Cummins 4BT3.9 Engine

Cummins 4BT3.9 Engine

Cummins 4BT3.9 Engine is a small horsepower engine which the power ranges from 80HP to 140HP. In mini equipment industry, Cummins 4BT3.9 Engines are used in Construction Machinery, Automotive Equipment, Generator Power Unit Marine Industry.  Cummins 4B3.9  engine is designed without cylinder liner, intake/exhaust valve insert, valve guide, cam shaft bushing, so Cummins 4B3.9 engine has less parts when comparing with the other brand engines.  In order to meet different market / equipment needs, Cummins developed different engine models. While according to the type of aspiration,  these engines are separated as followings:

  • Cummins 4B3.9 (Nature Aspiration)
  • Cummins 4BT3.9 (Turbocharged)
  • Cummins 4BTA3.9 (Turbocharged, Charged Air Cooled)
  • Cummins 4BTAA3.9 (Turbocharged, Charged Air Cooled)

Combine with the technology from Cummins factory, we provide a few solutions for your machinery. Not only Cummins 4BT3.9 engine assy but also 4BT3.9 long block engine will be your smart choice. So that you will get your equipment into work in a very short breakdown time.

New Cummins 4BT3.9 Engine Assy

CO-MACH offer the New Cummins 4BT3.9 Engines and our new engines will be built with the following parts:

  • New Cylinder Head Assy with Valves mounted
  • New Cylinder Block
  • New Crankshaft
  • New Camshaft

  • New Pistons, New Piston Pins, New Piston Ring Sets
  • New Connecting Rods, Bearings
  • New Fuel Injectors
  • New Fuel Injection Pump
  • New Turbocharger
  • New Rocker Assemblies
  • New Lubricating Oil Pump and Water Pump
  • New L.O Cooler
  • New Fuel Filters, Water Filters, L.O Filters
  • New Intake and Exhaust Manifolds
  • New Gears, New Gear Housings
  • New Starting Motor, New Alternator
  • New Flywheel, New Flywheel Housing
  • New Oil Pan
  • New Brackets, New Pulleys

Cummins 4BT3.9 Long Block Engines

CO-MACH manufacture Cummins 4BT3.9 Long Block Engine which Contains the following parts:

  • New Cylinder Head Assy Load with Valves
  • New Cylinder Block
  • New Crankshaft
  • New Camshaft
  • New Pistons, New Piston Pins, New Piston Ring Sets,
  • New Connecting Rod
  • New Bearings
  • New Lubricating Oil Pump and Water Pump
  • New L.O Cooler, New Oil Pan
  • New Rocker levers etc.

Long Blocks do not apply the outer fittings. In this case, CO-MACH long blocks don’t include the followings: Fuel pumps, Turbochargers, Turbo Drains, Fuel Lines, Injectors, Lift pumps, Air Compressors, Starters, Alternators, Flywheels, Flywheel Housings, Filters etc.

Cummins 4BT3.9 for Automobile

In automotive industry, Cummins 4BT3.9 engines are popular for Passenger Bus, Coach, School Bus, RV (Recreational Vehicle), Shuttle Bus Airport Airfield Bus, Airport Luggage Cart, People Mover etc. The Cummins 4BT3.9 engines are suit for Chinese Vehicles like YUTONG, KINGLONG, DONGFENG, JAC, HIGER … In general, Cummins 4BT3.9 automotive engine models are as below:

Engine Model Emission Standard Rated Power/Speed
Peak Torque
Euro II 92@2800 410@1500 Turbocharged,  Aftercooled
Euro II 103@2700 502@1500 Turbocharged, Aftercooled

Cummins 4BT3.9 Engines for Industrial Machinery:

In industrial market, Cummins 4BT3.9 Engines are applied to the small horsepower equipment like: Excavator, Loader, Bulldozer, Skid Steer, Roller, Tractor, Cranes, Forklift, Boom lift, Scissor Lift, Street Sweeper, Compressor … In China, the 4BT3.9-C engines are supplied to DOOSAN Shanghai, LIUGONG, LIU-TECH Air Compressor, ZHENGTAI, SANY, DYNAPACXGMA … Cummins 4BT3.9 Industrial engines are shown as below:

Engine Model Emission Standard Rated Power/Speed
Peak Torque
4BTA3.9-C80-II Euro II 60@2200 350@1500 Turbocharged, Aftercooled
4BTA3.9-C100-II Euro II 74@2200 380@1500 Turbocharged, Aftercooled
4BTA3.9-C110-II Euro II 82@2200 460@1400 Turbocharged, Aftercooled
4BTA3.9-C125-II Euro II 93@2300 475@1500 Turbocharged, Aftercooled
4BTA3.9-C130-II Euro II 97@2500 475@1500 Turbocharged, Aftercooled

Cummins 4BT3.9 Engines for Fire Emergency Pump Driven Engine

In emergency situation, the Fire Emergency pump should be given a reliable and durable power, So that the emergency situation can get efficiently controlled. Cummins 4BT3.9 Engines act as an important part of power source from fire emergency equipment. Generally, the Cummins 4BT3.9 Engine models for Fire Emergency pumps are shown as below:

Engine Model Rated Power/Speed
Fuel Pump Aspiration
4BTA3.9-P80 58@1500 Mechanical Pump Turbocharged, Aftercooled
4BTA3.9-P90 67@1800 Mechanical Pump Turbocharged, Aftercooled
4BTA3.9-P100 70@1500 Mechanical Pump Turbocharged, Aftercooled
4BTA3.9-P110 80@1800 Mechanical Pump Turbocharged, Aftercooled

Cummins 4BT3.9 Engines for Marine Engine

Currently, in order to supply the power to the marine vessels, diesel engine is the first choice of the main engine, generator engine and emergency generator engine in marine industry.  The marine Tug boat as well as supply boat, Bunkering vessels, Ferries, Fishing boat  choose Cummins 4BT3.9 Engines as their power supply driven engine. Generally, Cummins 4BT3.9 Marine engines models are as followings:

Engine Model Rated Power/Speed
Standby Power/Speed
4BT3.9-GM47 47@1500 52@1500 Turbocharged, Aftercooled
4BT3.9-GM55 55@1500 61@1500 Turbocharged, Aftercooled
4BT3.9-GM65 65@1800 72@1800 Turbocharged, Aftercooled

Cummins 4B3.9 Engines for Generator Set

In fact, Cummins engines are known as their reliability and durability. Cummins 4BT3.9 engines make your continuous power unit or a standby power unit working smoothly. Generally, Cummins 4BT3.9 engines models for generator sets are as followings:

Engine Model Rated Power/Speed
Standby Power/Speed
Governor Type
4B3.9-G1 24@1500 N/A Mechanical Governor
4B3.9-G1 27@1500 N/A Mechanical Governor
4B3.9-G2 24@1500 30@1800 Electronic Governor
4B3.9-G2 27@1500 33@1800 Electronic Governor
4BT3.9-G1 36@1500 N/A Mechanical Governor
4BT3.9-G1 40@1500 N/A Mechanical Governor
4BT3.9-G1 86@1500 N/A Mechanical Governor
4BT3.9-G1 92@1500 N/A Mechanical Governor

The Engine 4BT3.9-C105 is for small excavator


Fuel Pump:

Fuel Injector:


Water Pump:

L.O Pump:


  • With advanced design and sophisticated manufacturing, Cummins 4BT3.9 engine is suitable for all kinds of severe, high strength, heavy duty working conditions.
  • Cummins adopts the integrated design of the cylinder block and cylinder head to prevent the engine from cooling water leaking and oil leakage. The parts quantity is about 40% less than other similar engines, so that the failure rate is greatly reduced.
  • The perfect geometric structure prevents oil leakage and uses advanced technology such as new piston ring assembly and gasket crimping to reduce lube oil loss.
  • The Engine is designed with integral wastegate Holset supercharger for low speed response and high horsepower.
  • Complete Rebuildability: Cylinder block has multiple rebore capability and there is only need to insert the salvage sleeve (cylinder liner) or oversize piston for the dry type cylinder block.
  • Cast Iron Skirted Block: With five main bearings for maximum strength and rigidity, low weight and optimum crankshaft support.
  • Direct Injection Fuel System: For thorough mixing of air and fuel to ensure low fuel consumption; the fuel injection pump features advance mechanism for reliable cold starting.
  • Compact Size: For ease of installation and ready access for routine maintenance.
  • Emissions Certification: EPA/CARB: Complies with Mobile Off-Highway standard and Tiers 1 / Tier 2.
  • Optional Equipment: Please contact your local Cummins representative for additional information regarding engine options.

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