The Generac In-line 4 cyl. is a 4-cylinder engine rated at 1800 rpm. It powers generator sets from Generac, including the Guardian Series Liquid-Cooled 25 kW unit, Guardian Series Liquid-Cooled 30 kW unit, Guardian Series Liquid-Cooled 45 kW unit and Guardian Series Liquid-Cooled 60 kW unit.
Also known as: Generac In-line 4 cyl., In-line 4-Cyl.
| Cylinders | 4 |
|---|---|
| Rated speed | 1800 rpm |
Compiled from service & troubleshooting documentation across every generator set that uses the Generac In-line 4 cyl..
| Item | Action | Hours | Months | Notes |
|---|---|---|---|---|
| Replace fuel filter | Replace | 500 hr | ||
| Replace oil and filter | Change | 500 hr | ||
| Drain/flush coolant system | Drain | 1000 hr | ||
| Check coolant level and hoses | Check | First service | ||
| Check fuel level | Check | First service | ||
| Check oil level | Check | First service |
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 | Total Harmonic Distortion | <5% | ||
| Speed | Steady State Regulation (Governor) | ±0.25% | ||
| Torque | Operating temperature rise | 120 | °C above 40°C ambient | rated output |
| Voltage | Voltage Regulation | ±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 | Peak Fleet-Charge 50/50 ethylene glycol | -20°C to 48°C | 2.8 gal | Use demineralized or distilled water base | |
| Engine oil | SAE rated high detergent oil | API Service Class SF | for gasoline engines, similar to your car; refer to owner's manual for details | ||
| Engine oil | 15W-40 | API Service Class CD or better | -20°C to 48°C | Synthetic oil can be used in appropriate weight | |
| Fuel | Ultra Low Sulfur Diesel | below 40°C | Mechanical engine-driven pump, 5 micron filter (15/20/30 kW), 10 micron filter (48/50 kW) |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
| Code | Name | Meaning | Severity | Action |
|---|---|---|---|---|
| HIGH TEMPERATURE | High Temperature | Engine coolant temperature exceeds limit | Shutdown | |
| LOW OIL PRESSURE | Low Oil Pressure | Oil pressure below acceptable level | Warning | |
| NOT ACTIVATED | Not Activated | Unit will not start in AUTO with utility loss | Info | |
| OVERCRANK | Overcrank | Engine overcrank fault | Warning | |
| OVERLOAD | Overload | Unit overloaded, shuts down during operation | Shutdown | |
| RPM SENSE LOSS | RPM Sense Loss | Loss of engine RPM signal | Shutdown |
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 |
|---|---|---|---|---|
| 120/208 | 3 | Three phase | RD015, RD020, RD030, RD050 | |
| 120/240 | 1 | Single phase | RD015, RD020, RD030, RD048 | |
| 120/240 | 3 | Three phase | RD015, RD020, RD030, RD048, RD050 | |
| 277/480 | 3 | Three phase | RD030, RD048, RD050 |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
The Generac In-line 4 cyl. powers 9 generator set(s), including Generac Guardian Series Liquid-Cooled 25 kW unit, Generac Guardian Series Liquid-Cooled 30 kW unit, Generac Guardian Series Liquid-Cooled 45 kW unit, Generac Guardian Series Liquid-Cooled 60 kW unit, Generac RD015.
A commonly reported issue on generators using the Generac In-line 4 cyl. is: Unit will not start in AUTO with utility loss. Fix: Refer to activation section in Owner's Manual..