Parts for Detroit Diesel 371 Non-Turbo - (4 Valve Head Type)

-
Select Parts Category

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)