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Caterpillar C27 ACERT Engine

The Caterpillar C27 ACERT is a 27 L 12-cylinder turbocharged-aftercooled engine rated at 2100 rpm, producing up to 783 kW. It powers generator sets from Caterpillar, including the 773. It holds 68.1 L (18.0 gal) of oil and 54.9 L (14.5 gal) of coolant.

Also known as: Caterpillar C27 ACERT

Part of the Caterpillar C27 engine family — 5 variants share parts & fitment.

27.0 L
Displacement
12
Cylinders
2100 rpm
Rated speed
783 kW
Gross power
On this pageSpecsGenerator setsMaintenanceFAQService intervalsTorque & specsFluidsProcedures

Engine specifications

Oil capacity68.1 L
Coolant capacity54.9 L
Displacement27.0 L
Cylinders12
AspirationTurbocharged-Aftercooled
Rated speed2100 rpm
Gross power783 kW

Maintenance schedule

ItemSpecCapacityPart #Interval
Coolant54.9 L—
Oil70.0 L—250 hr

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.

Service intervals

2
ItemActionHoursMonthsNotes
Primary air filter elementChange250 hrWhen changing the primary element at 250 operating hours (basis of the without-indicator filter-change comparison)
Secondary air filter elementChange750 hrWhen changing the secondary element at 750 operating hours (basis of the without-indicator filter-change comparison)

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Service specifications

27
TypeItemValueUnitCondition
OtherAir compressor air flow374L/min (13.2 cfm) @ 1250 rpmC7 ACERT, C9 ACERT
OtherAir compressor air flow445L/min (15.7 cfm) @ 1250 rpmC11 ACERT, C13 ACERT, C15 ACERT, C18 ACERT
OtherAir compressor air flow467L/min (16.5 cfm) @ 1250 rpmC7 ACERT, C9 ACERT
OtherAir compressor air flow889L/min (31.4 cfm) @ 1250 rpmC11 ACERT, C13 ACERT, C15 ACERT, C18 ACERT
OtherGross Input Torque (TH55-E70)12 667N•m (9350 lb-ft)
OtherGross Input Torque (TH55-E90)12 677N•m (9350 lb-ft)
OtherRadiator cooling package maximum elevation1524m (5000 ft)with 50/50 water/Extended Life Coolant mixture
OtherRating condition (diesel 7 L and higher)99 kPa (29.31 in Hg) dry barometer, 25°C (77°F)SAE J1995 inlet air standard
OtherRating condition (diesel up to 6.6 L)100 kPa (29.5 in Hg) total barometric pressure, 1 kPa (.295 in Hg) vapor pressure, 25°C (77°F)ISO/TR14396 inlet air standard
OtherRating condition (gas)100 kPa (29.61 in Hg) and 25°C (77°F)SAE J1349 standard
OtherStall Torque Ratio (TH55-E70)2.23
OtherStall Torque Ratio (TH55-E90)2.23
PressureWS255 pump plunger load238,000lb (107,960 kg)
PressureWS273XD pump plunger load275,000lb (124 738 kg)
PressureWS305XD pump plunger load250,000lb (113 398 kg)
SpeedMaximum Input Speed (TH55-E70/TH55-E90 transmissions)1970rpm
SpeedRated Input Speed (TH55-E70/TH55-E90 transmissions)1900rpm
TemperatureRadiator cooling package design ambient temperature48.9°C (120°F)coolant mixture 50/50 (water/Caterpillar Extended Life Coolant), maximum elevation 1524 m (5000 ft)
TorqueAir compressor SAE "A" hydraulic pump drive maximum torque (374 L/min and 467 L/min compressors)60N•m (44 lb-ft)C7, C9 ACERT
TorqueAir compressor maximum torque (374 L/min / 13.2 cfm @ 1250 rpm, C7/C9)60N·m (44 lb-ft)374 L/min (13.2 cfm) @ 1250 rpm
TorqueAir compressor maximum torque (467 L/min / 16.5 cfm @ 1250 rpm, C7/C9)60N·m (44 lb-ft)467 L/min (16.5 cfm) @ 1250 rpm
TorqueBearing Nut Torque (129-3253 Spanner Socket, 121-9871 Bearing Nut)2375N·m
TorqueBearing Nut Torque (129-3254 Spanner Socket, 119-3711 Bearing Nut)2375N·m
TorqueLocknut torque (260-0626 Spanner Socket Assembly, 1T-0229 High Torque Locknut)985N·m
TorqueSolenoid nut torque (FT3198 Solenoid Tool, 352-2733 solenoid)3.75Nm+/- .75
TorqueTightening torque for 369-5916 Lifting Eyebolt (M12 Hex Bit)115N·m
TorqueWorking torque capacity of locknut spanner wrenches (126-6608 / 126-6609)950N·m

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Recommended fluids

FluidGradeStandardAmbientCapacityNotes
Coolant50/50 (water/Caterpillar Extended Life Coolant)below 48°CRadiator cooling packages designed for up to 48.9°C (120°F) ambient up to a maximum elevation of 1524 m (5000 ft)
Coolant50/50 mixture water/Caterpillar Extended Life Coolantbelow 48°CRadiator cooling packages designed for up to 48.9° C (120° F) ambient; coolant sump refill capacities vary by oil sump/pan (18 L to 106 L service refill with new oil filter change)
Engine oilEPA 2D 89.330-96 (fuel reference, Diesel <6.6 L, density 0,845-0,850 kg/L a 15 °C)Reference condition only, not a lubricant recommendation
Engine oillow sulfated ash oilRequired for U.S. EPA Tier 4 Final, EU Stage IV engines.
FuelUltra Low Sulfur Diesel (ULSD)Contains less than or equal to 15 parts per million sulfur (mg/kg); required for U.S. EPA Tier 4 Final, EU Stage IV engines. B20 biodiesel capability available.
Fuel35° API gravity, LHV 42 780 kJ/kg (18,390 btu/lb)SAE J1995Diesel engines 7 liter and higher; used at 29°C (84.2°F) with density 838.9 g/L
FuelEPA 2D 89.330-96EPA 2D 89.330-96Diesel engines up to 6.6 liter; density 0.845-0.850 kg/L @ 15°C (59°F); fuel inlet temperature 40°C (104°F)
Fueldry natural gas, LHV 35.54 MJ/Nm3 (905 btu/ft3)Gas ratings based on SAE J1349 standard conditions of 100 kPa (29.61 in Hg) and 25°C (77°F)

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Procedures

3
Installation of two-piece seal into slack adjuster piston (209-6381 Seal Installer Group) maintenance

Tools: 207-3440 Loading Mandrel, 207-3442 Ring Pusher, 207-3444 Seal Sizer, 8F-8178 Bolt

  1. Place 207-3440 Loading Mandrel over small piston.
  2. Place inner portion of two-piece seal onto mandrel and push onto piston using 207-3442 Ring Pusher. Repeat for outer portion of seal.
  3. With both sets of seals installed, push piston assembly into 207-3444 Seal Sizer.
  4. Allow seals to compress for one minute and then install small piston into large piston.
Sprocket wheel removal - 8T-5243 Adapter Group installation maintenance

Tools: 8T-5243 Adapter Group, 7B-2499 Ring, 6H-4158 Pin, 5F-9306 Arm, 8S-9975 Ram Adapter, 9S-8900 Cylinder Group

  1. Install adapter groups evenly spaced in the holes in the sprocket flange; install the hooked adapter (1) first, then the plate (2).
  2. Fasten plate to adapter with two bolts (3) and washers (4); plate retains adapter in sprocket wheel.
  3. Before installing remainder of tooling, loosen bolt (5) to leave about 6.35 mm (0.25 in) gap between retainer (6) and sprocket wheel.
  4. Install the hydraulic cylinder and the remainder of the tooling in the conventional manner.
STOR Plug Assembly application for disc brake piston retainer spring (174-5354) repair

Tools: 174-5354 STOR Plug Assembly, 134-2562 Guides, 9S-9334 Plugs, 6N-9155 Pin

  1. Insert four 134-2562 Guides and discontinued 130-8718 Springs as an assembly into brake group anchor exterior holes where 9S-9334 Plugs are normally located.
  2. Insert four 174-5354 Plug Assemblies into exterior holes and finger tighten.
  3. Screw in attached bolts until guide noses protrude through brake piston.
  4. Insert discontinued 6N-9155 Pin into each guide hole and remove bolts and plugs.
  5. Insert four 9S-9334 Plugs into vacated holes.

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Parts cataloged across the Caterpillar C27 family

51
Part #DescriptionCategory
101564109Air ShutoffAir filter
50-ampAlternatorAlternator
1U-5490Hydrosolv 4165 liquid cleaner, 19 L (5 US gallon)Fluid
2S-3230Bearing Lubricant (grease)Fluid
5N-5561Silicone LubricantFluid
01908191OverspeedService part / kit
101147116Engine Operation with Active Diagnostic CodesService part / kit
101154196Engine Operation with Intermittent Diagnostic CodesService part / kit
101233590Before Starting EngineService part / kit
101446865Diagnostic LampService part / kit
101646248After Starting EngineService part / kit
102308903Starting with Jump Start CablesService part / kit
102327037Starting the Engine (EMCP II and EMCP II+ (If Equipped))Service part / kit
102512380Fault LoggingService part / kit
108-1760Ball Bearing (frame 321 BC)Service part / kit
108-1761Ball Bearing (frame 322 BC)Service part / kit
139-0349Bearing (Roller Bearing)Service part / kit
139-0350Bearing (Roller Bearing)Service part / kit
154-3032Ball Bearing (frame 326 BC)Service part / kit
174-6854Hydrosolv 100 liquid cleaner, 19 L (5 US gallon)Service part / kit
201-1240Heavy Penetration K130 TipsService part / kit
201-1241Heavy Abrasion K150 TipsService part / kit
229-7121General Duty K130 TipsService part / kit
229-7122Penetration K130 TipsService part / kit
229-7123Heavy Penetration K130 TipsService part / kit
229-7129K130 TipsService part / kit
229-7161Extra Duty K150 TipsService part / kit
229-7162Penetration Plus K150 TipsService part / kit
229-7163Heavy Penetration Plus K150 TipsService part / kit
229-7166Extra Duty K150 TipsService part / kit
241-4644Bearing (frame 320 BC / LC7)Service part / kit
243-5220Bearing (frame 315 BB)Service part / kit
253-9789Bearing (frame 1400 FR)Service part / kit
261-3545Bearing (frame 307 BB)Service part / kit
262-5921Bearing (frame 307 BC)Service part / kit
263-0161Bearing (frame 309 BC)Service part / kit
301108737Cold Weather StartingService part / kit
311-0843Ball Bearing (frame 1800 FR)Service part / kit
311-0844Ball Bearing (frame 1600 FR)Service part / kit
5N-4478Coupling plate assemblyService part / kit
5N-4479Shim 0.8 mm for coupling plateService part / kit
5N-4685Varnished cambric tape 15000VService part / kit
5N-4686Vinyl plastic electrical tapeService part / kit
5P-2448Ball Bearing (frames 580/590)Service part / kit
6Y-3955Ball Bearing (frame 450)Service part / kit
6Y-6488Ball Bearing (frame 597)Service part / kit
9S-3263Thread lockService part / kit
AD55BUnderground Articulated TruckService part / kit
AEHQ6350-02nullService part / kit
CR1-CR6Diodes in bridge rectifier circuitService part / kit
AEHQ5689-02Sound SuppressionSound suppression

Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.

Also used in

4
  • Caterpillar 24 — Grader
  • Caterpillar D10T — Tractor Tracked
  • Caterpillar MD6250 — Drilling Equipment
  • Caterpillar MD6290 — Drilling Equipment

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.

Common questions

What is the oil capacity of the Caterpillar C27 ACERT?

The Caterpillar C27 ACERT engine has an oil capacity of 68.1 liters.

What is the displacement of the Caterpillar C27 ACERT?

The Caterpillar C27 ACERT has a displacement of 27.0 liters with 12 cylinders.

Which generators use the Caterpillar C27 ACERT engine?

The Caterpillar C27 ACERT powers 2 generator set(s), including Caterpillar 773, Caterpillar C27 ACERT.

How often should you change the oil in the Caterpillar C27 ACERT?

The Caterpillar C27 ACERT oil change interval is every 250 hours.