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2.4L Engine

The 2.4L is a 2.4 L engine rated at 1800 rpm. It powers generator sets from Generac and Teksan, including the 2.4 L and TJUG25. It holds 3.8 L (1.0 gal) of oil and 9.5 L (2.5 gal) of coolant.

Also known as: 2.4L

2.4 L

Displacement

1800 rpm

Rated speed

3.8 L

Oil capacity

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

Engine specifications

Oil capacity	3.8 L
Coolant capacity	9.5 L
Displacement	2.4 L
Rated speed	1800 rpm

Generator sets powered by this engine

Shared across brands: Generac, Teksan

Generac 2.4 L Teksan TJUG25

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.
Fix: 1. Clean or replace as needed. 2. Unclog fuel line. 3. Clean, regap or replace plugs. 4. Confirm fuel pressure to regulator is as recommended in SPECIFICATIONS.
Engine oil level is low.
Cause: 1. Engine is overheated. 2. Defective Low Oil Pressure Switch 3. Defective Coolant Temperature Switch 4. Defective Control Module circuit board 5. Coolant Level is Low. 6. Defective Low Coolant Level Switch
Fix: 1. Check cooling system for leaks. 2. Replace switch.* 3. Replace switch.* 4. Replace board.* 5. Repair leak - Add coolant. 6. Replace Switch.*
Engine starts then shuts down.
Cause: AUTO/OFF/MANUAL Switch at OFF, engine continues to run
Fix: *Contact the nearest Authorized Dealer for assistance.
No AC output from generator.
Cause: Defective AUTO/OFF/MANUAL switch Open/disconnected wire #15A between AUTO/OFF/MANUAL switch and Control Module circuit board.
Fix: 1. Replace switch.* 2. Reconnect/close wire.
Overcrank Shutdown EngProt001
Fix: Overcrank LED will turn ON. Turn OFF the AUTO/OFF/MANUAL switch, then turn switch back to AUTO to reset the generator control 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
Maintenance Required 99
High Coolant Temperature Switch Safety004
Fix: Generator will automatically restart and the LED will reset once the temperature has returned to a safe operating level
Engine is overheated. 5
Defective Low Oil Pressure Switch 6
Defective Low Coolant Level Switch 10
Defective Coolant Temperature Switch 7

Compiled from service & troubleshooting documentation across every generator set that uses the 2.4L.

Maintenance schedule

Item	Spec	Capacity	Part #	Interval
Air filter			—	30 hr
Oil filter	Full Flow Spin-on Cartridge		—	30 hr
Battery	Group 24F, 12 Volt; max dimensions 273 mm x 173 mm x 229 mm		058208S	1800 hr	eBay
Belt			—	1000 hr
Coolant	Generac 50/50 ethylene glycol type; do not use propylene glycol	9.5 liters	—	5040 hr
Oil	5W-20 (Generac proprietary 5W-20 Synthetic after 30 hour break-in)	3.8 liters	—
Spark plug	Gap 1.07-1.17 mm (2.4L), 0.9 mm (1.5L), 0.71 mm (32/38 kW, 60 kW)		—	3600 hr

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
Engine oil	Change	25 hr		First service — After the 25 hour break-in period, use Generac 5W-20 GEO for continuous use
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
Coolant Level and Hoses	Check	125 hr	12 mo	Schedule A; also daily if running continuously
Enclosure Louvers	Check	125 hr	12 mo	Schedule A; also daily if running continuously
Fuel Lines	Check	125 hr	12 mo	Schedule A; also daily if running continuously
Lubricating Oil Level and Drain Hose	Check	125 hr	12 mo	Schedule A; also daily if running continuously
Lubricating Oil and Oil Filter	Replace	125 hr	12 mo	First service — Schedule A
Radiator for Clogging	Check	125 hr	12 mo	Schedule A; also daily if running continuously
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)

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
Clearance	Auto-tensioner rod projection length	12	mm
Clearance	Auto-tensioner rod protrusion (after installation check)	3.8 - 4.5	mm
Clearance	Auto-tensioner rod pushed-in amount (force 98-196 N)	1.0 or less	mm	pushed with 98 - 196 N
Clearance	Belt deflection	3/8 - 5/8	in	22 Ibs (10 kgf) force midway between water pump and alternator pulleys
Clearance	Belt deflection	7.6 - 12.7	mm	22 Ibs (10 kgf) force midway between water pump and alternator pulleys
Clearance	Camshaft cam height - Exhaust	36.83	mm	standard; min 36.33
Clearance	Camshaft cam height - Intake	37.39	mm	standard; min 36.89
Clearance	Connecting rod big end side clearance	0.10 - 0.25	mm	limit 0.4
Clearance	Crankshaft end play	0.05 - 0.18	mm	limit 0.25
Clearance	Crankshaft journal oil clearance	0.02 - 0.04	mm	limit 0.1
Clearance	Crankshaft journal outside diameter	57.0	mm
Clearance	Crankshaft pin oil clearance	0.02 - 0.05	mm	limit 0.1
Clearance	Crankshaft pin outside diameter	45.0	mm
Clearance	Cylinder block flatness of gasket surface	0.05	mm	limit 0.1
Clearance	Cylinder block inside diameter - 4G63-L-5A/5B	85-85.03	mm
Clearance	Cylinder block inside diameter - 4G64-L-56/57	86.5-86.53	mm
Clearance	Cylinder block overall height - 4G63-L-5A/5B	284±0.1	mm
Clearance	Cylinder block overall height - 4G64-L-56/57	290±0.1	mm
Clearance	Cylinder head bolt shank length	97.4	mm	limit 99.4
Clearance	Cylinder head flatness of gasket surface	Less than 0.03	mm	limit 0.2
Clearance	Cylinder head overall height	119.9~120.1	mm
Clearance	Cylindricity	0.01	mm
Clearance	Oil pump side clearance - Drive gear	0.08 - 0.14	mm
Clearance	Oil pump side clearance - Driven gear	0.06 - 0.12	mm
Clearance	Piston outside diameter	86.5 /85	mm
Clearance	Piston pin outside diameter	22.0	mm
Clearance	Piston ring side clearance - No. 1	0.02 - 0.06	mm	limit 0.1
Clearance	Piston ring side clearance - No. 2	0.02 - 0.06	mm	limit 0.1
Clearance	Valve guide hole diameter - 0.05 oversize	11.05 - 11.07	mm
Clearance	Valve guide inside diameter	6.0	mm
Clearance	Valve guide projection from cylinder head upper surface	14.0	mm
Clearance	Valve overall height - Exhaust	114.11	mm	min 113.61
Clearance	Valve overall height - Intake	112.30	mm	min 111.80
Clearance	Valve seat ring hole diameter - Intake 0.3 oversize	34.435-34.455	mm
Clearance	Valve seat valve contact width	0.9 - 1.3	mm
Clearance	Valve spring free length	54.75	mm	min 53.75
Clearance	Valve stem outside diameter	6.0	mm
Clearance	Valve stem projection	49.3	mm	limit 49.8
Clearance	Valve stem to valve guide clearance - Exhaust	0.03 - 0.07	mm	limit 0.15
Clearance	Valve stem to valve guide clearance - Intake	0.02 - 0.05	mm	limit 0.10
Clearance	Valve thickness of valve head (margin) - Exhaust	1.2	mm	min 0.7
Clearance	Valve thickness of valve head (margin) - Intake	1.0	mm	min 0.5
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	Piston ring end gap - No. 1	0.25 - 0.35	mm	limit 0.8
Gap	Piston ring end gap - No. 2	0.40 - 0.55	mm	limit 0.8
Gap	Piston ring end gap - Oil ring side rail	0.10 - 0.40	mm	limit 1.0
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 (1.5L engines, 25/30 kW)	0.9	mm
Gap	Spark Plug Gap (2.4L engines, 22/27/36/45 kW)	1.07-1.17	mm
Gap	Spark Plug Gap (32/38 kW and 60 kW)	0.71	mm

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
Coolant	50/50 ethylene glycol	Generac 50/50 ethylene glycol type coolant		9.5 liters	Use demineralized or distilled water; do not use propylene glycol. Coolant mix 40-60% volume.
Coolant	50/50 mixture of antifreeze and water; long life type, typically bright orange	GM6277M	above -37°C		Minimum boiling point 300F (149c), freezing point no higher than -34F (-37c). Do not add plain water. Do not use stop leak additives.
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	Generac proprietary 5W-20 Synthetic (after 30 hour break-in)		3.8 liters	Factory filled with 5W-20; 60 kW capacity 5.25 quarts (5 liters). Do not use special additives.
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	API SM or newer	GM6094M			Use oils displaying API "Starburst" Certification Mark 'FOR GASOLINE ENGINES'. Oils for Heavy Duty or Natural Gas Engines are not acceptable. Supplemental additives not recommended.
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	HD-5 or HD-10 specification LPG				For LPG engines. Gasoline engines should use 87 octane or higher; E85 not permitted.
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 at least 1,000 BTUs per cubic foot; LPV at least 2,520 BTUs per cubic foot			250.0 gallons	Minimum LP tank size 250 gallons (946 liters) if converting to LPV from NG
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.

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.
DTC 107	MAP voltage low	SPN 106:FMI 4. MAP voltage less than 0.050 with throttle position greater than 2.0% and engine RPM less than 3000. MIL-ON, Adaptive-Disabled.	Warning	Check MAP sensor connector C006, 5V reference pin 3 and signal pin 4; check continuity to ECM pins 7, 19, 20
DTC 108	MAP pressure high	SPN 106:FMI 16. MAP greater than 17.00 psia with TPS less than 8.0% and engine rpm greater than 800. MIL-ON, Adaptive Learn disabled.	Warning	Check MAP sensor connector C006, mechanical vacuum connection; check continuity to ECM
DTC 11	Intake cam / distributor position error	SPN 520800:FMI 7. Cam position error; difference between desired and actual CAM position greater than 30 CAD with engine RPM greater than 500.	Warning	Check CAM position sensor; CAM position is not adjustable; sensor located on front of timing cover
DTC 111	IAT higher than expected stage 1	SPN 105:FMI 15. Intake Air Temperature greater than 200 degrees F. with engine rpm greater than 600, present for minimum 60 seconds. MIL-ON, Adaptive-Disabled, Derate level 1.	Warning	Ensure air inlet not obstructed; inspect air inlet system for cracks or breaks
DTC 1111	RPM above fuel rev limit level	SPN 515:FMI 16. Engine rpm greater than set limit (generally 3000 rpms). MIL-ON during active fault.	Warning	Check for other DTCs; check ECM service part number calibration; check mechanical operation of throttle; check for manifold vacuum leaks
DTC 1112	RPM above spark rev limit level	SPN 515:FMI 0. Engine rpm greater than set limit (generally 3200 rpms). MIL-ON during active fault, Engine Shut Down.	Shutdown	Check for other DTCs; check ECM service part number calibration; check mechanical operation of throttle; check for manifold vacuum leaks
DTC 112	IAT voltage low	SPN 105:FMI 4. IAT Sensor Voltage less than 0.050. MIL-ON during active fault, Adaptive-Disabled.	Warning	Check TMAP sensor; check continuity between TMAP pins and ECM
DTC 1121	FPP1/2 simultaneous voltages out-of-range (redundancy)	SPN 91:FMI 31. FPP1 and FPP 2 redundancy lost. MIL-ON, Force idle, Low rev limit.	Warning	Diagnose lower numerical codes first; follow charts for DTC 2126 and DTC 2121; inspect FPP and C012 connector pins
DTC 1122	FPP1/2 do not match each other or IVS (redundancy lost)	SPN 520250:FMI 31	Warning
DTC 113	IAT voltage high	SPN 105:FMI 3. IAT Sensor Voltage greater than 4.950 volts. MIL-ON during active fault, Adaptive-Disabled.	Warning	Check TMAP sensor connector C006; jump pins 1 and 2; check continuity to ECM pins 39, 20
DTC 1151	Closed-loop LPG high	SPN 520206:FMI 0. Closed Loop multiplier out of range (greater than 35%). MIL-ON.	Warning	Check air intake duct, air filter, EGO 1 sensor wiring, ECM grounds, fuel system diagnostics
DTC 1152	Closed-loop LPG low	SPN 520206:FMI 1. Closed Loop multiplier out of range (at limit of -35%). MIL Disabled.	Warning	Check fuel system (high secondary fuel pressure, worn fuel mixer, faulty EPR); check fuel quality; check air filter
DTC 1153	Closed-loop NG high	SPN 520207:FMI 0	Warning
DTC 1154	Closed-loop NG low	SPN 520207:FMI 1	Warning
DTC 1155	Closed-loop gasoline bank1 high	SPN 520204:FMI 0. Closed Loop multiplier out of range (greater than 35%). MIL-ON.	Warning	Check air intake duct, air filter, EGO 1 sensor wiring, ECM grounds, fuel system diagnostics
DTC 1156	Closed-loop gasoline bank1 low	SPN 520204:FMI 1. Adaptive multiplier out of range greater than -30%. MIL-ON.	Warning	Check fuel pressure, injectors, fuel quality, air filter
DTC 1157	Closed-loop gasoline bank2 high	SPN 520205:FMI 0	Warning
DTC 1158	Closed-loop gasoline bank2 low	SPN 520205:FMI 1	Warning
DTC 116	ECT higher than expected stage 1	SPN 110:FMI 15. Engine Coolant Temperature greater than 215 degrees F. for greater than 5 seconds. MIL-On, Power derate (level 2), Adaptive-Disabled.	Warning	Power derate level two enforced limiting maximum throttle position to 20%
DTC 1161	Adaptive-learn LPG high	SPN 520202:FMI 0. Adaptive multiplier out of range greater than 30%. MIL-ON.	Warning	Check air intake duct, air filter, EGO 1 sensor wiring, ECM grounds, fuel system diagnostics
DTC 1162	Adaptive-learn LPG low	SPN 520202:FMI 1. Adaptive multiplier out of range greater than -30%. MIL-ON.	Warning	Check secondary fuel pressure, fuel mixer, EPR, fuel quality, air filter
DTC 1163	Adaptive-learn NG high	SPN 520203:FMI 0	Warning
DTC 1164	Adaptive-learn NG low	SPN 520203:FMI 1	Warning
DTC 1165	Catalyst inactive on LPG	SPN 520213:FMI 10. EGO 1 signal = EGO 2 signal for 100 updates. MIL-On during active fault and 1 second after. Adaptive- Disabled.	Warning	Diagnose any other troubles; eliminate exhaust leaks prior to replacing catalyst muffler
DTC 1166	Catalyst inactive on NG	SPN 520214:FMI 10	Warning
DTC 117	ECT voltage low	SPN 110:FMI 4. ECT sensor voltage less than 0.050. MIL-ON during active fault, Adaptive-Disabled.	Warning	Check ECT sensor connector C007; check continuity to ECM
DTC 1171	MegaJector delivery pressure higher than expected	SPN 520260:FMI 0. EPR actual pressure greater than 1.5 inches above commanded pressure. MIL-ON during active fault, Adaptive disabled, Closed loop disabled.	Warning	Run fuel system diagnostic pressure check; check EPR electrical connector C018; replace or repair the EPR
DTC 1172	MegaJector delivery pressure lower than expected	SPN 520260:FMI 1	Warning
DTC 1173	MegaJector comm lost	SPN 520260:FMI 31	Warning
DTC 1174	MegaJector voltage supply high	SPN 520260:FMI 3	Warning
DTC 1175	MegaJector voltage supply low	SPN 520260:FMI 4	Warning
DTC 1176	MegaJector internal actuator fault detection	SPN 520260:FMI 12	Warning
DTC 1177	MegaJector internal circuitry fault detection	SPN 520260:FMI 12	Warning
DTC 1178	MegaJector internal comm fault detection	SPN 520260:FMI 12	Warning
DTC 118	ECT voltage high	SPN 110:FMI 3. ECT sensor voltage exceeds 4.950 volts. MIL-ON during active fault, Adaptive-Disabled.	Warning	Check ECT sensor resistance vs temperature chart; check connector pins A and B; check ECM pins 40 and 20
DTC 1182	Fuel impurity level high	SPN 520401:FMI 0	Warning
DTC 1183	MegaJector autozero / lockoff failure	SPN 520803:FMI 31	Warning
DTC 121	TPS1-2 lower than expected	SPN 51:FMI 1. TPS 1 20% lower than TPS 2. MIL-ON for remainder of key on cycle, Engine shutdown.	Shutdown	Check TPS 1 and TPS 2 voltages; disconnect electronic throttle connector C017; replace electronic throttle
DTC 122	TPS1 voltage low	SPN 51:FMI 4. TPS sensor less than 0.200 volts. MIL-ON during active fault, Engine shutdown.	Shutdown	Check TPS 1 voltage; jump 5V reference pin 3 and TPS 1 signal pin 6; replace electronic throttle
DTC 123	TPS1 voltage high	SPN 51:FMI 3. TPS sensor voltage exceeds 4.800 volts. MIL-ON during active fault, Engine shutdown.	Shutdown	Check TPS 1 voltage; replace electronic throttle
DTC 127	IAT higher than expected stage 2	SPN 105:FMI 0. Intake Air Temperature greater than 210 degrees F. with engine speed greater than 600 rpm, active for 120 seconds. MIL-ON, Engine will shutdown.	Shutdown	Ensure air inlet not obstructed; inspect air inlet system
DTC 129	BP pressure low	SPN 108:FMI 1. BP less than 8.30 psia. MIL-ON for active fault, Adaptive-Disabled.	Warning	Check TMAP sensor connector; jump 5V reference pin 3 and MAP signal pin 4; check continuity
DTC 1311	Cylinder 1 misfire detected	SPN 1323:FMI 11	Warning
DTC 1312	Cylinder 2 misfire detected	SPN 1324:FMI 11	Warning
DTC 1313	Cylinder 3 misfire detected	SPN 1325:FMI 11	Warning
DTC 1314	Cylinder 4 misfire detected	SPN 1326:FMI 11	Warning
DTC 1315	Cylinder 5 misfire detected	SPN 1327:FMI 11	Warning
DTC 1316	Cylinder 6 misfire detected	SPN 1328:FMI 11	Warning
DTC 1317	Cylinder 7 misfire detected	SPN 1329:FMI 11	Warning
DTC 1318	Cylinder 8 misfire detected	SPN 1330:FMI 11	Warning
DTC 134	EGO1 open / lazy	SPN 724:FMI 10. EGO 1 pre catalyst persistently cold for more than 120 seconds. MIL-ON, Adaptive-Disabled, Closed Loop-Disabled.	Warning	Check EGO 1 connector C005; check heater voltage between pins C and D; replace EGO 1 sensor
DTC 140	EGO3 open / lazy	SPN 520209:FMI 10	Warning
DTC 1411	EMWT1 voltage high	SPN 441:FMI 3	Warning
DTC 1412	EMWT2 voltage high	SPN 442:FMI 3	Warning
DTC 1413	EMWT1 voltage low	SPN 441:FMI 4	Warning
DTC 1414	EMWT2 voltage low	SPN 442:FMI 4	Warning
DTC 1415	EMWT1 higher than expected stage 1	SPN 441:FMI 15	Warning
DTC 1416	EMWT2 higher than expected stage 1	SPN 442:FMI 15	Warning
DTC 1417	EMWT1 higher than expected stage 2	SPN 441:FMI 0	Warning
DTC 1418	EMWT2 higher than expected stage 2	SPN 442:FMI 0	Warning
DTC 1419	ERWT1 voltage high	SPN 443:FMI 3	Warning
DTC 1420	ERWT2 voltage high	SPN 444:FMI 3	Warning
DTC 1421	ERWT1 voltage low	SPN 443:FMI 4	Warning
DTC 1422	ERWT2 voltage low	SPN 444:FMI 4	Warning
DTC 1423	ERWT1 higher than expected stage 1	SPN 443:FMI 15	Warning
DTC 1424	ERWT2 higher than expected stage 1	SPN 444:FMI 15	Warning
DTC 1425	ERWT1 higher than expected stage 2	SPN 443:FMI 0	Warning
DTC 1426	ERWT2 higher than expected stage 2	SPN 444:FMI 0	Warning
DTC 1511	AUX analog Pull-Up 1 high voltage	SPN 520216:FMI 3	Warning
DTC 1512	AUX analog Pull-Up 1 low voltage	SPN 520216:FMI 4	Warning
DTC 1513	AUX analog Pull-Up 2 high voltage	SPN 520217:FMI 3	Warning
DTC 1514	AUX analog Pull-Up 2 low voltage	SPN 520217:FMI 4	Warning

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.

Check and Adjust Accessory / Drive Belt adjustment

Tools: Belt deflection gauge

Inspect belt for cracks, fraying, excessive wear or other damage.
Verify belt is free of grease and oil; replace if contaminated.
Using a suitable gauge, apply 22 Ibs (10 kgf) force midway between water pump and alternator pulleys.
Loosen DC alternator tension bracket screw.
Rotate alternator outward to reduce belt deflection.
Rotate inward to increase belt deflection.
Tighten DC alternator tension bracket screw to 17-22 ft-lbs (23-30 Nm).
Recheck belt deflection and repeat steps as necessary.

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'.

Fuel Conversion Procedure from NG to LPV adjustment

⚠ Fuel conversion software is password protected

⚠ Failure to convert both hardware and software violates EPA regulations

Tools: Flat blade screwdriver, Pipe sealant

Turn off the main gas supply.
Remove battery negative cable (black) from battery negative (-) terminal.
Remove carburetor fuel hose from outlet port.
Remove screw at front of power wire connector and pull connector from fuel solenoid.
Expand spring clamp on fuel enrichment hose and remove from hose barb.
Remove black pipe assembly from outlet port; remove fuel solenoid assembly if clearance is insufficient.
Rotate NG fuel jet counterclockwise to remove from outlet port.
Rotate LP fuel jet counterclockwise to remove from jet keeper port.

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.

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
	ECM connector C001 pin 80	MIL side of customer interface connector	MIL power source supplied to lamp; ECM completes circuit to ground to turn lamp ON
	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	194 (Red #4)	D	DC (+) 12 VDC for Transfer Controls
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 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)
12V	ECM pin 45 (switched power)		Check for +12 volts switched power with the ignition key ON
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 VAC	Utility dropout and pickup sensing	YELLOW N1 & N2
240 VCA	N1 y N2	AMARILLO Núm. 1 y Núm. 2	Detección de desenganche y activación del servicio público
5V	DLC connector +5 volts between pin 1 (BLK/LT GRN) and pin 2 (LT GRN RED)		With ignition key in ON position; ECM 5 volt reference circuit powers the diagnostic link cable
5V	ECM 5 volt reference pin 19	TMAP, Electronic Throttle, FPP, Crankshaft Sensor, Camshaft Sensor	External 5 volt 1 supply to sensors
5V	ECM 5 volt reference pin 49	FPP sensor 5 volt supply circuit	External 5 volt 2 supply dedicated to FPP sensor; LT GRN/PPL wire
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 2.4L?

The 2.4L engine has an oil capacity of 3.8 liters.

What is the displacement of the 2.4L?

The 2.4L has a displacement of 2.4 liters.

Which generators use the 2.4L engine?

The 2.4L powers 2 generator set(s), including Generac 2.4 L, Teksan TJUG25.

What is a common problem with the 2.4L engine?

A commonly reported issue on generators using the 2.4L 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..