The Caterpillar C18 ATAAC is a 18.13 L 6-cylinder air-to-air aftercooled engine rated at 1800 rpm, producing up to 400 kW. It powers generator sets from Caterpillar, including the C18, DM8518, DM8522 and DM9628. It holds 64 L (16.9 gal) of oil and 20.8 L (5.5 gal) of coolant.
Also known as: CAT C18 ATAAC
Part of the Caterpillar C18 engine family — 2 variants share parts & fitment.
| Oil capacity | 64.0 L |
|---|---|
| Coolant capacity | 20.8 L |
| Displacement | 18.13 L |
| Cylinders | 6 |
| Aspiration | Air-to-air aftercooled |
| Rated speed | 1800 rpm |
| Gross power | 400 kW |
| 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.
Cross-referenced via Donaldson + OEM/engine-maker interchange — options to verify against your serial number, not confirmed for every exact variant.
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 ATAAC engine has an oil capacity of 64.0 liters.
The Caterpillar C18 ATAAC has a displacement of 18.13 liters with 6 cylinders.
The Caterpillar C18 ATAAC powers 6 generator set(s), including Caterpillar C18, Caterpillar DM8518, Caterpillar DM8522, Caterpillar DM9628, Caterpillar DM9824.
The Caterpillar C18 ATAAC uses oil filter part numbers Caterpillar 2P4005, Donaldson P554005, Wix 51792.
The Caterpillar C18 ATAAC uses fuel filter part numbers Donaldson P551319, Wix 33674.
The Caterpillar C18 ATAAC uses air filter part numbers Caterpillar 2453818, Caterpillar 2901936, Caterpillar 2453819.