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Kohler 45ERES Generator Set

The Kohler 45ERES is a 33 kW (41 kVA) LP Gas standby generator set powered by a General Motors Vortec 4.3L engine. It is available at 120/240 V, single-phase, 60 Hz and rated 188 A. It holds about 4.3 L (1.1 gal) of oil and 19.7 L (5.2 gal) of coolant. The set measures 101×42.4×53.7 mm (4.0×1.7×2.1 in) and produces 71 dBA at 23 m. The same Vortec 4.3L engine also powers generator sets from SDMO and Winco.

33 kW
Standby
4.3 L
Displacement
4.3 L
Oil capacity
4
Document types

How to read your Kohler serial & model number →

Compare with other 30–35 kW Propane/LPG generators →

Service parts for the 45ERES

Grouped by system, with how many of each the parts manual calls for.

Oil system

1 required

Belts

1 required

Ignition

1 required

Prices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.

Specifications

FuelLP Gas
Frequency60.0 Hz
Standby power33 kW
Standby kVA41
EmissionsEPA NSPS
ControllerDecision-Maker 3000
Oil capacity4.3 L
AlternatorFast-Response II (FRII)
Voltage options120/240 V
PhaseSingle
Rated current188/177 A
Coolant capacity19.7 L
Engine jacket water6.8 L
Dimensions (L×W×H)101×42×53 mm
Sound level71.0 dBA @ 23 ft m

Engine

General Motors Vortec 4.3L
Oil capacity4.3 L
Coolant capacity15.0 L
Displacement4.3 L
AspirationNatural Aspiration
Rated speed1800 rpm

Same engine, other brands

2 brands

The General Motors Vortec 4.3L in this set also powers 6 generator sets sold under 2 other brands. Service parts and maintenance intervals for the engine are shared; enclosure, alternator, controller and ratings are not.

BrandModels
WincoPSS40-17, PSS40-18, PSS40-3, PSS40-4
SDMOG 40, G45

Maintenance & consumables

for the General Motors Vortec 4.3L
ItemSpecCapacityPart #Interval
Air filterCheck for dirt or restriction—1000 hr
Fuel filterAs recommended by OEM—1000 hr
Oil filterFilter, oilGM28351 Amazon eBay $19.46 NAPA $9.09
Battery—1000 hr
BeltSerpentine belt system with spring-loaded tensionerGM16132 Amazon eBay $86.00
Coolant50/50 antifreeze and water mixture, DexCool Long Life type, min 300F boiling point, -34F freezing point6.8—1000 hr
Oil5.7 L—1000 hr
Spark plugSpark plugGM16531 Amazon eBay $8.08 NAPA $5.38

Service specifications

34
TypeItemValueUnitCondition
Torque1-12 fastener283.0 (209)Nm (ft. lb.)Assembled into cast iron or steel, Grade 2 or 5
Torque1-8 fastener259.0 (191)Nm (ft. lb.)Assembled into cast iron or steel, Grade 2 or 5
Torque1/2-13 fastener60.0 (44)Nm (ft. lb.)Assembled into cast iron or steel, Grade 2 or 5
Torque1/2-20 fastener66.0 (49)Nm (ft. lb.)Assembled into cast iron or steel, Grade 2 or 5
Torque1/4-20 fastener6.8 (60)Nm (in. lb.)Assembled into cast iron or steel, Grade 2 or 5
Torque1/4-28 fastener8.1 (72)Nm (in. lb.)Assembled into cast iron or steel, Grade 2 or 5
Torque10-24 fastener2.9 (26)Nm (in. lb.)Assembled into cast iron or steel, Grade 2 or 5
Torque10-32 fastener2.9 (26)Nm (in. lb.)Assembled into cast iron or steel, Grade 2 or 5
Torque3/4-10 fastener199.0 (147)Nm (ft. lb.)Assembled into cast iron or steel, Grade 2 or 5
Torque3/4-16 fastener222.0 (164)Nm (ft. lb.)Assembled into cast iron or steel, Grade 2 or 5
Torque3/8-16 fastener24.0 (18)Nm (ft. lb.)Assembled into cast iron or steel, Grade 2 or 5
Torque3/8-24 fastener27.0 (20)Nm (ft. lb.)Assembled into cast iron or steel, Grade 2 or 5
Torque5/16-18 fastener13.6 (120)Nm (in. lb.)Assembled into cast iron or steel, Grade 2 or 5
Torque5/16-24 fastener14.9 (132)Nm (in. lb.)Assembled into cast iron or steel, Grade 2 or 5
Torque5/8-11 fastener113.0 (83)Nm (ft. lb.)Assembled into cast iron or steel, Grade 2 or 5
Torque5/8-18 fastener128.0 (94)Nm (ft. lb.)Assembled into cast iron or steel, Grade 2 or 5
Torque7/16-14 fastener39.0 (29)Nm (ft. lb.)Assembled into cast iron or steel, Grade 2 or 5
Torque7/16-20 fastener43.0 (32)Nm (ft. lb.)Assembled into cast iron or steel, Grade 2 or 5
Torque8-32 fastener1.8 (16)Nm (in. lb.)Assembled into cast iron or steel, Grade 2 or 5
Torque9/16-12 fastener81.0 (60)Nm (ft. lb.)Assembled into cast iron or steel, Grade 2 or 5
Torque9/16-18 fastener91.0 (67)Nm (ft. lb.)Assembled into cast iron or steel, Grade 2 or 5
TorqueM10 x 1.25 fastener31.0 (23)Nm (ft. lb.)Assembled into cast iron or steel, Grade 5.8 or 8.8
TorqueM10 x 1.50 fastener30.0 (22)Nm (ft. lb.)Assembled into cast iron or steel, Grade 5.8 or 8.8
TorqueM12 x 1.50 fastener56.0 (41)Nm (ft. lb.)Assembled into cast iron or steel, Grade 5.8 or 8.8
TorqueM12 x 1.75 fastener53.0 (39)Nm (ft. lb.)Assembled into cast iron or steel, Grade 5.8 or 8.8
TorqueM14 x 1.50 fastener87.0 (64)Nm (ft. lb.)Assembled into cast iron or steel, Grade 5.8 or 8.8
TorqueM14 x 2.00 fastener83.0 (61)Nm (ft. lb.)Assembled into cast iron or steel, Grade 5.8 or 8.8
TorqueM16 x 1.50 fastener132.0 (97)Nm (ft. lb.)Assembled into cast iron or steel, Grade 5.8 or 8.8
TorqueM16 x 2.00 fastener127.0 (94)Nm (ft. lb.)Assembled into cast iron or steel, Grade 5.8 or 8.8
TorqueM18 x 1.50 fastener189.0 (140)Nm (ft. lb.)Assembled into cast iron or steel, Grade 5.8 or 8.8
TorqueM18 x 2.50 fastener179.0 (132)Nm (ft. lb.)Assembled into cast iron or steel, Grade 5.8 or 8.8
TorqueM6 x 1.00 fastener6.2 (4.6)Nm (ft. lb.)Assembled into cast iron or steel, Grade 5.8 or 8.8
TorqueM8 x 1.00 fastener16.0 (11)Nm (ft. lb.)Assembled into cast iron or steel, Grade 5.8 or 8.8
TorqueM8 x 1.25 fastener15.0 (11)Nm (ft. lb.)Assembled into cast iron or steel, Grade 5.8 or 8.8

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Procedures

2
Common Hardware Application installation
  1. Determine entry hole type: round or slotted.
  2. Determine exit hole type: fixed female thread (weld nut), round, or slotted.
  3. For round and slotted exit holes, determine if hardware is greater than 1/2 inch in diameter.
  4. Hardware greater than 1/2 inch in diameter uses a standard nut and SAE washer.
  5. Hardware 1/2 inch or less in diameter can use a properly torqued whiz nut or spiralock nut.
  6. Always use a washer between hardware and a slot.
  7. Always use a washer under a nut.
  8. Use a washer under a bolt when the female thread is fixed (weld nut).
How to Find Part Numbers operation
  1. Locate the generator set nameplate to identify the generator set spec number.
  2. Locate the second nameplate listing accessories to identify installed modules; on some models it is inside the junction box.
  3. Turn to the Specification Number Index; the first column lists generator set spec numbers.
  4. Identify the group most likely to include the service part number.
  5. Find the group variation number at the intersection of the spec number row and group column.
  6. Page forward to locate that group or find the page in the Table of Contents.
  7. Find the part on the illustration and note the item number, or find the part description in the parts list.
  8. Select the part number that corresponds to your group variation using the column on the right side of the parts list table.

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

VoltagePhaseConnectionLeadsNotes
Alternator Reconnection drawing ADV-5875U--144--Lead

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 45ERES?

The Kohler 45ERES is rated 33 kW standby (41.0 kVA).

Which engine powers the Kohler 45ERES?

The Kohler 45ERES is powered by the General Motors Vortec 4.3L engine.

What fuel type does the Kohler 45ERES take?

The Kohler 45ERES runs on LP Gas.

How much oil does the Kohler 45ERES take?

The General Motors Vortec 4.3L engine in the Kohler 45ERES has an oil capacity of 4.3 liters.

What is the cooling system capacity of the Kohler 45ERES?

The Kohler 45ERES cooling system holds 19.7 liters (5.2 US gallons) for the radiator system including the engine, per the manufacturer specification sheet.

How loud is the Kohler 45ERES?

The Kohler 45ERES is rated at 71.0 dBA at 23 ft m, per the manufacturer specification sheet.

What voltage does the Kohler 45ERES produce?

The Kohler 45ERES is offered in 120/240 V, Single-phase.

What alternator comes on the Kohler 45ERES?

The Kohler 45ERES uses a Fast-Response II (FRII) alternator.

What oil filter does the Kohler 45ERES use?

The Kohler 45ERES uses oil filter part number GM28351.

Parts

170
Part #DescriptionQtySystem
035685CLAMP HOSE #28 1.32-2.252Hose Amazon eBay
047290HOSE 3/8 ID SINGLE BRAID (16” LG)1Hose Amazon eBay $10.00
050967HOSE 5/8 ID DIA 250F (24" LG)1Hose Amazon eBay
052865GASKET CARBURETOR1Gasket Amazon eBay
057422HOSE 1IN ID LP GAS1Hose Amazon eBay
057822CLAMP HOSE #8 .53-1.002Hose Amazon eBay
057824CLAMP HOSE #16 .87 - 1.501Hose Amazon eBay
064945GASKET CARB ADAPTOR1Gasket Amazon eBay
067680ASSY VOLTAGE REGULATOR 60HZ1Avr Amazon eBay $245.48 NAPA $19.32
080723HOSE CONNECTION TEE 1.75-.621Hose Amazon eBay
0A4632AHOSE 1IN ID LP GAS (NATURAL GAS + VAPOR) (42")1Air filter Amazon eBay
0A4637Air Cleaner1Air filter Amazon eBay $49.95 NAPA $13.61
0A5763CLAMP HOSE #16 .87 - 1.501Hose Amazon eBay
0A6613GASKET CARB IMPCO 2251Gasket Amazon eBay
0C7060GASKET CARBURETOR ADAPTOR1Gasket Amazon eBay
253107Element, Air Cleaner1Air filter Amazon eBay $69.00 NAPA $55.23
276206Hose, molded1Hose Amazon eBay
A--253104Air Cleaner Element1Air filter Amazon Amazon eBay eBay
A-273699Air Cleaner Assembly1Air filter Amazon Amazon eBay eBay
GM16113Sensor, mag. speed 5/8-181Sensor Amazon eBay
GM16132Belt, fan standard1Belt Amazon eBay $86.00
GM16150Gasket, carburetor1Gasket Amazon eBay
GM16156Wires, spark plug1Spark plug Amazon eBay
GM16158Hose, PCV, 3/8” (37 in.)1Hose Amazon eBay
GM16178Starter1Starter Amazon eBay
GM16215Seal, exhaust2Seal Amazon eBay
GM16360Gasket, distributor1Gasket Amazon eBay
GM16366Seal, crankshaft front oil1Seal Amazon eBay
GM16383Gasket, valve rocker arm cover2Gasket Amazon eBay
GM16385Seal, intake valve stem oil6Seal Amazon eBay
GM16390Gasket, oil pan (year 2007 and earlier)1Gasket Amazon eBay
GM16436Gasket kit, cylinder head (qty AR)Gasket Amazon eBay
GM16440Pump kit, water (w/gasket)1Pump Amazon eBay
GM16448Gasket kit, intake manifold (includes 2 gaskets)1Gasket Amazon eBay
GM16465Gasket, cylinder head2Gasket Amazon eBay
GM16479Hose, water pump inlet (includes clamps)1Hose Amazon eBay
GM16482Pump, oil (.742 dia. Tube)1Pump Amazon eBay
GM16483Gasket, water pump cover1Gasket Amazon eBay
GM16487Gasket, crankshaft rear oil seal housing1Gasket Amazon eBay
GM16489Seal, crankshaft rear oil (part of item 61)1Seal Amazon eBay
GM16496Seal, exh vlv stem Oil6Seal Amazon eBay
GM16531Spark plug1Spark plug Amazon eBay $8.08 NAPA $5.38
GM16536Gasket, thermostat cover1Gasket Amazon eBay
GM16537Thermostat, 160 degree1Oil filter Amazon eBay $22.50
GM16576Seal, oil pan drain plug1Seal Amazon eBay
GM16582Gasket, water pump1Gasket Amazon eBay
GM17380Gasket, manifold (fuel system)1Gasket Amazon eBay
GM17386Gasket, mixer to air horn1Gasket Amazon eBay
GM17392Gasket, throttle body to mixer1Gasket Amazon eBay
GM24335Hose, water 5/8 ID x 6.88 in., 250 PSI1Hose Amazon eBay
GM28351Filter, oil1Oil filter Amazon eBay $19.46 NAPA $9.09
GM28766Gasket, LC-50 valve1Gasket Amazon eBay
GM29846Hose, 5/8 LP vapor w/wire reinforce x 15 in.1Hose Amazon eBay
GM29852Hose, elbow 5/8 in. ID1Hose Amazon eBay
GM39221Hose, rubber 2 in. ID1Hose Amazon eBay
GM60238Gasket, Man Adapter Venturi1Gasket Amazon eBay
GM60247Sender, temp. unit E-controls1Sensor Amazon eBay
GM75023Seal, crankshaft pos. sensor1Seal Amazon eBay
GM75080Gasket, oil pan (year 2008 and newer)1Gasket Amazon eBay
GM75082Sensor, crankshaft1Sensor Amazon eBay
GM75179Gasket, Exh Manifold (single)2Gasket Amazon eBay
GM75180Gasket, Exh Manifold (dual)2Gasket Amazon eBay
GM79552RadiatorRadiator Amazon eBay
GM82861Hose, Intake1Hose Amazon eBay
GM82862Bracket, Air Cleaner1Air filter Amazon eBay
GM85017Belt, Alt1Belt Amazon eBay $52.00
GM90280Air Cleaner Assy1Air filter Amazon eBay
X-312-53Hose (0.63 in. ID x 24 in.)1Hose eBay
X-391-19Connector, 90 degrees (5/8 in. ID hose)1Hose eBay $30.00
X-426-5Clamp, hose, 3.56/4.5 in.2Hose Amazon eBay
X-504-22Fuel line, flexible (1.50"id x 28.25") - correct partHose Amazon eBay
X-582-1Connector, hose1Hose Amazon eBay $22.00
022129WASHER LOCK M8-5/164Service part / kit Amazon eBay
022132SCREW HHC #10-24 X 3/4 YC2Service part / kit Amazon eBay
022145WASHER FLAT 5/16-M8 ZINC1Service part / kit Amazon eBay $10.66
022152WASHER LOCK #101Service part / kit Amazon eBay $12.00
022155WASHER LOCK #66Service part / kit Amazon eBay
022158NUT HEX #10-32 STEEL5Service part / kit Amazon eBay
022188NUT HEX #6-32 STEEL6Service part / kit Amazon eBay
022259NUT HEX 5/16-18 STEEL2Service part / kit Amazon eBay
022507WASHER LOCK #102Service part / kit Amazon eBay
022676FUSE AGC-15A.1Service part / kit Amazon eBay $3.99
023762SHAKEPROOF EXT. #101Service part / kit Amazon eBay
023897WASHER FLAT #10 ZINC4Service part / kit Amazon eBay
026307STREET ELBOWS3Service part / kit Amazon eBay
026490NIPPLE PIPE 3/4NPT X 21Service part / kit Amazon eBay
026577NIPPLE PIPE 3/4 NPT X 22Service part / kit Amazon eBay
027482WASHER SHAKEPROOF EXT 5/16 STL1Service part / kit Amazon eBay
027744SWITCH ROCKER DPST 125V SPD51Service part / kit Amazon eBay
028641NIPPLE TOE 3/4 NPT X 21Service part / kit Amazon eBay
029333TFMR ASM,CMA 240/12V67Service part / kit Amazon eBay
030468WASHER STEP NYLON .201Service part / kit Amazon eBay
032300FUSE HOLDER1Service part / kit Amazon eBay
033212SCREW HHC 5/16-18 X 1-1/4 G54Service part / kit Amazon eBay
036409NUT HEX 1/4-28 STEEL1Service part / kit Amazon eBay
036902DECAL, TERM. STRIP69Service part / kit Amazon eBay
036908PLATE CSA NOT FOR RESALE71Service part / kit Amazon eBay
037561NUT WING 1/4-20 NYLK1Service part / kit Amazon eBay
040213GROMMET 3/4 X 5/82 X 5/1650Service part / kit Amazon eBay
043123WASHER LOCK M144Service part / kit Amazon eBay
048476NUT, HDP DEUTSCH37Service part / kit Amazon eBay
048766BLOCK TERM 20A 2 X 6 X 1100VREFService part / kit Amazon eBay
049939RECTIFIER MSC 12A 600V1Service part / kit Amazon eBay
051778WASHER FLAT 9/16 ZINC2Service part / kit Amazon eBay
051779NUT HEX M14-2.0 G8 YEL CHR4Service part / kit Amazon eBay
055444HEATSINK42Service part / kit Amazon eBay
055934ZCLAMP VINYL 1.13 X .406 Z1Service part / kit Amazon eBay
055944BUSHING REDUCER 1 TO 3/41Service part / kit Amazon eBay
057335BLOCK TERM 20A 20 X 6 X 1100V1Service part / kit Amazon eBay
057795CONNECTOR C/C VENT1Service part / kit Amazon eBay
057796GROMMET1Service part / kit Amazon eBay
057907CIRCT BRK 4.5X1 AUTSOKW CNT45K RES WW LUG 10R 10% 25W39Service part / kit Amazon eBay
058359LUG RNGTNG INS 22-18 X 5/16 X .4771Service part / kit Amazon eBay
061391BLOCK TERM 20A 20 X 6 X 1100V68Service part / kit Amazon eBay
061945VOLTMETER DC 8-18V1Service part / kit Amazon eBay
062522STUD TH 1/4-20 X 3 G2 ZNC FULL1Service part / kit Amazon eBay
064008COVER CON PNL TOP (NOT SHOWN)44Service part / kit Amazon eBay
064009SWITCH SELECTOR 6A AMP/V56Service part / kit Amazon eBay
064090SCREW PHM SEMS #12-24 X 5/8 EX4Service part / kit Amazon eBay
065907SUPPORT SOLENOID NAT GAS1Service part / kit Amazon eBay
067018REGULATOR NAT GAS LPG VAPOR1Service part / kit Amazon eBay
070043AMMETER AC 0-20060Service part / kit Amazon eBay
070084VOLTMETER AC 0-30059Service part / kit Amazon eBay
070370WASHER MICA .2031Service part / kit Amazon eBay
076009APCB SUPPORT SNAP-IN 1/4"1Service part / kit Amazon eBay
076020HOLDER FUSE53Service part / kit Amazon eBay
076037HOURMETER58Service part / kit Amazon eBay
076061BLOCK TERM 20A 2 X 6 X 1100V66Service part / kit Amazon eBay
076691NIPPLE PIPE 3/4 NPT X 4.5 BLK IRN1Service part / kit Amazon eBay
080069PADDLE HANDLE LOCK76Service part / kit Amazon eBay
082573SWITCH RKR DPST 125V SPD1Service part / kit Amazon eBay
083264ASSY L.C. ELECT GOV64Service part / kit Amazon eBay
084918CHEATER, ENGINE 1800W 120V.1Service part / kit Amazon eBay FridayParts $110.00
084918DHEATER, ENGINE 2000W 240V.1Service part / kit Amazon eBay
087233RIVET POP .1875 X .450 SS2Service part / kit Amazon eBay
098647FREQUENCY METER 240V 55-65HZ61Service part / kit Amazon eBay
0A4120ADAPTOR CARBURETOR W/INLET1Service part / kit Amazon eBay
0A4121VALVE PCV1Service part / kit Amazon eBay
0A4632BACTUATOR THROTTLE 42MM1Service part / kit Amazon eBay
0A6344BARBED EL 90 1/8 NPT X 3/81Service part / kit Amazon eBay
0AS968DECAL EXERCISE INFO62Service part / kit Amazon eBay
0C2212SCREW PHTT M4-0.7 X 16 ZYC8Service part / kit Amazon eBay
0C2775SUPPORT REGULATOR1Service part / kit Amazon eBay
0C3168WASHER LOCK SPECIAL 5/161Service part / kit Amazon eBay
0C7059CARB. REWORK 4.3L (NATURAL GAS + VAPOR)1Service part / kit Amazon eBay
0C7908SCREW SHC #10-32 X 5/8 G8.8 NZ4Service part / kit Amazon eBay
0C8243ASSY VOLTAGE REGULATOR 60HZ1Service part / kit Amazon eBay
0D1509DECAL INLET PRESSURE1Service part / kit Amazon eBay
0D1521ACONTROL PANEL, FRONT W/ SILK SCREEN32Service part / kit Amazon eBay
0D1522PANEL,SIDE COVER33Service part / kit Amazon eBay
0D1523PANEL BTM & BACK CONTROL PANEL34Service part / kit Amazon eBay
326228Block Heater1Service part / kit Amazon eBay NAPA $75.00
326229Block Heater1Service part / kit Amazon eBay
326232Installed Block Heater Kit (120V)Service part / kit Amazon eBay
326233Installed Block Heater Kit (240V)Service part / kit Amazon eBay
358311Block heater (kit GM84997-KP1-QS)1Service part / kit eBay
358327Block heater (kit GM84997-KP2)1Service part / kit Amazon eBay
GM16160Valve, PCV1Service part / kit Amazon eBay
GM17383Diaphragm, silicone (nat. gas or LP) - mixer1Service part / kit Amazon eBay
GM17809Shield, heat (32 mm ID x 152 mm)1Service part / kit eBay $9.00
GM23718Shield, heat (32 mm ID x 455 mm)1Service part / kit eBay
GM62348-SKP1-QSMaintenance Kit1Service part / kit Amazon eBay
GM82973Mounting Bracket1Service part / kit Amazon eBay
GM83718-SKP1-QSMaintenance Kit1Service part / kit Amazon eBay
GM86771Maintenance Service Kit1Service part / kit Amazon eBay
GM86771-SKP1-QSMaintenance Kit1Service part / kit Amazon eBay
GM89979-SKP1-QSMaintenance Kit1Service part / kit Amazon eBay
GM93396-SKP1-QSMaintenance Kit1Service part / kit Amazon eBay
M6923-06-80Nut, Hex 6mm2Service part / kit Amazon eBay $8.80 eBay
M933-06016-60Screw, hex cap2Service 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

RatingLoadL/hgal/h
Standby25%21.85.76
Standby50%28.97.63
Standby75%39.110.33
Standby100%46.712.34

Available documents

Spec sheet (Kohler)Reference (Kohler)Parts manual — tp6667 (Kohler)Parts manual — tp6730 (Kohler)Service manual — tp6791 (Kohler)

This page was generated from the 5 manufacturer documents above by automated extraction; every figure shown is copied from one of them. How the data is compiled.

Full service, cheapest listings

Priced items from this model's own parts manual.

Oil filter GM28351$9.09
Belt GM16132$86.00
Spark plug GM16531$5.38
3 priced items$100.47