Service parts for the 50RZG
Grouped by system, with how many of each the parts manual calls for.
Oil system
1 requiredPrices 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 |
Engine
| Oil capacity | 4.7 L |
|---|---|
| Coolant capacity | 17.0 L |
| Displacement | 5.0 L |
| Aspiration | natural |
| Rated speed | 1800 rpm |
Maintenance & consumables
for the General Motors Industrial Powertrain Vortec 5.0 L| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Oil filter | Cartridge | GM16703 | Amazon $9.06 eBay $58.00 | ||
| 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.
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 (incl. items 38--43) | 1 | Pump | Amazon eBay |
| GM16483 | Gasket, water pump cover | 1 | Gasket | Amazon eBay |
| GM16496 | Seal, exhaust valve stem oil | 6 | Seal | Amazon eBay |
| GM16536 | Gasket, thermostat cover | 2 | Gasket | Amazon eBay |
| GM16582 | Gasket, water pump (part of item 31) | 1 | Gasket | Amazon eBay |
| GM16703 | Filter, oil | 1 | Oil filter | Amazon $9.06 eBay $58.00 |
| GM22171 | Spark plug | 8 | Oil filter | 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 | Sensor | 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 |
| GM83718 | Air Filter, Oil, qts. 5.0L GM83718 | 1 | Air filter | Amazon eBay |
| GM85017 | Belt, Alt | 1 | Belt | Amazon eBay $52.00 |
| GM90538 | Camshaft Position Sensor (part of item 1) | 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 (5/8 in. x 1/2 in. MIP brass) | 1 | Hose | Amazon eBay |
| X-6014-137 | Hose, 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 |
| 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-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
Spec sheet (Kohler)Service manual — tp6098 (Kohler)Service manual — tp6274 (Kohler)