The Cummins/Onan GTA855E is a 14 L 6-cylinder turbocharged and coolant-air aftercooled engine rated at 1800 rpm, producing up to 351 kW. It powers generator sets from Cummins/Onan, including the C250, C300N6 and GFBC. It holds 34 L (9.0 gal) of oil and 136 L (35.9 gal) of coolant.
Also known as: Cummins GTA855E
| Oil capacity | 34.0 L |
|---|---|
| Coolant capacity | 136.0 L |
| Displacement | 14.0 L |
| Cylinders | 6 |
| Aspiration | Turbocharged and coolant-air aftercooled |
| Rated speed | 1800 rpm |
| Gross power | 351 kW |
How to read your Cummins/Onan engine serial & model number →
Compiled from service & troubleshooting documentation across every generator set that uses the Cummins/Onan GTA855E.
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | — | ||||
| Fuel filter | 149-0751 | Amazon eBay | |||
| Oil filter | — | ||||
| Battery | — | ||||
| Belt | — | ||||
| Coolant | 136.0 | — | |||
| Oil | 34.0 | — | |||
| Spark plug | — |
Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.
| Item | Action | Hours | Months | Notes |
|---|---|---|---|---|
| filters | Change | 1000 hr | with CENTINEL, depending on load factors | |
| fuel filter | Change | 1500 hr | Fleetguard NanoNet media | |
| engine oil | Change | 4500 hr | with CENTINEL, railway applications |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
| Type | Item | Value | Unit | Condition |
|---|---|---|---|---|
| Other | BMEP at set rated load | 243 | psi | |
| Other | Battery charging alternator | 37 | amps | |
| Other | Compression ratio | 8.5:1 | ||
| Other | Cranking Current | 900 | amps | at ambient temperature of 0 °C (32 °F) |
| Other | Cranking current | 880 | amps | at ambient temp of 0 °C (32 °F) |
| Other | Frequency regulation | Isochronous | ||
| Other | Maximum speed | 2250 | rpm | |
| Other | Piston speed | 1795 | ft./min | |
| Other | Random frequency variation | ±0.5 | % | |
| Other | Regenerative power | 33 | kW | |
| Pressure | Catalyst back pressure | 20.4 | in. H2O | |
| Pressure | Fuel inlet pressure at GenSet connection | 356 to 508 | mm WC (14 to 20 in. WC) | |
| Pressure | Fuel inlet pressure maximum operating | 20 | in. H2O | |
| Pressure | Fuel inlet pressure minimum operating | 14 | in. H2O | |
| Pressure | Max air cleaner restriction (dirty filter) | 15 | in. H2O | |
| Pressure | Max allowable system back pressure | 47.7 | in. H2O | |
| Pressure | Max cooling air flow static restriction | 0.5 | in. H2O | |
| Pressure | Running Pressure to Engine (Natural Gas) | 381 to 508 | mm WC | |
| Pressure | Silencer back pressure (factory enclosed units only) | 5.6 | mm Hg (.22 in. Hg) | Factory enclosed units only |
| Pressure | Total system back pressure allowed | 51 | mm Hg (2 in. Hg) | |
| Resistance | Rotor resistance | 1.05 | Ohms | @ 22°C |
| Resistance | Stator resistance (L-L) | 0.0248 | Ohms | @ 22°C |
| Speed | Overspeed limit | 2100 | rpm | |
| Speed | Rated Speed | 1800 | rpm | |
| Temperature | Ambient design | 104 | °F | |
| Temperature | Exhaust temp | 1146 | °F | |
| Temperature | Maximum Gas Temperature - Dry Stack | 659 | °C | Full Load |
| Temperature | Standard temperature rise (alternator) | 125 | °C | |
| Torque | Tightening torque (circuit breaker lug) | 442.54 | Lbf.In | AWG 3/0...500 kcmil |
| Voltage | Excitation current full load | 2.3 – 2.2 | Amps | full load |
| Voltage | Excitation current no load | 0.7 – 0.5 | Amps | no load |
| Voltage | Random voltage variation | ±1 | % | Three-phase only |
| Voltage | Voltage regulation, no load to full load | ±1 | % |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
| Fluid | Grade | Standard | Ambient | Capacity | Notes |
|---|---|---|---|---|---|
| Coolant | 50/50 Mix | 136.0 L | System filled prior to shipment; Anti-Freeze 50/50 mix | ||
| Fuel | Low Pressure Dry Processed Natural Gas | 905 BTU/ft.3 L.H.V. (33.72 kJ/L) | Running pressure to engine 381 to 508 mm WC (15 to 20 in. WC); minimum gas supply pipe size @ engine 50.8 mm (2.0 in.) | ||
| Fuel | NG (natural gas) | Fuel inlet pressure at GenSet connection: 356 to 508 mm WC (14 to 20 in. WC) | |||
| Fuel | Natural gas | Fuel consumption at 100% load: 4098 SCFH; Required operating fuel pressure: 14-20 in H2O |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Tools: wire seal MICROTUSEAL
Tools: test kit
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
| Voltage | Phase | Connection | Leads | Notes |
|---|---|---|---|---|
| 208/416 | 3 | 12 | winding 311 | |
| 220/440 | 3 | 12 | winding 311 | |
| 230/460 | 3 | 12 | winding 311 | |
| 240 Delta | 3 | 12 | winding 311 | |
| 240/480 | 3 | 12 | winding 311 | |
| 277/480 | 3 | 12 | genset rated voltage, 3ph |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
The Cummins/Onan GTA855E engine has an oil capacity of 34.0 liters.
The Cummins/Onan GTA855E has a displacement of 14.0 liters with 6 cylinders.
The Cummins/Onan GTA855E powers 4 generator set(s), including Cummins/Onan C250, Cummins/Onan C300N6, Cummins/Onan GFBC, Cummins/Onan GTA855E.
A commonly reported issue on generators using the Cummins/Onan GTA855E is: General prime mover protection. Fix: Low and high battery voltage warning - Indicates status of the battery charging system (failure) by continuously monitoring battery voltage. Weak battery warning - The control system will test the battery each time the genset is signaled to start and indicate a warning if the battery indicates impending failure. Low coolant level warning – Can be set up to be a warning or.