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Cummins 4BTAA3.3-G11 Engine

The Cummins 4BTAA3.3-G11 is a rugged, 4-cycle, inline 4-cylinder diesel engine engineered specifically for generator drive (G-Drive) applications, typically powering 62.5 kVA / 50 kWe diesel generator sets. It belongs to the heavy-duty B3.3 series and features advanced in-cylinder combustion technology to provide superior structural reliability, high power output per liter, and exceptional transient response to abrupt load changes without requiring auxiliary exhaust after-treatment devices. Utilizing a cast iron cylinder block and head assembly, the engine is configuration-optimized with a dry-type turbocharger and an air-to-air charge cooling system (indicated by the "AA" designation) to achieve maximum thermal efficiency and structural longevity.

Fuel Injection Pump Configuration: Mechanical inline fuel injection pump operating as a direct-injection (DI) system. Governing Regulation: Equipped with a mechanical RSV type speed governor ensuring steady-state frequency regulation within factory-mandated tolerances. Filtration Assembly: High-efficiency, spin-on primary fuel filter system integrated with a physical water separator element and an electrical water-in-fuel (WIF) warning sensor.

Lubrication System: Full-pressure lubrication delivered via an engine-driven internal gear pump. Filtration Type: Single, spin-on full-flow oil filter canister mounted to the filter header. Lubrication Maintenance: Factory service intervals are engineered for 500 hours or 1 operational year under nominal load. The system requires heavy-duty diesel engine oil matching or exceeding service category API CF-4/CH-4.

Cooling System: Pressurized, closed-loop jacket water liquid cooling system. Thermal Management Hardware: Equipped with an engine-driven water pump, heavy-duty pusher fan, and a mechanical thermostat assembly designed to open fully between standard jacket temperatures. Coolant Mixture: Standard operation requires a 50/50 ratio configuration of ethylene glycol anti-freeze and treated water.

General Technical Data

Engine Specifications

Engine Model ............... Cummins 4BTAA3.3-G11
Engine Type ............... 4-cycle inline 4-cylinder direct injection turbocharged liquid-cooled diesel
Number of Cylinders ............... 4
Cylinder Arrangement ............... In-line
Engine Bore, in (mm) ............... 3.74 (95.0)
Engine Stroke, in (mm) ............... 4.53 (115.0)
Displacement, cu.in (L) ............... 199 (3.3)
Rated Engine Power, hp (kW) ............... 60-88 (45-66)
Rated Engine Speed, rpm ............... 1500-1800
Peak Torque ............... 220-300 Nm (162-221 lb-ft) at 1400-1600 rpm
Idle Speed ............... 750-900 rpm
Aspiration Type ............... Turbocharged and aftercooled
Compression Ratio ............... 17.5:1
Firing Order ............... 1-3-4-2
Cylinder Block Type ............... Cast iron
Cylinder Head Type ............... Cast iron
Lubrication System ............... Full-pressure
Oil Pump Type ............... Gear-driven
Oil Filter Type ............... Full-flow, spin-on
Cooling System ............... Liquid-cooled
Water Pump Type ............... Belt-driven, centrifugal
Air Cleaner Type ............... Dry dual-stage
Starting System ............... Electric Starter
Electrical System ............... 12V or 24V
Alternator Rating, Amps ............... 35-70

Fuel System

Fuel System ............... Direct injection
Injection Pump Type ............... Rotary
Fuel System Control ............... Mechanical
Governor Type ............... Mechanical
Fuel Injector Type ............... Multi-hole
Fuel Type ............... Diesel Fuel

Dimensions and Weight

Overall Length, in (mm) ............... 33.5-37.4 (850-950)
Overall Width, in (mm) ............... 25.6-29.5 (650-750)
Overall Height, in (mm) ............... 35.4-41.4 (900-1050)
Dry Weight, lbs (kg) ............... 570-725 (260-330)

Maintenance Data

Service Information

Thermostat begins opening ............... 82C (180F)
Thermostat fully open ............... 95C (203F)
Cooling system pressure ............... 70-100 kPa (10-15 psi)
Operating oil pressure ............... 300-450 kPa (44-65 psi)
Idle oil pressure ............... 100-150 kPa (15-22 psi)
Intake Valve Clearance, in (mm) ............... 0.254 (0.010)
Exhaust Valve Clearance, in (mm) ............... 0.508 (0.020)

Engine Oil and Coolant

Engine Oil Type .................. SAE 10W-30, 15W-40
API Service Classifications ......................... CI-4, CJ-4, or CK-4
Engine Oil Capacity, qts (L) .................. 8.4-10.5 (8.0-10.0)
Coolant Capacity, qts (L) ............... 10.5-14.7 (10.0-14.0)

Service Intervals

Change oil and filter ............... Every 250 hours
Replace fuel filters ............... Every 300 hours
Inspect air filter ............... Every 100 hours
Replace air filter ............... Every 300 hours
Change coolant ............... Every 2000 hours
Valve-lash adjustment ............... Every 1000 hours
Injector inspection ............... Every 1000-1500 hours
Compression test ............... Every 2000 hours
Drain water separator ............... As required
Belt inspection ............... As required

Service Specifications

Cylinder Bore Inside Diameter, in (mm) ............... 3.7402-3.7413 (95.000-95.030)
Crankshaft Journal Outside Diameter, in (mm) ............... 2.7248-2.7256 (69.210-69.230)
Crank Pin Outside Diameter, in (mm) ............... 2.2405-2.2413 (56.910-56.930)
Crankshaft End Play, in (mm) ............... 0.0052-0.0138 (0.131-0.351)
Intake Valve Stem Outside Diameter, in (mm) ............... 0.2740-0.2746 (6.960-6.975)
Exhaust Valve Stem Outside Diameter, in (mm) ............... 0.2734-0.2740 (6.945-6.960)
Intake Valve Guide Inside Diameter (Installed), in (mm) ............... 0.2756-0.2762 (7.000-7.015)
Exhaust Valve Guide Inside Diameter (Installed), in (mm) ............... 0.2756-0.2762 (7.000-7.015)
Intake Valve Stem to Guide Clearance, in (mm) ............... 0.0010-0.0022 (0.025-0.055)
Exhaust Valve Stem to Guide Clearance, in (mm) ............... 0.0016-0.0028 (0.040-0.070)
Intake Valve Spring Free Length, in (mm) ............... 1.9370 (49.20)
Exhaust Valve Spring Free Length, in (mm) ............... 1.9370 (49.20)
Intake Cam Height, in (mm) ............... 1.6343-1.6358 (41.510-41.550)
Exhaust Cam Height, in (mm) ............... 1.6343-1.6358 (41.510-41.550)
Piston Pin Outside Diameter, in (mm) ............... 1.1811-1.1813 (30.000-30.006)
Piston Pin to Piston Bore Clearance, in (mm) ............... 0.0002-0.0006 (0.004-0.015)
Second Ring Side Clearance, in (mm) ............... 0.0012-0.0028 (0.030-0.070)
Oil Ring Side Clearance, in (mm) ............... 0.0012-0.0028 (0.030-0.070)
Top Ring End Gap, in (mm) ............... 0.0110-0.0150 (0.280-0.380)
Second Ring End Gap, in (mm) ............... 0.0157-0.0197 (0.400-0.500)
Oil Ring End Gap, in (mm) ............... 0.0079-0.0157 (0.200-0.400)

Tightening Torque Specs

Cylinder head bolts ............... 135-150 Nm (100-111 lb-ft)
Main bearing caps ............... 175-190 Nm (129-140 lb-ft)
Connecting rod bolts ............... 65-75 Nm (48-55 lb-ft)
Flywheel bolts ............... 100-120 Nm (74-89 lb-ft)
Crankshaft pulley bolt ............... 200-225 Nm (148-166 lb-ft)
Glow plugs ............... 10-15 Nm (7-11 lb-ft)
Oil drain plug ............... 40-50 Nm (30-37 lb-ft)
Injector hold-down bolts ............... 20-25 Nm (15-18 lb-ft)

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• Cummins Engines Specs
  
• Cummins 4B3.9-G2 Specs
  
• Cummins 4B3.9-G11 Specs
  
• Cummins 4BT3.9-G2 Specs
  
• Cummins 4BTA3.9-G2 Specs
  
• Cummins 4BTA3.9-G11 Specs
  
• Cummins 4BTAA3.9 Specs
  

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