The Caterpillar CAT C18 ATAAC is a 18.13 L 6-cylinder air-to-air aftercooled engine rated at 1500 rpm. It powers generator sets from Caterpillar, including the DM9819 and DM9828. It holds 38 L (10.0 gal) of oil and 20.8 L (5.5 gal) of coolant.
Also known as: Caterpillar CAT C18 ATAAC
Part of the Caterpillar CAT engine family — 3 variants share parts & fitment.
| Oil capacity | 38.0 L |
|---|---|
| Coolant capacity | 20.8 L |
| Displacement | 18.13 L |
| Cylinders | 6 |
| Aspiration | Air-to-Air Aftercooled |
| Rated speed | 1500 rpm |
| Fluid | Grade | Standard | Ambient | Capacity | Notes |
|---|---|---|---|---|---|
| Coolant | SCAC cooling / jacket water | Generator temperature rise based on a 40 degree C ambient per NEMA MG1-32. | |||
| Engine oil | Lubricating oil | 675.0 L | Sump refill with filter; integral lube oil cooler, gear type lube oil pump | ||
| Fuel | 35 API gravity | LHV of 42 780 kJ/kg (18,390 Btu/lb) at 29 C (85 F), weighing 838.9 g/liter (7.001 lbs/U.S. gal.) | |||
| Fuel | No. 2 diesel fuel, 35º API gravity | LHV 42 780 kJ/kg (18,390 Btu/lb) | Weighing 838.9 g/liter (7.001 lbs/U.S. gal.), used at 29º C (85º F). Consult Cat dealer for Low Sulfur fuel and Biodiesel capability. |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
The Caterpillar CAT C18 ATAAC engine has an oil capacity of 38.0 liters.
The Caterpillar CAT C18 ATAAC has a displacement of 18.13 liters with 6 cylinders.
The Caterpillar CAT C18 ATAAC powers 2 generator set(s), including Caterpillar DM9819, Caterpillar DM9828.