The Cummins/Onan QSB5-G6 is a 4.5 L 4-cylinder turbocharged and charge air cooled engine rated at 1800 rpm, producing up to 155 kW. It powers generator sets from Cummins/Onan, including the C125 D6C and QSB5G6. It holds 12.2 L (3.2 gal) of oil.
Also known as: Cummins Inc. QSB5-G6
Part of the Cummins/Onan QSB5 engine family — 9 variants share parts & fitment.
| Oil capacity | 12.2 L |
|---|---|
| Displacement | 4.5 L |
| Cylinders | 4 |
| Aspiration | Turbocharged and charge air cooled |
| Rated speed | 1800 rpm |
| Gross power | 155 kW |
How to read your Cummins/Onan engine serial & model number →
| Type | Item | Value | Unit | Condition |
|---|---|---|---|---|
| Other | AFLEX-H (shake table test datum) | <=3.200 | g | AC156, tri-axial, 5% damping SRS |
| Other | AFLEX-V (shake table test datum) | <=1.333 | g | AC156, tri-axial, 5% damping SRS |
| Other | ARIG-H (shake table test datum) | <=2.400 | g | AC156, tri-axial, 5% damping SRS |
| Other | ARIG-V (shake table test datum) | <=0.533 | g | AC156, tri-axial, 5% damping SRS |
| Other | Ground snow load limit | 30 | psf | For indoor (covered) and outdoor (exposed) installation |
| Other | Horizontal design seismic coefficient (z/h = 0.0) | 1.440 | g | Certified seismic design level, IBC Importance IP <= 1.5, Soil Classes A-E, Risk Categories I-IV, Design Categories A-F, SDS <= 2.000 g |
| Other | Random frequency variation | 0.5 | % | |
| Other | SDS (g) at z/h=1 for C10 D6 - C60 D6 | 2.0 | g | Certified SDS, z/h = 1 |
| Other | SDS (g) at z/h=1 for C50 D6C - C125 D6C | 2.5 | g | Certified SDS, z/h = 1 |
| Other | ZPA-H (shake table test datum) | <=2.160 | g | AC156, tri-axial, 5% damping SRS |
| Other | ZPA-V (shake table test datum) | <=0.480 | g | AC156, tri-axial, 5% damping SRS |
| Speed | Rated speed | 1800 | rpm | |
| Temperature | Alternator standard temperature rise | 120 | C | Standby |
| Voltage | Random voltage variation | 1.0 | % | |
| Voltage | Voltage regulation, no load to full load | 1.0 | % | no load to full load |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
| Part # | Description | Category |
|---|---|---|
| 0179-3714 | Air Cleaner Instl | air_filter |
| PI144D1 | Alternator Model | alternator |
| UC274C | Alternator Model | alternator |
| UC274K | Alternator Model | alternator |
| 8C-3627 | Fuel Filter | fuel_filter |
| 250-0486 | Oil Filter | oil_filter |
| 0100-3853-01 | Engine-Diesel (4ISBeG1) | other_service |
| 0179-3628 | Radiator Assy | other_service |
| 0179-4344 | Outlet Sockets Box Instl | other_service |
| 0179-4365 | Fuel System Instl | other_service |
| 0179-4466 | Circuit Breaker Assy | other_service |
| 0179-4472 | Heater Instl | other_service |
| 0179-4517 | Skid Assy (XRS) | other_service |
| 0179-4542 | Battery Isolator Assy | other_service |
| 0300-6029 | Accessory Instl | other_service |
| 0338-0000 | Harnesses | other_service |
| 0403-5265-02 | Spacer-Generator (UC274C) | other_service |
| 0403-5835-02 | Skid | other_service |
| 0403-5850-02 | Skid | other_service |
| 0403-5962 | End Cap-Skid | other_service |
| 0403-5966 | End Cap-Skid (Assy) | other_service |
| 0405-8842 | Enclosure | other_service |
| 101-4000 | Gasket | other_service |
| 127-0826 | Battery | other_service |
| 153-5720 | Battery | other_service |
| 250-0488 | Spark Plug | other_service |
| 8C-3600 | Battery | other_service |
| 8C-3601 | Battery | other_service |
| 8C-3620 | Belt | other_service |
| V2403-M-E3BG | Engine Model | other_service |
Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.
The Cummins/Onan QSB5-G6 engine has an oil capacity of 12.2 liters.
The Cummins/Onan QSB5-G6 has a displacement of 4.5 liters with 4 cylinders.
The Cummins/Onan QSB5-G6 powers 2 generator set(s), including Cummins/Onan C125 D6C, Cummins/Onan QSB5G6.