The Caterpillar C6.6 is a 6.6 L 6-cylinder na engine rated at 2300 rpm, producing up to 128 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: Caterpillar 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 | NA |
| Rated speed | 2300 rpm |
| Gross power | 128 kW |
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | — | ||||
| Fuel filter | — | ||||
| Oil filter | — | ||||
| Battery | Dual 12V (950 CCA) Cat brand maintenance free batteries | — | |||
| Belt | Blower fan, fan drive, and belts complete with protection guards | — | |||
| Coolant filter | 50% coolant antifreeze with corrosion inhibitor | — | |||
| Oil | — | ||||
| Spark plug | Glow plugs fitted on the engine | — |
Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.
| Item | Action | Hours | Months | Notes |
|---|---|---|---|---|
| oil | Change | 500 hr | 3000 Series service intervals increased to 500 hours as standard (3013C, 3024C, 3054, 3056) | |
| minor overhaul | Other | 20000 hr | 3600 engines designed to run 20 000 hours between minor overhauls using No. 2 fuel | |
| major overhaul | Other | 40000 hr | 3600 engines designed to run 40 000 hours between major overhauls using No. 2 fuel | |
| cylinder liners and pistons | Other | 80000 hr | 3600 cylinder liners and pistons designed for 80 000 hours using No. 2 fuel |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
| Type | Item | Value | Unit | Condition |
|---|---|---|---|---|
| Pressure | Unit injector fuel injection pressure | 1240 | bar (18 000 psi) |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
| Fluid | Grade | Standard | Ambient | Capacity | Notes |
|---|---|---|---|---|---|
| Fuel | No. 2 fuel | 3600 engines designed for 80 000 hours on No. 2 fuel; ratings based on API gravity of 35 at 15 C (60 F), LHV of 42 780 kJ/kg used at 29 C (84 F) with a density of 838.9 g/L |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
| 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 |
| i02234878 | Electrical System | electrical_system |
| g01162916 | Engine Electronics - Grounding Practices | grounding_practices |
| 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 16 | other_service |
| i01489970 | Generator Isolating for Maintenance | other_service |
| i02328530 | Engine Stopping | other_service |
| i03991620 | Important Safety Information | other_service |
| JPR-HDS170 | PUMP ASSY | pump |
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 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.