SDEC 4Z2.3-G21 Diesel Engine (Dual Frequency) is the SDEC 4Z2.3-G21 engine, built for continuous duty in generator sets and industrial drives.
The engine is supplied as a complete unit for coupling to an alternator, pump or machine: block, head, injection system, water pump and filters already fitted. The 4Z2.3-G21 designation identifies displacement and aspiration layout, so spare parts are ordered by that code rather than by power rating.
Data and compatibility
- Brand
- SDEC
- Model
- 4Z2.3-G21
- Frequency
- 50 / 60 Hz (dual frequency)
- Configuration
- 4 cylinders in line
- Aspiration
- Aspiración natural
- Origin
- China
Technical Specifications
Typical Generator Capacity (50/60 Hz)
| Model | 50 Hz Prime / Standby (kVA) | 60 Hz Prime / Standby (kVA) | Engine Output 50/60 Hz (kW) |
|---|
| 4Z2.3-G21 | 15 / 17 | 20 / 23 | 16 / 18 | 21 / 23 |
Typical Generator Capacity (50/60 Hz)
| Model | 50 Hz Prime / Standby (kVA) | 60 Hz Prime / Standby (kVA) | Engine Output 50/60 Hz (kW) |
|---|
| SC4H95D2 | 63 / 70 | / / / | 62 / 68 | / / / |
| Parameter | 4Z3.2 (G41-G42) | 4Z2.9 (G41-G430) |
|---|
| Aspiration | Natural aspiration | Natural aspiration |
| No. of Cylinders×Bore×Stroke (mm) | 4×98×105 | 4×93×105 |
| Cylinder Liner Type | Dry liner | Dry liner |
| Compression Ratio | 17.5 | 17.5 |
| Displacement (L) | 3.2 | 2.9 |
| Fuel System | High pressure common rail | High pressure common rail/Electric control VP pump |
| Governing Type | Electronic | Electronic |
| Speed Governing Rate (%) | 5 | 5 |
| Rated Power (kW) | 32-36.8 | 16-30 |
| Rated Speed (rpm) | 1500-1800 | 1500-1800 |
| Standby Power (kW) | 35-41 | 18-33 |
| Min. Fuel Consumption (g/kW·h) | 220 | 230 |
| Exhaust Smoke (FSN) | ≤2.5 | ≤2.5 |
| Lube Oil Capacity (L) | 6.5 | 6.5 |
| Cooling System Capacity (L) | 5.75 | 5.75 |
| Engine Oil Consumption (g/kW·h) | ≤0.6 | ≤0.6 |
| Noise (dB-A) | < 98 | < 96 |
| Emission Standard | STAGE IV | STAGE IV |
| Net Weight (kg) | 270 | 255 |
| Dimensions L×W×H (mm) | 660×555×712 | 660×555×700 |
| Flywheel Housing/Flywheel | SAE4#7.5 | SAE4#7.5 |
| Parameter | 4ZTAA4.1 (G21-G22) | 4ZT3.5-4.1 (G21) | 4ZT3.2 (G21) | 4Z3.2-G21 | 4Z3.0-G21 | 4Z2.7-G21 | 4Z2.3-G21 |
|---|
| Mechanical Frequency (Single Frequency) | / | / | 4ZT3.2-G11-G12 | 4Z3.2-G11-G12 | 4Z3.0-G11-G12 | 4Z2.7-G11-G12 | 4Z2.3-G11-G12 |
| Aspiration | Turbo & intercooler | Turbo | Turbo | Natural aspiration | Natural aspiration | Natural aspiration | Natural aspiration |
| No. of Cylinders×Bore×Stroke (mm) | 4×105×118 | 4×105×118 4×98×115 | 4×98×105 | 4×98×105 | 4×95×105 | 4×90×105 | 4×85×100 |
| Cylinder Liner Type | Dry liner | Dry liner | Dry liner | Dry liner | Dry liner | Wet liner | Wet liner |
| Compression Ratio | 18.5 | 18.5 | 18.5 | 18.1 | 18.1 | 18.1 | 18 |
| Displacement (L) | 4.1 | 3.5-4.1 | 3.2 | 3.2 | 3 | 2.7 | 2.3 |
| Fuel System | BQ inline pump | BQ inline pump | BQ inline pump | BQ inline pump | BQ inline pump | BQ inline pump | BQ inline pump |
| Governing Type | Electronic | Electronic | Electronic | Electronic | Electronic | Electronic | Electronic |
| Speed Governing Rate (%) | 5 | 5 | 5 | 5 | 5 | 5 | 5 |
| Governing Type | Mechanical | Mechanical | Mechanical | Mechanical | Mechanical | Mechanical | Mechanical |
| Speed Governing Rate (%) | / | / | 8 | 8 | 8 | 8 | 8 |
| Rated Power (kW) | 64-76 | 49-70 | 39-42 | 32-38 | 27-30 | 22-26 | 16-21 |
| Rated Speed (rpm) | 1500-1800 | 1500-1800 | 1500-1800 | 1500-1800 | 1500-1800 | 1500-1800 | 1500-1800 |
| Max. Power (kW) | 70-83 | 54-77 | 44-46 | 35-42 | 30-33 | 24-29 | 18-23 |
| Min. Fuel Consumption (g/kW·h) | 215 | 215 | 225 | 225 | 235 | 230 | 240 |
| Exhaust Smoke (FSN) | ≤2.5 | ≤2.5 | ≤2.5 | ≤2.5 | ≤2.5 | ≤2.5 | ≤2.5 |
| Lube Oil Capacity (L) | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 5.5 |
| Cooling System Capacity (L) | 8.54 | 6/8.54 | 5.75 | 5.75 | 5.75 | 5.3 | 4.65 |
| Engine Oil Consumption (g/kW·h) | ≤0.5 | ≤0.6/0.5 | ≤0.6 | ≤0.6 | ≤0.6 | ≤0.6 | ≤0.6 |
| Noise (dB-A) | ≤115 | ≤112-114 | ≤110 | ≤104 | ≤102 | ≤98 | ≤95 |
| Emission Standard | STAGE II | STAGE II | STAGE II | STAGE II | STAGE II | STAGE II | STAGE II |
| Net Weight (kg) | 370 | 285-360 | 275 | 265 | 265 | 260 | 220 |
| Dimensions L×W×H (mm) | 815×661×770 | 750×610×765 815×645×820 | 750×600×765 | 750×565×700 | 750×565×700 | 750×565×696 | 744×545×635 |
| Flywheel Housing/Flywheel | SAE3#11.5 | SAE3#11.5 | SAE3#11.5 | SAE4#7.5 | SAE4#7.5 | SAE4#7.5 | SAE4#7.5 |
| Parameter | 4ZTAA3.5 (G31) | 4ZTAA3.2 (G31-G34) |
|---|
| Aspiration | Turbo & intercooler | Turbo & intercooler |
| No. of Cylinders×Bore×Stroke (mm) | 4×98×115 | 4×98×105 |
| Cylinder Liner Type | Dry liner | Dry liner |
| Compression Ratio | 17.5 | 17.5 |
| Displacement (L) | 3.5 | 3.2 |
| Fuel System | High pressure common rail | High pressure common rail |
| Governing Type | Electronic | Electronic |
| Speed Governing Rate (%) | 5 | 3 |
| Rated Power (kW) | 74 | 39-70 |
| Rated Speed (rpm) | 1500-1800 | 1500-1800 |
| Standby Power (kW) | 81 | 44-77 |
| Min. Fuel Consumption (g/kW·h) | 215 | 215 |
| Exhaust Smoke (FSN) | ≤2.5 | ≤2.5 |
| Lube Oil Capacity (L) | 6.5 | 6.5 |
| Cooling System Capacity (L) | 5.75 | 5.75 |
| Engine Oil Consumption (g/kW·h) | ≤0.5 | ≤0.4 |
| Noise (dB-A) | < 108 | < 106 |
| Emission Standard | STAGE III | STAGE III |
| Net Weight (kg) | 275 | 270 |
| Dimensions L×W×H (mm) | 660×648×712 | 660×638×712 |
| Flywheel Housing/Flywheel | SAE3#11.5 | SAE3#11.5 |
| Parameter | 3ZT1.1 ( G41-G42) | 3Z1.1 ( G41-G42) |
|---|
| Aspiration | Turbo | Natural aspiration |
| No. of Cylinders×Bore×Stroke (mm) | 3×78×78.4 | 3×78×78.4 |
| Cylinder Liner Type | Dry liner | Dry liner |
| Compression Ratio | 18 | 18 |
| Displacement (L) | 1.1 | 1.1 |
| Fuel System | High pressure common rail | High pressure common rail |
| Governing Type | Electronic | Electronic |
| Speed Governing Rate (%) | 5 | 5 |
| Rated Power (kW) | 12.8-25 | 10-16.8 |
| Rated Speed (rpm) | 1500-3000 | 1500-3000 |
| Standby Power (kW) | 14.1-27 | 11-18.5 |
| Min. Fuel Consumption (g/kW·h) | 255 | 255 |
| Exhaust Smoke (FSN) | ≤2.5 | ≤2.5 |
| Lube Oil Capacity (L) | 4.5 | 4.5 |
| Cooling System Capacity (L) | 1.7 | 1.7 |
| Engine Oil Consumption (g/kW·h) | ≤0.4 | ≤0.4 |
| Noise (dB-A) | ≤94-102 | ≤92-100 |
| Emission Standard | STAGE IV | STAGE IV |
| Net Weight (kg) | 114 | 110 |
| Dimensions L×W×H (mm) | 530×390×590 | 530×390×590 |
| Flywheel Housing/Flywheel | SAE5#6.5 | SAE5#6.5 |
Application
- Standby and continuous-duty generator sets.
- Water pump and irrigation drives.
- Construction, mining and material-handling machinery.
- Repowering equipment whose original engine is no longer supported.
Frequently asked questions
How do I know this engine fits my generator set?
The 4Z2.3-G21 code must match the plate on the installed engine. If you are building a new set, start from the alternator rating and select the engine by speed and torque curve, not by nameplate kW alone.
Does it ship with documentation?
Yes. Every unit leaves with its datasheet and its 4Z2.3-G21 identification code. If your purchase requires a certificate of origin or a conformity certificate, state it in the quotation request so it is issued with the order.
Related products
See the full catalogue or request a quotation quoting the equipment reference. Third-party brands are cited for identification purposes only.
