The Caterpillar C6.6 is a 6.6 L 6-cylinder turbocharged, air-to-air aftercooled engine rated at 1800 rpm, producing up to 250 kW. It powers generator sets from Caterpillar, including the C6.6 Generator Set, D125, D150 and D175. It holds 16.5 L (4.4 gal) of oil and 21 L (5.5 gal) of coolant.
Also known as: Cat C6.6
Part of the Caterpillar C6.6 engine family — 2 variants share parts & fitment.
| Oil capacity | 16.5 L |
|---|---|
| Coolant capacity | 21.0 L |
| Displacement | 6.6 L |
| Cylinders | 6 |
| Aspiration | Turbocharged, Air-to-Air Aftercooled |
| Rated speed | 1800 rpm |
| Gross power | 250 kW |
| Part # | Description | Category |
|---|---|---|
| S200-0369 | Maintenance-free battery, 1000 CCA (2) | battery |
| S200-0632 | Starting and charging system, 24V | battery |
| S200-1156 | Keyless battery disconnect switch | battery |
| S200-0863 | Keyless ignition stop/start switch | ignition |
| S200-1038 | Starting aid, thermal | ignition |
| S200-0578 | Directional signals, front & rear | light |
| S200-0758 | Halogen work lights, front & rear | light |
| S200-0957 | Roading lights | light |
| 289-2630 | 5×5 fl ood, work lamps | lighting |
| INT9-101F | Replaces any core plug | other_service |
| INT9-102F | Replaces any core plug | other_service |
| TPL-489-C | OPERATING & MAINTENANCE OF D175 | other_service |
| g01162918 | Illustration 38 - Typical example (4) Ground to engine, (5) Ground to battery | other_service |
| i01489970 | Generator Isolating for Maintenance | other_service |
| i02234878 | Engine Stopping | other_service |
| i02328530 | Engine Stopping | other_service |
| i03991620 | Important Safety Information | other_service |
| JPR-HDS170 | PUMP ASSY | pump |
| g01162916 | Illustration 37 - Typical example (1) Starting motor to engine block, (2) Ground to starting motor, (3) Ground to battery | starter |
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.
The Caterpillar C6.6 engine has an oil capacity of 16.5 liters.
The Caterpillar C6.6 has a displacement of 6.6 liters with 6 cylinders.
The Caterpillar C6.6 powers 5 generator set(s), including Caterpillar C6.6 Generator Set, Caterpillar D125, Caterpillar D150, Caterpillar D175, Caterpillar XQ175.