Service parts for the 100REZG
Grouped by system, with how many of each the parts manual calls for.
Oil system
1 requiredBelts
1 requiredIgnition
1 required2.270Spark plugfind
Prices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.
Specifications
| Fuel | Natural Gas, LP Gas, or Dual Fuel |
|---|---|
| Frequency | 50.0 Hz |
| Standby power | 80 kW |
| Standby kVA | 80 |
| Controller | 6000, Decision-Maker 550 |
| Oil capacity | 10.0 L |
| Alternator | 4S9 |
| Voltage options | 480 V |
| Max ambient | 50 °C |
| Sound level | 71.0 dBA @ 23 m |
Engine
| Oil capacity | 10.0 L |
|---|---|
| Coolant capacity | 10.0 L |
| Displacement | 8.1 L |
| Aspiration | Natural Aspiration |
| Rated speed | 1500 rpm |
Maintenance & consumables
for the General Motors 8.1L| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | — | 500 hr | |||
| Fuel filter | — | 1000 hr | |||
| Oil filter | GM16703 | Amazon $9.06 eBay $58.00 | |||
| Battery | — | ||||
| Belt | Drive Belt Tensioner | 374176 | Amazon eBay | ||
| Coolant | 29.9 liters | — | 1000 hr | ||
| Coolant filter | — | ||||
| Oil | 7.1 liters | — | 250 hr | ||
| Spark plug | Replace spark plugs | 2.270 | 10000 hr | buy |
Service specifications
30| Type | Item | Value | Unit | Condition |
|---|---|---|---|---|
| Other | 10 in. weld flange bolt circle diameter B | 361.95 | mm (14.25 in.) | |
| Other | 10 in. weld flange outside diameter C | 406.4 | mm (16.0 in.) | |
| Other | 10 in. weld flange quantity of bolts / bolt hole diameter D | 12, 25.40 | mm (1.00 in.) | |
| Other | 12 in. weld flange bolt circle diameter B | 431.80 | mm (17.00 in.) | |
| Other | 12 in. weld flange outside diameter C | 482.6 | mm (19.0 in.) | |
| Other | 12 in. weld flange quantity of bolts / bolt hole diameter D | 12, 25.40 | mm (1.00 in.) | |
| Other | 14 in. weld flange bolt circle diameter B | 476.25 | mm (18.75 in.) | |
| Other | 14 in. weld flange outside diameter C | 533.4 | mm (21.0 in.) | |
| Other | 14 in. weld flange quantity of bolts / bolt hole diameter D | 12, 28.58 | mm (1.13 in.) | |
| Other | 16 in. weld flange bolt circle diameter B | 539.75 | mm (21.25 in.) | |
| Other | 16 in. weld flange outside diameter C | 596.9 | mm (23.5 in.) | |
| Other | 16 in. weld flange quantity of bolts / bolt hole diameter D | 16, 28.58 | mm (1.13 in.) | |
| Other | 18 in. weld flange bolt circle diameter B | 577.85 | mm (22.75 in.) | |
| Other | 18 in. weld flange outside diameter C | 635.0 | mm (25.0 in.) | |
| Other | 18 in. weld flange quantity of bolts / bolt hole diameter D | 16, 31.75 | mm (1.25 in.) | |
| Other | 20 in. weld flange bolt circle diameter B | 635.00 | mm (25.00 in.) | |
| Other | 20 in. weld flange outside diameter C | 698.5 | mm (27.5 in.) | |
| Other | 20 in. weld flange quantity of bolts / bolt hole diameter D | 20, 31.75 | mm (1.25 in.) | |
| Other | 5 in. weld flange bolt circle diameter B | 215.90 | mm (8.50 in.) | |
| Other | 5 in. weld flange outside diameter C | 241.30 | mm (9.50 in.) | |
| Other | 5 in. weld flange quantity of bolts / bolt hole diameter D | 8, 22.23 | mm (0.88 in.) | |
| Other | 6 in. weld flange bolt circle diameter B | 254.0 | mm (10.0 in.) | |
| Other | 6 in. weld flange outside diameter C | 279.4 | mm (11.0 in.) | |
| Other | 6 in. weld flange quantity of bolts / bolt hole diameter D | 8, 22.23 | mm (0.88 in.) | |
| Other | 8 in. weld flange bolt circle diameter B | 298.45 | mm (11.75 in.) | |
| Other | 8 in. weld flange outside diameter C | 342.9 | mm (13.5 in.) | |
| Other | 8 in. weld flange quantity of bolts / bolt hole diameter D | 8, 22.23 | mm (0.88 in.) | |
| Other | Weld flange angle A (10, 12, 14 in. nominal pipe size) | 30 | deg. | |
| Other | Weld flange angle A (16, 18, 20 in. nominal pipe size) | 22.5 | deg. | |
| Other | Weld flange angle A (5, 6, 8 in. nominal pipe size) | 45 | deg. |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Voltage reconnection
| Voltage | Phase | Connection | Leads | Notes |
|---|---|---|---|---|
| 12-Lead | Alternator Reconnections diagram ADV-5875B-M (page 16) | |||
| 4-Lead | Alternator Reconnections diagram ADV-5875A-M (page 15) |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Common questions
How many kW is the Kohler 100REZG?
The Kohler 100REZG is rated 80 kW standby (80.0 kVA).
What engine does the Kohler 100REZG use?
The Kohler 100REZG is powered by the General Motors 8.1L engine.
What kind of fuel does the Kohler 100REZG run on?
The Kohler 100REZG runs on Natural Gas, LP Gas, or Dual Fuel.
How much oil does the Kohler 100REZG take?
The General Motors 8.1L engine in the Kohler 100REZG has an oil capacity of 10.0 liters.
What alternator comes on the Kohler 100REZG?
The Kohler 100REZG uses a 4S9 alternator.
Which oil filter part number does the Kohler 100REZG take?
The Kohler 100REZG uses oil filter part number GM16703.
Parts
50| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 1052367 | Engine Oil Supplement Lubricant | Fluid | Amazon eBay $19.95 | |
| 290090 | Switch, low water temperature | 1 | Sensor | Amazon eBay |
| 373133 | Clutch Pilot Bearing Removal Tools Required | Clutch pilot bearing removal tools required | Amazon eBay $84.66 | |
| 374176 | Drive Belt | Belt | Amazon eBay | |
| 375105 | Clutch Pilot Bearing Removal (C/K/C3500HD) | Clutch pilot bearing removal | Amazon eBay | |
| 470515 | Repair Instructions - Draining Fluids and Oil Filter Removal | Repair instructions | Amazon eBay $7.65 | |
| 470572 | Engine Flywheel Removal (C/K/C3500HD with AT MT1) | Engine flywheel removal | Amazon eBay | |
| 470576 | Engine Flywheel Removal (Medium Duty with MT) | Engine flywheel removal | Amazon eBay $110.99 | |
| 470599 | Engine Flywheel Housing Removal (Medium Duty with AT) | Engine flywheel housing removal | Amazon eBay | |
| 470627 | Clutch Pilot Bearing Removal (Medium Duty) | Clutch pilot bearing removal | Amazon eBay | |
| 470639 | Oil Level Indicator and Tube Removal (C/K/C3500HD) | Oil level indicator and tube removal | Amazon eBay $90.00 | |
| 470666 | Oil Level Indicator and Tube Removal (G) | Oil level indicator and tube removal | Amazon eBay | |
| 638592 | Flywheel Housing Adapter, Medium Duty with Manual Transmission | Flywheel housing adapter | Amazon eBay $695.00 | |
| 638596 | Cylinder Head and Components | Cylinder head and components | Amazon eBay | |
| 638602 | Intake Manifold and Components | Intake manifold and components | Amazon eBay $4840.00 | |
| 638608 | Engine Crankshaft and Components | Engine crankshaft and components | Amazon eBay | |
| 638616 | Lower Engine Block and Components | Lower engine block and components | Amazon eBay | |
| 640013 | Crankshaft Balancer Removal Tools Required | Crankshaft balancer removal tools required | Amazon eBay $12.99 | |
| 640014 | Crankshaft Balancer Removal Steps | Crankshaft balancer removal steps | Amazon eBay $11.08 | |
| 677764 | Engine Identification Number | Engine identification number | Amazon eBay $94.90 | |
| 677814 | Engine Flywheel Removal (C3500HD with AT M74) | Engine flywheel removal | Amazon eBay | |
| 679414 | Engine Flywheel Removal (C/K with MT) | Engine flywheel removal | Amazon eBay $19.58 | |
| 9985770 | MAP Sensor Seal Lubricant | Fluid | Amazon eBay | |
| GM16430 | Sealer, oil pan / Sealant, Loctite | Fluid | Amazon | |
| GM16576 | Seal, oil pan drain plug (part of item 63) | 1 | Seal | Amazon eBay |
| GM16703 | Filter, oil | 1 | Oil filter | Amazon $9.06 eBay $58.00 |
| GM18888 | Sealer, crankshaft rear main bearing | Fluid | Amazon | |
| GM18906 | Sensor, knock | 2 | Sensor | Amazon |
| GM18933 | Sealer, camshaft bearing hole plug | Fluid | Amazon | |
| GM18934 | Grease, heavy duty multipurpose | Fluid | Amazon | |
| GM18951 | Gasket, engine front cover, also part of 76 | 1 | Gasket | Amazon |
| GM18952 | Sensor, crankshaft position (includes 123) | 1 | Sensor | Amazon |
| GM18963 | Gasket, water pump | 2 | Gasket | Amazon |
| GM18964 | Gasket, engine coolant crossover | 2 | Gasket | Amazon |
| GM18967 | Hose, therm bypass includes hose clamps | 1 | Hose | Amazon |
| GM18971 | Seal, crankshaft rear oil | 1 | Seal | Amazon |
| GM18972 | Seal, crankshaft front oil | 1 | Seal | Amazon |
| GM18990 | Pump, oil with screen | 1 | Pump | Amazon |
| GM19004 | Sensor, camshaft position (2001 GM engines / GM model year 2003 and older) | 1 | Sensor | Amazon |
| GM19009 | Gasket, oil pan | 1 | Gasket | Amazon |
| GM19027 | Pump kit, water (incl. 31, 82, 83, 85, 105) | 1 | Pump | Amazon |
| GM24739 | Sensor, camshaft position (2002 and 2003 GM engines) | 1 | Sensor | Amazon |
| GM42165 | Thermostat, block heater 49C--60C (120F--140F) | 1 | Thermostat | Amazon |
| GM51539 | Sensor, camshaft position (2004-- GM engines) | 1 | Sensor | Amazon |
| GM75077 | Sensor, Cm/Shf Posn (GM model year 2004 and newer) | Sensor | Amazon | |
| NGE012014 | Radiator Fan Shroud Bolts | Bolt | Amazon eBay | |
| 1051396 | Engine Oil Supplement Lubricant | Service part / kit | Amazon eBay $19.95 | |
| 1052942 | Crankshaft Rear Bearing Cap Sealant | Service part / kit | Amazon eBay $9.99 | |
| 12377901 | Camshaft Rear Bearing Hole Plug Sealant | Service part / kit | Amazon eBay | |
| LG199 | Home Maintenance Kit | 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.
Available documents
Spec sheet (Kohler)Reference (Kohler)Reference — G6-39 0918AZ (Kohler)Service manual — sb735 (Kohler)Service manual — tp6712 (Kohler)