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 |
| 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 4.3L| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | 0A4637 | 200 hr | Amazon eBay $49.95 | ||
| Fuel filter | — | 200 hr | find | ||
| Oil filter | 0A37970001 | 200 hr | Amazon eBay $16.00 | ||
| Belt | — | 200 hr | find | ||
| Coolant | 17.0 L | — | |||
| Oil | SAE 10W-30 | 5.7 Qts | — | 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 4.3L 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 4.3L engine in the Kohler 40REZG has an oil capacity of 5.7 liters.
Parts
38| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 254471 | Element, air cleaner | 1 | Air filter | Amazon eBay $94.38 |
| 326230 | Block Heater | Block heater | buy | |
| 326231 | Block Heater | Block heater | buy | |
| 326232 | Block Heater | Block heater | buy | |
| 326233 | Block Heater | Block heater | buy | |
| GM16123 | Bracket, pulley | 1 | Belt | buy |
| GM16151 | Retainer, spark plug wire (3) | 2 | Spark plug | buy |
| GM16180 | Alternator, 70 amp | 1 | Alternator | buy |
| GM22171 | Spark plug | 6 | Spark plug | Amazon eBay |
| GM29608 | Sensor, coolant | 1 | Sensor | buy |
| GM72292 | Sensor, O2 | 1 | Sensor | buy |
| GM75153 | Retainer, 1 Wire Spark Plug | 6 | Spark plug | buy |
| GM75154 | Distributor, HVS Ignition | 1 | Spark plug | buy |
| GM75164 | Coil, Ignition HVS | 1 | Spark plug | buy |
| GM16117 | Dipstick, oil 4.3L | 1 | Service part / kit | buy |
| GM24341 | Fitting | 1 | Service part / kit | buy |
| GM29586 | Valve, throttle, 60 mm | 1 | Service part / kit | buy |
| GM29604 | Isolator, relay box | 2 | Service part / kit | buy |
| GM69492 | Tube, 0.625 ID x 3 in. | 1 | Service part / kit | buy |
| GM69516 | Washer, 3/8 | 2 | Service part / kit | buy |
| GM69517 | Bolt, 5/16-18 x 3/4 skt hd, gr. 5 | 4 | Service part / kit | buy |
| GM69524 | Bolt, M4 x .70 x 16 sht hd | 4 | Service part / kit | buy |
| GM69525 | Stud, M6 x 1.0 x 30 | 4 | Service part / kit | buy |
| GM69526 | Nut, M6 hex, flanged | 4 | Service part / kit | buy |
| GM72311 | Bolt, M8-1.25 x 20 hxhd gr 8.8 | 4 | Service part / kit | buy |
| GM72312 | Nut, M8-1.25 flange serrated | 1 | Service part / kit | buy |
| GM72321 | Bolt, M8-1.25 x 20 flange head | 2 | Service part / kit | buy |
| GM72584 | EPR assembly (dual fuel) | 1 | Service part / kit | buy |
| GM75103 | Nut, Flange 1/4-20 Serrated | 2 | Service part / kit | buy |
| GM75129 | Tube, Dipstick | 1 | Service part / kit | buy |
| GM75138 | Harness Stationary, IEPR | 1 | Service part / kit | buy |
| GM75144 | Bracket, Lifting Eye | 1 | Service part / kit | buy |
| GM75160 | Loom, Split 1/4” 46 in. | 1 | Service part / kit | buy |
| GM75161 | Yoke, HVS Dist Alignment | 1 | Service part / kit | buy |
| GM75163 | Bracket, Ignition coil | 1 | Service part / kit | buy |
| GM75220 | Oil Pressure Fitting | 1 | Service part / kit | buy |
| GM75221 | Clamp, Dipstick | 1 | Service part / kit | buy |
| GM75618 | Adapter, EPR, 3/4 NPT | 1 | Service part / kit | buy |
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
BrochureSpec sheetReferenceParts manualWiring diagram