Honda GX630 Engine
The Honda GX630 is a 0.07 L 1-cylinder forced-air engine rated at 3600 rpm, producing up to 14.1 kW. It powers generator sets from Dewalt and Honda, including the DXGN14000 and EB10000. It holds 2.1 L (0.6 gal) of oil.
Also known as: Honda GX630
Engine specifications
| Oil capacity | 2.1 L |
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| Coolant capacity | 0.0 L |
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| Displacement | 0.0688 L |
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| Cylinders | 1 |
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| Aspiration | Forced-air |
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| Rated speed | 3600 rpm |
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| Gross power | 14 kW |
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Common problems
15- The Oil Alert indicator will illuminate.
Fix: Check the engine oil level (see page 48) before troubleshooting in other areas. To reset the Oil Alert indicator, turn the engine switch to the OFF position, add the proper amount of oil (see page 49), and then turn the engine switch back to the ON position. - The display starts to blink.
Cause: If you turn the engine switch to the ON position but don't start the engine within 1 minute, or when the engine stops due to an error.
Fix: Start the engine or turn the engine switch to the OFF position. - ROM/RAM failure E-32
Fix: Engine stops - OIL ALERT INDICATOR comes on when you turn the engine switch to the START position
Fix: Check the engine oil level (see page 48) before troubleshooting in other areas. - High AC voltage E-31
Fix: Engine stops - GFCI System ② will shut off the power to that 120 V 20 A DUPLEX RECEPTACLE
Cause: If there is a ground-fault current from either 120 V 20 A DUPLEX RECEPTACLE. - GFCI System ① will shut off power to all receptacles, including GFCI system ② and AC Circuit Breaker
Cause: If there is a ground-fault current from either A, B or C receptacle. - FET overheat E-33
Fix: Generator stops - Failed to read out accumulated hours Communication error
Fix: Contact an authorized Honda generator dealer. - Even when oil is added to the engine, the generator will not restart until the Oil Alert indicator is reset.
Fix: Turn the engine switch to the OFF position, add the proper amount of oil (see page 49), and then turn the engine switch back to the ON position. - Error messages are displayed on the i-Monitor display.
Fix: Contact an authorized Honda generator dealer. - Engine over rev E-04
Fix: Engine stops - Contact an authorized Honda generator dealer. Communication error
- CIRCUIT PROTECTOR for Receptacle (1-4) OFF
Fix: Check that the appliance is working properly and does not exceed the rated load capacity of the circuit before resetting the AC circuit protector ON. - Backlight blinks
Fix: Start the engine or turn the engine switch to the OFF position. The display also blinks when the engine stops due to an error.
Compiled from service & troubleshooting documentation across every generator set that uses the Honda GX630.
Service specifications
2| Type | Item | Value | Unit | Condition |
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| Speed | Engine speed protection limit (DAVR self-diagnosis) | 4140 | rpm | abnormal voltage/speed sustained longer than 3 seconds |
| Voltage | Voltage regulation stability (DAVR) | within 1 | % | standard operation |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Aftermarket parts that fit this engine
38Parts listed by aftermarket suppliers as fitting this engine — leads compiled from supplier catalogs; verify the exact part for your serial number.
Common questions
What is the oil capacity of the Honda GX630?
The Honda GX630 engine has an oil capacity of 2.1 liters.
What is the displacement of the Honda GX630?
The Honda GX630 has a displacement of 0.0688 liters with 1 cylinders.
Which generators use the Honda GX630 engine?
The Honda GX630 powers 3 generator set(s), including Dewalt DXGN14000, Honda EB10000, Honda GX630.
What is a common problem with the Honda GX630 engine?
A commonly reported issue on generators using the Honda GX630 is: The Oil Alert indicator will illuminate.. Fix: Check the engine oil level (see page 48) before troubleshooting in other areas. To reset the Oil Alert indicator, turn the engine switch to the OFF position, add the proper amount of oil (see page 49), and then turn the engine switch back to the ON position..