Parts for Detroit Diesel 471 Non-Turbo - (2 Valve Head Type)

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Detroit Diesel 471 Non-Turbo 2-Valve Engine Engine Specifications & Applications

Introduction to the Detroit Diesel 471 Non-Turbo 2-Valve Engine

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.

Key Specifications of the Detroit Diesel 471 Non-Turbo 2-Valve Engine

Engine Design and Configuration

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 & Cooling System Capacities

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

Dimensions and Weight

Dry Weight (without accessories): ~1,650 lbs (748 kg)
Length: ~52 in
Width: ~28 in
Height: ~38 in

Common Applications of the 471 Non-Turbo Engine

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.

Marine Applications

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.

Industrial Applications

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.

Military and Government Equipment

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.

Why Diesel Mechanics Trust the 471 Non-Turbo in the Field

Engineered for the Long Haul

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.

Modular Component Design

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.

Marine Adaptability

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.