4BT3.9-G36

China 4BT3.9-G36 offered by :Xiangyang Likang Power Technology Co., Ltd., They are used in Construction Machinery，Marine Propulsion，Stationary Power Generation，Combined Heat & Power (CHP)，Backup Emergency Power；

Rated Power: 20

Engine Type: 4-Cylinder In-Line， Turbocharged

Bore × Stroke: 102 × 120

Displacement: 3.9

Cooling System: Air-to-Air Intercooled

Fuel Type: CNG

Oil Requirement: CH-4 or above grade gas engine-specific oil

Reliability Test: 2000-hour bench test for key components

Warranty: 12 months or 1，000 operating hours (whichever occurs first)

Dimensions (L×W×H): Approx. 1850*750*1100

Weight: Approx. 935

Application: Construction Machinery， Marine Auxiliary

Description

The compact, lightweight, and cost-effective Type B engine delivers cleaner and quieter performance, with a rated power output of 20 kW. Under strict adherence to maintenance guidelines, it achieves a mean time between failures (MTBF) of 1,500 hours and a mean time between overhauls (TBO) of 6,000 hours or more. Even under extreme duty cycle testing, this model maintains strong performance. Its low noise levels, reduced weight, and high power-to-weight ratio are all attributable to its world-class reliability.

Basic Specifications

Compression Ratio: 11.5:1
Bore: 102 mm
Stroke: 120 mm
Speed Regulation: ≤3%
Aspiration: Turbocharged
Displacement: 3.9 L
Number of Cylinders: 4
Test Condition: Engine equipped with water pump and oil pump; without air compressor, generator, fan, optional parts and driving parts; intake resistance 3.7 kPa, exhaust resistance 10 kPa
Flywheel Interface: 3#/11.5
Dimensions (Standard Configuration, mm): 1080×625×1085
Maximum Continuous Operating Altitude: 2200 m
Performance Test Conditions: Atmospheric pressure 100 kPa, intake air temperature 25 °C, tested per GB/T18297

Engine Power Data

Engine Speed (RPM)	Engine Power		Generator Set Continuous Power
	kW	HP	HP
1500	36	48	40
1800	40	54	48

Performance Data at 1500 RPM

Output Power			Gas Consumption
%	kW	HP	m³/kW·h	m³/h
Standby Power
100	36	48	0.33	12
Prime Power
100	30	40	0.33	10
75	23	30	0.32	8
50	15	20	0.34	5
25	8	11	0.33	3

Performance Data at 1800 RPM

Output Power			Gas Consumption
%	kW	HP	m³/kW·h	m³/h
Standby Power
100	40	54	0.33	13
Prime Power
100	40	54	0.32	13
75	30	40	0.33	10
50	20	27	0.31	7
25	10	13	0.34	3

Typical Engine Data

Dry Weight: 338 kg
Transient Moment of Inertia (Without Flywheel): 0.25 kg·m²
Distance from Center of Gravity to Front Face of Cylinder Block: 391 mm
Distance from Center of Gravity to Crankshaft Centerline (Above Crankshaft): 140 mm
Firing Order: 1-3-4-2

Engine Mounting

Maximum Allowable Static Bending Moment at Rear Face of Cylinder Block: 1356 N·m

Exhaust System

Maximum Exhaust Back Pressure: 10 kPa

Charge Air Cooling System

Maximum Allowable Temperature Difference Between Intake Manifold and Inlet Air: 25 °C
Maximum Allowable Pressure Drop Across Intercooler: 13 kPa
Maximum Allowable Intake Manifold Temperature (Ambient 25 °C): 50 °C
Maximum Allowable Intake Manifold Temperature: 58 °C

Intake System

Maximum Allowable Intake Resistance (Heavy‑Duty Air Cleaner)
- Clean Filter Element: 3.7 kPa
- Dirty Filter Element: 6 kPa
Minimum Dirt Holding Capacity of Heavy‑Duty Air Cleaner: 53 g/litre/sec
Maximum Temperature Rise from Ambient Air to Turbocharger Inlet: 17 °C
Recommended Minimum Inner Diameter of Intake Pipe: 76 mm

Lubrication System

Normal Operating Oil Pressure Range
- Low Idle: 207 kPa
- Rated Speed: 345 kPa
Maximum Oil Sump Temperature: 121 °C
Oil Capacity (Offset Oil Sump): Max. 14.2 L – Min. 12.3 L
Minimum Lubrication System Capacity (Oil Sump + Oil Filter): 16.4 L
Inclination Angle with Offset Oil Sump
- Front Up: 40°
- Front Down: 40°
- Side to Side: 40°

Cooling System

Coolant Capacity (Engine Only): 10 L
Maximum External Cooling Circuit Resistance
- 1800 RPM: 35 kPa
- 1500 RPM: 28 kPa
Maximum Static Coolant Height Above Crankshaft Centerline: 1.4 m
Standard Thermostat Opening Temperature (Range): 82–95 °C
Minimum Pressure Cap Pressure: 69 kPa
Maximum Coolant Temperature at Standby / Rated Power: 104 °C / 100 °C

Electrical System

Item	Unit	Specification
Starter	V	12V / 24V
Battery Charging System (Negative Ground)	A	63 / 40
Maximum Starting Circuit Resistance	Ω	0.00075 / 0.002
Minimum Battery Capacity (Cold Soak at −12 °C or Above)	CCA	800 / 400

Emission Data (Tested per GB 20891‑2007)

At Rated Speed 1500 RPM

Pollutant	Unit	Value
NOx	g/kW·h	9.2
HC	g/kW·h	1.3
CO	g/kW·h	5.0
Particulate Matter	g/kW·h	0.70

At Rated Speed 1800 RPM

Pollutant	Unit	Value
NOx	g/kW·h	9.2
HC	g/kW·h	1.3
CO	g/kW·h	5.0
Particulate Matter	g/kW·h	0.54

Additional Operating Parameters

Item	Unit	Standby Power		Rated Power
		1800 RPM	1500 RPM	1800 RPM	1500 RPM
Low Idle Speed	rpm	750–850	750–850	750–850	750–850
Output Power	kW	40	36	36	30
Piston Speed	m/s	7.2	6.0	7.2	6.0
Friction Loss Power	kW	9.3	8.7	8.5	6.4
Engine Coolant Flow	L/sec	2.4	2.0	2.4	2.0
Intake Air Flow	L/sec	43.0	32.9	43.0	32.8
Exhaust Gas Flow	L/sec	81.9	71.0	78.5	67.5
Exhaust Temperature	°C	570	540	540	500
Air‑Fuel Ratio	air:fuel	12:1	12:1	12:1	12:1
Ambient Heat Loss (Dry Manifold)	kW	20	18	18	16
Coolant Heat Loss (Dry Manifold)	kW	12	9	9	5
Exhaust Heat Loss	kW	29	24	25	20

Company Overview

Since its establishment in 2012, Xiangyang Likang Power Technology Co., Ltd. has been committed to becoming a leader in the field of power technology. As a source manufacturer in China, the company specializes in the R&D, manufacturing, and sales of gas engines. It also serves as a core supplier of full-range genuine parts for Cummins diesel and gas generator sets. The company’s core business deeply focuses on the independent R&D and lean manufacturing of gas engine series such as 4B, 6B, 6C, 6L, and 15N. The products are widely applied in engineering machinery and marine propulsion due to their outstanding performance. In the parts business, as an authorized core distributor of Dongfeng Cummins and Chongqing Cummins in China, the company provides comprehensive and efficient genuine spare parts support, offering one-stop supply chain solutions for customers.

Located in the Xiangyang High-tech Industrial Development Zone, the company operates a modern factory spanning over 6,000 square meters and employs more than 50 professionals. With a core team boasting over two decades of industry experience, the company leverages its strong technical expertise and extensive market knowledge to continuously create value for customers.

Looking ahead, Likang Power will continue to drive innovation, build on its service foundation, and collaborate with global customers to achieve mutual success, injecting a powerful and enduring momentum into the industry's development.

Certifications

Faq

How do you ensure that the Cummins parts you supply are genuine?

We provide original factory documentation for all parts and support authenticity verification through official Cummins channels. Additionally, we are an authorized Cummins distributor or OEM partner, and the relevant certifications can be queried on our website.

Our existing equipment is an older model. Can you guarantee that the Cummins parts provided will be a perfect match?

You will need to provide the engine serial number or the old part number. Our technical team will conduct a cross-check to ensure that the parts you receive are the correct ones. 3.Can the packaging of the goods ensure they remain intact after long-distance sea freight? Absolutely. We use waterproof film, cartons, and reinforced wooden crates for multi-layer packaging, effectively protecting against moisture and impact. We will send you photos before shipment.

Can the packaging of the goods ensure they remain intact after long-distance sea freight?

Absolutely. We use waterproof film, cartons, and reinforced wooden crates for multi-layer packaging, effectively protecting against moisture and impact. We will send you photos before shipment.

If the generator set or parts have quality issues during the warranty period, what should we do?

In case of any issues, please contact us immediately via email or WhatsApp, providing videos and photos of the malfunction. Our engineers will conduct remote diagnostics and provide solutions.

There is no official Cummins after-sales service in our local area. Can you provide remote technical guidance?

Absolutely. We offer 24/7 online technical support, guiding your technicians through installation, debugging, and troubleshooting via video or phone.

Can you consistently supply specific models of Cummins parts over the long term? We prefer not to frequently change suppliers.

This is exactly our strength. We have established a strong supply chain partnership with Cummins, maintaining stable inventory and rapid replenishment channels. Our goal is to become your reliable long-term partner, ensuring the continuous operation of your equipment.

Can final inspection be conducted before shipment? Can we send someone to China for inspection?

We warmly welcome it! We encourage clients to inspect the goods before shipment. You can send your representative or authorize a third-party inspection agency (such as SGS). We will fully cooperate to ensure the products meet your expectations before arranging shipment.

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