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4B-3.9
Cummins
The Cummins 4B-3.9 is a highly versatile and dependable 3.9-liter, 4-cylinder diesel engine, celebrated as a cornerstone of the legendary Cummins B-Series. Renowned for its mechanical simplicity, robust construction, and fuel efficiency, this engine delivers a power range of 75 to 110 HP (56-82 kW) and is engineered to provide reliable performance across a diverse spectrum of industrial, construction, and power generation applications.
This engine platform is designed for flexibility and is commonly specified for:
Power Generation: Serves as a prime mover for commercial and industrial diesel generator sets, with prime power ratings typically from 31 to 38 kW.
Construction Machinery: Powers a wide array of equipment including skid-steer loaders, excavators, compact rollers, trenchers, and telehandlers.
Industrial & Material Handling: Found in air compressors, forklifts, scissor lifts, and conveyor systems.
Other Mobile Applications: Also used in step vans, agricultural machinery (like swathers), and various custom vehicle conversions.
Legendary B-Series Durability: Built with heavy-duty components including a forged steel crankshaft and camshaft, and a parent-bore cylinder block designed to handle high combustion pressures for exceptional longevity.
Integrated Engine Design: Certain advanced variants (e.g., 4BTA3.9) feature an integrated cylinder block and head design. This innovative approach uses approximately 40% fewer parts than comparable engines, dramatically reducing potential failure points and virtually eliminating water and oil leaks.
Efficient Combustion & Low Oil Consumption: The cylinder bores employ a platform mesh honing design, and the engines use advanced piston ring components. This engineering optimizes oil retention and significantly reduces oil loss over the engine's life.
Mechanical Simplicity & Reliability: Many models utilize a mechanical fuel injection system (e.g., rotary or inline pump). This design is prized for its ease of maintenance, serviceability without complex electronic diagnostics, and reliable operation in demanding or remote environments.
The Cummins 4B-3.9 is a highly versatile and dependable 3.9-liter, 4-cylinder diesel engine, celebrated as a cornerstone of the legendary Cummins B-Series. Renowned for its mechanical simplicity, robust construction, and fuel efficiency, this engine delivers a power range of 75 to 110 HP (56-82 kW) and is engineered to provide reliable performance across a diverse spectrum of industrial, construction, and power generation applications.
This engine platform is designed for flexibility and is commonly specified for:
Power Generation: Serves as a prime mover for commercial and industrial diesel generator sets, with prime power ratings typically from 31 to 38 kW.
Construction Machinery: Powers a wide array of equipment including skid-steer loaders, excavators, compact rollers, trenchers, and telehandlers.
Industrial & Material Handling: Found in air compressors, forklifts, scissor lifts, and conveyor systems.
Other Mobile Applications: Also used in step vans, agricultural machinery (like swathers), and various custom vehicle conversions.
Legendary B-Series Durability: Built with heavy-duty components including a forged steel crankshaft and camshaft, and a parent-bore cylinder block designed to handle high combustion pressures for exceptional longevity.
Integrated Engine Design: Certain advanced variants (e.g., 4BTA3.9) feature an integrated cylinder block and head design. This innovative approach uses approximately 40% fewer parts than comparable engines, dramatically reducing potential failure points and virtually eliminating water and oil leaks.
Efficient Combustion & Low Oil Consumption: The cylinder bores employ a platform mesh honing design, and the engines use advanced piston ring components. This engineering optimizes oil retention and significantly reduces oil loss over the engine's life.
Mechanical Simplicity & Reliability: Many models utilize a mechanical fuel injection system (e.g., rotary or inline pump). This design is prized for its ease of maintenance, serviceability without complex electronic diagnostics, and reliable operation in demanding or remote environments.