Mitsubishi In Line Engine
The Mitsubishi In Line is a 2.4 L 4-cylinder naturally aspirated engine rated at 1800 rpm, producing up to 40 kW. It powers generator sets from Generac, including the RD012, RD015, RD016 and RD020. It holds 6.5 L (1.7 gal) of oil and 11.4 L (3.0 gal) of coolant.
Also known as: Mitsubishi In Line
Engine specifications
| Oil capacity | 6.5 L |
|---|
| Coolant capacity | 11.4 L |
|---|
| Displacement | 2.4 L |
|---|
| Cylinders | 4 |
|---|
| Aspiration | Naturally Aspirated |
|---|
| Rated speed | 1800 rpm |
|---|
| Gross power | 40 kW |
|---|
Common problems
15- Warning active. SERVICE SCHEDULE C
Fix: Perform SERVICE SCHEDULE C maintenance; press ENTER to clear. - Warning active. SERVICE SCHEDULE B
Fix: Perform SERVICE SCHEDULE B maintenance; press ENTER to clear. - Warning active. SERVICE SCHEDULE A
Fix: Perform SERVICE SCHEDULE A maintenance; press ENTER to clear. - Warning active. LOW BATTERY
Fix: Clear alarm. From the MAIN menu on the control panel, navigate to the BATTERY MENU. Contact servicing dealer if battery is GOOD. Replace battery If CHECK BATTERY is displayed. - Warning active. CHARGER WARNING
Fix: Contact servicing dealer. - Warning active. BATTERY PROBLEM
Fix: Contact servicing dealer. - Unit will not start in AUTO with utility loss. UNDERVOLTAGE
Fix: Contact servicing dealer. - Unit will not start in AUTO with utility loss. UNDERSPEED
Fix: Contact servicing dealer. - Unit will not start in AUTO with utility loss. RPM SENSE LOSS
Fix: Clear alarm. From the MAIN menu on the control panel, navigate to the BATTERY MENU. Contact servicing dealer if battery is GOOD. Replace battery If CHECK BATTERY is displayed. - Unit will not start in AUTO with utility loss. OVERVOLTAGE
Fix: Contact servicing dealer. - Unit will not start in AUTO with utility loss. OVERSPEED
Fix: Contact servicing dealer. - Unit will not start in AUTO with utility loss. OVERCRANK
Fix: Clear alarm. Attempt to start the unit in MANUAL. If it does not start or starts and runs rough, contact servicing dealer. - Unit will not start in AUTO with utility loss. NOT ACTIVATED
Fix: Refer to activation section in Owner’s Manual. - Unit will not start in AUTO with utility loss. MISWIRE
Fix: Contact servicing dealer. - Unit will not start in AUTO with utility loss. LOW OIL PRESSURE
Fix: Check oil level. Add oil per Owner’s Manual. Contact servicing dealer if oil level is correct.
Compiled from service & troubleshooting documentation across every generator set that uses the Mitsubishi In Line.
Maintenance schedule
| Item | Spec | Capacity | Part # | Interval | |
|---|
| Air filter | 6 – 15 & 20 kW | | G006505-0 | 500 hr | Amazon eBay |
| Fuel filter | 6 – 15 & 20 kW | | G006504-0 | 500 hr | Amazon eBay |
| Oil filter | 6 – 15 & 20 kW | | G006478-0 | 500 hr | Amazon eBay |
| Battery | Group 27F, 700 CCA | | G006508-0 | 1000 hr | Amazon eBay |
| Belt | N/A – 15 & 20 kW | | G006507-0 | 1000 hr | Amazon eBay |
| Coolant | | 3.0 | — | 1800 hr | |
| Coolant filter | 6 – 15 & 20 kW | | — | | |
| Oil | | 6.5 | — | 1080 hr | |
| Spark plug | N/A | | G006509-0 | 1000 hr | Amazon eBay |
Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.
Service intervals
6| 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.
Service specifications
4| 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.
Recommended fluids
| 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 | 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.
Fault codes
6| 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 reconnection
| 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.
Common questions
What is the oil capacity of the Mitsubishi In Line?
The Mitsubishi In Line engine has an oil capacity of 6.5 liters.
What is the displacement of the Mitsubishi In Line?
The Mitsubishi In Line has a displacement of 2.4 liters with 4 cylinders.
Which generators use the Mitsubishi In Line engine?
The Mitsubishi In Line powers 6 generator set(s), including Generac RD012, Generac RD015, Generac RD016, Generac RD020, Generac RD048.
How often should you change the oil in the Mitsubishi In Line?
The Mitsubishi In Line oil change interval is every 1080 hours.
What is a common problem with the Mitsubishi In Line engine?
A commonly reported issue on generators using the Mitsubishi In Line is: Warning active. SERVICE SCHEDULE C. Fix: Perform SERVICE SCHEDULE C maintenance; press ENTER to clear..