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DCEC QSB3.9-C125-30 Industrial engine is a 4-cylinders in line, 3.9 liter four-strokes engine with 102mm bore and 120mm stroke. Equipped with Electrically Control High-pressure Common Rail, engine comes with turbocharger and Air- Air Intercooler. The prime power at 2200RPM of DCEC QSB3.9-C125-30 Industrial engine is 93 kW.

As part of EMAC, ConeMac provides industrial power pack solution that integrated with air intake, air exhaust, cooling system, control system, transmission and hydraulic accessories, We also supplying special products such as explosion proof engine, generator and water pump set, as well as ultra-low temperature condition engine power pack. We provide full life cycle services for all customers, from design to power system supply, from installation to commissioning, from after-sales service training to spare parts supply, from trouble shooting to overhaul technical support.


Advantages of QSB3.9 Industrial Engine

1. The cylinder bore adopts a platform mesh honing design, and the perfect geometric structure effectively prevents oil leakage, and adopts advanced technology such as new piston ring components and gasket crimping molding to reduce oil loss.

2. Adopt Holset supercharger with integral wastegate valve, low speed response and strong power.

3. Using forged steel camshaft and crankshaft, high-strength cylinder block design, multiple parts are cast on the cylinder block, with high rigidity, high pressure resistance, good reliability and longer service life.

4. The electronic control system can intelligently switch the working mode according to the environment and operating conditions, and has the functions of self-diagnosis, alarm and limp home, which is cost-effective.

Introduction of QSB3.9-C125-30

Engine Model:QSB3.9-C125-30
Engine Type:4 Cylinders, in Line
Displacement:3.9 L
Rated Speed:2200 rpm
Aspiration Method:T & C
Emission Standard:CHINA III
Packing Size(L*W*H):778*753*882mm
Wet Weight:N/A
Lead Time:15-30 Working Days
Payment Terms:T/T ,L/C

Engine Model

Engine Speed

Output Power


Fuel System

        QSB3.9-C110-302200RPM81KW350N.m            Weifu PW Pump/RSV Mechanical Governor
        QSB3.9-C125-302200RPM92KW400N.m            Weifu PW Pump/RSV Mechanical Governor
        QSB3.9-C130-312500RPM96KW367N.m            Weifu PW Pump/RSV Mechanical Governor


General Infomation of DCEC QSB3.9-C125-30 Industrial Engine

Engine ModelQSB3.9-C125-30Emission StandardCHINA III
AspirationTurbocharged&Air-Air IntercoolerDisplacement3.9L
No. of Cylinders4CPL Code Revision4854
Packing Size(L*W*H)778*753*882mm

Installation Data of DCEC QSB3.9-C125-30 Industrial Engine

Minimum idle speed800±50  r/min
Maximum no-load speed2386±20  r/min
Maximum overspeed performance (not exceeding 15 seconds)3300  r/min
0% throttle loading capability320N.m
Maximum altitude allowed for continuous operation4500m
Cold starting capacity
Minimum cold starting temperature without auxiliary starting device:﹣12°C
Minimum cold starting temperature for auxiliary starting device:﹣35°C


Engine Performance Data Rated Power of DCEC QSB3.9-C125-30 Industrial Engine

Rated PowerTorque PeakLow SpeedRated PowerTorque PeakLow Speed
Engine Speed2200min1350min800minHeat Loss to coolant41.2KW28KW15.6KW
Gross Power Output92KW68KW27KWHeat Rejection to Coolant197L/min105L/min63L/min
Torque400N.m480N.m320N.mHeat Loss to Intercooler15KW9.5KW1.2KW
The Air Flow132L/s70L/s23L/sTurbo Comp. Outlet Pressure170kPa113kPa18.2kPa
Charge Air Flow10.2KG5.4KG1.78KGTurbo Comp. Outlet Temp.148℃127℃60℃
Exhaust Gas Flow10.55KG5.64KG1.89KGThe Fuel Flow21.2KG14.4KG6.4KG
Exhaust Gas Temp.587℃630℃544℃


Scopes of Supply of DCEC QSB3.9-C125-30 Industrial Drive Engine

Cooling System1. Water pumpExhuast System1. Exhuast manifold
2. Engine Fan2. Turbocharger
3. Standard radiator3. Exhuast elbow
Starting System1. Starter motorFuel System1. Common rail fuel system
2. Starter rely2. Fuel Filter
Lubricating System1. Oil pumpPower Output System1. Flywheel
2. Oil filter2. Standard flywheel housing
Air Intake System1. Air intake manifoldCharging System1. Charging alternator
Engine Mounting System1. Engine Mouting BracketEngine Auiliary Accessories1. Air compressor
Control System1. ECU & sensors 


Optional Accessories of DCEC QSB3.9-C125-30 Industrial Drive Engine

Air Intake System1. Air Intake pre-heaterExhuast System1. Muffler & bellows
2. Air intake shut-off valve2. Flame trap
3. Air filter3. Spark arrestor type Muffler & bellows
4. Air intake pre-filter4. DPF system
5. Air filter alarm system5. N/A
Engine Auiliary Accessories1. Hydraulic oil pumpControl System1. Can add engine monitoring system, contro system with wiring harness.
2. Air conditioner compressor2. Can add self-protection system that integrated with alarm system.
Starting System1. Manual Magnetic DC ContactorCooling System1. Silent Type Radiator
2. Dual ears flywheel housing2. Plateau Radiator
3. Spring Starter Motor3. Salt-Spray Resistant Radiator
4. Air Starter Motor4. Coolant pre-heater
5. Hydraulic Starter Motor5. Jacket water heater
6. Remote starting function6. N/A
7. Lock protection function of starter motor7. N/A
8. Manual Magnetic DC Contactor
Fuel System1. Coarse FilterLubricating System1. Oil pre-heater.
Power Output System1. ClutchEngine Mounting System1. Shock absorber pad


Modifiable components of DCEC QSB3.9-C125-30 Industrial Drive Engine

Exhuast System1. Can modify installation position and direction of turbochargerCharging System1. 12V charging alternator for 12v electric system
1. Can modify installation position and direction of turbocharger2. Explosion-proof charging alternator
3. Water-cooled turbocharger3. Upgrading to specified brand and speicifications of charging alternator
Power Output System1. Can modify size of flywheel housing and flywheel.Lubricating System1. Oil Pan position
2. Dual-ear flywheel housing (For twin-starter system)2. Number of dipstick
3. Some of models can modify flywheel housing into PTO integrated type.3. Position of dipstick can choose from 6 positions
4. Engine have connecting port of PTOs, that able to provide power output4. Can modify oil filter to be remote installation
Cooling System1. Can modify engine fan into blower fan or suction fanEngine Auiliary Accessories1. All of auxiliary system can choose specified brands and specifications.
2. Can modify central position of engine cooling fan2. Additional auxiliary systems can be added for special applications.
3. Can choose type of engine fan from mechanical type or electric type3. N/A
Fuel System1. Upgrade to fuel fitler that integrated with fuel transfer pump and fuel pre-hearterEngine Mounting System1. Can modify engine mouting bracket.
Control System1. ECU can setting to different control mode, including CAN communication, analogue control, ISC1,ISC2,ISC3 speed conrol mode etc.


Contact EMAC Now!

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Sales Team

Generator Engine - Mr. Haden Wu

Marine Engine - Mrs. Hailey Tang

Automotive Engine - Mr. Vin Hu

Industrial Engine - Miss. Bella Huang

Pump Engine - Miss. Zora Zhou

Sales Director - Mr. Jasper Lee      

Service Team

Technical Service - Mr. Vin Hu

Customer Service - Mrs. Wendy Fu

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