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Generac G-Force 400 Series Engine

The Generac G-Force 400 Series is a 0.46 L 1-cylinder air-cooled engine rated at 3600 rpm. It powers generator sets from Generac, including the G007029-1, G007030-1, G007171-0 and G007172-0. It holds 1.03 L (0.3 gal) of oil.

Also known as: Generac G-Force 400 Series

Part of the Generac G-Force 400 engine family — 5 variants share parts & fitment.

0.46 L

Displacement

Cylinders

3600 rpm

Rated speed

1.03 L

Oil capacity

On this pageSpecs Generator sets Maintenance FAQ Service intervals Torque & specs Fluids Fault codes Procedures Wiring

Engine specifications

Oil capacity	1.03 L
Displacement	0.46 L
Cylinders	1
Aspiration	Air-cooled
Rated speed	3600 rpm

Generator sets powered by this engine

Generac G007029-1 Generac G007030-1 Generac G007171-0 Generac G007172-0 Generac G0072100

How to read your Generac engine serial & model number →

Common problems

Unit will not start in AUTO with utility loss — LED RED LOW OIL PRESSURE
Cause: Check LEDs / screen for alarms.
Fix: Check oil level and add oil as needed. If oil level is correct, contact an IASD.
Unit will not start in AUTO with utility loss
Cause: Start delay countdown
Fix: If the start up delay is greater than expected, contact servicing dealer to adjust from 2 to 1500 seconds.
Engine starts hard and runs rough
Cause: Plugged or damaged air cleaner
Fix: Inspect and clean air cleaner.
Engine cranks but will not start
Cause: No fuel
Fix: Replenish fuel / turn on fuel valve.
Unit consumes large amounts of oil
Cause: Excessive engine oil
Fix: Adjust oil to correct level. See Checking Engine Oil Level.
No transfer to standby after utility source failure
Cause: Generator MLCB (generator disconnect) is OFF (OPEN)
Fix: Set generator MLCB (generator disconnect) to ON (CLOSED).
Yellow LED illuminated in any state LOW BATTERY
Fix: Clear alarm. Using control panel, check battery by navigating to BATTERY MENU option from MAIN MENU. If battery condition displays GOOD, contact an IASD. If control panel displays CHECK BATTERY, replace battery
Unit will not start in AUTO with utility loss — LED: RED LOW OIL PRESSURE
Fix: Check oil level and add oil as needed. If oil level is correct, contact an IASD
Generator produces zero voltage or residual voltage (12-20 kW)
Cause: Main circuit breaker open or failed
Fix: Reset to "ON" or replace if bad
Engine starts hard and runs rough / lacks power / backfires
Cause: Fuel supply and pressure faulty
Fix: Test 66 - Check fuel supply and pressure; find and correct cause of no fuel or low pressure
Engine cranks but won't start
Cause: Fuel supply and pressure faulty
Fix: Test 66 - Check fuel supply and pressure; find and correct cause of no fuel or low pressure
Engine will not crank
Cause: Blown fuse
Fix: Correct short circuit condition by replacing 7.5 A fuse in generator control panel. Contact an IASD if fuse continues to blow.
Voltage and Frequency Drop Excessively When Loads Are Applied
Cause: Overload condition; if reconfigured to LP gas, improper procedure followed; stepper motor control; shorted condition in a connected load or in one of the load circuits; stator AC power windings; engine condition
Fix: Discontinue testing; reduce loads to unit's rated capacity; verify that proper procedure was followed (refer to installation manual); repair or replace; look for a shorted condition in a connected load or in one of the load circuits; Test 7 – Check Stator AC Power Windings; Test 16 – Check Engine Condition; go to Problem 18 – Engine Starts Hard and Runs Rough/Lacks Power Section 4.3
No AC output from generator
Cause: Generator MLCB (generator disconnect) is OFF (OPEN)
Fix: Set generator MLCB (generator disconnect) to ON (CLOSED).
Shutdown alarm/fault occurred
Cause: AC output frequency faulty (single cylinder units)
Fix: Test 14 - Check AC output frequency; refer to engine service manual

Compiled from service & troubleshooting documentation across every generator set that uses the Generac G-Force 400 Series.

Maintenance schedule

Item	Spec	Part #	Interval
Air filter		0E9371AS	400 hr	Amazon eBay $19.99
Fuel filter	Servicing the air cleaner.	—	1200 hr
Oil filter	Change the oil and oil filter.	070185ES	500 hr	Amazon eBay $30.00 NAPA $9.09 FridayParts $22.99
Battery	12 volts, Group 26R-540CCA or Group 35AGM-650CCA	0H3421S	200 hr	Amazon eBay $283.32
Belt		—
Coolant		—
Oil	Synthetic SAE 5W-30	070185E	100 hr	Amazon eBay $30.00 NAPA $9.09 FridayParts $45.99
Spark plug	Spark plug gap 0.040 in (1.02 mm)	0G0767A	400 hr	Amazon eBay $18.00

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.

Repair guides

Step-by-step procedures compiled from the Generac service manual for this engine.

Service intervals

Item	Action	Hours	Months	Notes
Aceite del motor	Change	25 hr		First service — Después del período de asentamiento de 25 horas, se recomienda utilizar el aceite 5W-20 propiedad de Generac para uso continuo.
Huile moteur et filtre à huile	Change	25 hr		First service — Après les premières 25 heures de marche
Engine oil and filter	Replace	100 hr	12 mo	First service — After first 25 hours; then every 100 hours or 1 year. Cold weather (<4.4°C) or continuous hot (>29.4°C): every 100 hours or 1 year
Aceite de motor y filtro de aceite	Change	200 hr	24 mo	First service — Programa de mantenimiento A
Batería (condición, nivel de electrolito y estado de carga)	Check	200 hr	24 mo	Programa de mantenimiento A
Battery condition	Check	200 hr	24 mo	Schedule A.
Battery condition and charge	Check	200 hr	24 mo	Schedule A maintenance
Engine oil	Change	200 hr	24 mo	First service — Up to 2 year/200 hour oil change interval
Huile à moteur et filtre à huile	Change	200 hr	24 mo	First service — Calendrier A: tous les deux ans ou toutes les 200 heures. Changer l'huile et le filtre après les 25 premières heures. En conditions froides (moins de 4,4 °C/40 °F) ou fonctionnant en continu à plus de 29,4 °C/85 °F, changer annuellement ou toutes les 100 heures.
Óleo lubrificante e filtro de óleo	Change	200 hr	24 mo	First service — Trocar após as primeiras 25 horas; Programação A (2 anos ou 200 h); em clima frio (<4,4 °C) ou quente contínuo (>29,4 °C) anualmente ou 100 h
Aceite del motor y filtro de aceite	Replace	400 hr	48 mo	First service — Programa B: cada cuatro años o 400 horas.
Air filter	Replace	400 hr	48 mo	Schedule B maintenance
Battery condition, electrolyte level, and state of charge	Inspect	400 hr	48 mo	Schedule B
Bougies d'allumage	Clean	400 hr	48 mo	Nettoyer les bougies, vérifier l'écartement ou les remplacer. Calendrier A et Calendrier B.
Bujía(s)	Replace	400 hr	48 mo	Programa B: cada cuatro años o 400 horas.
Bujías	Replace	400 hr	48 mo	Programa B; limpiar, comprobar separación y sustituir
Engine air filter	Replace	400 hr	48 mo	Schedule B; emissions-critical maintenance
Engine oil and oil filter	Change	400 hr	48 mo	First service — Schedule B.
Engine oil and oil filter	Replace	400 hr	48 mo	First service — Schedule B
Filtre à air du moteur	Replace	400 hr	48 mo	Calendrier B: tous les quatre ans ou toutes les 400 heures.
Filtro de aire del motor	Replace	400 hr	48 mo	Programa de mantenimiento B
Filtro de ar do motor	Replace	400 hr	48 mo	Programação B (4 anos ou 400 h)
Folga da válvula	Adjust	400 hr	48 mo	First service — Inspecionar/ajustar após as primeiras 25 h e depois a cada 400 h; Programação B; exclui 14/18 kW com motor 816 cc
Jeu des soupapes	Adjust	400 hr		First service — Vérifier et régler après les 25 premières heures de fonctionnement, puis toutes les 400 heures.
Luz de válvulas	Adjust	400 hr	48 mo	First service — Programa B; inspeccionar/ajustar cada 400 horas
Sediment trap	Clean	400 hr	48 mo	Schedule B maintenance
Separación de la válvula	Adjust	400 hr	48 mo	First service — Programa B. Inspeccione y ajuste después de las primeras 25 horas y luego cada 400 horas. No necesario en unidades 14/18 kW con motor 816 cc.
Spark plug gap / spark plug	Clean	400 hr	48 mo	Schedule B; inspect gap and replace if necessary; emissions-critical maintenance
Spark plug(s)	Clean	400 hr	48 mo	Schedule B; inspect gap and replace if necessary
Spark plug(s)	Inspect	400 hr	48 mo	Schedule B maintenance; clean, inspect gap, replace if necessary
Spark plug(s)	Replace	400 hr	48 mo	Schedule B. Emissions-critical.
Spark plugs	Replace	400 hr	48 mo	Every Four Years or 400 Hours (Schedule B); clean, check gap, replace
Valve clearance	Adjust	400 hr	48 mo	First service — Schedule B; inspect/adjust valve clearance after first 25 hours of operation, then at 400 hour intervals. Where applicable; excludes units with hydraulic lifters (14 or 18 kW with 816cc engine).
Valve clearance	Inspect	400 hr	48 mo	First service — Where applicable; excludes units with hydraulic lifters (14 kW and 18 kW with 816cc engine).
Vela(s) de ignição	Replace	400 hr	48 mo	Programação B (4 anos ou 400 h)
Bateria	Check		12 mo	Estado da bateria; todos os anos
Batterie (état, niveau d'électrolyte et état de chargement)	Check		12 mo	Chaque année, Calendrier A (tous les deux ans ou toutes les 200 heures) et Calendrier B (tous les quatre ans ou toutes les 400 heures).
Battery condition, electrolyte level, and state of charge	Check		12 mo	Every Year (Schedule A and B)
Battery condition, electrolyte level, state of charge	Check		12 mo	Listed under Daily, Every Year, and Schedule A columns
Condición de la batería	Inspect		12 mo	Anualmente (revisión de batería y carga).

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

Service specifications

Type	Item	Value	Unit	Condition
Gap	Folga da vela de ignição	0,020	pol
Gap	Folga da vela de ignição	0,040	pol
Gap	Folga da vela de ignição	0,508	mm
Gap	Folga da vela de ignição	1,02	mm
Gap	Separación de electrodos de bujía (11 kW)	0.030	in (0.76 mm)
Gap	Separación de electrodos de bujía (16/20/22 kW)	0.040	in (1.02 mm)
Gap	Separación de electrodos de bujía (9 kW)	0.020	in (0.508 mm)
Gap	Separación de las bujías	0.508	mm (0.020 pulg.)
Gap	Separación de las bujías	1.02	mm (0.040 pulg.)
Gap	Spark Plug Gap	0.030	in (0.76 mm)	11 kW (GTH-530)
Gap	Spark plug gap	0.020	in (0.508 mm)
Gap	Spark plug gap	0.020 in (0.508 mm)	in (mm)
Gap	Spark plug gap	0.040	in (1.02 mm)
Gap	Spark plug gap	0.040 in (1.02 mm)	in (mm)
Gap	Spark plug gap	0.508	mm
Gap	Spark plug gap	1.02	mm
Gap	Spark plug gap (10 kW)	0.020	in (0.508 mm)
Gap	Spark plug gap (11 kW)	0.030	in (0.76 mm)
Gap	Spark plug gap (14-24 kW)	0.040	in (1.02 mm)
Gap	Spark plug gap (14–24 kW)	0.040	in (1.02 mm)	cold
Gap	Spark plug gap (16/20/22 kW)	0.040	in (1.02 mm)
Gap	Spark plug gap (9 kW)	0.020	in (0.508 mm)
Gap	Écartement de bougie	0,508	mm (0,020 po)
Gap	Écartement de bougie	1,02	mm (0,040 po)
Gap	Écartement des électrodes des bougies d'allumage	0.508	mm (0,020 po)
Gap	Écartement des électrodes des bougies d'allumage	0.76	mm (0,030 po)
Gap	Écartement des électrodes des bougies d'allumage	1.02	mm (0,040 po)
Other	Cold Smart Start fixed temperature	20 F (-7 C)	F (C)	22-26 kW
Other	Cold Smart Start fixed temperature	50 F (10 C)	F (C)	10-20 kW
Other	Compression ratio	9.5:1
Other	Exercise time length (16-22 kW)	5	minutes
Other	Exercise time length (9-11 kW)	12	minutes
Other	Fusível do painel de controle	7,5	A
Other	Ordem de partida (10 kW)	15 s de arranque, 7 s de repouso, seguidos por quatro ciclos adicionais de 7 s de arranque e 7 s de repouso		cinco ciclos de manivela
Other	Ordem de partida (14 a 24 kW)	16 s de arranque, 7 s de repouso, 16 s de arranque, 7 s de repouso, seguidos por três ciclos adicionais de 7 s de arranque e 7 s de repouso		cinco ciclos de manivela
Other	Perda de potência do motor por altitude	3,5	% a cada 304,8 m (1.000 pés) acima do nível do mar
Other	Perda de potência do motor por temperatura	1	% a cada 6 °C (10 °F) acima de 15 °C (60 °F)
Other	Redução de classificação GN vs PL	10 a 20	%
Other	Retardo de calentamiento con Arranque inteligente en frío	30	segundos	temperatura ambiente por debajo de la temperatura fijada
Other	Retardo de calentamiento normal	6	segundos	temperatura ambiente en o sobre la temperatura fijada
Other	Tamanho mínimo de tanque de PL ao converter de GN	946	L (250 gal)
Other	Utility failure detection threshold	65	% of nominal (for five consecutive seconds)
Other	Utility restoration threshold	80	% of nominal (for 15 consecutive seconds)
Pressure	Fuel pressure at regulator - LP	10-12	in water column (19-22 mm Hg)
Pressure	Fuel pressure at regulator - Natural Gas	3.5-7.0	in water column (9-13 mm Hg)
Pressure	Fuel pressure at regulator, LP gas	10-12 in water column (2.49-2.99 kPa)	in water column (kPa)
Pressure	Fuel pressure at regulator, NG	3.5-7.0 in water column (0.87-1.74 kPa)	in water column (kPa)
Pressure	Fuel pressure to generator fuel inlet – LP	10–12	in water column (2.49–2.99 kPa)	all load ranges
Pressure	Fuel pressure to generator fuel inlet – NG	3.5–7.0	in water column (0.87–1.74 kPa)	all load ranges
Pressure	Fuel pressure to regulator (LP)	10-12	in water column (19-22 mm Hg)	LP gas
Pressure	Fuel pressure to regulator (NG)	3.5-7.0	in water column (9-13 mm Hg)	natural gas
Pressure	Fuel pressure to regulator, LP	10–12	in water column (2.49–2.99 kPa)
Pressure	Fuel pressure to regulator, LP gas	10–12	in water column (2.49–2.99 kPa)
Pressure	Fuel pressure to regulator, NG	3.5–7.0	in water column (0.87–1.74 kPa)
Pressure	LP gas required fuel pressure at generator fuel inlet	10–12 in water column (2.49–2.99 kPa)	in water column
Pressure	Liquid propane fuel inlet pressure	10-12	in water column
Pressure	Liquid propane fuel inlet pressure	2.49-2.99	kPa
Pressure	Natural gas fuel inlet pressure	0.87-1.74	kPa
Pressure	Natural gas fuel inlet pressure	3.5-7.0	in water column
Pressure	Natural gas required fuel pressure at generator fuel inlet	3.5–7.0 in water column (0.87–1.74 kPa)	in water column

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

Recommended fluids

Fluid	Grade	Standard	Capacity	Notes
Engine oil		API SJ, SL ou mieux		Changer l'huile chaque année ou toutes les 100 heures par temps froid (< 4,4 °C) ou exploitation continue par temps chaud (> 29,4 °C)
Engine oil	5W-20			Aceite 5W-20 propiedad de Generac para uso continuo, después del período de asentamiento de 25 horas.
Engine oil	5W-20 (Generac proprietary)	API Service Class SJ, SL, or better	1.03 L	Oil capacity including filter. Use for continuous use after the 25 hour break-in period; specifically formulated for gaseous powered Generac generators. Do not use special additives. Change every year or 100 hours in cold weather (below 40 F) or continuous hot weather (above 85 F).
Engine oil	5W-30	Aceite orgánico 5W-30 (la unidad se entrega de fábrica llena con este aceite)		Compruebe el nivel de aceite y, de ser necesario, añada la cantidad apropiada con la viscosidad correcta. No llene en exceso. Consulte 'Recomendaciones para el aceite de motor' para tipo/viscosidad.
Engine oil	5W-30 (factory fill) / 5W-20 GEO (continuous)	Generac proprietary gaseous engine oil (GEO)		Unit comes filled with 5W-30 organic oil; after 25 hour break-in use 5W-20 GEO
Engine oil	Generac 5W-20 exclusive	API SJ, SL ou mieux		Après la période de rodage de 25 heures et à chaque intervalle; spécialement formulée pour les génératrices Generac alimentées au gaz
Engine oil	SAE 5W-30 Synthetic	API Service Class SJ, SL or better		Do not use special additives
Engine oil	SAE 5W-30 sintético	API SJ, SL o mejor	1.03 l	9 kW; no usar aditivos especiales
Engine oil	SAE 5W-30 synthétique	API classe de service SJ, SL ou supérieure		Huile SAE 5W-30 synthétique pour toutes les plages de température. N'utilisez aucun additif spécial.
Engine oil	Synthetic SAE 5W-30	API Service Class SJ, SL, or better		Synthetic SAE 5W-30 for all temperature ranges. Do not use special additives. Capacities incl. filter: approx. 1.1 qt (1.03 L) 9 kW; approx. 1.7 qt (1.6 L) 11 kW; approx. 1.9 qt (1.8 L) 16/20/22 kW.
Fuel		Gas natural: contenido de BTU de por lo menos 1000 BTU/ft3 (37,26 MJ/m3). Gas LP: por lo menos 2500 BTU/ft3 (93,15 MJ/m3)	250.0 gal (946 l)	Tamaño mínimo del tanque de LP es 250 gal (946 l), salvo que los cálculos de la unidad indiquen uno mayor. Solo sistema de extracción de vapor para LP.
Fuel	Gas natural	mínimo 1000 BTU por pie cúbico (37.26 megajulios por metro cúbico)		Reducciones típicas de gas natural 10-20 % respecto a LP
Fuel	Gaz naturel		37.26 mégajoules par mètre cube (1 000 BTU par pied cube) minimum	Teneur en BTU minimale du gaz naturel.
Fuel	Gaz naturel d'au moins 37,26 mégajoules par mètre cube (1 000 BTU par pied cube)	NFPA 54
Fuel	Gaz propane liquide (gazeux)		93.15 mégajoules par mètre cube (2 500 BTU par pied cube) minimum	Capacité de réservoir de gaz propane liquide minimum recommandée de 946 litres (250 gallons).
Fuel	Gaz propane liquide d'au moins 93,15 mégajoules par mètre cube (2 500 BTU par pied cube)	NFPA 58 / ICC IFGC		Réservoir de gaz propane liquide d'une capacité minimale de 946 litres (250 gallons).
Fuel	LP (vapor)	mínimo 2500 BTU por pie cúbico (93.15 megajulios por metro cúbico)	946.0 l	Se recomienda tanque de LP de 250 gal. (946 l) de tamaño mínimo si se convierte de NG a LP
Fuel	LP gas (vapor), minimum 2,500 BTUs per ft3 (93.15 megajoules per m3)			Vapor withdrawn liquid propane.
Fuel	Liquid Propane (LP) vapor withdrawn or pipeline Natural Gas			NG min 1000 BTU/cu ft (37.26 MJ/m3); LP min 2500 BTU/cu ft (93.15 MJ/m3); min LP tank size 250 gal (946 L) recommended if converting from NG
Fuel	Liquid Propane (vapor)		2500.0 BTU/ft3 (93.15 MJ/m3) minimum	Vapor withdrawn; minimum tank size 250 gal (946 L) when converting from NG
Fuel	Liquid propane (LP) vapor	BTU content at least 2,500 BTUs per ft3 (93.15 megajoules per m3)		If converting to LP gas from NG, a minimum LP tank size of 250 gal (946 L) is recommended.
Fuel	Natural Gas		1000.0 BTU/ft3 (37.26 MJ/m3) minimum	Pipeline natural gas
Fuel	Natural gas (NG)	BTU content at least 1,000 BTUs per ft3 (37.26 megajoules per m3)		Unit factory-configured to run on NG.
Fuel	Natural gas (NG) or liquid propane (LP) vapor	Minimum 1,000 BTUs per ft3 (37.26 MJ per m3) for NG; minimum 2,500 BTUs per ft3 (93.15 MJ per m3) for LP		Dual fuel carburetion; factory configured for NG. If converting to LP, minimum LP tank size of 250 gal (946 L) recommended
Fuel	Natural gas (vapor) or liquid propane vapor	NG at least 1,000 BTU/ft3 (37.26 MJ/m3); LP at least 2,500 BTU/ft3 (93.15 MJ/m3)		Factory configured for NG; minimum 250 gal (946 L) LP tank recommended if converting to LP
Fuel	Natural gas or LP gas			Required fuel pressure to generator fuel inlet: 3.5–7.0 in water column for NG; 10–12 in water column for LP
Fuel	Natural gas, minimum 1,000 BTUs per ft3 (37.26 megajoules per m3)			Dual fuel carburetion; factory-configured for NG. Minimum LP tank size 250 gal (946 L) if converting to LP.
Fuel	Natural gas: at least 1,000 BTU/ft3 (37.26 MJ/m3); LP gas: at least 2,500 BTU/ft3 (93.15 MJ/m3)			LP gas should only use a vapor withdrawal system
Fuel	Propano líquido (vapor)	Contenido de BTU de al menos 93.15 MJ/m3 (2,500 BTU/pie3); presión de suministro 2.49 a 2.99 kPa (10 a 12 pulg. de columna de agua) en la entrada de combustible	946.0 L (tamaño mínimo de tanque recomendado, 250 gal)	Solo sistema de recuperación de vapor. No conectar a un tanque de propano líquido de 20 o 30 lb (9 o 14 kg).
Other		Fluido detector de fugas de gas no corrosivo		Para comprobación de fugas en todos los puntos de conexión durante las pruebas y el mantenimiento normal.

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

Fault codes

Code	Name	Meaning	Severity	Action
AUXILIARY SHUTDOWN	Auxiliary Shutdown	Unit will not start	Shutdown	Set auxiliary shutdown switch(es) to CLOSED (I); clear alarm
BATERÍA BAJA	BATERÍA BAJA	Indicador LED amarillo encendido en cualquier estado.	Warning	Borre la alarma. Navegue hasta BATTERY MENU del MAIN MENU para revisar la batería. Si indica GOOD, comuníquese con un IASD. Si indica CHECK BATTERY, reemplace la batería.
Battery Problem	Battery Fault	Battery condition poor or battery charger issue	Warning	Inspect battery condition and connections. Contact IASD if needed.
BATTERY PROBLEM	Problema de batería	El LED amarillo se ilumina en cualquier estado	Warning	Contactar un IASD
CARGADOR SIN CA	CARGADOR SIN CA	Indicador LED amarillo encendido en cualquier estado.	Warning	Comuníquese con un IASD.
CHARGER MISSING AC	Charger Missing AC	Yellow LED illuminated in any state	Warning	Contact an IASD
CHARGER WARNING	Advertencia del cargador	El LED amarillo se ilumina en cualquier estado	Warning	Contactar un IASD
Controller Fault	Control Module Failure	Internal controller fault detected	Shutdown	Contact IASD for assistance
CONTROLLER FAULT	Controller Fault	Alarm message listed on controller menu.	Shutdown	Contact an IASD.
DESCONEXIÓN AUXILIAR	DESCONEXIÓN AUXILIAR	La unidad no arranca.	Shutdown	Coloque los interruptores de desconexión auxiliar en posición CERRADA (I).
EMERGENCY STOP	Emergency Stop	Alarm message listed on controller menu.	Shutdown	Check emergency shutdown switch and reset.
FUSE PROBLEM	Fuse Problem	Unit will not start in AUTO with utility loss. (Firmware 1.11 and older only.)	Shutdown	Check the 7.5 amp fuse. If blown, replace with an ATO 7.5 amp fuse. If intact, contact an IASD.
High Temperature	Overheat	Engine operating temperature too high	Shutdown	Inspect ventilation around generator, intake, exhaust, and rear. Ensure no obstructions present.
HIGH TEMPERATURE	High Temperature	Unit shuts down during operation.	Shutdown	Check ventilation around the generator, intake, exhaust, and rear of generator. If no obstructions are present, contact an IASD.
INSPECCIONE LA BATERÍA	INSPECCIONE LA BATERÍA	Indicador LED amarillo encendido en cualquier estado.	Warning	Inspeccione la batería. Presione ENTER para borrar.
INSPECT BATTERY	Inspeccionar batería	El LED amarillo se ilumina en cualquier estado	Warning	Inspeccionar la batería; pulsar ENTER para desactivar
Low Battery	Battery Voltage Low	Starting battery voltage below acceptable level	Warning	Inspect battery and battery cables. Charge or replace battery if necessary.
LOW BATTERY	Batería baja	El LED amarillo se ilumina en cualquier estado	Warning	Desactivar la alarma; comprobar batería en BATTERY MENU; si GOOD contactar un IASD, si CHECK BATTERY sustituir la batería
Low Oil Pressure	Low Oil Level or Pressure	Insufficient oil pressure in engine	Shutdown	Check engine oil level and top up if necessary. Contact IASD if problem persists.
LOW OIL PRESSURE	Low Oil Pressure	Unit will not start in AUTO with utility loss.	Shutdown	Check oil level and add oil as needed. If oil level is correct, contact an IASD.
LOW VOLTS REMOVE LOAD	Low Volts	Unit will not start in AUTO with utility loss.	Shutdown	Clear alarm and remove household loads from the generator. Put in AUTO and restart.
MISWIRE	Miswire / Wiring Error	Unit will not start in AUTO with utility loss.	Shutdown	Contact an IASD.
NOT ACTIVATED	Not Activated	Unit will not start in AUTO with utility loss.		Refer to 'Activation' in installation manual.
Overcrank	Extended Cranking	Engine failing to start after extended crank attempts	Shutdown	Check fuel supply, spark plugs, and fuel system. Contact IASD for further diagnosis.
OVERCRANK	Overcrank	Unit will not start in AUTO with utility loss.	Shutdown	Check fuel line shutoff valve is ON. Clear alarm. Start the unit in MANUAL. If it does not start or runs rough, contact an IASD.
Overload	Overload Detected	Electrical load exceeds generator capacity	Shutdown	Remove household electrical loads from generator
OVERLOAD REMOVE LOAD	Overload	Unit shuts down during operation.	Shutdown	Clear alarm and remove household loads from the generator. Put in AUTO and restart.
OVERLOAD WARNING	Aviso de sobrecarga	Aviso de sobrecarga.	Warning	Remova as cargas domésticas do gerador.
Overspeed	RPM Overspeed	Engine running at excessive RPM	Shutdown	Contact IASD for assistance
OVERSPEED	Overspeed	Unit will not start in AUTO with utility loss.	Shutdown	Contact an IASD.
Overvoltage	Output Voltage High	Generator voltage exceeding nominal rating	Shutdown	Reduce electrical load and restart. Contact IASD if issue persists.
OVERVOLTAGE	Overvoltage	Unit will not start in AUTO with utility loss.	Shutdown	Contact an IASD.
PROBLEMA DE BATERÍA	PROBLEMA DE BATERÍA	Indicador LED amarillo encendido en cualquier estado.	Warning	Comuníquese con un IASD.
RPM SENSE LOSS	Pérdida de detección de rpm	La unidad se para e intenta volver a ponerse en marcha	Shutdown	Desactivar la alarma, retirar cargas, poner en AUTO y reanudar; si no arranca contactar un IASD
RPM Sensor Loss	RPM Signal Loss	RPM sensor signal not detected	Shutdown	Contact IASD for assistance
SERVICE A	Service A	Yellow LED illuminated in any state.	Warning	Perform SERVICE A maintenance. Press ENTER to clear.
SERVICE B	Service B	Yellow LED illuminated in any state.	Warning	Perform SERVICE B maintenance. Press ENTER to clear.
SHUTDOWN SWITCH	Shutdown Switch	Unit will not start. Flashing red LED.	Shutdown	Check emergency shutdown switches. Set switch(es) to CLOSED (I). Clear alarm.
STEPPER OVERCURRENT	Stepper Overcurrent	Unit will not start in AUTO with utility loss.	Shutdown	Contact an IASD.
Underspeed	Engine Speed Too Low	Engine RPM below nominal specification	Shutdown	Contact IASD for assistance
UNDERSPEED	Underspeed	Unit will not start in AUTO with utility loss.	Shutdown	Contact an IASD.
Undervoltage	Output Voltage Low	Generator voltage below nominal rating	Shutdown	Reduce electrical load and restart. Contact IASD if issue persists.
UNDERVOLTAGE	Undervoltage	Unit will not start in AUTO with utility loss.	Shutdown	Contact an IASD.
USB WARNING	Aviso de USB	Aviso relacionado ao dispositivo USB.	Warning	Tente novamente com USB de melhor qualidade. Os nomes dos ficheiros no USB não podem ter mais de 8 caracteres.
Wiring Error	Electrical Wiring Fault	Wiring configuration error detected	Shutdown	Contact IASD for assistance
WIRING ERROR	Wiring Error	Unit will not start in AUTO with utility loss	Shutdown	Contact an IASD

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

Procedures

Adjust Valve Clearance adjustment

⚠ Allow engine to cool before adjusting valve clearance.

Tools: feeler gauge, 10 mm wrench, 13 mm wrench, 14 mm wrench, 8 mm wrench, 10 mm Allen wrench, torque wrench

Make sure piston is at TDC of compression stroke (both valves closed).
Remove spark plug wire(s) and position away from plugs.
Remove spark plug(s).
Remove the four screws attaching valve cover; remove and discard gasket.
Loosen rocker jam nut (10 mm wrench 9-11 kW; 13 mm wrench 16-22 kW).
Turn pivot ball stud (14 mm wrench 9 kW; 8 mm wrench 11 kW; 10 mm Allen 16-22 kW) while checking clearance with feeler gauge.
Hold rocker arm jam nut in place as pivot ball stud is turned.
When clearance correct, hold pivot ball stud and tighten rocker arm jam nut to torque spec.
Recheck valve clearance after tightening jam nut.
Install new valve cover gasket.
Install valve cover; tighten fasteners in cross pattern to torque spec.
Install spark plugs and torque to 18 ft-lbs (25 Nm).
Reattach spark plug wire to spark plug.
Repeat process for other cylinder if necessary.

Adjusting Valve Clearance adjustment

⚠ Risk of Burn. Allow the engine to cool before performing the following procedure.

Tools: Feeler gauge, 10 mm wrench, 13 mm wrench, 14 mm wrench, 10 mm hex key

Allow engine to cool before adjusting valve clearance.
Remove spark plug wire(s) away from plugs and remove spark plug(s).
Remove the four screws attaching the valve cover; remove and discard gasket.
Verify piston is at TDC of its compression stroke (both valves closed).
Loosen rocker jam nut using a 10 mm wrench (10 kW) or 13 mm wrench (20–22 kW).
Turn pivot ball stud with a 14 mm wrench (10 kW) or 10 mm hex key (20–22 kW) while checking clearance with a feeler gauge.
Hold pivot ball stud and tighten rocker arm jam nut to specification.
After tightening jam nut, verify valve clearance did not change.
Install new valve cover gasket and valve cover; tighten fasteners in a cross pattern.
Install spark plugs and tighten to 18 ft-lbs (25 Nm).
Attach spark plug wire to spark plug.
Repeat process for other cylinder if equipped.

Ajustar a folga das válvulas adjustment

⚠ Risco de queimaduras. Deixe o motor esfriar antes de executar o procedimento.

Tools: Chave de 10 mm, Chave de 13 mm, Chave de 14 mm, Chave sextavada de 10 mm, Calibrador

Remova os fios das velas de ignição e remova as velas de ignição.
Remova os quatro parafusos que prendem a tampa da válvula; descarte a junta.
Verifique se o pistão está no TDC do seu curso de compressão.
Solte a contraporca do balanceiro (C) com chave de 10 mm ou 13 mm.
Gire o pino de esfera articulada (D) com chave de 14 mm ou sextavada de 10 mm e ajuste a folga.
Aperte a contraporca do braço oscilante e inspecione a folga novamente.
Instale a nova junta e as tampas das válvulas; aperte em padrão transversal.
Instale as velas e aperte a 25 Nm; conecte os fios das velas.

Ajuste de la luz de válvulas adjustment

⚠ Dejar enfriar el motor antes de ajustar.

⚠ Iniciar los cuatro tornillos antes de apretar.

Tools: Calibre de espesores, Llaves de 8/10/13/14 mm, Llave de casquillo, Casquillo grande

Cerrar la válvula de combustible y desconectar la batería.
Retirar cable(s) de bujía y alejarlos.
Retirar la(s) bujía(s).
Llevar el pistón al PMS de la carrera de compresión.
Retirar los cuatro tornillos de la cubierta de válvulas y desechar la junta.
Aflojar la contratuerca del balancín.
Girar el prisionero de bola pivote para ajustar la luz con calibre.
Sostener el prisionero y apretar la contratuerca; verificar y reinstalar con junta nueva.

Ajuste de la separación de la válvula adjustment

⚠ Deje que el motor se enfríe antes del procedimiento.

⚠ Desconecte el cable negativo y luego el positivo de la batería.

⚠ No necesario en unidades 14 o 18 kW con motor de 816 cc.

Tools: Llave de 10 mm, Llave de 13 mm, Llave de 14 mm, Llave hexagonal de 10 mm, Galga de espesores

Retire los hilos de las bujías y las bujías.
Retire los cuatro tornillos de la cubierta de la válvula y deseche la junta.
Verifique que el pistón esté en el PMS de su carrera de compresión.
Suelte la contratuerca del balancín (llave 10 mm en 10 kW, 13 mm en 20 a 24 kW).
Gire el espárrago del pivote (llave 14 mm en 10 kW, hexagonal 10 mm en 20 a 24 kW) ajustando la separación.
Sostenga el espárrago y apriete la contratuerca del balancín.
Inspeccione la separación para verificar que no cambió.
Instale una junta nueva y la cubierta de la válvula; apriete en patrón cruzado.
Instale las bujías y apriete a 25 Nm (18 lb-pie).
Conecte los hilos de las bujías.

Ajuster le jeu des soupapes adjustment

⚠ Risque de brûlure : laisser le moteur refroidir avant d’exécuter la procédure.

⚠ Réglage non requis sur les modèles de 14 ou 18 kW à moteur de 816 cc.

Tools: Clé de 10 mm ou 13 mm, Clé de 14 mm ou clé hexagonale de 10 mm, Jauge d’épaisseur

Laisser le moteur refroidir.
Débrancher les câbles de bougie et les placer à l’écart.
Retirer les bougies.
Retirer les quatre vis du cache-culbuteurs et mettre le joint au rebut.
S’assurer que le piston est au point mort haut (PMH) de sa course de compression.
Desserrer le contre-écrou de culbuteur.
Faire tourner le goujon pivot tout en contrôlant le jeu avec une jauge d’épaisseur.
Ajuster le jeu conformément à la section Moteur.
Tenir le goujon pivot et serrer le contre-écrou au couple spécifié.
Poser un joint de cache-culbuteurs neuf et remonter le cache-culbuteurs.
Mettre les bougies en place au couple de 25 Nm (18 pi-lb).

Checking Valve Clearance adjustment

⚠ Risk of Burn. Allow the engine to cool before performing the following procedure.

⚠ Accidental start-up. Disconnect spark plug wires when working on unit.

Tools: Feeler gauge, Large socket and socket wrench

Close fuel valve and disconnect battery to avoid accidental startup.
Remove spark plug wire(s) and position away from plug(s).
Remove spark plug(s).
Remove the four screws attaching the valve cover; remove and discard gasket.
Verify piston is at top dead center (TDC) of its compression stroke (both valves closed).
Inspect valve clearance between each rocker arm and valve stem with a feeler gauge.
Install replacement valve cover gasket(s).
Install valve cover(s); tighten fasteners in a cross pattern.

Conversion de carburant adjustment

⚠ Explosion et incendie. Le carburant et ses vapeurs sont extrêmement inflammables et explosifs.

Localiser le bouton orange de conversion (A).
Tourner le bouton vers la flèche indiquant la source de carburant jusqu'à l'arrêt.
Le bouton tourne sur 180° et glisse dans le corps du mélangeur pour le propane liquide.
Saisir la sélection du carburant (PL ou GN) sur l'automate de contrôle (Assistant d'installation ou menu EDIT > Fuel Selection).

Conversión de combustible adjustment

⚠ Explosiones e incendio: no se permiten fugas de combustible.

Ubique la perilla naranja de conversión de combustible (debajo del mezclador en 9 kW, sobre el mezclador en 11 kW–22 kW).
Gire la válvula hacia la marca de flecha de la fuente de combustible hasta que se detenga.
Introduzca la selección de combustible (LP/gas natural) en el controlador mediante el Asistente de instalación o el menú EDIT, 'Fuel Selection'.

Conversión de combustible (GN a PL) adjustment

⚠ La perilla del selector de combustible debe ajustarse al combustible correcto para que el generador funcione correctamente.

Ubique la perilla de conversión de combustible naranja (bajo el mezclador en 10 kW; sobre el mezclador en 14 a 24 kW).
Gire la perilla de conversión hacia la flecha del tipo de combustible marcado hasta que se detenga.
La perilla gira 180° y se desliza hacia dentro del mezclador al convertir a propano líquido.
Ingrese la selección de combustible (PL/GN) en el controlador mediante el Asistente de instalación o el menú EDITAR.

Fuel Conversion (NG to LP) adjustment

⚠ Fuel and vapors are extremely flammable and explosive; no leakage permitted.

Turn fuel conversion knob toward marked fuel source arrow until it stops (rotates 180° and slides into mixer body).
Enter fuel selection (LP/NG) on controller using Install Wizard or EDIT menu under Fuel Selection.

Réglage du jeu des soupapes adjustment

⚠ Laisser le moteur refroidir avant d'ajuster le jeu des soupapes.

Tools: Clé à douille, Clés de 8/10/13/14 mm, Jauge d'épaisseur

Amener le piston au PMS de sa course de compression (les deux soupapes fermées).
Retirer les fils des bougies d'allumage et les écarter.
Retirer les bougies.
Retirer les quatre vis du couvercle des soupapes et jeter le joint.
Desserrer le contre-écrou du culbuteur (clé de 10 mm pour 9-11 kW ou 13 mm pour 16-22 kW).
Tourner le pivot à rotule tout en vérifiant le jeu avec une jauge d'épaisseur.
Maintenir le pivot et serrer le contre-écrou selon les spécifications.
Vérifier de nouveau le jeu.
Installer un nouveau joint sur le couvercle des soupapes.
Installer le couvercle et serrer les attaches en tracé croisé au couple spécifié.
Installer les bougies d'allumage et serrer à 25 N.m (18 pi-lb).
Rebrancher le câble de bougie.
Répéter au besoin pour l'autre cylindre.

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
		0 – c.c. (-)	NOIR no 3	Fil de mise à la terre normal; obligatoire si jumelé à un commutateur de transfert de gestion intelligente de l'alimentation de Generac.
		23	BLANCO Núm. 5	Cable de señal lógica del control de transferencia
		Generator control wiring - 1-115 ft (1-35 m)	N1, N2, T1, 23, 194	No. 18 AWG
		Generator control wiring - 116-185 ft (36-56 m)	N1, N2, T1, 23, 194	No. 16 AWG
		Generator control wiring - 186-295 ft (57-89 m)	N1, N2, T1, 23, 194	No. 14 AWG
		Generator control wiring - 296-460 ft (90-140 m)	N1, N2, T1, 23, 194	No. 12 AWG
		Longueur de fil 1 à 35 m (1 à 115 pi)	Calibre 18 AWG	Conducteurs en cuivre seulement.
		Longueur de fil 35 à 56 m (115 à 185 pi)	Calibre 16 AWG	Conducteurs en cuivre seulement.
		Longueur de fil 56 à 89 m (185 à 295 pi)	Calibre 14 AWG	Conducteurs en cuivre seulement.
		Longueur de fil 89 à 140 m (295 à 460 pi)	Calibre 12 AWG	Conducteurs en cuivre seulement.
		Neutral for battery charger	WHITE NEU/00	Must be connected to keep battery charged whether unit is running or not
0 VCC		0	NEGRO Núm. 3	CC (-) Cable común de conexión a tierra. Requerido si el generador está apareado con un interruptor de transferencia de gestión de alimentación inteligente Generac.
12 V c.c.		194 – c.c. (+)	ROUGE no 4	Pour les commandes de transfert.
12 VCC		194	ROJO núm. 4	CC (+) para los controles de transferencia
12 VDC		DC (+) 12 VDC for transfer controls	RED 194
12 VDC		DC (-) common ground wire	BLACK 0
12 VDC		Transfer control signal wire	WHITE 23	Required if generator is paired with optional Digital Power Management (DPM) smart technology
120 V c.a.		T1	BLEU no 3	Avec fusible 120 V c.a. pour le chargeur de la batterie; doit être branché pour que la batterie demeure chargée.
120 VAC		Fused 120 VAC for battery charger	BLUE T1	Must be connected to keep battery charged whether unit is running or not
120 VCA		T1	AZUL Núm. 3	Con fusible para el cargador de baterías (debe estar conectado para mantener la batería cargada, esté o no funcionando la unidad)
240 V c.a.		N1 et N2	JAUNE no 1 et no 2	Détectent les chutes et les hausses du réseau public.
240 VAC		Utility dropout and pickup sensing	YELLOW N1 & N2
240 VAC	1	Customer load to T1 and T2 terminals	T1, T2	Load leads are pre-wired at the factory
240 VAC	1	Generator (standby) source to E1 and E2 terminals	E1, E2
240 VAC	1	Utility (normal) source to N1 and N2 terminals	N1, N2	Single-phase neutral connected to neutral lug, not switched
240 VCA		N1 y N2	AMARILLO Núm. 1 y Núm. 2	Detección de desenganche y activación del servicio público

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

Parts cataloged across the Generac G-Force 400 family

Part #	Description	Category
0E9371A	Air Filter	Air filter
0E9371AS	Air filter	Air filter
0J8478	Air Filter	Air filter
0J8478S	Air filter	Air filter
G005819-0	26R Wet Cell Battery	Battery
0C2979	GASKET, VALVE COVER	Gasket
0K8946	Joint de cache-culbuteurs	Gasket
10000014927	Joint de cache-culbuteurs	Gasket
070185E	Oil Filter	Oil filter
070185ES	Filtre à huile recommandé	Oil filter
0D7178T	Control panel fuse	Service part / kit
0H3421S	26R Exide battery	Service part / kit
G005621-0	Auxiliary Transfer Switch Contact Kit	Service part / kit
G005703-0	Paint Kit	Service part / kit
G006482-0	Scheduled Maintenance Kit	Service part / kit
G007000-0	Smart Management Module (50 amp)	Service part / kit
G007005-0	Wi-Fi LP Fuel Level Monitor	Service part / kit
G007006-0	Smart Management Module (100 amp)	Service part / kit
G007027-0	Fascia Base Wrap Kit	Service part / kit
G007101-0	Battery Pad Warmer	Service part / kit
G007102-0	Oil Warmer	Service part / kit
G007103-1	Breather Warmer	Service part / kit
G007169-0	Mobile Link® Cellular Accessories - 4G LTE	Service part / kit
G007170-0	Mobile Link® Cellular Accessories - Wi-Fi/Ethernet	Service part / kit
G007216-0	Scheduled Maintenance Kit	Service part / kit
0G0767A	Spark Plug (RC12YC or equivalent)	Spark plug
0G0767B	Spark Plug	Spark plug

Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.

Common questions

What is the oil capacity of the Generac G-Force 400 Series?

The Generac G-Force 400 Series engine has an oil capacity of 1.03 liters.

What is the displacement of the Generac G-Force 400 Series?

The Generac G-Force 400 Series has a displacement of 0.46 liters with 1 cylinders.

Which generators use the Generac G-Force 400 Series engine?

The Generac G-Force 400 Series powers 5 generator set(s), including Generac G007029-1, Generac G007030-1, Generac G007171-0, Generac G007172-0, Generac G0072100.

How often should you change the oil in the Generac G-Force 400 Series?

The Generac G-Force 400 Series oil change interval is every 100 hours.

What is a common problem with the Generac G-Force 400 Series engine?

A commonly reported issue on generators using the Generac G-Force 400 Series is: Unit will not start in AUTO with utility loss — LED RED. Cause: Check LEDs / screen for alarms.. Fix: Check oil level and add oil as needed. If oil level is correct, contact an IASD..