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Caterpillar C18 ACERT Engine

Name: Caterpillar C18 ACERT Engine
Brand: Caterpillar

The Caterpillar C18 ACERT is a 18.1 L 6-cylinder ta, tta engine rated at 1800 rpm, producing up to 448 kW. It powers generator sets from Caterpillar, including the AD45, C18 and X01140. It holds 26.9 L (7.1 gal) of oil and 26.9 L (7.1 gal) of coolant.

Also known as: Caterpillar C18 ACERT

18.1 L

Displacement

Cylinders

1800 rpm

Rated speed

448 kW

Gross power

On this pageService parts Specs Generator sets Maintenance Filter cross-reference FAQ Service intervals Torque & specs Fluids

Service parts for the C18 ACERT

The cheapest captured merchant offer per filter — see the full cross-reference below for every OEM/aftermarket option.

Air intake

1 required

1063973Air filter$39.31eBay

Fuel system

2 required

1165436Fuel filtersee priceAmazon

1165436Fuel filter (secondary)see priceAmazon

Oil system

1 required

3890434Oil filter$30.97PartsGeek

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

Engine specifications

Oil capacity	26.9 L
Coolant capacity	26.9 L
Displacement	18.1 L
Cylinders	6
Aspiration	TA, TTA
Rated speed	1800 rpm
Gross power	448 kW

Generator sets powered by this engine

Caterpillar AD45Caterpillar C18 Caterpillar C18 ACERT Caterpillar X01140 Caterpillar XQ1140 Caterpillar XQ570

How to read your Caterpillar engine serial & model number →

Maintenance schedule

Item	Spec	Capacity	Part #	Interval
Air filter	500-hour oil change intervals		—	500 hr
Fuel filter	500-hour oil change intervals		—	500 hr
Oil filter	500-hour oil change intervals		3890434	500 hr	Amazon $148.00 eBay $82.42 PartsGeek $30.97
Battery	500-hour oil change intervals		—	500 hr
Belt	500-hour oil change intervals		—	500 hr
Coolant	500-hour oil change intervals	100.7 L	—	500 hr
Oil	500-hour oil change intervals	74.0 L	—	500 hr
Spark plug	500-hour oil change intervals		—	500 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	Notes
Primary air filter element	Change	250 hr	When changing the primary element at 250 operating hours (basis of the without-indicator filter-change comparison)
engine	Other	500 hr	Cat compact diesel lineup offers 500-hour maintenance intervals and single-side service access
oil	Change	500 hr	3000 Series service intervals increased to 500 hours as standard (3013C, 3024C, 3054, 3056)
Secondary air filter element	Change	750 hr	When changing the secondary element at 750 operating hours (basis of the without-indicator filter-change comparison)
minor overhaul	Other	20000 hr	3600 engines designed to run 20 000 hours between minor overhauls using No. 2 fuel
major overhaul	Other	40000 hr	3600 engines designed to run 40 000 hours between major overhauls using No. 2 fuel
cylinder liners and pistons	Other	80000 hr	3600 cylinder liners and pistons designed for 80 000 hours using No. 2 fuel

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
Other	Air compressor air flow	374	L/min (13.2 cfm) @ 1250 rpm	C7 ACERT, C9 ACERT
Other	Air compressor air flow	445	L/min (15.7 cfm) @ 1250 rpm	C11 ACERT, C13 ACERT, C15 ACERT, C18 ACERT
Other	Air compressor air flow	467	L/min (16.5 cfm) @ 1250 rpm	C7 ACERT, C9 ACERT
Other	Air compressor air flow	889	L/min (31.4 cfm) @ 1250 rpm	C11 ACERT, C13 ACERT, C15 ACERT, C18 ACERT
Other	Arr. Number	3149714
Other	Bore	145.0	mm (5.71 in)
Other	Compression ratio	16.3:1
Other	Displacement	18.1	L (1,104.53 in3)
Other	Emissions certification	U.S. EPA Tier 2 and CARB; FM approved; UL listed - US and Canada; Meets NFPA 20 requirements
Other	Engine dimension (1) Length	1889.0	mm (74.37 in)	Do not use for installation design
Other	Engine dimension (2) Width	1091.0	mm (42.95 in)	Do not use for installation design
Other	Engine dimension (3) Height	1379.7	mm (54.32 in)	Do not use for installation design
Other	Feature Code	C18DF03
Other	Net dry weight (approximate)	1769	kg (3900 lb)
Other	Performance Number	EM0022-01
Other	Radiator cooling package maximum elevation	1524	m (5000 ft)	with 50/50 water/Extended Life Coolant mixture
Other	Rating condition (diesel 7 L and higher)	99 kPa (29.31 in Hg) dry barometer, 25°C (77°F)		SAE J1995 inlet air standard
Other	Rating condition (diesel up to 6.6 L)	100 kPa (29.5 in Hg) total barometric pressure, 1 kPa (.295 in Hg) vapor pressure, 25°C (77°F)		ISO/TR14396 inlet air standard
Other	Rating condition (gas)	100 kPa (29.61 in Hg) and 25°C (77°F)		SAE J1349 standard
Other	Rating condition - inlet air standard conditions	99 kPa (29.31 in. Hg) dry barometer
Other	Stroke	183.0	mm (7.2 in)
Other	Weight, Net Dry (approximate)	1673	kg (3688 lb)
Other	Weight, Net Dry (approximate)	1769	kg	approximate
Pressure	Unit injector fuel injection pressure	1240	bar (18 000 psi)
Speed	Rated engine speed	2100	rpm	rated power 597 kW / 800 bhp
Speed	Rotation (from flywheel end)	Counterclockwise
Temperature	Radiator cooling package design ambient temperature	48.9	°C (120°F)	coolant mixture 50/50 (water/Caterpillar Extended Life Coolant), maximum elevation 1524 m (5000 ft)
Temperature	Rating condition - inlet air temperature	25	degC (77 degF)
Torque	Air compressor SAE "A" hydraulic pump drive maximum torque (374 L/min and 467 L/min compressors)	60	N•m (44 lb-ft)	C7, C9 ACERT
Torque	Air compressor maximum torque (374 L/min / 13.2 cfm @ 1250 rpm, C7/C9)	60	N·m (44 lb-ft)	374 L/min (13.2 cfm) @ 1250 rpm
Torque	Air compressor maximum torque (467 L/min / 16.5 cfm @ 1250 rpm, C7/C9)	60	N·m (44 lb-ft)	467 L/min (16.5 cfm) @ 1250 rpm

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	Notes
Coolant	50/50 (water/Caterpillar Extended Life Coolant)		below 48°C	Radiator cooling packages designed for up to 48.9°C (120°F) ambient up to a maximum elevation of 1524 m (5000 ft)
Coolant	50/50 mixture water/Caterpillar Extended Life Coolant		below 48°C	Radiator cooling packages designed for up to 48.9° C (120° F) ambient; coolant sump refill capacities vary by oil sump/pan (18 L to 106 L service refill with new oil filter change)
Coolant	Cat DEAC			Diesel; 3,000 Service Hours or Three Years; annual S·O·SSM Level 2 coolant sampling and analysis
Coolant	Cat ELC			Diesel; 12,000 Service Hours or Six Years; add Cat ELC Extender at 6,000 service hours or one half of service life; annual S·O·SSM Level 2 coolant sampling and analysis
Coolant	Cat NGEC			Natural Gas; 16,000 Service Hours or Three Years; use interval that occurs first
Engine oil	Cat NGEO			Natural Gas
Engine oil	low sulfated ash oil			Required for U.S. EPA Tier 4 Final, EU Stage IV engines.
Engine oil	Cat Arctic DEO SYN SAE 0W-30		-40°C to 30°C	Engine Crankcase; Industrial Engines
Engine oil	Cat DEO SYN SAE 5W-40		-30°C to 50°C	Engine Crankcase; Industrial Engines
Engine oil	Cat DEO SAE 10W-30		-18°C to 40°C	Engine Crankcase; Industrial Engines
Engine oil	Cat DEO SAE 15W-40		-9°C to 50°C	Engine Crankcase; Industrial Engines
Fuel		Ultra Low Sulfur Diesel (ULSD)		Contains less than or equal to 15 parts per million sulfur (mg/kg); required for U.S. EPA Tier 4 Final, EU Stage IV engines. B20 biodiesel capability available.
Fuel	35 API gravity			Standard fuel with lower heating value of 42,780 kJ/kg (18,390 btu/lb) when used at 29 C (84.2 F) with a density of 838.9 g/L
Fuel	35° API gravity at 60°F (16°C)	LHV 18,390 Btu/lb (42 780 kJ/kg)		Fuel at 85°F (29°C) weighing 7.001 lbs/U.S. gal (838.9 g/liter)
Fuel	No. 2 fuel			3600 engines designed for 80 000 hours on No. 2 fuel; ratings based on API gravity of 35 at 15 C (60 F), LHV of 42 780 kJ/kg used at 29 C (84 F) with a density of 838.9 g/L
Grease	Cat Generator Set Grease			Part Number 108-8611

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

Filters for this engine

Air filter: Caterpillar 1063973 Caterpillar 1327169 Caterpillar 1236856 Caterpillar 30009151 Caterpillar 2310167 Caterpillar 6I0274 Donaldson P533884 Donaldson P538007
Fuel filter: Caterpillar 1165436 Caterpillar 3089679 Caterpillar 3890433 Donaldson P550625 Donaldson P551311 Donaldson P551316 Wix 33640 Wix 33674NP
Fuel filter (secondary): Caterpillar 1165436 Caterpillar 3089679 Donaldson P550625 Donaldson P551311 Wix 33640 Wix 33674NP
Oil filter: Caterpillar 3890434 Donaldson P551808 Wix 57792

Cross-referenced via Donaldson + OEM/engine-maker interchange — options to verify against your serial number, not confirmed for every exact variant.

Also used in

Caterpillar 385C — Excavator Tracked
Caterpillar 385CL — Excavator Tracked
Caterpillar 385CMHPU — Power Unit
Caterpillar 390F — Excavator Tracked
Caterpillar 390FL — Excavator Tracked
Caterpillar 651 — Tractor
Caterpillar 657 — Tractor
Caterpillar 772 — Dump Truck
Caterpillar 836H — Compactor
Caterpillar D9 — Dozer Tracked
Caterpillar D9T — Tractor Tracked
New Holland FR9080 — Harvester

Other equipment known to use this engine, via filter-application cross-reference — useful for sourcing parts even when your exact machine isn't listed elsewhere on this page.

Common questions

What is the oil capacity of the Caterpillar C18 ACERT?

The Caterpillar C18 ACERT engine has an oil capacity of 26.9 liters.

What is the displacement of the Caterpillar C18 ACERT?

The Caterpillar C18 ACERT has a displacement of 18.1 liters with 6 cylinders.

Which generators use the Caterpillar C18 ACERT engine?

The Caterpillar C18 ACERT powers 6 generator set(s), including Caterpillar AD45, Caterpillar C18, Caterpillar C18 ACERT, Caterpillar X01140, Caterpillar XQ1140.

What oil filter does the Caterpillar C18 ACERT use?

The Caterpillar C18 ACERT uses oil filter part numbers Caterpillar 3890434, Donaldson P551808, Wix 57792.

What fuel filter does the Caterpillar C18 ACERT use?

The Caterpillar C18 ACERT uses fuel filter part numbers Caterpillar 1165436, Caterpillar 3089679, Caterpillar 3890433.

What air filter does the Caterpillar C18 ACERT use?

The Caterpillar C18 ACERT uses air filter part numbers Caterpillar 1063973, Caterpillar 1327169, Caterpillar 1236856.

How often should you change the oil in the Caterpillar C18 ACERT?

The Caterpillar C18 ACERT oil change interval is every 500 hours.