4BT3.9-G36
- 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
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 |
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