Specifications
| Fuel | Gas |
|---|---|
| Frequency | 60.0 Hz |
| Standby power | 39 kW |
| Standby kVA | 49 |
| Emissions | Tier 1 |
| Controller | Decision-Maker 3000, Decision-Maker 550 |
| Oil capacity | 4.3 L |
| Alternator | Kohler 4P5 |
| Voltage options | 208 V, 600 V, 127/220 V, 120/240 V, 220/380 V, 277/480 V, 347/600 V |
| Phase | 3 |
| Power factor | 0.8 |
| Battery cranking | 630 CCA |
| Battery voltage | 12 V |
| Battery quantity | 1 |
| Coolant capacity | 6.8 L |
| Max ambient | 50 °C |
| Dimensions (L×W×H) | 2200×1040×1172 mm |
Engine
| Oil capacity | 5.7 L |
|---|---|
| Coolant capacity | 19.7 L |
| Displacement | 4.3 L |
| Aspiration | Natural Aspiration |
| Rated speed | 1800 rpm |
Maintenance & consumables
for the General Motors Industrial Powertrain Vortec 4.3 L| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Check for dirt or restriction | — | find | ||
| Fuel filter | As recommended by OEM | — | find | ||
| Oil filter | — | find | |||
| Belt | Belt, fan standard | GM16132 | Amazon eBay PartsGeek | ||
| Coolant | 50/50 antifreeze and water mixture, DexCool Long Life type, min 300F boiling point, -34F freezing point | 6.8 | — | ||
| Oil | GM Specification GM6094M | 5.7 | — | 150 hr |
Common questions
What is the power rating of the Kohler 40REZG?
The Kohler 40REZG is rated 39 kW standby (49.0 kVA).
What engine does the Kohler 40REZG use?
The Kohler 40REZG is powered by the General Motors Industrial Powertrain Vortec 4.3 L engine.
What fuel does the Kohler 40REZG use?
The Kohler 40REZG runs on Gas.
What is the oil capacity of the Kohler 40REZG?
The General Motors Industrial Powertrain Vortec 4.3 L engine in the Kohler 40REZG has an oil capacity of 5.7 liters.
What alternator does the Kohler 40REZG use?
The Kohler 40REZG uses a Kohler 4P5 alternator.
Parts
46| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 029032 | 46" HOSE 9/32 ID | 1 | Hose | PartsGeek |
| 035606 | SENSOR HI COOLANT SHUTDOWN | 1 | Sensor | PartsGeek |
| 037065 | SWITCH OIL PRESSURE | 1 | Sensor | PartsGeek |
| 047290 | 9" HOSE 3/8 ID SINGLE BRAID | 1 | Hose | PartsGeek |
| 050967 | 36" HOSE, 5/8" I.D. RIA 250F | 1 | Hose | PartsGeek |
| 052865 | GASKET CARBURETOR | 1 | Gasket | PartsGeek |
| 053667 | SENDER WATER TEMPERATURE | 1 | Sensor | PartsGeek |
| 057422 | HOSE 1IN 1D LP GAS | 1 | Hose | PartsGeek |
| 057448 | 12" HOSE 5/8 ID TYPE 3 SINGLE | 1 | Hose | PartsGeek |
| 057522 | SENSOR COOLANT LEVEL | 1 | Sensor | PartsGeek |
| 059057 | 10" HOSE 3/4 ID SAE-30R2 | 1 | Hose | PartsGeek |
| 061258 | GASKET AIR CLEANER | 1 | Gasket | PartsGeek |
| 064945 | GASKET CARBURETOR ADAPTOR | 1 | Gasket | PartsGeek |
| 069939 | HOUSING THERMOSTAT | 1 | Thermostat | PartsGeek |
| 0A2440 | GASKET THERMOSET | 2 | Gasket | PartsGeek |
| 0A4085 | GASKET EXHAUST MANIFOLD | 1 | Gasket | PartsGeek |
| 0A4277 | WIRES SPARK PLUG 4.3L | 1 | Spark plug | PartsGeek |
| 0A4374 | HOSE 4.3L STD UPPER | 1 | Hose | PartsGeek |
| 0A4375 | HOSE 4.3L STD LOWER | 1 | Hose | PartsGeek |
| 0A4637 | FILTER AIR 11.5" CA326 | 1 | Air filter | Amazon eBay $49.95 PartsGeek |
| 0A6283 | HOSE, PREFORMED BLOCK HEATER | 1 | Hose | PartsGeek |
| 0A8584 | BELT SERPENTNE 72.5" | 1 | Belt | PartsGeek FridayParts $31.60 |
| 0A9881 | 49.1 FT. GASKET DOOR RUBBER | 1 | Gasket | PartsGeek |
| 253107 | Element, Air Cleaner | 1 | Air filter | Amazon eBay $69.00 PartsGeek |
| 326232 | Block Heater | Block heater | PartsGeek | |
| 326233 | Block Heater | Block heater | PartsGeek | |
| A-273699 | Air Cleaner Assembly | 1 | Air filter | PartsGeek |
| GM16132 | Belt, fan standard | 1 | Belt | Amazon eBay PartsGeek |
| GM16178 | Starter | 1 | Starter | PartsGeek |
| GM75179 | Gasket, Exh Manifold (single) | 2 | Gasket | PartsGeek |
| GM75180 | Gasket, Exh Manifold (dual) | 2 | Gasket | PartsGeek |
| GM79552 | Radiator | Radiator | PartsGeek | |
| GM82861 | Hose, Intake | 1 | Hose | PartsGeek |
| GM82862 | Bracket, Air Cleaner | 1 | Air filter | PartsGeek |
| GM85017 | Belt, Alt | 1 | Belt | PartsGeek |
| GM86771 | Air Filter, Oil, qts. 5.0L GM83718 | 6.4 (14.1) | Air filter | PartsGeek |
| X-426-5 | Clamp, hose, 3.56/4.5 in. | 3 | Hose | PartsGeek |
| X-504-22 | Fuel line, flexible (1.50"id x 28.25") - correct part | Hose | PartsGeek | |
| 022676 | FUSE 15A X AGC15 | 1 | Service part / kit | eBay $14.50 PartsGeek |
| 024044A | ASSEMBLY BRUSH & SHUNT | 2 | Service part / kit | PartsGeek |
| 052624 | BEARING BALL 6212 SEALED | 1 | Service part / kit | PartsGeek |
| 058665 | BATTERY 12VDC 90-AH 27F (OPTIONAL) | 1 | Service part / kit | Amazon eBay $746.14 PartsGeek |
| 0A4121 | VALVE PCV | 1 | Service part / kit | PartsGeek |
| GM82973 | Mounting Bracket | 1 | Service part / kit | PartsGeek |
| M6923-06-80 | Nut, Hex 6mm | 2 | Service part / kit | PartsGeek |
| M933-06016-60 | Screw, hex cap, M6x16mm, js500 full thrd | 2 | Service part / kit | PartsGeek |
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 |
|---|---|---|---|
| Standby | 25% | 7.7 | |
| Standby | 50% | 10.2 | |
| Standby | 75% | 13.8 | |
| Standby | 100% | 16.5 |
Available documents
Brochure (Kohler)Brochure — G6-39 0918AZ (Kohler)Spec sheet (Kohler)Spec sheet — G4139 40REZG (Kohler)Parts manual — tp6730 (Kohler)Wiring diagram — tp6712 (Kohler)Wiring diagram — tp6799 (Kohler)