3-71 Detroit Diesel Parts and Information

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Parts for Detroit Diesel 3-71

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Parts for Detroit Diesel 3-71

The 371 Detroit Diesel is a relatively small but reliable engine. Finding parts can be difficult, but not with Diesel Pro. We have a huge selection of parts ready to be shipped virtually anywhere in the world. Our website is designed to offer multiple shipping options, including next-day air. We offer fast order processing, less than one business day, to get your parts to you faster than many other sources. We are fully equipped to ship internationally quickly and seamlessly as well, so if you have problems with a generator in the Yukon of Canada, or need to repair a boat in the Caribbean, we can get you what you need. Be sure to check out our cylinder kit, which is one of our best sellers for this engine, and will come with everything you will need for the overhaul, including rings, retainers and liners. Whatever you need, give us a call and we will be happy to get an order started for you. Try us today and you will see, Diesel Pro is a better way to buy parts online.

If you are unsure that this is your engine, locate the model and serial number stamped on the engine block. For this series, this number will start with a 3A, and be similar to 3A12345. Older models may have a marking that starts with 371, such as 371-12345 or a serial number that starts with a 3-, such as 3-12345.

This engine is also called the GM 371 in some uses.

General Specs, Information and Horsepower

Listed here are the 3-71 Detroit Diesel specs. Please note that torque is based on rated power at 85 degrees F, and horsepower is based on brake horsepower.

The Detroit Diesel 371 is a 3 cylinder engine with a total displacement of 213 cubic inches and has 4 main bearings.

Normal lubricating oil pressure is 30-60 PSI at 1200 RPM, 38-60 PSI at 1800 RPM and 40-60 PSI at 2000 RPM.

With N60 Injectors:

Horsepower (BHP): 66 at 1200 RPM, 84 at 1600 RPM, 97 at 2000 RPM.
Torque (LB FT): 287 at 1200 RPM, 277 at 1600 RPM, 252 at 2000 RPM.

With N70 Injectors:

Horsepower (BHP): 65 at 1200 RPM, 90 at 1600 RPM, 111 at 2000 RPM.
Torque (LB FT): 272 at 1200 RPM, 294 at 1600 RPM, 288 at 2000 RPM.

Other Popular Categories

If you need parts for any other motor, be sure to check out our other popular categories.

Detroit 671

Detroit 6V71

Engine Specifications & Applications of the Detroit Diesel 3-71 Naturally Aspirated Engine (2-Valve and 4-Valve Versions)

Overview: Detroit Diesel 3-71 Non-Turbo

The Detroit Diesel 3-71 is a three-cylinder, two-stroke diesel engine that belongs to the renowned 71 Series—named for its 71 cubic inches of displacement per cylinder. With a total displacement of 213 cubic inches (3.5 liters) and a naturally aspirated configuration using a Roots-style blower, the 3-71 delivers strong low-end torque and reliable performance in a compact, easy-to-service package.

The engine was produced in two primary configurations:

2-Valve Cylinder Head (Standard)
4-Valve Cylinder Head (High-Performance Variant)

Each version offers unique advantages, and Diesel Pro Power supplies aftermarket parts for both types, helping operators keep their 3-71 engines running across marine, industrial, and military applications.

Detroit Diesel 3-71 Engine Specifications

Specification	Value
Engine Configuration	Inline 3-cylinder, two-stroke diesel
Displacement	213 cu in (3.5 liters)
Bore x Stroke	4.25 in x 5.00 in
Aspiration	Naturally Aspirated (Blower Only)
Blower Type	Roots-style, gear-driven
Cooling System	Water-cooled
Oil Capacity	~8 quarts
Dry Weight	~1,100–1,200 lbs (varies by head type)
RPM Range	1,800–2,100 RPM (governed)