Service parts for the 50RZG
Grouped by system, with how many of each the parts manual calls for.
Prices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.
Specifications
| Fuel | Natural Gas |
|---|---|
| Frequency | 60.0 Hz |
| Standby power | 55 kW |
| Standby kVA | 69 |
| Prime power | 50 kW |
| Controller | Decision-Maker 550 |
| Oil capacity | 4.7 L |
| Alternator | 4P8 |
| Coolant capacity | 20.1 L |
| Engine jacket water | 6.8 L |
Engine
| Oil capacity | 4.7 L |
|---|---|
| Coolant capacity | 17.0 L |
| Displacement | 5.0 L |
| Aspiration | natural |
| Rated speed | 1800 rpm |
Same engine, other brands
1 brandThe General Motors Industrial Powertrain Vortec 5.0 L in this set also powers 1 generator set sold under 1 other brand. Service parts and maintenance intervals for the engine are shared; enclosure, alternator, controller and ratings are not.
| Brand | Models |
|---|---|
| SDMO | G50 |
Maintenance & consumables
for the General Motors Industrial Powertrain Vortec 5.0 L| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Oil filter | Cartridge | GM16703 | Amazon eBay $58.00 NAPA $3.59 | ||
| Coolant | 20.8 L | — | |||
| Oil | 6.2 L | — |
Common questions
How many kW is the Kohler 50RZG?
The Kohler 50RZG is rated 55 kW standby (69.0 kVA).
Which engine powers the Kohler 50RZG?
The Kohler 50RZG is powered by the General Motors Industrial Powertrain Vortec 5.0 L engine.
What kind of fuel does the Kohler 50RZG run on?
The Kohler 50RZG runs on Natural Gas.
How much oil does the Kohler 50RZG take?
The General Motors Industrial Powertrain Vortec 5.0 L engine in the Kohler 50RZG has an oil capacity of 4.7 liters.
How much coolant does the Kohler 50RZG hold?
The Kohler 50RZG cooling system holds 20.1 liters (5.3 US gallons) for the radiator system including the engine, per the manufacturer specification sheet.
What is the prime power rating of the Kohler 50RZG?
The Kohler 50RZG is rated 50 kW prime (63 kVA), against 55 kW standby.
Which alternator is fitted to the Kohler 50RZG?
The Kohler 50RZG uses a 4P8 alternator.
What oil filter does the Kohler 50RZG use?
The Kohler 50RZG uses oil filter part number GM16703.
Parts
64| Part # | Description | Qty | System | |
|---|---|---|---|---|
| A--273699 | Air Cleaner Element | 1 | Air filter | Amazon Amazon eBay eBay |
| A-253104 | Air cleaner assembly | 1 | Air filter | Amazon Amazon eBay eBay |
| GM103656 | Hose, coolant SAE J20R2--DI 5/8 in. ID | 1 | Hose | eBay $23.00 |
| GM16132 | Belt, fan standard | 1 | Belt | Amazon eBay $86.00 |
| GM16133 | Gasket, intake manifold | 1 | Gasket | eBay |
| GM16140 | Cap, Bypass 5/8” (includes cap, connector, hose, clamps) | 1 | Hose | eBay |
| GM16180 | Alternator, 70 amp | 1 | Alternator | eBay |
| GM16199 | Gasket, manifold exhaust | 2 | Gasket | eBay |
| GM16202 | Gasket, intake manifold | 1 | Gasket | eBay |
| GM16348 | Gasket, valve rocker arm cover | 2 | Gasket | eBay |
| GM16362 | Gasket, oil pan | 1 | Gasket | eBay |
| GM16385 | Seal, intake valve stem oil | 6 | Seal | Amazon eBay |
| GM16474 | Seal, crankshaft rear oil | 1 | Seal | eBay |
| GM16482 | Pump, oil (.742 dia. Tube) | 1 | Pump | Amazon eBay |
| GM16483 | Gasket, water pump cover | 1 | Gasket | Amazon eBay |
| GM16496 | Seal, exh vlv stem Oil | 6 | Seal | Amazon eBay |
| GM16536 | Gasket, thermostat cover | 1 | Gasket | Amazon eBay |
| GM16582 | Gasket, water pump | 1 | Gasket | Amazon eBay |
| GM16703 | Filter, oil | 1 | Oil filter | Amazon eBay $58.00 NAPA $3.59 |
| GM22171 | Spark plug | 8 | Spark plug | Amazon eBay |
| GM38981 | Gasket, crankshaft rear oil seal housing | 1 | Gasket | eBay |
| GM39227 | Sensor, 1 bar TMAP | 1 | Sensor | eBay |
| GM39601 | Sensor, coolant | 1 | Sensor | eBay |
| GM42579 | Hose, fuel 3/8 in. 14.5 in. | 1 | Hose | eBay |
| GM60238 | Gasket, Man Adapter Venturi | 1 | Gasket | Amazon eBay |
| GM69504 | O-ring | 1 | Seal | eBay |
| GM72292 | Sensor, O2 | 1 | Sensor | Amazon eBay |
| GM72303 | Sender, oil pressure | 1 | Sender | Amazon eBay |
| GM75023 | Seal, crankshaft pos. sensor | 1 | Seal | Amazon eBay |
| GM75083 | Sensor, crishf posn | 1 | Sensor | eBay |
| GM75088 | Seal, oil pan drn plug(o ring) | 1 | Seal | eBay |
| GM75100 | Gasket, cyl hd | 1 | Gasket | eBay |
| GM75133 | Hose, WP to Int Man | 1 | Hose | eBay |
| GM75159 | Wires, Spark Plug | 1 | Spark plug | eBay |
| GM75222 | Pump kit, wat, (incls plug, seal, cover, gasket) | 1 | Pump | eBay |
| GM79552 | Radiator | Radiator | Amazon eBay | |
| GM79585-S | Thermostat, Service Kit (includes gasket) | 1 | Thermostat | Amazon eBay eBay |
| GM85017 | Belt, Alt | 1 | Belt | Amazon eBay $52.00 |
| GM90538 | Camshaft Position Sensor | 1 | Sensor | Amazon eBay $154.89 |
| GM90969-KP1-QS | 3" Concrete Mounting Pad (only comes in quantities of 5) | Physical | Amazon eBay | |
| GM90969-KP2-QS | 4" Concrete Mounting Pad (only comes in quantities of 5) | Physical | Amazon eBay | |
| GM92228-KP1-QS | 3" Concrete Mounting Pad (only comes in quantities of 5) | Physical | Amazon eBay | |
| GM92228-KP2-QS | 4" Concrete Mounting Pad (only comes in quantities of 5) | Physical | Amazon eBay | |
| X-312-47 | Hose (0.63 in. ID x 36 in.) | 1 | Hose | eBay |
| X-391-19 | Connector, 90 degrees (5/8 in. ID hose) | 1 | Hose | eBay $30.00 |
| X-582-1 | Connector, hose | 1 | Hose | Amazon eBay $22.00 |
| X-6014-137 | Hose, Radiator Wire Insert, 3 in. ID | 1 | Hose | Amazon eBay |
| 352945 | Block heater (kit GM78529-KP1-QS) | 1 | Service part / kit | eBay FridayParts $69.99 |
| 352946 | Block heater (kit GM78529-KP2) | 1 | Service part / kit | eBay |
| GM16159 | Valve, PCV | 1 | Service part / kit | Amazon eBay |
| GM17809 | Shield, heat (32 mm ID x 152 mm) | 1 | Service part / kit | eBay $9.00 |
| GM23718 | Shield, heat (32 mm ID x 455 mm) | 1 | Service part / kit | eBay |
| GM29586 | Valve, throttle, 60 mm | 1 | Service part / kit | Amazon eBay |
| GM62348-SKP1-QS | Maintenance Kit | 1 | Service part / kit | Amazon eBay |
| GM69494 | EPR assembly (5.0 L) | 1 | Service part / kit | eBay |
| GM69500 | Mixer | 1 | Service part / kit | eBay |
| GM72585 | EPR assembly (5.0 L, dual fuel) | 1 | Service part / kit | eBay |
| GM75155 | Distributor HVS (includes item 10) | 1 | Service part / kit | eBay |
| GM75164 | Coil, Ignition | 1 | Service part / kit | eBay |
| GM83718 | Maintenance Service Kit | 1 | Service part / kit | Amazon eBay |
| GM83718-SKP1-QS | Maintenance Kit | 1 | Service part / kit | Amazon eBay |
| GM86771-SKP1-QS | Maintenance Kit | 1 | Service part / kit | Amazon eBay |
| GM89979-SKP1-QS | Maintenance Kit | 1 | Service part / kit | Amazon eBay |
| GM93396-SKP1-QS | Maintenance Kit | 1 | 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 | 25% | 255.0 | 67.36 |
| Prime | 50% | 362.4 | 95.74 |
| Prime | 75% | 470.0 | 124.16 |
| Prime | 100% | 560.7 | 148.12 |
| Standby | 25% | 266.2 | 70.32 |
| Standby | 50% | 388.0 | 102.5 |
| Standby | 75% | 506.9 | 133.91 |
| Standby | 100% | 596.9 | 157.68 |
Available documents
This page was generated from the 3 manufacturer documents above by automated extraction; every figure shown is copied from one of them. How the data is compiled.