Service parts for the 4000
Grouped by system, with how many of each the parts manual calls for.
Air intake
1 requiredFuel system
1 requiredPrices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.
Specifications
| Standby power | 4 kW |
|---|---|
| Oil capacity | 3.3 L |
Maintenance & consumables
for the Cummins/Onan EM (SN5782U1G2RA)| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Breaker Ampere Rating 1600A | N16SB | Amazon eBay | ||
| Fuel filter | Fuel, Spin-On | FF5039 | Amazon $78.00 eBay $26.99 | ||
| Oil filter | — | 150 hr | |||
| Battery | — | 150 hr | |||
| Belt | — | ||||
| Coolant | — | ||||
| Oil | 3.5 quarts | — | 50 hr | ||
| Spark plug | — | 300 hr |
Common questions
What size generator is the Cummins/Onan 4000?
The Cummins/Onan 4000 is rated 4 kW standby.
What engine does the Cummins/Onan 4000 use?
The Cummins/Onan 4000 is powered by the Cummins/Onan EM (SN5782U1G2RA) engine.
What's the oil capacity on a Cummins/Onan 4000?
The Cummins/Onan EM (SN5782U1G2RA) engine in the Cummins/Onan 4000 has an oil capacity of 3.3 liters.
What fuel filter does the Cummins/Onan 4000 use?
The Cummins/Onan 4000 uses fuel filter part number FF5039.
What air filter fits the Cummins/Onan 4000?
The Cummins/Onan 4000 uses air filter part number N16SB.
Troubleshooting
6Symptoms & remedies
| Symptom | Remedy |
|---|---|
| The engine fails to crank. | A. Try starting at the genset rather than at the remote control. b. Replace fuse F1 on the control panel if it has blown. c. Clean and tighten the positive (+) and negative (-) battery cable connections at the battery and the genset. d. Recharge the battery. Refer to the battery manufacturer's recommendations. |
| The engine cranks slowly. | A. Disconnect the air conditioner and other large loads. b. Clean and tighten the positive (+) and negative (-) battery cable connections at the battery and the genset. c. Recharge the battery. Refer to the battery manufacturer's recommendations. d. Change the engine oil to oil having the proper viscosity for the ambient temperature. See Table 1. |
| The engine cranks but fails to start. | A. Check the fuel tank and fill if necessary. b. Open any closed fuel shut off valve. c. Check engine oil level and add oil as necessary. d. Replace fuse F2 (side of control panel) if it has blown. e. Service the air cleaner. f. Secure the spark plug leads on the spark plugs. g. Replace the spark plugs. |
| The engine runs and then stops or surges. | A. Check the fuel tank and fill if necessary. b. Check the engine oil level and add oil as necessary. Drain excess oil if the level is above the dipstick Full mark. c. Check and reset the carburetor preheater lever and altitude adjust knob. See Varying Weather and Altitude. d. Secure the spark plug leads on the spark plugs. e. Replace the spark plugs. |
| There is no electrical power even though the genset runs. | A. Reset tripped circuit breakers. See Powering Equipment. b. Unless there is an automatic power transfer switch, plug the boat power cord into the genset power output receptacle (if so equipped) or turn the pontoon boat power selector switch to its genset position (if so equipped). |
| The remote battery condition meter indicates low voltage. | A. Clean and tighten the positive (+) and negative (-) battery cable connections at the battery and the genset. b. Recharge the battery. Refer to the battery manufacturer's recommendations. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing. Full Cummins/Onan 4000 troubleshooting guide (8 entries) →
Parts
70| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 015-0074 | Steering Wheel Mounting Disk (Rubber) | 1 | Steering wheel mounting disk | Amazon eBay |
| 050-0030 | Steering Wheel | 1 | Steering wheel | Amazon eBay |
| 103-0810 | Gasket, Mounting - Gearcase | 1 | Gasket | Amazon eBay |
| 122-0320 | Adapter, Oil Filter | 1 | Oil filter | Amazon Amazon eBay eBay |
| 122-0360 | Drain, Oil Filter (Unpainted/Painted) | 1 | Oil filter | Amazon eBay |
| 122-0645 | Oil Filter | 1 | Oil filter | Amazon $14.11 eBay $11.99 |
| 122-0774 | Filter, Oil | 1 | Oil filter | Amazon eBay $12.48 |
| 140-1087 | Gasket, Horn - Air | 3 | Gasket | Amazon eBay |
| 149-1994 | Pump, Fuel - Electric (Serial F860825839-F863114065) | 1 | Pump | Amazon eBay |
| 149-2110 | Pump, Fuel - Electric (Begin F860825893) | 1 | Pump | Amazon eBay |
| 153-0554 | Element, Thermostat | 1 | Thermostat | Amazon eBay |
| 191-1599 | Starter, 12 Volt Motor (Spec A) | 1 | Starter | Amazon eBay |
| 191-1667 | Starter, 12 Volt Motor (Begin Spec B) | 1 | Starter | Amazon eBay |
| 509-0040 | Seal, Oil - Crankshaft | 1 | Seal | Amazon eBay $9.95 |
| AMC5NN8286D | Radiator Hose, Lower | Hose | Amazon eBay | |
| AMP192-DBGVCC | Reman Injection Pump | Pump | Amazon eBay | |
| AMP4000-DPA | Reman Injection Pump | Pump | Amazon eBay | |
| AN500T0122 | STARTER MOTOR - Aftermarket Manufacture | Starter | Amazon eBay | |
| AN500T0127 | STARTER MOTOR | Starter | Amazon eBay | |
| FF5039 | Fuel, Spin-On | Fuel filter | Amazon $78.00 eBay $26.99 | |
| M-1604-9 | Spark Plug (Gasoline) | 1 | Spark plug | Amazon eBay |
| N16SB | Breaker Ampere Rating 1600A | Air filter | Amazon eBay | |
| SN5782U1G2RA | NAMEPLATE | 1 | Nameplate | Amazon eBay |
| 101-0450 | Screw, Cap - Hex Head 3/8-16 x 1-1/4" | 1 | Service part / kit | Amazon eBay FridayParts $799.90 |
| 103-0772 | Gearcase | 1 | Service part / kit | Amazon eBay |
| 110-0197 | Insert, Valve Seat - Intake | 2 | Service part / kit | Amazon eBay $27.99 |
| 110-1824 | Bearing, Crankshaft - Rear (Standard .002" .010" .020" .030" Undersize) | 1 | Service part / kit | Amazon eBay |
| 110-1879-01 | Washer, Lock (3/8") | 1 | Service part / kit | Amazon eBay |
| 110-3527 | Insert, Valve Seat - Exhaust | 2 | Service part / kit | Amazon eBay |
| 113-0189 | Ring, Retaining - Piston (Standard .005" .010" .020" .030" .040" Oversize) | 2 | Service part / kit | Amazon eBay $49.99 |
| 114-0240 | Rod, Connecting (Standard .010" .020" .030" Undersize) | 4 | Service part / kit | Amazon eBay |
| 114-0257 | Ring Set, Piston (Standard .010" .020" .030" Undersize) | 2 | Service part / kit | Amazon eBay |
| 123-1174 | Spring, Breather Valve | 1 | Service part / kit | Amazon eBay |
| 123-1175 | Reed, Breather Valve | 1 | Service part / kit | Amazon eBay |
| 140-1891 | Element, Cleaner - Air | 21 | Service part / kit | Amazon eBay $11.55 |
| 140-1894 | Housing, Cleaner - Air | 1 | Service part / kit | Amazon eBay |
| 150-1187 | Screw, Machine - Pan Head (#8-32 x 3/8") | 2 | Service part / kit | Amazon eBay |
| 153-0555 | Housing Assembly, Choke | 1 | Service part / kit | Amazon eBay |
| 153-0556 | Bracket, Mounting - Diaphragm | 1 | Service part / kit | Amazon eBay |
| 153-0563 | Clip, U' - Diaphragm Mounting | 2 | Service part / kit | Amazon eBay |
| 153-0567 | Bi-Metal, Choke | 11 | Service part / kit | Amazon eBay |
| 154-2447 | Manifold, Intake | 1 | Service part / kit | Amazon eBay |
| 166-0747 | Clamp, Coil | 3 | Service part / kit | Amazon eBay |
| 166-0772 | Coil, Ignition | 1 | Service part / kit | Amazon eBay |
| 167-1605-02 | Cable, Plug - Spark (135" Boot, Spec A-C) | 1 | Service part / kit | Amazon eBay |
| 167-1615-01 | Cable, Spark Plug 9' | 1 | Service part / kit | Amazon eBay |
| 212000 | Fax: 0044 (0) 1743 212700 | Service part / kit | Amazon eBay | |
| 223141 | Fax: 0044 (0) 1785 215110 | Service part / kit | Amazon eBay | |
| 226-2980 | Switch, Low Oil Pressure | 10 | Service part / kit | Amazon eBay |
| 300-2784 | Emerald Control Board | Service part / kit | eBay | |
| 300-3056/3687 | Emerald Control Board | Service part / kit | buy | |
| 300-3763-01 | Emerald/Marquis Control Board | Service part / kit | eBay | |
| 300-3950 | Control Board Replacement Kit | 1 | Service part / kit | eBay |
| 312-0249 | Condenser, Ignition | 6 | Service part / kit | Amazon eBay $63.34 |
| 323-1486 | Sockets | Service part / kit | Amazon eBay | |
| 323-1487-04 | Onan 16-Socket Connector | Service part / kit | Amazon eBay | |
| 420-0572 | Control board tester | Service part / kit | eBay | |
| 516-0141 | 2 "Pin, Gear Cover Locating | 1 | Service part / kit | Amazon eBay |
| 564625 | Fax: 0039 (0) 31 565480/564145/396001 | Service part / kit | Amazon eBay | |
| 582240 | Perkins Engines Company Limited | Service part / kit | Amazon eBay | |
| 583000 | Telex: 32501 Perken G | 1 | Service part / kit | Amazon eBay |
| 610181 | Service part / kit | Amazon eBay | ||
| 610182 | Service part / kit | Amazon eBay | ||
| 815-0590 | Screw, Hex Head (Special) | 10 | Service part / kit | Amazon eBay |
| 850-0050 | Washer, Lock - Spring (3/8”) | 4 | Service part / kit | Amazon eBay |
| 870-0302 | Nut, Self-Locking (5/16-24) | 28 | Service part / kit | Amazon eBay |
| A30816 | Fax: 0061 (0) 597 1305 | Service part / kit | Amazon eBay | |
| M-1604-1 | 1/4 in. barb fitting | 1 | Service part / kit | Amazon eBay |
| M-1604-14 | Governor Adjustment | 1 | Service part / kit | Amazon eBay |
| M1604 | BGE AND BGEL GENERATOR SETS | Service part / kit | Amazon eBay |
Service, wear & replacement parts referenced for this model and its engine — confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.
Fuel consumption
| Rating | Load | L/h | gal/h |
|---|---|---|---|
| Prime | 0.6 | 2.3 | |
| Standby | 0.4 | 1.5 |