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Home›Engines›Caterpillar C18

Caterpillar C18 Engine Engine

The Caterpillar C18 is a 18.13 L 6-cylinder air-to-air aftercooled engine rated at 1800 rpm, producing up to 515 kW. It powers generator sets from Caterpillar, including the C18-20' XQ600 and XQ1140. It holds 20.8 L (5.5 gal) of oil and 20.8 L (5.5 gal) of coolant.

Also known as: Caterpillar C18, C18

Part of the Caterpillar C18 engine family — 2 variants share parts & fitment.

18.13 L
Displacement
6
Cylinders
1800 rpm
Rated speed
515 kW
Gross power

Engine specifications

Oil capacity20.8 L
Coolant capacity20.8 L
Displacement18.13 L
Cylinders6
AspirationAir-to-Air Aftercooled
Rated speed1800 rpm
Gross power515 kW

Generator sets powered by this engine

3
Caterpillar C18Caterpillar C18-20' XQ600Caterpillar XQ1140

Parts cataloged across the Caterpillar C18 family

39
Part #DescriptionCategory
888-983-7847ENGINE BLOCK CRANKSHAFTother_service
A100Download Specificationother_service
g00284658Illustration 17 EPA Emissions Certification Filmother_service
g00415538Illustration 18 European Emissions Certification Filmother_service
g00702020Illustration 4other_service
g00704000Illustration 8other_service
g00704059Illustration 9other_service
g00771448Grounding Practicesother_service
g01054560Illustration 23 Typical performance monitor panelother_service
g01054562Illustration 24 Typical performance monitor panel for totalsother_service
g01054565Illustration 25 Typical performance monitor panel for settingsother_service
g01054566Illustration 26 Typical performance monitor panel for serviceother_service
g01065152Illustration 16 (1) Serial number plate (2) Information plateother_service
g01233007Illustration 20other_service
g01416712Illustration 1other_service
g01459611Illustration 21other_service
g01459691Illustration 22 Caterpillar Messenger Displayother_service
i00844066Emissions Certification Filmother_service
i00863835Self-Diagnosticsother_service
i00911989Before Starting Engineother_service
i01103904Engine Startingother_service
i01359666Crushing Prevention and Cutting Preventionother_service
i01372247Mounting and Dismountingother_service
i01372254Fire Prevention and Explosion Preventionother_service
i01463253Diagnostic Lampother_service
i01646248SMCS Code: 1000other_service
i01658146Important Safety Informationother_service
i01934760SMCS Code: 1000; 1401; 1402; 1900other_service
i01988813Product Liftingother_service
i02068367Product Storageother_service
i02088692Plate Locations and Film Locationsother_service
i02109067SMCS Code: 1000; 1400; 1450other_service
i02164876Reference Numbersother_service
i02469632Electrical Systemother_service
i02496338Diagnostic Flash Code Retrievalother_service
i02566298General Hazard Informationother_service
i02784356Engine Electronicsother_service
i02840188Safety Messagesother_service
i02944987Monitoring Systemother_service

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

60
3E-0156 PartsGeek sinocmp $29.00 3126B PartsGeek kuduparts $18.00 966D PartsGeek yemparts $52.61 966E PartsGeek yemparts $52.61 950E PartsGeek yemparts $52.61 950B PartsGeek yemparts $52.61 366-9313 PartsGeek FridayParts $39.99 311D PartsGeek yemparts $54.51 312D PartsGeek sinocmp $30.00 314D PartsGeek yemparts $54.51 320D PartsGeek sinocmp $35.00 330D PartsGeek sinocmp $15.00 336D PartsGeek yemparts $34.13 345C PartsGeek yemparts $41.31 345D PartsGeek yemparts $41.31 349D PartsGeek yemparts $37.81 385C PartsGeek yemparts $41.70 390D PartsGeek yemparts $37.81 1W4845 PartsGeek atldiesel $30.39 1W8845 PartsGeek 245B PartsGeek yemparts $74.42 245D PartsGeek yemparts $54.39 10R-6317 PartsGeek 440-1616 PartsGeek 133-0125 PartsGeek FridayParts $488.15 2W-1008 PartsGeek FridayParts $488.15 7C-3039 PartsGeek FridayParts $488.15 771C PartsGeek yemparts $150.37 771D PartsGeek yemparts $62.40 814B PartsGeek yemparts $111.78 824G PartsGeek yemparts $111.78 834B PartsGeek yemparts $90.89 980C PartsGeek yemparts $40.88 988B PartsGeek yemparts $40.88 623E PartsGeek yemparts $252.54 627E PartsGeek yemparts $44.96 4309449 PartsGeek atldiesel $75.80 793F PartsGeek yemparts $98.05 795F PartsGeek yemparts $159.22 797F PartsGeek yemparts $98.05 291-5911 PartsGeek sinocmp $479.00 10R-7230 PartsGeek sinocmp $479.00 631K PartsGeek advancedtruck $1322.00 637K PartsGeek advancedtruck $234.00 657G PartsGeek yemparts $44.95 772G PartsGeek yemparts $85.86 834K PartsGeek 988K PartsGeek yemparts $50.42 527-5395 PartsGeek yemparts $226.19 374DL PartsGeek yemparts $226.19 365C PartsGeek yemparts $34.13 365CL PartsGeek yemparts $226.19 385CL PartsGeek yemparts $226.19 189-4918 PartsGeek yemparts $5471.40 631E PartsGeek yemparts $44.96 631G PartsGeek yemparts $119.40 633E PartsGeek yemparts $44.96 637E PartsGeek yemparts $44.95 637G PartsGeek yemparts $80.13 657E PartsGeek yemparts $40.88

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

Common questions

What is the oil capacity of the Caterpillar C18?

The Caterpillar C18 engine has an oil capacity of 20.8 liters.

What is the displacement of the Caterpillar C18?

The Caterpillar C18 has a displacement of 18.13 liters with 6 cylinders.

Which generators use the Caterpillar C18 engine?

The Caterpillar C18 powers 3 generator set(s), including Caterpillar C18, Caterpillar C18-20' XQ600, Caterpillar XQ1140.