorse across marine, industrial, and military applications. Known for its simplicity, durability, and unmistakable two-stroke roar, the 471 non-turbocharged 2-valve variant is an especially popular choice in commercial boats, generators, and vintage equipment due to its robust engineering and reliable operation. Unlike its turbocharged counterparts or newer emissions-focused models, the 471 non-turbo 2-valve engine is a naturally aspirated two-stroke diesel engine with two valves per cylinder, offering simplicity in maintenance and ease of overhaul. This design is favored by boat owners and diesel mechanics who prioritize uptime and straightforward diagnostics over complex electronics and turbo systems. At Diesel Pro Power, we specialize in premium aftermarket parts tailored to keep the 471 engine running smoothly, with faster shipping, industry-best warranties, and excellent product availability. Whether you're restoring a classic tugboat, maintaining a vintage generator, or running a fishing vessel in remote waters, our aftermarket parts give your 471 engine a second life. Series: 71 Series Model: 471 (4-cylinder) Displacement: 284 cubic inches (4.65L) Bore x Stroke: 4.25” x 5.00” Engine Type: 2-stroke diesel Valvetrain: 2 valves per cylinder (1 intake, 1 exhaust) Aspiration: Naturally aspirated (non-turbocharged) Cylinder Head Type: Individual heads per cylinder Firing Order: 1-3-4-2 Compression Ratio: Approximately 17:1 Fuel System: Mechanical unit injectors (pressure timed) Governed Speed Range: 1,200 – 2,100 RPM depending on application Oil Capacity (with filters): Approximately 7.5 gallons (28.4 liters) Coolant Capacity: Approximately 6.5 gallons (24.6 liters) Oil Pressure Range (Operating): 40 – 60 PSI at rated speed Thermostat Opening Temp: 170°F – 180°F Maximum Coolant Temp: 200°F Dry Weight (without accessories): ~1,650 lbs (748 kg) Length: ~52 in Width: ~28 in Height: ~38 in This engine was designed for versatility and rugged performance. It has powered an array of machines and vessels throughout the 20th century and continues to be a staple in legacy equipment thanks to strong aftermarket support. Tugboats & Push Boats: Compact yet powerful, ideal for harbor maneuvering and low-speed torque. Fishing Boats: Especially prevalent in shrimpers, crabbers, and lobster boats along the U.S. Gulf and Pacific coasts. Workboats & Utility Vessels: Used in dredging, transport, and harbor services. Military Craft: Found in patrol boats and landing craft, known for dependability under fire. Commercial Ferries: Reliable propulsion in smaller ferry fleets across rivers and lakes. Generators & Power Units: Frequently used in backup power and remote-location generators. Pumps: Applied in high-volume fluid transfer for agriculture, irrigation, and fire suppression. Construction Equipment: Historically used in cranes, rock crushers, and heavy earthmovers. Rail Maintenance Equipment: Powering ballast regulators and track tampers. U.S. Military Equipment: Frequently used in WWII-era landing craft and tanks. Foreign Military Units: Exported for use in combat and utility vehicles globally. Civil Defense and Emergency Power Units: Often installed in FEMA and Civil Defense emergency generators. The Detroit Diesel 471 was engineered in the era of mechanical resilience, before digital electronics and electronic fuel injection complicated diagnostics. As a result, a skilled mechanic with the right tools and parts can overhaul this engine without needing specialized diagnostic software. Each cylinder has its own head and liner, simplifying maintenance. If one cylinder has wear or a dropped valve, it can be isolated and replaced independently. The 471’s compact size and water-cooled configuration make it easy to install in small engine rooms and commercial marine hulls. Its two-stroke cycle delivers reliable torque for maneuvering and working under load. Marine Detroit Diesel 4-71 Component Maintenance Life Practical Guide To Servicing Your Detroit Diesel 71 Series Inline (271, 371, 471, & 671 ) – Part 1 Engine Components and Their Roles (Covering Detroit Diesel 271, 371, 471, 671 Engines) Key Maintenance Procedures (Covering Detroit Diesel 271, 371, 471, 671 Engines) Assembly and Disassembly Guidelines (Covering Detroit Diesel 271, 371, 471, 671 Engines) Safety Protocols for Technicians (Working On Detroit Diesel 271, 371, 471, 671 Engines) Torque Specifications And Wear Limits (Covering Detroit Diesel 271, 371, 471, 671 Engines) Disassembly Of Throttle Controls For Detroit Diesel 71 Series Inline Engine (271, 371, 471, 671) DISASSEMBLY OF AIR BOX COVERS FOR DETROIT DIESEL 71 SERIES INLINE ENGINES (271, 371, 471, 671) Disassembly Of The Blower For Detroit Diesel 71 Series Inline Engine (271, 371, 471, 671) Removing Air Box Drains For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671) REMOVING THE VALVE ROCKER COVER ON A DETROIT DIESEL 71 SERIES INLINE ENGINE (271, 371, 471, 671) Torque Specifications Of 71 Series Inline Engines (271, 371, 471, 671) Disassembly Of Components For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671) Key Components of the Oil Pump and Model-Specific Variations (271, 371, 471, 671) INSIGHTS FROM THE DETROIT DIESEL 71 SERIES INLINE ENGINE MANUAL VOLUME 2 (271, 371, 471, 671) LUBRICATION SYSTEM FOR DETROIT DIESEL 71 SERIES INLINE ENGINES (271, 371, 471, 671) Disassembly of the Oil Pump For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671) Reassembly of the Oil Pump For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671) Oil Filters For Detroit Diesel 71 Series Inline Engines (271,371, 471, 671) LUBRICATING OIL PRESSURE REGULATOR FOR DETROIT DIESEL 71 SERIES INLINE ENGINES (271, 371, 471, 671) Oil Cooler For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671) Oil Pan For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671) Ventilating System for Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671) Oil Pump Maintenance For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671) Radiator Cooling For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671) Cooling System and Heat Exchanger For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671) Cooling System Configurations For 71 Series Inline Engines (271, 371, 471, 671) Types of Coolant for Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671) Chemicals & Coolant For Your Detroit Diesel 71 Series Inline Engine (271, 371, 471, 671) Maintaining The Heat Exchanger Core For Detroit Diesel 71 Series Inline Engine (271, 371, 471, 671) Guidelines for Coolant For Detroit 71 Series Inline Engines (271, 371, 471, 671) Introduction to the Water Pump System for the 71 Series Inline Engine (271, 371, 471, 671) Disassembly of the Freshwater Pump For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671) Reassembly of the Freshwater Pump For Detroit Diesel 71 Series Inline (271, 371, 471, 671) Freshwater Pump Maintenance For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671) Raw Water Pump Maintenance (Marine Application) For 71 Series Inline Engines (271, 371, 471, 671) Disassembly of the Raw Water Pump For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671) Reassembly of the Raw Water Pump For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671) Water Pump For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671) Thermostat Operation For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671) SYSTEMATIC APPROACH TO TROUBLESHOOTING DETROIT DIESEL 71 SERIES INLINE ENGINES (271, 371, 471, 671) Cooling System Troubleshooting For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671) Troubleshooting Tips for Improved Efficiency In Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671) Detroit Diesel 271,371,471,671 Inline Engine Tune Up Guide Disassembly Turbocharger (If Equipped) For Detroit Diesel 71 Series Inline Engines (471, 671) Disassembly Of Turbochargers For Detroit Diesel 71 Series Inline Engines – (471, 671)
Parts for Detroit Diesel 471 Non-Turbo - (2 Valve Head Type)
-
Select Parts Category
Loading...
Detroit Diesel 471 Non-Turbo 2-Valve Engine Engine Specifications & Applications
Introduction to the Detroit Diesel 471 Non-Turbo 2-Valve Engine
Key Specifications of the Detroit Diesel 471 Non-Turbo 2-Valve Engine
Engine Design and Configuration
Oil & Cooling System Capacities
Dimensions and Weight
Common Applications of the 471 Non-Turbo Engine
Marine Applications
Industrial Applications
Military and Government Equipment
Why Diesel Mechanics Trust the 471 Non-Turbo in the Field
Engineered for the Long Haul
Modular Component Design
Marine Adaptability
Additional Resources
AIR SCAVENGING AND BLOWER SYSTEM FOR DETROIT DIESEL 71 SERIES INLINE ENGINES (271, 371, 471, 671)
Best Practices for Keeping Air Intake and Exhaust Systems Clean For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671)
Cleaning and Inspection Processes For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671)
Safe Cleaning Procedures Detroit Diesel 71 Series Inline Engine (271, 371, 471, 671)
Critical Inspection Points For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671)
Valve and Injector Maintenance For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671)
Checking Valve Clearance and Injector Timing For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671)
Tools and Equipment For Maintaining Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671)
Detailed Overhaul Process For Detroit Diesel 71 Series Inline Engine (271, 371, 471, 671)
Common Troubleshooting Tips For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671)
Disassembly Of Fuel Lines For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671)
Disassembly Of Exhaust Manifold For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671)
Disassembling The Air Cleaner & The Air Shutdown Housing For Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671)
Summary of Troubleshooting and Specifications In Detroit Diesel 71 Series Inline Engines (271, 371, 471, 671)
FAQ From Detroit Diesel 71 Series Inline Engine Service Manual (271, 371, 471, 671)