Establishments primarily engaged in manufacturing diesel, semi-diesel, or other internal combustion engines, not elsewhere classified, for stationary, marine, traction, and other uses. Establishments primarily engaged in manufacturing aircraft engines are classified in Industry 3724, and those manufacturing automotive engines, except diesel, are classified in Industry 3714.

• Diesel and semi-diesel engines for stationary, marine, traction, etc
• Diesel engine parts
• Engines and engine parts internal combustion military tank
• Engines, internal combustion except aircraft and non-diesel
• Engines diesel and semi-diesel and dual fuel-except aircraft
• Gas and diesel engine rebuilding, on a factory basis
• Governors, diesel engine
• Internal combustion engines, except aircraft and non-diesel automotive
• Marine engines: diesel, semi-diesel, and other internal combustion
• Outboard motors, except electric
• Semi-diesel Engines for stationary, marine, traction, or other uses
• Tank engines and engine parts, internal combustion: military