The Caterpillar CAT C9 ATAAC is a 8.8 L 6-cylinder turbocharged air-to-air aftercooled engine rated at 1800 rpm. It powers generator sets from Caterpillar. It holds 39 L (10.3 gal) of oil and 22 L (5.8 gal) of coolant.
Also known as: Caterpillar CAT C9 ATAAC
Part of the Caterpillar C9 engine family — 6 variants share parts & fitment.
| Oil capacity | 39.0 L |
|---|---|
| Coolant capacity | 22.0 L |
| Displacement | 8.8 L |
| Cylinders | 6 |
| Aspiration | Turbocharged Air-to-Air Aftercooled |
| Rated speed | 1800 rpm |
| Part # | Description | Category |
|---|---|---|
| AP70121 | Diesel particulate filter (DPF) | Dpf |
| AP70123 | Diesel particulate filter (DPF) | Dpf |
| 142-1340 | Air Primary | Air filter |
| 142-1403 | Air Secondary | Air filter |
| 142-1404 | Air filter inner | Air filter |
| 211-2660 | Air filter assy | Air filter |
| 220-0454 | Air Primary | Air filter |
| 262-5194 | Air | Air filter |
| 6I2502 | Air filter inner | Air filter |
| P03-511-000 | Air Filter | Air filter |
| P03-521-000 | Air Filter | Air filter |
| P03-532-000 | Air Filter | Air filter |
| P04-511-000 | Battery | Battery |
| P04-521-000 | Battery | Battery |
| P04-532-000 | Battery | Battery |
| 118-2018 | V-belt | Belt |
| 130-3216 | V-belt | Belt |
| 183-4494 | V-belt | Belt |
| 190-4155 | V-belt | Belt |
| 211-5022 | V-belt | Belt |
| 241-2896 | V-belt | Belt |
| 263-1830 | V-belt | Belt |
| 7M4705 | V-belt | Belt |
| M-1904155 | Fan, 8 Rib, 88.42in (2246mm) | Belt |
| P01-521-000 | Boom and Stick | Boom and stick |
| 111-2369 | Maintenance Element | Coolant filter |
| i0287178 | Cooling System Coolant Sample (Level 1) - Obtain | Cooling system cooldown sample level 1 obtain |
| i0287180 | Cooling System Coolant Sample (Level 2) - Obtain | Cooling system cooldown sample level 2 obtain |
| i0287189 | Diesel Particulate Filter - Clean | Diesel particulate filter clean |
| i0287195 | Engine Air Cleaner Element - Clean/Replace | Engine air cleaner element clean replace |
| i0287193 | Engine Air Cleaner Element (Dual Element) - Clean/Replace | Engine air cleaner element dual element clean replace |
| i0287192 | Engine - Clean | Engine clean |
| i0287200 | Engine Oil Level Gauge - Calibrate | Engine oil level gauge calibrate |
| i0287212 | Engine Storage Procedure - Check | Engine storage procedure check |
| 101-2844 | 1 gallon (3.8L) | Fluid |
| 119-5152 | Cat Engine Oil (quart bottle) | Fluid |
| 35300516 | IR XHP1001 55 Gal. (208 litres) | Fluid |
| 35382928 | IR Performance 500 compressor fluid, 1 Gal. | Fluid |
| 35382936 | IR Performance 500 compressor fluid, 5 Gal. | Fluid |
| 35382944 | IR Performance 500 compressor fluid, 55 Gal. | Fluid |
| 35612738 | IR XHP1001 compressor fluid, 5 gal. (19.0 Litre) | Fluid |
| 36866903 | Engine Oil (55 gal) | Fluid |
| 36875938 | Engine Oil (5 gal) | Fluid |
| 36899698 | IR Pro-Tec 1 gal. (3.8 litre) | Fluid |
| 36899706 | IR Pro-Tec 5 Gal. (19.0 litres) | Fluid |
| 36899714 | IR Pro-Tec 55 Gal. (208 litres) | Fluid |
| 36899722 | IR Pro-Tec 220 Gal. (836 litres) | Fluid |
| 54418827 | IR XHP 505 compressor fluid, 275 Gal. Tote | Fluid |
| 54418835 | IR XHP 505 compressor fluid, 5 Gal. | Fluid |
| 54418843 | IR XHP 505 compressor fluid, 55 Gal. | Fluid |
| 54480918 | Engine Oil, 1 gal. (3.8 Litre) | Fluid |
| 89292981 | Pro-Tec compressor fluid, Europe 208 Litre | Fluid |
| 89311716 | Engine Oil, Europe 20 Litre | Fluid |
| 89311724 | Engine Oil, Europe 208 Litre | Fluid |
| 1R-0762 | Fuel Secondary - ADV | Fuel filter |
| 1R-0770 | Fuel/Water Separator | Fuel filter |
| 1R0749 | Filter fuel | Fuel filter |
| 1R0751 | Fuel Filter (secondary) | Fuel filter |
| 1R0762 | Filter fuel | Fuel filter |
| 326-1643 | Filter water separator | Fuel filter |
| 326-1644 | Filter water separator | Fuel filter |
| 3S3875 | Filter fuel | Fuel filter |
| M-1393526 | 1 1 Fuel Filter Base Gasket | Fuel filter |
| P02-511-000 | Fuel Filter | Fuel filter |
| P02-521-000 | Fuel Filter | Fuel filter |
| P02-532-000 | Fuel Filter | Fuel filter |
| i0287215 | Fuel System - Prime | Fuel system prime |
| i0287225 | Fuel Tank Water and Sediment - Drain | Fuel tank water and sediment drain |
| 1613411 | Exhaust Manifold Gasket | Gasket |
| 1661781 | Front Cover Gasket | Gasket |
| 187-1315 | Gasket cylinder head | Gasket |
| 190-6114 | Gasket oil pan | Gasket |
| 1906114 | Oil Pan Gasket | Gasket |
| 1914457 | Regulator Housing Gasket | Gasket |
| 192-2133 | Gasket exhaust manifold | Gasket |
| 1950452 | Oil Pick Up Tube Gasket | Gasket |
| 1P0451 | Turbo Mounting Gasket | Gasket |
| 1P436 | Fuel Priming Pump Gasket | Gasket |
| 2002258 | Water Pump Gasket | Gasket |
| 2090762 | Front Cover Gasket | Gasket |
| 2097290 | Oil Filter Base Gasket | Gasket |
| 2097293 | Oil Cooler Core Gasket | Gasket |
| 217-5701 | Gasket valve cover | Gasket |
| 2175701 | Valve Cover Gasket | Gasket |
| 2192340 | Regulator Housing Gasket | Gasket |
| 2683490 | Valve Cover Gasket Base | Gasket |
| 2854106 | Valve Cover Gasket Upper | Gasket |
| 2S0795 | Core Gasket | Gasket |
| 7C7431 | Turbo Mounting Gasket | Gasket |
| 7M7273 | Turbo Mounting Gasket | Gasket |
| AP70122 | DPF gasket | Gasket |
| AP70314 | DPF gasket | Gasket |
| M-1050452 | Oil Pickup Tube Gasket 35, 38 | Gasket |
| M-1136250 | 1 Manifold to Cylinder Head Oil Cooler Gasket | Gasket |
| M-1154245 | 1 Manifold to Cylinder Head Intake Manifold Gasket | Gasket |
| M-1192950 | 1 Valve Cover Gasket | Gasket |
| M-1193072 | 1 Oil Pan Gasket | Gasket |
| M-1265466 | 1 Regulator Gasket | Gasket |
| M-1279811 | 1 Friont Cover Gasket | Gasket |
| M-1359819 | 1 Cam Follower Cover Gasket | Gasket |
| M-1360812 | 1 Regulator Gasket | Gasket |
| M-13932526 | Front Cover Gasket 19, 29 | Gasket |
| M-1443472 | 1 Oil Cooler Gasket | Gasket |
| M-1613411 | 6 Dry Manifold Front Cover Gasket | Gasket |
| M-1661781 | 1 Front Cover Gasket | Gasket |
| M-1697487 | 1 Oil Pan Gasket | Gasket |
| M-1914457 | 1 Regulator Housing Gasket to Cylinder Head | Gasket |
| M-1950452 | 1 Oil Pick Up Tube Gasket | Gasket |
| M-1957339 | 1 1 Regular Gasket | Gasket |
| M-1978418 | 1 Turbo Oil Supply Gasket | Gasket |
| M-1P0451 | 1 3 3/4in x 4 1/4in Turbo Mounting Gasket | Gasket |
| M-1P436 | 1 Fuel Priming Pump Gasket | Gasket |
| M-1S7057 | 1 1 Valve Cover Gasket | Gasket |
| M-2097290 | 1 Oil Pan Gasket | Gasket |
| M-2097293 | 1 Oil Cooler Core Gasket | Gasket |
| M-2175701 | 2 Valve Cover Gasket | Gasket |
| M-2192340 | 1 Regulator Housing Gasket 2pc Housing | Gasket |
| M-2213494 | 1 Valve Cover Gasket | Gasket |
| M-2223915 | Regulator Gasket 29 | Gasket |
| M-2225915 | 1 Regulator Gasket | Gasket |
| M-2337655 | 1 Inner Oil Cooler Gasket | Gasket |
| M-2585646 | 1 Intake Manifold Cover Gasket | Gasket |
| M-2613816 | 1 Oil Pickup Tube Gasket | Gasket |
| M-2692904 | 1 Turbo Oil Drain Gasket | Gasket |
| M-2850365 | 1 Turbo Mounting Gasket | Gasket |
| M-2S0795 | 2 Core Gasket | Gasket |
| M-2W7212 | 1 1 Regular Gasket | Gasket |
| M-3K360 | 1 Oil Pan Gasket | Gasket |
| M-4502539 | Gasket Set - Front Structure | Gasket |
| M-4532206 | Gasket Set - Front Structure | Gasket |
| M-4551697 | Gasket Set - Front Structure | Gasket |
| M-4568332 | Gasket Set - Front Structure | Gasket |
| M-4589490 | Gasket Set - Rear Structure | Gasket |
| M-4590197 | Gasket Set - Oil Cooler & Lines | Gasket |
| M-4716555 | Gasket Set - Single CYL Head | Gasket |
| M-4P1624 | 1 Intake Manifold Gasket | Gasket |
| M-4Y9652 | 2 3 Exhaust Manifold Gasket | Gasket |
| M-6I3033 | 1 1 Front Cover Gasket | Gasket |
| M-6V8260 | 1 Cam Follower Cover Gasket | Gasket |
| M-7C1151 | 1 Intake Manifold Cover Gasket | Gasket |
| M-7C1159 | 1 Intake Manifold Cover Gasket | Gasket |
| M-7C1162 | 1 Inner Oil Cooler Gasket | Gasket |
| M-7C1163 | 1 Outer Oil Cooler Gasket | Gasket |
| M-7C7431 | 1 1 Turbo Oil Drain Gasket | Gasket |
| M-7M7273 | 1 Water Cooled Valve Cover Gasket Upper | Gasket |
| M-7W2398 | 1 1 Turbo Oil Supply Gasket | Gasket |
| M-7W5340 | 1 1 Regulator Gasket | Gasket |
| 193-2785 | Hose | Hose |
| 193-2786 | Hose | Hose |
| 230-2930 | Hose | Hose |
| 230-2931 | Hose | Hose |
| 093-7521 | Filter hydraulic | Hydraulic filter |
| 1R0774 | Filter hydraulic | Hydraulic filter |
| 1R0777 | Filter hydraulic | Hydraulic filter |
| 328-3655 | Filter hydraulic/transmission | Hydraulic filter |
| M-0328970 | 4 6 Injector O-Ring - Lower | Injector |
| M-1148718 | 6 Injector O-Ring - Upper HEUI | Injector |
| M-1193061 | 4 6 Injector Tube | Injector |
| M-1258274 | 6 Injector O-Ring - Lower HEUI | Injector |
| M-1278213 | 4 6 Fuel Injector - MUI | Injector |
| M-1278216 | 4 6 Fuel Injector - MUI | Injector |
| M-1278218 | 4 6 Fuel Injector - MUI | Injector |
| M-1278222 | 4 6 Fuel Injector - MUI | Injector |
| M-1278225 | 4 6 Fuel Injector - MUI | Injector |
| M-2271200 | 6 Injector Tube | Injector |
| M-2272911 | 6 Injector Tube | Injector |
| M-2291490 | 6 Injector Tube | Injector |
| M-4P2995 | 4 6 Fuel Injector - MUI | Injector |
| M-4P8577 | 4 6 Pushrod - Injector | Injector |
| M-6V6228 | 4 6 Injector O-Ring - Upper | Injector |
| 296-8325 | Crankcase Ventilation (CV) Filter | Ocv filter cartridge |
| 102-2828 | Filter oil | Oil filter |
| 126-2081 | Filter oil | Oil filter |
| 1R-1808 | Engine Oil - ADV | Oil filter |
| 1R0716 | Filter oil | Oil filter |
| 1R0719 | Filter oil | Oil filter |
| 1R1808 | Filter oil | Oil filter |
| M-3P1156 | 2 Oil Filter Base Gasket | Oil filter |
| P01-511-000 | Oil Filter | Oil filter |
| P01-532-000 | Oil Filter | Oil filter |
| 128-4124 | Kit without Conditioner | Service part / kit |
| 1608199 | Connecting rod | Service part / kit |
| 163-1128 | Kit with Liquid | Service part / kit |
| 163-1129 | Kit with Element | Service part / kit |
| 22101935 | MACHINE ID PLUG 1.78K OHMS | Service part / kit |
| 22101943 | MACHINE ID PLUG 10.5K OHMS | Service part / kit |
| 22101968 | INLET HEATER BREAKER 120 AMPS | Service part / kit |
| 22173579 | WEDGE CONTROLLER | Service part / kit |
| 304-7755 | Cat Regeneration System | Service part / kit |
| 305-2389 | Wire Brush | Service part / kit |
| 35577873 | RELAY MAGNETIC 24 VOLT K1 | Service part / kit |
| 36840841 | 24 VOLT SOLENOID | Service part / kit |
| 36841526 | CONTROL HEATER | Service part / kit |
| 36842300 | START/RUN SOLENOID VALVE | Service part / kit |
| 36842318 | COMPRESSOR SOLENOID VALVE | Service part / kit |
| 36850691 | COMPRESSOR MOTOR | Service part / kit |
| 36853521 | INLET HEATER RELAY | Service part / kit |
| 36854677 | REGULATOR HEATER | Service part / kit |
| 36892362 | 24V SEALED RELAY | Service part / kit |
| 36896975 | SW MASTER DISCONNECT | Service part / kit |
| 888-983-7847 | ENGINE BLOCK CRANKSHAFT | Service part / kit |
| 8889837647 | LOCK RETAINER | Service part / kit |
| 89303127 | EMERGENCY STOP OPERATOR | Service part / kit |
| 89303135 | NC E-STOP CONTACT BLOCK | Service part / kit |
| 8T1589 | Maintenance Charge | Service part / kit |
| 8T9190 | Refill Charge | Service part / kit |
| AEHQ5727-01 | Not explicitly stated in the document. | Service part / kit |
| AEHQ5761-03 | D6T Track-Type Tractor specifications | Service part / kit |
| AEHQ5917-01 | Travel third pedal | Service part / kit |
| AEHQ7040 | 24V DC, Two 12V batteries, Halogen cab and boom lights, Engine and hydraulic compartments service lights, Sealed wiring enclosures | Service part / kit |
| M-0L1026 | 2 Cup Plug | Service part / kit |
| M-0L364 | 2 Exhaust Manifold Lock | Service part / kit |
| M-1011530 | 3 3 Main Bearing - STD | Service part / kit |
| M-1014495 | 3 11 5RM | Service part / kit |
| M-1077545 | 20 4KR IND | Service part / kit |
| M-1077553 | 7 3RJ TRUCK | Service part / kit |
| M-1077563 | 22 11 2FG | Service part / kit |
| M-1077604 | 6 6 Cylinder Salvage Sleeve | Service part / kit |
| M-1077708 | 1 3 Main Bearing - STD | Service part / kit |
| M-1136200 | 2 3 Exhaust Manifold Lock | Service part / kit |
| M-1154124 | CB634/3BR-5CL 39 | Service part / kit |
| M-1154223 | 1 Regulator - 97ºC | Service part / kit |
| M-1163715 | 12 -Stud Taperlock* | Service part / kit |
| M-1193045 | 6 Valve Spring - Intake | Service part / kit |
| M-1193075 | 1 1 Regular - 94ºC | Service part / kit |
| M-1227375 | 6 Valve Guide - Exhaust | Service part / kit |
| M-1243686 | 1 Oil Cooler Set | Service part / kit |
| M-1265869 | 1 Regular - 94ºC | Service part / kit |
| M-1275537 | 1 Oil Cooler Core Transmission | Service part / kit |
| M-1279810 | 1 Exhaust Manifold Lock | Service part / kit |
| M-1334983 | 40 11 9ZR | Service part / kit |
| M-1335037 | 6 Spring Retainer - Exhaust 0.540in Thick | Service part / kit |
| M-1335044 | 25 11 6MS | Service part / kit |
| M-1344483 | 6 6 Spring Retainer - Exhaust | Service part / kit |
| M-1360819 | 4 6 Valve - Exhaust | Service part / kit |
| M-1371260 | 1 Fuel System Set | Service part / kit |
| M-1376715 | 6 6 Spring Seat - Exhaust | Service part / kit |
| M-1376718 | 6 6 Valve Spring - Exhaust | Service part / kit |
| M-1406188 | 12 12 Valve Spring - Intake | Service part / kit |
| M-1409670 | 12 12 Valve Guide - Intake | Service part / kit |
| M-1419501 | 1 Fuel System Set | Service part / kit |
| M-1422222 | 1 Oil Cooler Set | Service part / kit |
| M-1427307 | 100 11 2FR | Service part / kit |
| M-1443444 | 100 4ES TRUCK | Service part / kit |
| M-1450162 | 1 3 Main Bearing - 0.25mm OS | Service part / kit |
| M-1450163 | 3 3 Main Bearing - 0.25mm OS | Service part / kit |
| M-1450164 | 1 3 Main Bearing - 0.50mm OS | Service part / kit |
| M-1450165 | 3 3 Main Bearing - 0.50mm OS | Service part / kit |
| M-1457390 | 12 12 Valve - Intake | Service part / kit |
| M-1478211 | 6 6 Valve - Exhaust | Service part / kit |
| M-1478218 | 6 Valve Seat - Exhaust | Service part / kit |
| M-1478220 | 6 6 Valve Guide - Exhaust | Service part / kit |
| M-1504621 | 26 11 3TR | Service part / kit |
| M-1512939 | 7 Main Bearing - STD | Service part / kit |
| M-1548853 | 1 Air Compressor Set Machine | Service part / kit |
| M-1559504 | 12 Valve Seat - Intake | Service part / kit |
| M-1560235 | 2 5 Exhaust Manifold Lock | Service part / kit |
| M-1564179 | 1 Air Compressor Set Industrial | Service part / kit |
| M-1577129 | 12 Valve - Intake | Service part / kit |
| M-1577130 | 6 Valve - Exhaust | Service part / kit |
| M-1608194 | 6 Connecting Rod Bushing | Service part / kit |
| M-1614280 | 6 Valve - Intake | Service part / kit |
| M-1632442 | 12 Valve - Intake | Service part / kit |
| M-1635735 | 1 Fuel System Set | Service part / kit |
| M-1639063 | 6 Valve Seat - Intake | Service part / kit |
| M-1646556 | 33 11 6MK | Service part / kit |
| M-1654265 | 34 9ZF MARINE | Service part / kit |
| M-1662905 | 1 1 Intergral Style | Service part / kit |
| M-1663648 | 6 Piston Pin | Service part / kit |
| M-1687224 | 6 6 Piston Pin | Service part / kit |
| M-1687226 | 6 6 Piston Pin - Articulated | Service part / kit |
| M-1750454 | 14 Main Cap Bolt | Service part / kit |
| M-1753671 | 100 11 BEJ | Service part / kit |
| M-1767688 | 12 Valve Seat - Intake | Service part / kit |
| M-1767690 | 12 Valve Seat - Exhaust | Service part / kit |
| M-1874123 | 12 Valve - Intake Marine | Service part / kit |
| M-1883122 | 12 Valve - Exhaust | Service part / kit |
| M-1903562 | 6 Cylinder Liner | Service part / kit |
| M-1906115 | 24 Valve Spring - Inner | Service part / kit |
| M-1906117 | 24 Valve Spring - Outer | Service part / kit |
| M-1966929 | 1 Fuel System Set | Service part / kit |
| M-1966931 | 1 Oil Cooler Set | Service part / kit |
| M-1979297 | Note: For Wet Housing Units Order QTY-1 M-2854074 Rear Seal 1 31 | Service part / kit |
| M-1979340 | G3E TRUCK | Service part / kit |
| M-1979345 | Note: Engine Kits DO NOT INCLUDE the seals and gaskets for the Aftercooler, Heat Exchanger, Seawater | Service part / kit |
| M-1979368 | 13 C9J | Service part / kit |
| M-1979371 | 6 Piston Pin | Service part / kit |
| M-1979372 | Piston Pin Retainer 6 | Service part / kit |
| M-1W2713 | 4 6 Valve Seat - Exhaust | Service part / kit |
| M-1W2715 | 16 24 Valve Lock | Service part / kit |
| M-2035805 | 2 Camshaft Bushing - Intermediate | Service part / kit |
| M-2036090 | 1 Camshaft Bushing - Rear | Service part / kit |
| M-2107440 | 1 Expansion Tank Set | Service part / kit |
| M-2107445 | 1 Water Lines Set | Service part / kit |
| M-2112134 | 24 Valve Spring - Retainer | Service part / kit |
| M-2124893 | 1 1 Main Bearing - STD | Service part / kit |
| M-2128917 | 12 Valve Seat - Exhaust Marine | Service part / kit |
| M-2128918 | 12 Valve Seat - Intake Marine | Service part / kit |
| M-2133190 | 6 Connecting Rod Bearing - STD | Service part / kit |
| M-2133193 | 4 6 Connecting Rod Assembly | Service part / kit |
Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.
The Caterpillar CAT C9 ATAAC engine has an oil capacity of 39.0 liters.
The Caterpillar CAT C9 ATAAC has a displacement of 8.8 liters with 6 cylinders.
The Caterpillar CAT C9 ATAAC powers 1 generator set(s), including Caterpillar CAT C9 ATAAC.