The Cummins/Onan 4.0EGHW is a 4 L natural engine rated at 3600 rpm. It powers generator sets from Cummins/Onan. It holds 1.16 L (0.3 gal) of oil and 1.1 L (0.3 gal) of coolant.
Also known as: Onan 4.0EGHW
| Oil capacity | 1.16 L |
|---|---|
| Coolant capacity | 1.1 L |
| Displacement | 4.0 L |
| Aspiration | Natural |
| Rated speed | 3600 rpm |
How to read your Cummins/Onan engine serial & model number →
| Symptom | Cause | Remedy |
|---|---|---|
| FAILS TO CRANK (ELECTRIC START MODELS) | Low Battery, Bad battery connection, Oil is too heavy, Load is connected | Check battery electrolyte level and charge. Clean and tighten all battery and cable connections. Replace with lighter oil. Always disconnect load while starting. |
| CRANKS SLOWLY (ELECTRIC START MODELS) | Choke closed, Dirty air filter, Rich fuel mixture | Open choke. Clean or replace air filter. Contact an Onan service center. |
| ENGINE WONT START | Loose or worn spark plug lead, Faulty spark plug, Dirty fuel filter or generator set at too steep of an angle, Governor out of adjustment or lean fuel mix | Check spark plug lead connection. Remove and clean or replace spark plug. Check fuel filter and generator set angle. Contact an Onan service center. |
| EXHAUSTING BLACK SMOKE | Open DC circuit breaker due to an overload | Remove all loads, reset circuit breaker, check for an overload or short circuit. Do not exceed generator set rated load specifications. |
| UNIT RUNS THEN STOPS | Add fuel. Add oil. Reduce oil level. | |
| UNIT RUNS BUT SURGES | Add fuel. Add oil. Reduce oil level. | |
| NO AC OUTPUT VOLTAGE | Open AC circuit breaker due to an overload | Remove all loads, re-set circuit breaker, check tools or appliances being used for defects. Do not exceed generator set rated load specifications. |
Fault codes and symptom→remedy steps extracted from this engine’s service/owner documentation; verify against the official manual before servicing.
Compiled from service & troubleshooting documentation across every generator set that uses the Cummins/Onan 4.0EGHW.
The Cummins/Onan 4.0EGHW engine has an oil capacity of 1.16 liters.
The Cummins/Onan 4.0EGHW has a displacement of 4.0 liters.
The Cummins/Onan 4.0EGHW powers 1 generator set(s), including Cummins/Onan 4.0EGHW.
A commonly reported issue on generators using the Cummins/Onan 4.0EGHW is: UNIT RUNS THEN STOPS. Fix: Add fuel. Add oil. Reduce oil level..