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Caterpillar C2.2 Engine

Name: Caterpillar C2.2 Engine
Brand: Caterpillar

The Caterpillar C2.2 is a 2.2 L 4-cylinder na, t engine rated at 1800 rpm, producing up to 20.6 kW. It powers generator sets from Caterpillar, including the D18-4, D20 and D20-6. It holds 8.9 L (2.4 gal) of oil and 19.6 L (5.2 gal) of coolant.

Also known as: Caterpillar C2.2

Part of the Caterpillar C2.2 engine family — 3 variants share parts & fitment.

2.2 L

Displacement

Cylinders

1800 rpm

Rated speed

20 kW

Gross power

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

Engine specifications

Oil capacity	8.9 L
Coolant capacity	19.6 L
Displacement	2.2 L
Cylinders	4
Aspiration	NA, T
Rated speed	1800 rpm
Gross power	20 kW

Generator sets powered by this engine

Caterpillar C2.2 Caterpillar D18-4 Caterpillar D20 Caterpillar D20-6 Caterpillar D25-8 Caterpillar D30 Caterpillar DE22E3 Caterpillar XQ20 Caterpillar XQ30

How to read your Caterpillar engine serial & model number →

Maintenance schedule

Item	Spec	Part #	Interval
Air filter	Replaceable Element	—	100 hr
Fuel filter	Replaceable Element	—	100 hr
Oil filter	Replaceable Element	—	100 hr
Belt	Replaceable Element	—	100 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
Fuel Tank Water and Sediment	Drain	50 hr		Every 50 Service Hours or Weekly
Cooling System Coolant Sample (Level 1)	Test	250 hr		Every 250 Service Hours - Obtain
Engine Oil Sample	Test	250 hr		Every 250 Service Hours - Obtain
Battery Electrolyte Level	Check	500 hr	12 mo	Every 500 Service Hours or 1 Year
Belts	Inspect	500 hr		Every 500 Service Hours - Inspect/Adjust
Engine Air Cleaner Element	Replace	500 hr		Every 500 Service Hours
Engine Oil and Filter	Change	500 hr	12 mo	Every 500 Service Hours or 1 Year
Fuel System Primary Filter (Water Separator) Element	Replace	500 hr	12 mo	Every 500 Service Hours or 1 Year
Fuel System Secondary Filter	Replace	500 hr	12 mo	Every 500 Service Hours or 1 Year - replace primary and secondary at the same time
Hoses and Clamps	Inspect	500 hr	12 mo	Every 500 Service Hours or 1 Year - Inspect/Replace
Radiator	Clean	500 hr	12 mo	Every 500 Service Hours or 1 Year
engine	Other	500 hr		Cat compact diesel lineup offers 500-hour maintenance intervals and single-side service access
Alternator and Fan Belts	Replace	1000 hr		Every 1000 Service Hours
Engine Valve Lash	Check	1000 hr		Every 1000 Service Hours
Turbocharger	Inspect	1000 hr		Every 1000 Service Hours
Engine Crankcase Breather Element	Replace	1500 hr		Every 1500 Service Hours
Alternator	Inspect	2000 hr		Every 2000 Service Hours
Engine Mounts	Inspect	2000 hr		Every 2000 Service Hours
Starting Motor	Inspect	2000 hr		Every 2000 Service Hours
Cooling System Coolant (DEAC)	Change	3000 hr	24 mo	Every 3000 Service Hours or 2 Years
Cooling System Water Temperature Regulator	Replace	3000 hr		Every 3000 Service Hours
Exhaust Gas Recirculation Valve	Clean	3000 hr		Every 3000 Service Hours - also clean connecting pipe and exhaust cooler; reset EGR maintenance timer; 100 hours allowed to complete
Water Pump	Inspect	3000 hr		Every 3000 Service Hours
Aftercooler Core	Inspect	4000 hr		Every 4000 Service Hours
Cooling System Coolant Extender (ELC)	Other	6000 hr	36 mo	Every 6000 Service Hours or 3 Years - Add
Cooling System Coolant (ELC)	Change	12000 hr	72 mo	Every 12 000 Service Hours or 6 Years
Cooling System Coolant Sample (Level 2)	Test		12 mo	Every Year - Obtain

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	Fan clearance (A) between cover edge and fan blade tip	10	mm	four cylinder turbocharged engine
Clearance	Fan clearance (A) between cover edge and fan blade tip	5	mm	three cylinder engine
Clearance	Fan clearance (A) between cover edge and fan blade tip	8	mm	four cylinder turbocharged aftercooled engine
Other	Engine rotation (flywheel end)	Counterclockwise
Other	New belt tension	400 to 489	N	new belt
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	Used belt tension	267 to 356	N	used belt in operation 30 minutes or more at rated speed
Pressure	Cooling system filler cap pressure	110	kPa	four cylinder engine
Pressure	Cooling system filler cap pressure	95	kPa	three cylinder engine
Pressure	Engine oil pressure with SAE10W30	207 to 413	kPa	at rated rpm
Pressure	Maximum air pressure for cleaning purposes	205	kPa
Pressure	Maximum water pressure for cleaning purposes	275	kPa
Speed	Overspeed limit (700 RPM above the given speed)	2800	RPM	C1.7 turbocharged; C2.2 turbocharged; C2.2 turbocharged with charge cooler
Temperature	Jacket water coolant temperature typical range	82 to 96	°C
Temperature	Maximum allowable coolant temperature with pressurized cooling system at 90 kPa	112	°C
Torque	Air cleaner service indicator	2	N·m
Torque	Alternator belt adjuster bolt (1) and bolt (2)	25	N·m
Torque	Alternator belt nut (4) and bolt (5)	25	N·m
Torque	Bearing Nut Torque (129-3253 Spanner Socket, 121-9871 Bearing Nut)	2375	N·m
Torque	Bearing Nut Torque (129-3254 Spanner Socket, 119-3711 Bearing Nut)	2375	N·m
Torque	Belts adjust bolt (1), bolt (3), nut and bolt (4)	22	N·m
Torque	Crankcase breather cap assembly	10	N·m
Torque	Fuel filter bowl	10	N·m
Torque	Locknut torque (260-0626 Spanner Socket Assembly, 1T-0229 High Torque Locknut)	985	N·m
Torque	Radiator drain plug (2) three cylinder and (3) four cylinder turbocharged	4	N·m
Torque	Radiator drain plug (4) four cylinder turbocharged aftercooled	6	N·m
Torque	Secondary fuel filter vent screw	24	N·m
Torque	Solenoid nut torque (FT3198 Solenoid Tool, 352-2733 solenoid)	3.75	Nm	+/- .75
Torque	Tightening torque for 369-5916 Lifting Eyebolt (M12 Hex Bit)	115	N·m
Torque	Working torque capacity of locknut spanner wrenches (126-6608 / 126-6609)	950	N·m
Valve clearance	Exhaust valve lash	0.20	mm	cold
Valve clearance	Inlet valve lash	0.20	mm	cold

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		Caterpillar EC-1 (Cat ELC) - Preferred			1:1 mixture of water and glycol; Cat ELC service life 12000 hours or six years
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 DEO-ULS			8.9 L	C2.2 Turbocharged and Turbocharged Aftercooled crankcase oil sump refill capacity
Engine oil	Cat DEO-ULS SAE 10W-30	EMA; API; SAE		4.5 L	C1.7 crankcase oil sump refill capacity
Engine oil	Cat DEO-ULS SAE 15W-40	EMA; API; SAE			Passes proprietary tests (piston ring sticking, oil control, wear, soot)
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 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	Ultra low sulfur diesel (ULSD)	EPA prescribed fuel			Refer to SEBU6251 for distillate fuel specification
Grease		Caterpillar greases (moderate to high performance)			Purge joint when switching grease or supplier
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.

Fault codes

Code	Name	Meaning	Severity	Action
5838-14	EGR Valve Malfunction : Special Instruction	Active at 3100 hours if cleaning and reset not performed; amber warning lamp flashes and the engine is derated	Warning	Perform the EGR valve cleaning and reset the EGR maintenance timer.
5838-31	EGR Valve Malfunction	Active at 3000 hours; amber warning lamp becomes solid; informs operator that cleaning and reset are required	Warning	Clean the EGR valve, connecting pipe and exhaust cooler and reset the EGR maintenance timer within 100 hours.

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

Procedures

Engine Valve Lash - Check adjustment

⚠ Ensure the engine cannot be started while this maintenance is performed.

⚠ Hot engine components can cause burns.

Ensure the engine cannot be started and is stopped.
Measure the inlet valve lash; specification 0.20 mm.
Measure the exhaust valve lash; specification 0.20 mm.
Adjust valves per Systems Operation, Testing and Adjusting sequence.

Alternator and Fan Belts - Replace (Single-V Belt) maintenance

If the engine is equipped with fan guards, remove the fan guards.
Loosen bolt (1) and bolt (2) on the adjuster link.
Loosen nut (4) and bolt (5).
Push the alternator toward the engine and remove the belt.
Position the new belt onto the alternator, water pump and crankshaft pulleys.
Slide the alternator away from the engine to tighten the belt.
Tighten bolt (1) and bolt (2) to a torque of 25 N·m.
Tighten nut (4) and bolt (5) to a torque of 25 N·m.
Install the fan guards.
Check the belt tension again after 20 hours of engine operation.

Battery - Replace maintenance

⚠ Batteries give off combustible gases which can explode.

Switch the engine to the OFF position and remove all electrical loads.
Turn off and disconnect any battery chargers.
Disconnect the NEGATIVE '-' cable from the battery terminal.
Disconnect the POSITIVE '+' cable from the battery terminal.
Remove the used battery and recycle it.
Install the new battery.
Connect the cable from the starting motor to the POSITIVE '+' terminal.
Connect the NEGATIVE '-' cable to the NEGATIVE '-' terminal.

Cooling System Coolant (ELC) - Change maintenance

⚠ Pressurized System: Hot coolant can cause serious burns.

Stop the engine and allow it to cool; loosen the filler cap slowly to relieve pressure.
Remove the engine drain plug and the radiator drain plug; drain the coolant.
Flush the cooling system with clean water to remove debris.
Close the drain valve and install the drain plugs.
Fill the cooling system with clean water and install the filler cap.
Run the engine at low idle until temperature reaches 49 °C to 66 °C.
Stop the engine and allow it to cool; drain and flush with clean water.
Fill the cooling system with Extended Life Coolant (ELC).
Run the engine at high idle for 1 minute to purge air; stop the engine.
Maintain coolant at the maximum mark and install the filler cap.

Engine Crankcase Breather Element - Replace maintenance

⚠ Hot oil and hot components can cause personal injury.

Ensure dirt cannot enter the breather assembly and place a container under it.
Remove clip (3) and hose (4) from cap (2); remove cap (2) from body (1).
Remove filter element (5) and O ring seal (6); discard.
Install a new O ring seal (6) and a new filter element (5) into cap (2).
Install the cap assembly into the main body and tighten to 10 N·m.
Install hose (4) and clip (3); clean away any split fluid.

Engine Oil and Filter - Change maintenance

⚠ Hot oil and hot components can cause personal injury.

⚠ Do not fill the oil filters with oil before installing them.

Tools: 1U-8760 Chain Wrench, 175-7546 Oil Filter Cutter Gp

Drain the crankcase with the engine stopped and the oil warm.
Remove the oil filter with a 1U-8760 Chain Wrench.
Cut the oil filter open with a 175-7546 Oil Filter Cutter Gp to inspect debris.
Clean the sealing surface of the cylinder block.
Apply clean engine oil to the new oil filter seal.
Install the oil filter and tighten by hand per the filter instructions.
Fill the crankcase with the correct amount of oil.
Crank the engine with the fuel OFF to fill the oil filters.
Start the engine and run at LOW IDLE for 2 minutes.
Stop the engine and allow oil to drain back for a minimum of 10 minutes.
Check the oil level between the ADD and FULL marks.

Fuel System - Prime maintenance

⚠ Do not loosen the high-pressure fuel lines to purge air.

Ensure the fuel tank is full and any fuel valve is in the ON position.
For gravity feed systems, loosen the vent screw and allow fuel to flow.
When air-free fuel comes from the vent screw, tighten it by hand.
Loosen the vent screw on the secondary fuel filter.
Turn the keyswitch to RUN to operate the electric priming pump.
When air-free fuel comes from the vent screw, tighten it to 24 N·m.
Operate the electric priming pump for 2 minutes.
Turn the keyswitch to the OFF position.
Crank the engine and run at low idle for a minimum of 5 minutes.
Ensure the fuel system is free from leaks.

Installation of two-piece seal into slack adjuster piston (209-6381 Seal Installer Group) maintenance

Tools: 207-3440 Loading Mandrel, 207-3442 Ring Pusher, 207-3444 Seal Sizer, 8F-8178 Bolt

Place 207-3440 Loading Mandrel over small piston.
Place inner portion of two-piece seal onto mandrel and push onto piston using 207-3442 Ring Pusher. Repeat for outer portion of seal.
With both sets of seals installed, push piston assembly into 207-3444 Seal Sizer.
Allow seals to compress for one minute and then install small piston into large piston.

Sprocket wheel removal - 8T-5243 Adapter Group installation maintenance

Tools: 8T-5243 Adapter Group, 7B-2499 Ring, 6H-4158 Pin, 5F-9306 Arm, 8S-9975 Ram Adapter, 9S-8900 Cylinder Group

Install adapter groups evenly spaced in the holes in the sprocket flange; install the hooked adapter (1) first, then the plate (2).
Fasten plate to adapter with two bolts (3) and washers (4); plate retains adapter in sprocket wheel.
Before installing remainder of tooling, loosen bolt (5) to leave about 6.35 mm (0.25 in) gap between retainer (6) and sprocket wheel.
Install the hydraulic cylinder and the remainder of the tooling in the conventional manner.

Starting the Engine operation

⚠ Do not use aerosol types of starting aids such as ether.

⚠ Do not start the engine under load.

Disengage any equipment that is driven by the engine.
Turn the keyswitch to RUN and wait until the glow plug lamp extinguishes.
Turn the keyswitch to START; the starter motor cranks the engine.
If the engine fails to start within 30 seconds, wait two minutes before retrying.
Allow the keyswitch to return to RUN after the engine starts.
Allow constant speed engines to reach operating speed with no load; run 2 minutes before load.

Stopping the Engine operation

⚠ Stopping the engine immediately after it has been working under load can result in overheating and accelerated wear.

Remove the load from the engine and reduce the engine speed to low idle.
Allow the engine to idle for 5 minutes to cool the engine.
Turn the ignition keyswitch to the OFF position.

STOR Plug Assembly application for disc brake piston retainer spring (174-5354) repair

Tools: 174-5354 STOR Plug Assembly, 134-2562 Guides, 9S-9334 Plugs, 6N-9155 Pin

Insert four 134-2562 Guides and discontinued 130-8718 Springs as an assembly into brake group anchor exterior holes where 9S-9334 Plugs are normally located.
Insert four 174-5354 Plug Assemblies into exterior holes and finger tighten.
Screw in attached bolts until guide noses protrude through brake piston.
Insert discontinued 6N-9155 Pin into each guide hole and remove bolts and plugs.
Insert four 9S-9334 Plugs into vacated holes.

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 Caterpillar C2.2 family

Part #	Description	Category
g06164568	(1) Air charge cooler (Engines with Factory Installed Radiators)	air_charge_cooler
198-5314	Air Primary	air_filter
244-0514	Air filter	air_filter
246-5011	Air Filter	air_filter
247-1378	Air filter	air_filter
247-1380	Air Filter	air_filter
263-1285	Air filter	air_filter
266-2793	Air Filter	air_filter
AEHQ5900-01	Air Cleaner, Dual Element, Radial Seal	air_filter
g06164558	(1) Coolant filler cap (Engines with Factory Installed Radiators)	coolant_filler_cap
g06103572	(1) Electric fuel priming pump (Off Engine Components for Three and Four Cylinder Engines)	electric_fuel_pump
g06103579	(1) Electronic unit injector (Model View Illustrations)	electronic_unit_injector
033-7854	Filter fuel	fuel_filter
150-4142	Filter fuel	fuel_filter
155-8080	Filter fuel	fuel_filter
276-1804	Fuel	fuel_filter
276-1806	Fuel Filter	fuel_filter
308-7298	Filter water separator	fuel_filter
035-8059	Glow plug	glow_plug
g03881462	Ground to battery (Electrical System)	grounding
g03881463	Alternate ground to battery (Electrical System)	grounding
g03886691	(1) High-pressure line (4 Cylinder engine)	high_pressure_line
252-1466	Fuel injector	injector
g06068852	(Typical example) Model View Illustrations (Product Information)	model_view_illustration
i06713414	Model View Illustrations (Product Information)	model_view_illustration
220-1523	Engine Oil	oil_filter
1540867	Connecting rod	other_service
1566980	Connecting rod	other_service
877201-4	Ignition kit	other_service
M0064264-06	Fuel Injection Lines - Install	other_service
g06508459	Engine Electronics	other_service
i03635086	Engine Starting	other_service
i03648639	Engine Stopping	other_service
i08258438	Before Starting Engine	other_service
183-4320	Lift/transfer pump	pump
KM-BD-909035	Hydraulic Track Adjuster Seal Kit	seal
249-5541	Thermostat	thermostat
251-7660	Thermostat	thermostat

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

Aftermarket parts that fit this engine

394-3492 FridayParts $138.00 424-6821 FridayParts $167.72 578-9822 FridayParts $1095.50 5P-8309 FridayParts $48.90 148-8385 FridayParts $10.80 242-0172 FridayParts $36.75 246-5011 Amazon eBay $25.00 FridayParts $24.99 551-6183 FridayParts $39.99 303-6658 KuduParts $46.00 154-4504 FridayParts $1585.56 302-4181 FridayParts $25.54 218-6833 FridayParts $299.25 218-6250 FridayParts $102.59 VA07-AP8/C-58S FridayParts $102.59 568-8661 FridayParts $135.00 293-4781 KuduParts $48.00 203-4827 FridayParts $168.56 171-5883 FridayParts $40.99 175-7513 FridayParts $68.41 171-5882 FridayParts $68.41 388-3782 FridayParts $56.99 249-5541 eBay $20.00 FridayParts $19.99 345-6230 KuduParts $308.00 236-6057 Amazon eBay $159.49 FridayParts $102.80 144-9962 FridayParts $108.02 457-5836 FridayParts $379.00 311-7561 KuduParts $73.00 164-8900 FridayParts $105.99 253-8003 FridayParts $105.99 253-8001 FridayParts $105.99 234-0732 FridayParts $17.99 207-9735 FridayParts $17.99 035-8059 eBay $23.22 FridayParts $13.25 149-0686 FridayParts $100.88 227-8807 FridayParts $100.88 199-7447 FridayParts $100.88 293-6264 FridayParts $489.99 177-1958 FridayParts $58.29 262-0941 FridayParts $57.29 230-3727 FridayParts $1143.99 142-8720 KuduParts $1874.00 361-4663 FridayParts $1894.62 302-7821 SinoCMP $639.00 295-8181 FridayParts $659.99 295-8183 FridayParts $659.99 229-8757 FridayParts $48.50 132-5166 KuduParts $36.00 215-2605 KuduParts $16.00 380-1882 FridayParts $42.73 124-2150 FridayParts $31.50 437-2877 FridayParts $62.89 263-4997 FridayParts $145.00 036-1865 FridayParts $35.11 216-6161 FridayParts $205.99 456-1778 FridayParts $619.99 357-3053 FridayParts $56.99 3392900 FridayParts $175.30 8.4KW FridayParts $835.80 424-6652 FridayParts $835.80 520-6648 FridayParts $835.80

Parts listed by aftermarket suppliers as fitting this engine — leads compiled from supplier catalogs; verify the exact part for your serial number.

Also used in

Caterpillar 216B2 — Skid Steer Loader
Caterpillar 216B3 — Skid Steer Loader
Caterpillar 226B — Skid Steer Loader
Caterpillar 226B3 — Skid Steer Loader
Caterpillar 226D3 — Skid Steer Loader
Caterpillar 232D3 — Skid Steer Loader
Caterpillar 239D3 — Skid Steer Loader
Caterpillar 249D3 — Skid Steer Loader
Caterpillar AP255E — Paver
Caterpillar CC34 — Compactor

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 C2.2?

The Caterpillar C2.2 engine has an oil capacity of 8.9 liters.

What is the displacement of the Caterpillar C2.2?

The Caterpillar C2.2 has a displacement of 2.2 liters with 4 cylinders.

Which generators use the Caterpillar C2.2 engine?

The Caterpillar C2.2 powers 9 generator set(s), including Caterpillar C2.2, Caterpillar D18-4, Caterpillar D20, Caterpillar D20-6, Caterpillar D25-8.