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 |
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| Coolant capacity | 11.4 L |
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| Displacement | 2.4 L |
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| Cylinders | 4 |
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| Aspiration | Naturally Aspirated |
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| Rated speed | 1800 rpm |
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| Gross power | 40 kW |
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Common problems
15- Unit will not start in AUTO with utility loss NOT ACTIVATED
Fix: Refer to activation section in Owner's Manual. - 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. - The engine will not crank
Cause: Fuse blown
Fix: Replace 7.5 amp fuse in generator control panel. Correct short circuit condition if fuse blows again. - Unit consumes large amounts of oil
Cause: Engine over filled with oil
Fix: Adjust oil to correct level. - There is no transfer to standby after utility source failure
Cause: Defective transfer switch coil
Fix: * - The engine cranks but will not start
Cause: Out of fuel
Fix: Replenish fuel. Turn on fuel valve. - Unit shuts down during operation HIGH TEMPERATURE
Fix: Check ventilation around the intake, exhaust and rear of generator. Contact serving dealer if no obstruction is found. - There is no AC output from the generator
Cause: Main line circuit breaker is in the OFF (OPEN) position
Fix: Reset circuit breaker to ON (CLOSED) position. - The generator is set to OFF, but the engine continues to run
Cause: Defective keypad
Fix: * - Unit was running and shuts down, attempts to restart RPM SENSE LOSS
Fix: Clear alarm and remove household loads from the generator. Put back in AUTO and restart. If problem returns, contact servicing dealer to investigate possible fuel issue. - Unit running in AUTO but no power in house
Fix: Check MLCB. Contact servicing dealer if MLCB is in the ON position. - The engine starts hard and runs rough
Cause: Air cleaner plugged or damaged
Fix: Check/replace air cleaner. - Open F1 5 amp fuse F1
Fix: Replace F1 5 amp fuse if fuse blows again.* - No AC output from generator.
Cause: Check main line circuit breaker; Check circuit breaker & fuses; Transfer switch set to NORMAL position; Generator internal failure; Thermal circuit breaker open
Fix: 1. Reset to ON or CLOSED; 2. Reset and replace, if necessary; 3. Set to GENERATOR position; 4. *Contact the nearest Authorized Dealer for assistance; 5. Auto-reset - Wait 5 min. and attempt restart - Engine won’t crank.
Cause: 15 amp fuse blown; Loose or corroded or defective battery cables; Defective starter contactor; Defective starter motor; Dead or Defective Battery
Fix: 1. Replace fuse; 2. Tighten, clean or replace battery cables as necessary; 3. Replace contactor; 4. Replace starter motor
Compiled from service & troubleshooting documentation across every generator set that uses the Mitsubishi In Line.
Maintenance schedule
| Item | Spec | Capacity | Part # | Interval | |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 4 generator set(s), including Generac RD012, Generac RD015, Generac RD016, Generac RD020.
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: Unit will not start in AUTO with utility loss. Fix: Refer to activation section in Owner's Manual..