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.
| Oil capacity | 20.8 L |
|---|---|
| Coolant capacity | 20.8 L |
| Displacement | 18.13 L |
| Cylinders | 6 |
| Aspiration | Air-to-Air Aftercooled |
| Rated speed | 1800 rpm |
| Gross power | 515 kW |
This engine also powers 142 machine(s) on Power Equipment Info.
| Part # | Description | Category |
|---|---|---|
| 888-983-7847 | ENGINE BLOCK CRANKSHAFT | other_service |
| A100 | Download Specification | other_service |
| g00284658 | Illustration 17 EPA Emissions Certification Film | other_service |
| g00415538 | Illustration 18 European Emissions Certification Film | other_service |
| g00702020 | Wear a hard hat, protective glasses, and other protective equipment, as required. | other_service |
| g00704000 | Illustration 8 | other_service |
| g00704059 | Illustration 9 | other_service |
| g00771448 | Grounding Practices | other_service |
| g01054560 | Illustration 23 Typical performance monitor panel | other_service |
| g01054562 | Illustration 24 Typical performance monitor panel for totals | other_service |
| g01054565 | Illustration 25 Typical performance monitor panel for settings | other_service |
| g01054566 | Illustration 26 Typical performance monitor panel for service | other_service |
| g01065152 | Illustration 16 (1) Serial number plate (2) Information plate | other_service |
| g01233007 | Illustration 20 | other_service |
| g01416712 | Illustration 1 | other_service |
| g01459611 | Illustration 21 | other_service |
| g01459691 | Illustration 22 Caterpillar Messenger Display | other_service |
| i00844066 | Emissions Certification Film | other_service |
| i00863835 | Self-Diagnostics | other_service |
| i00911989 | Before Starting Engine | other_service |
| i01103904 | Engine Starting | other_service |
| i01359666 | Crushing Prevention and Cutting Prevention | other_service |
| i01372247 | Mounting and Dismounting | other_service |
| i01372254 | Fire Prevention and Explosion Prevention | other_service |
| i01463253 | Diagnostic Lamp | other_service |
| i01646248 | SMCS Code: 1000 | other_service |
| i01658146 | Important Safety Information | other_service |
| i01934760 | SMCS Code: 1000; 1401; 1402; 1900 | other_service |
| i01988813 | Product Lifting | other_service |
| i02068367 | Product Storage | other_service |
| i02088692 | Plate Locations and Film Locations | other_service |
| i02109067 | Operation and Maintenance Manual, 'Maintenance Interval Schedule' | other_service |
| i02164876 | Reference Numbers | other_service |
| i02469632 | Electrical System | other_service |
| i02496338 | Diagnostic Flash Code Retrieval | other_service |
| i02566298 | General Hazard Information | other_service |
| i02784356 | Engine Electronics | other_service |
| i02840188 | Safety Messages | other_service |
| i02944987 | Monitoring System | other_service |
Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.
Parts listed by aftermarket suppliers as fitting this engine — leads compiled from supplier catalogs; verify the exact part for your serial number.
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.
The Caterpillar C18 engine has an oil capacity of 20.8 liters.
The Caterpillar C18 has a displacement of 18.13 liters with 6 cylinders.
The Caterpillar C18 powers 3 generator set(s), including Caterpillar C18, Caterpillar C18-20' XQ600, Caterpillar XQ1140.