Generator Engines · 4BTA3.9

Cummins 4BTA3.9-G2 58KW 79HP Generator Engine

Name: Cummins 4BTA3.9-G2 58KW 79HP Generator Engine
Brand: Cummins
SKU: 4BTA3.9-G2
Availability: InStock

Cummins 4BTA3.9-G2 4-cylinder in-line diesel engine of 3.9L delivering 58 kW (79 HP) at 1500 rpm used for prime and standby generator sets.

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Cummins 4BTA3.9-G2 58KW 79HP Generator Engine

Cummins 4BTA3.9-G2 58KW 79HP Generator Engine shown from another angle

Cummins 4BTA3.9-G2 58KW 79HP Generator Engine complete engine assembly

Overview

What This Engine Is Built For

Cummins 4BTA3.9-G2: a 4-cylinder in-line generator drive diesel engine displacing 3.9L on a 102 * 120 mm bore and stroke, supplied complete by MEP Power. It is rated at 58 kW (79 HP) at 1500 rpm. The engine is turbocharged and water cooled, with a BYC A Pump/RSV Governor fuel system. It is built at the Dongfeng Cummins Plant 4BTA3.9-G2. Typical duty is prime and standby generator sets; dry weight with flywheel and alternator is 350 Kg and the overall envelope is 867mm*544mm*988mm.

Model4BTA3.9-G2 (58kw)

Rated power58 kW/79HP @ 1500 rpm

Displacement3.9L

AspirationTurbocharged

Net weight350 Kg

Key Benefits

Delivers 58 kW (79 HP) at 1500 rpm from 3.9L as a factory-rated assembly.
Turbocharged induction with water cooling keeps charge temperature under control in continuous duty.
Dry weight 350 Kg and envelope 867mm*544mm*988mm are published so the installation can be checked before ordering.
Starts without auxiliary aids down to -12℃.
Built on the 4BTA3.9 platform, a Cummins family with parts availability worldwide
Shipped from Shiyan, Hubei, China with export packing and full documentation

Application Scenarios

Prime mover for a new generator set build
Standby set engine replacement
Rental power fleet rebuild
Containerised power module

Who It Is For

Genset packagers matching an engine to an alternator
Rental power companies rebuilding sets between contracts
Industrial sites replacing the prime mover in an existing canopy
Telecom and data infrastructure contractors specifying standby power

Problems It Solves

An engine that does not hold speed under block load makes the whole set unusable.
Packagers lose weeks when the engine does not match the alternator and the base frame.
Standby sets sit idle for months and must still start and take load on demand.
Identifying the right 4BTA3.9-G2 variant from a serial number takes experience; MEP Power checks the configuration before quoting.

Technical data

Specification As Published

Values below are the published data for this unit. Where a figure is not listed it was not stated by the source data sheet; ask and we will confirm before you order.

Model	4BTA3.9-G2 (58kw)
Type	4 Cylinders in Line, 4 Stroke Diesel
Displacement	3.9L
Bore x Stroke	102 * 120
Net Weight	350 Kg
Overall Dimension	867mm544mm988mm
Manufacturing Plant	Dongfeng Cummins Plant 4BTA3.9-G2
Rated Power/Speed	58 kW/79HP @ 1500 rpm
Standby Power	63 kW/85HP @ 1500 rpm
Low Idle Speed	950-1050 rpm Fuel Consumption @ Running: ≤ 230g/Kw.h 4BTA3.9-G2
Aspiration	Turbocharged
Fuel System	BYC A Pump/RSV Governor
Governor Type	Electronic, Regulation 1%-5%
Electrical System (starter motor/alternator)	12V/24V
Lowest Starting Temp (without auxiliary system)	-12℃
Engine Cooling Fluid Volume	7.9 L
Cooling Method	Water Cooled
Rated Power	58 kW (79HP)
Rated Speed	1500 rpm
Cylinders	4 Cylinders in-line
Prime Power	58 kW (79HP)

Technical Features

Cylinders: 4 Cylinders in Line, 4 Stroke Diesel
Displacement: 3.9L
Bore and stroke: 102 * 120
Aspiration: Turbocharged
Fuel system: BYC A Pump/RSV Governor
Governor: Electronic, Regulation 1%-5%
Electrical system: 12V/24V
Coolant capacity: 7.9 L

Quality Control

Every engine is inspected by the MEP Power inspection team before it leaves the warehouse
Engine, configuration and serial numbers are recorded and photographed for the buyer
Genuine and OEM units are quoted separately so the buyer knows exactly what is supplied
Warranty on genuine and OEM new engines and generator sets is one year or 1000 hours, whichever comes first; parts and repair labour are covered for quality faults inside that period.

Use and Installation Guide

Quote the model 4BTA3.9-G2 when ordering so the correct variant is supplied.
Match the flywheel and SAE housing to the alternator before assembly
Set the governor to the frequency required, 50 Hz or 60 Hz
Run a load bank test before the set goes into service
Keep the warranty terms in mind: one year or 1000 hours, whichever comes first.

Customisation Options

OEM and ODM builds, including your logo and company name on the unit
Cummins engine customisation and modification to your requirement
Mining and special explosion-proof builds
Genuine or OEM parts specified on the quotation

How It Compares

Compared with	What to consider
A rebuilt or used engine of the same rating	A rebuilt unit may show the same 58 kW (79 HP) on paper, but its running history is unknown and the warranty rarely covers the whole engine.
A larger engine in the same 4BTA3.9 range	Moving up a frame size adds weight, envelope and fuel burn; specify the next size up only if the duty cycle really needs the headroom.
A non-Cummins engine of similar output	Parts and service for Cummins families are available in most markets, which matters more over ten years than the purchase price on day one.

Questions

4BTA3.9-G2 Questions

Is this 4BTA3.9-G2 a genuine Cummins engine

MEP Power supplies 100% genuine Cummins engines, generator sets and engine parts, plus OEM units and customised builds. Tell us which you need and the quotation will state clearly whether the unit offered is genuine, OEM or a customised build.

What power does the 4BTA3.9-G2 produce

The rating supplied is 58 kW (79 HP) at 1500 rpm.

What warranty comes with the engine

New genuine and OEM engines and generator sets carry one year or 1000 hours, whichever comes first. Inside that period MEP Power supplies replacement parts free of charge and covers the cost of the engine repair for quality faults.

How do I confirm this is the right variant for my machine

Send the engine serial number or the nameplate photograph of the unit being replaced. MEP Power checks it against the 4BTA3.9-G2 configuration before quoting.

How is the engine shipped and what payment terms apply

Shipment is by sea, air or express depending on size and urgency, arranged by MEP Power or by your own forwarder. Payment terms are Alipay, WeChat, T/T or L/C.