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Generac Inline 4 Engine

Name: Generac Inline 4 Engine
Brand: Generac

The Generac Inline 4 is a 2.4 L 4-cylinder naturally aspirated engine rated at 1800 rpm, producing up to 25 kW. It powers generator sets from Generac, including the In Line 4, QT022, QT025 and QT027. It holds 5.25 L (1.4 gal) of oil and 2.5 L (0.7 gal) of coolant.

Also known as: Generac Inline 4

2.4 L

Displacement

Cylinders

1800 rpm

Rated speed

25 kW

Gross power

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

Engine specifications

Oil capacity	5.25 L
Coolant capacity	2.5 L
Displacement	2.4 L
Cylinders	4
Aspiration	Naturally Aspirated
Rated speed	1800 rpm
Gross power	25 kW

Generator sets powered by this engine

Generac In Line 4 Generac QT022 Generac QT025 Generac QT027 Generac QT036 Generac QT045

How to read your Generac engine serial & model number →

Common problems

Engine cranks but won't start
Cause: 1. Out of fuel. 2. Fuel solenoid (FS) is defective 3. Open Wire #14A from Engine Control circuit board. 4. Spark plugs defective. 5. Door on tank not closed.
Fix: 1. Replenish fuel. 2. Replace solenoid.* 3. Reconnect wire. 4. Clean, regap or replace plugs. 5. Close door on tank.
Engine won’t crank.
Cause: 1. 15 amp fuse blown. 2. Loose or corroded or defective battery cables. 3. Defective starter contactor. 4. Defective starter motor. 5. Dead or Defective Battery. 6. 5 amp fuse blown.
Fix: 1. Replace fuse. 2. Tighten, clean or replace battery cables as necessary. 3. Replace contactor.* 4. Replace starter motor.* 5. Remove, change or replace battery. 6. Replace fuse.*
Engine starts hard, runs rough.
Cause: 1. Flame arrestor (air cleaner) plugged or damaged. 2. Plugged fuel line. 3. Defective spark plugs. 4. Fuel pressure incorrect.
Engine oil level is low.
Cause: 1. Engine starts then shuts down. AUTO/OFF/MANUAL Switch at OFF, engine continues to run
Engine starts then shuts down. 13
No AC output from generator.
Cause: Defective Control Module circuit board
Fix: Replace board.*
Open/disconnected wire #15A between AUTO/OFF/MANUAL switch and Control Module circuit board. 12
Not stated Safety004
Fix: Engine shutdown; restart after temperature returns to safe operating level; add oil and reset generator control board
Engine is overheated. 5
Defective Low Oil Pressure Switch 6
Defective Low Coolant Level Switch 10
Defective Coolant Temperature Switch 7
Defective Control Module circuit board 8
Defective AUTO/OFF/MANUAL switch 11
Coolant Level is Low. 9

Compiled from service & troubleshooting documentation across every generator set that uses the Generac Inline 4.

Maintenance schedule

Item	Spec	Capacity	Part #	Interval
Air filter			—	500 hr
Fuel filter			—	50 hr
Oil filter			—	100 hr
Battery	Group 24F, 525CCA		—
Belt	inspect belts and hoses		—	500 hr
Coolant	Standard		—
Coolant filter			—
Oil		4.0	—	100 hr
Spark plug			—

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

Service intervals

Item	Action	Hours	Months	Notes
Oil level	Check	24 hr	1 mo	Monthly or 24 hours of continuous operation
Oil	Change	200 hr	24 mo	First service — After the first 25 hours of operation
Oil filter	Change	200 hr	24 mo	First service — After the first 25 hours of operation
Valve clearance	Check	400 hr		First service — After the first 25 hours of operation
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 and charge	Check	200 hr	24 mo	Schedule A maintenance
Complete Tune-Up	Other	200 hr	24 mo	Independent Authorized Dealer must perform; 2 years or 200 hours
Engine oil and oil filter	Replace	200 hr	24 mo	First service — Schedule A (Every Two Years or 200 Hours) and Schedule B (Every Four Years or 400 Hours). Change engine oil and filter after first 25 hours. In cold weather (below 40 F / 4.4 C) or continuous hot weather (above 85 F / 29.4 C), change every year or 100 hours.
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 cleaner	Clean	400 hr		Clean or replace as necessary; R = Replace as Necessary; 400 hours
Air filter	Replace	400 hr	48 mo	Schedule B maintenance
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.
Engine oil and oil filter	Change	400 hr	48 mo	First service — Schedule B (every four years or 400 hours).
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(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).
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	Check		12 mo	Check charge state; yearly
Battery	Clean		12 mo	Remove corrosion, ensure dryness; yearly
Battery condition, electrolyte level, and state of charge	Check		12 mo	Every Year (Schedule A and B)
Battery electrolyte level	Check		6 mo	Unsealed batteries only; every 6 months; notify Dealer if repair is needed
Battery terminals	Clean		12 mo	Clean and tighten; yearly

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	0.020	in (0.508 mm)	9 kW (GH-426)
Gap	Spark Plug Gap	0.030	in (0.76 mm)	11 kW (GTH-530)
Gap	Spark Plug Gap	0.040	in (1.02 mm)	16/20/22 kW (GT-999)
Gap	Spark plug gap	0.508	mm
Gap	Spark plug gap	0.76	mm (0.030 in)
Gap	Spark plug gap	1.02	mm (0.040 in)
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 (16/20/22 kW)	0.040	in (1.02 mm)
Gap	Spark plug gap (9 kW)	0.020	in (0.508 mm)
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	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 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 (natural gas)	3.5-7	inches water column (7-13 mm mercury)
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	Presión de combustible al regulador (LP)	10–12	in de columna de agua (19–22 mm de mercurio)
Pressure	Presión de combustible al regulador (gas natural)	3.5–7.0	in de columna de agua (9–13 mm de mercurio)
Pressure	Presión de combustible requerida - gas natural	3,5–7,0	pulgadas de columna de agua	En la entrada de combustible del generador (7–13 mm de mercurio)
Pressure	Presión de combustible requerida - vapor de propano líquido	10–12	pulgadas de columna de agua	En la entrada de combustible del generador (19–22 mm de mercurio)
Pressure	Presión del combustible (GN)	0.87 a 1.74	kPa (3.5 a 7.0 pulg. de columna de agua)
Pressure	Presión del combustible (PL)	2.49 a 2.99	kPa (10 a 12 pulg. de columna de agua)
Pressure	Pression de carburant au régulateur (gaz naturel)	9 à 13	mm Hg (3,5 à 7 po de colonne d'eau)
Pressure	Pression de carburant au régulateur (propane liquide)	19 à 22	mm Hg (10 à 12 po de colonne d'eau)
Pressure	Pression de carburant — gaz naturel	7 à 13 mm Hg (3,5 à 7 po de colonne d'eau)	mm Hg / po colonne d'eau	À l'entrée de carburant du générateur
Pressure	Pression de carburant — vapeur de propane liquide	19 à 22 mm Hg (10 à 12 po de colonne d'eau)	mm Hg / po colonne d'eau	À l'entrée de carburant du générateur
Pressure	Pressão do combustível (GN) para o regulador	0,87–1,74	kPa	gás natural
Pressure	Pressão do combustível (GN) para o regulador	3,5–7,0	pol de coluna de água	gás natural
Pressure	Pressão do combustível (PL) para o regulador	10–12	pol de coluna de água	gás PL
Pressure	Pressão do combustível (PL) para o regulador	2,49–2,99	kPa	gás PL
Speed	Cranking cycle	15 sec crank, 7 sec rest, then 4 cycles of 7 sec crank/7 sec rest		9 kW unit

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	Ambient	Capacity	Notes
Engine oil	30 weight organic oil (factory fill)				Units run and tested at factory prior to shipping, no break-in required
Engine oil	5W-20	API Classe de Serviço SJ, SL ou superior		1.03 L	Óleo 5W-20 exclusivo Generac recomendado continuamente após o período inicial de 25 horas; não use aditivos especiais. Capacidade: 10 kW ≈ 1,03 L; 14/18 kW ≈ 2,1 L; 20-24 kW ≈ 1,8 L
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	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 5W-30	API Service Class SJ, SL or better			For all temperature ranges; use no special additives
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.
Engine oil	10W-30	API Service Class SJ, SL or better	-23°C to 4°C		Between 40 and -10 F (4 and -23 C)
Engine oil	SAE 30	API Service Class SJ, SL or better	above 0°C		Above 32 F (0 C)
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	Liquid Propane (LP) Vapor	btu content of at least 2,500 Btus per cubic foot (93.15 megajoules per cubic meter)		250.0 gallons (946 liters) minimum LP tank size recommended	If converting from natural gas to LP
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	btu content of at least 1,000 Btus per cubic foot (37.26 megajoules per cubic meter)			Unit factory set for 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.
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.
Other	Solución de bicarbonato de sodio			454.0	Agente neutralizante de ácidos para derrames de electrolito de batería.

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	Desligamento auxiliar	A unidade não inicia.	Shutdown	Coloque as chaves de parada auxiliares em FECHADO (I). Apague o alarme.
BATTERY PROBLEM	Problema de batería	Yellow LED illuminated in any state.	Warning	Entre em contato com uma IASD.
Battery Problem	Battery Fault	Battery condition poor or battery charger issue	Warning	Inspect battery condition and connections. Contact IASD if needed.
CHARGER MISSING AC	Carregador sem CA	LED amarelo aceso em qualquer estado.	Warning	Entre em contato com uma IASD.
CHARGER WARNING	Charger Warning	Yellow LED illuminated in any state.	Warning	Entre em contato com uma IASD.
CONTROLLER FAULT	Anomalia no controlador	Falha do controlador.	Shutdown	Entre em contato com uma IASD.
Controller Fault	Control Module Failure	Internal controller fault detected	Shutdown	Contact IASD for assistance
DOWNLOAD FAILURE	Falha na importação	Falha de download.	Warning	Verifique o ficheiro e tente novamente.
EMERGENCY STOP	Paragem de emergência	Paragem de emergência ativada.	Shutdown	Entre em contato com uma IASD.
EXERCISE SET ERROR	Erro de definição de exercício	Erro de definição do funcionamento de teste.	Warning	Entre em contato com uma IASD.
FIRMWARE ERROR-7	Erro de firmware 7	Erro de firmware.	Shutdown	Entre em contato com uma IASD.
FIRMWARE ERROR-9	Erro de firmware 9	Erro de firmware.	Shutdown	Entre em contato com uma IASD.
FUSE PROBLEM	Problema de fusible	Unit will not start in AUTO with utility loss. (Firmware 1.11 and older only.)	Warning	Comprobar el fusible de 7.5 A; sustituir con fusible ATO de 7.5 A si está fundido, o contactar un IASD
HIGH TEMPERATURE	Temperatura elevada	Unit shuts down during operation.	Shutdown	Inspecione a ventilação ao redor do gerador, admissão, exaustão e parte traseira. Se não existirem obstruções, entre em contato com uma IASD.
High Temperature	Overheat	Engine operating temperature too high	Shutdown	Inspect ventilation around generator, intake, exhaust, and rear. Ensure no obstructions present.
INSPECT BATTERY	Inspect Battery	Yellow LED illuminated in any state.	Warning	Inspect battery. Press ENTER to clear.
LOW BATTERY	Low Battery	Yellow LED illuminated in any state.	Warning	Desactivar la alarma; comprobar batería en BATTERY MENU; si GOOD contactar un IASD, si CHECK BATTERY sustituir la batería
LOW OIL PRESSURE	Pressão de óleo baixa	Unit will not start in AUTO with utility loss.	Shutdown	Verifique o nível de óleo e adicione óleo se necessário. Se o nível estiver correto, entre em contato com uma IASD.
LOW VOLTS REMOVE LOAD	Voltaje bajo, retirar carga	Unit will not start in AUTO with utility loss.	Shutdown	Desactivar la alarma, retirar cargas domésticas, poner en AUTO y reanudar
Low Battery	Battery Voltage Low	Starting battery voltage below acceptable level	Warning	Inspect battery and battery cables. Charge or replace battery if necessary.
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.
MISWIRE	Miswire / Wiring Error	Unit will not start in AUTO with utility loss.	Shutdown	Contactar un IASD
NOT ACTIVATED	Não ativado	Unit will not start in AUTO with utility loss.	Warning	Refer to activation section in owners manual
OVERCRANK	Overcrank	Unit will not start in AUTO with utility loss.	Shutdown	Verifique se a válvula de corte da linha de combustível está ligada. Apague o alarme. Inicie em MANUAL. Se não iniciar, entre em contato com uma IASD.
OVERLOAD REMOVE LOAD	Sobrecarga, retirar carga	Unit shuts down during operation.	Shutdown	Desactivar la alarma, retirar cargas domésticas, poner en AUTO y volver a poner en marcha
OVERLOAD WARNING	Aviso de sobrecarga	Aviso de sobrecarga.	Warning	Remova as cargas domésticas do gerador.
OVERSPEED	Sobrevelocidad	Unit will not start in AUTO with utility loss.	Shutdown	Entre em contato com uma IASD.
OVERVOLTAGE	Tensão excessiva	Unit will not start in AUTO with utility loss.	Shutdown	Entre em contato com uma IASD.
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.
Overload	Overload Detected	Electrical load exceeds generator capacity	Shutdown	Remove household electrical loads from generator
Overspeed	RPM Overspeed	Engine running at excessive RPM	Shutdown	Contact IASD for assistance
Overvoltage	Output Voltage High	Generator voltage exceeding nominal rating	Shutdown	Reduce electrical load and restart. Contact IASD if issue persists.
RPM SENSE LOSS	RPM Sense Loss	Unit was running and shuts down, attempts to restart	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	Servicio A	Yellow LED illuminated, maintenance due	Warning	Realize a manutenção SERVICE A. Pressione ENTER para apagar.
SERVICE B	Servicio B	Yellow LED illuminated, maintenance due	Warning	Realize a manutenção SERVICE B. Pressione ENTER para apagar.
STEPPER OVERCURRENT	Stepper Overcurrent	Unit will not start in AUTO with utility loss.	Shutdown	Entre em contato com uma IASD.
UNDERSPEED	Underspeed	Unit will not start in AUTO with utility loss.	Shutdown	Entre em contato com uma IASD.
UNDERVOLTAGE	Undervoltage	Unit will not start in AUTO with utility loss.	Shutdown	Entre em contato com uma 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.
Underspeed	Engine Speed Too Low	Engine RPM below nominal specification	Shutdown	Contact IASD for assistance
Undervoltage	Output Voltage Low	Generator voltage below nominal rating	Shutdown	Reduce electrical load and restart. Contact IASD if issue persists.
WIRING ERROR	Erro de fiação	A unidade não inicia em AUTO com perda de energia da rede elétrica.	Shutdown	Entre em contato com uma IASD.
Wiring Error	Electrical Wiring Fault	Wiring configuration error detected	Shutdown	Contact IASD for assistance

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

Remove spark plug wire(s) and position away from spark plug(s).
Remove spark plug(s).
Remove the four screws attaching 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 units) or 13 mm wrench (20-24 kW units).
Turn pivot ball stud using a 14 mm wrench (10 kW) or 10 mm hex key (20-24 kW) while checking clearance with a feeler gauge.
Hold pivot ball stud and tighten rocker arm jam nut.
Inspect valve clearance to verify it did not change.
Install new valve cover gasket and valve cover; tighten fasteners in a cross pattern.
Install spark plug(s) and tighten to 18 ft-lbs (25 Nm); attach spark plug wires.
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.

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'.

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.

Valve Lash Adjustment adjustment

⚠ Make sure the engine is at 60 to 80 F (16 to 27 C).

⚠ Hold the rocker arm jam nut in place as the pivot ball stud is turned.

⚠ Start all four screws before tightening.

Tools: 10 mm Allen wrench (530 cc engine), 13 mm Allen wrench (410, 990 and 999 cc engines), feeler gauge, socket wrench

Ensure engine is cool before checking; if clearance is 0.002-0.004 in (0.05-0.1 mm), adjustment is not needed.
Remove spark plug wires and position wires away from plugs; remove spark plugs.
Ensure piston is at Top Dead Center of its compression stroke (both valves closed).
Remove the four screws attaching the valve cover.
Loosen the rocker jam nut; turn the pivot ball stud while checking clearance with a feeler gauge.
Hold the pivot ball stud in place with the Allen wrench and tighten the rocker arm jam nut to 174 in-lb (19.68 N-m).
Recheck valve clearance to make sure it did not change.
Install new valve cover gasket and re-attach the valve cover.
Torque fasteners to 6-9 ft/lb (8-12 Nm).
Install spark plugs. Torque to 15-18 ft/lb (20-25 Nm).
Re-attach the spark plug wire to the spark plug.
Repeat the process for the other cylinder, if necessary.

Verificar a folga das válvulas adjustment

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

⚠ Partida acidental. Desconecte o cabo negativo da bateria primeiro.

Tools: Calibrador, Chave de soquete, Soquete grande

Feche a válvula de combustível e desconecte a bateria para evitar inicialização acidental.
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 (ambas as válvulas fechadas).
Verifique a folga entre o braço oscilante (E) e a haste da válvula (F) com um calibrador.
Instale a nova junta e a tampa da válvula; aperte os fixadores em padrão transversal.

Vérification du jeu des soupapes adjustment

⚠ Le moteur doit être froid avant la vérification.

Tools: Clé à douille, Jauge d'épaisseur

Fermer la vanne de carburant et débrancher la batterie pour éviter un démarrage accidentel.
Retirer les fils des bougies d'allumage et les écarter.
Retirer les bougies d'allumage.
Amener le piston au point mort supérieur (PMS) de sa course de compression.

Comprobaciones eléctricas de voltaje diagnostic

⚠ Electrocución: hay alto voltaje presente en el interruptor de transferencia y los terminales.

Tools: Voltímetro de CA calibrado, Frecuencímetro, Manómetro de gas

Verifique que el generador esté apagado.
Ajuste el disyuntor principal del generador en OFF (ABIERTO).
Apague todos los disyuntores/cargas que serán alimentados por el generador.
Conecte la fuente de alimentación del servicio público al interruptor de transferencia.
Compruebe con voltímetro de CA el voltaje entre N1 y N2 (240 VCA nominal).
Compruebe el voltaje N1-neutro y N2-neutro (120 VCA nominal).
Apague el suministro de servicio público cuando confirme voltajes compatibles.
Pulse MANUAL; el motor arrancará. Registre la presión del gas durante los giros de arranque.
Deje calentar el motor cinco minutos y ajuste el MLCB en ON (CERRADO). Registre la presión del gas durante el funcionamiento.
Conecte voltímetro y frecuencímetro entre E1 y E2; el voltaje debe ser 238-242 V con 59,5-60,5 Hz.
Mida E1-neutro y E2-neutro; deben indicar 119-121 VCA.
Ajuste el MLCB en OFF (ABIERTO).
Pulse el botón OFF del generador; el motor parará.

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	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
	23 (White #5)	E	Transfer Control Signal Wire
	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.
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	194 (Red #4)	D	DC (+) 12 VDC for Transfer Controls
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	T1 (White #3)	B	Fused 120VAC for Battery Charger
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	N1 & N2 (Yellow #1 & #2)	A	Sensing for Utility Dropout and Pickup
240 VCA	N1 y N2	AMARILLO Núm. 1 y Núm. 2	Detección de desenganche y activación del servicio público
DC	0 (Black #3)	C	DC (-) Common Ground Wire

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

What is the oil capacity of the Generac Inline 4?

The Generac Inline 4 engine has an oil capacity of 5.25 liters.

What is the displacement of the Generac Inline 4?

The Generac Inline 4 has a displacement of 2.4 liters with 4 cylinders.

Which generators use the Generac Inline 4 engine?

The Generac Inline 4 powers 6 generator set(s), including Generac In Line 4, Generac QT022, Generac QT025, Generac QT027, Generac QT036.

How often should you change the oil in the Generac Inline 4?

The Generac Inline 4 oil change interval is every 100 hours.

What is a common problem with the Generac Inline 4 engine?

A commonly reported issue on generators using the Generac Inline 4 is: Engine cranks but won't start. Cause: 1. Out of fuel. 2. Fuel solenoid (FS) is defective 3. Open Wire #14A from Engine Control circuit board. 4. Spark plugs defective. 5. Door on tank not closed.. Fix: 1. Replenish fuel. 2. Replace solenoid.* 3. Reconnect wire. 4. Clean, regap or replace plugs. 5. Close door on tank..