Cummins 6BTAA5.9-G12 Specifications
| Engine Model: Cummins 6BTAA5.9-G12 |
| Engine Type: 4-cycle inline 6-cylinder direct injection liquid-cooled diesel |
| Total Displacement: 359 cu.in (5.9 L) |
| Rated Engine Power: 228-295 Hp (170-220 kW) at 1800 rpm |
| Aspiration Type: Turbocharged and aftercooled |
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The Cummins 6BTAA5.9-G12 is a turbocharged,
turbo-aftercooled, mechanically governed 5.9-liter inline six-cylinder
diesel engine designed primarily for generator-drive and heavy
industrial applications. As part of the legendary Cummins B-Series, the
6BTAA5.9-G12 offers outstanding durability, strong low-end torque,
exceptional fuel efficiency, and robust performance in harsh duty
cycles. It is an upgraded, high-power variant of the 6BTA/6BT series,
delivering improved charge-air density and better thermal stability due
to its air-to-air aftercooling system. Known for simplicity and
world-class reliability, the 6BTAA5.9-G12 is widely used in gensets,
agricultural tractors, construction machinery, mining equipment, pumps,
compressors, and marine auxiliary systems.
With fully mechanical fuel control, a heavy cast-iron structure, and
gear-driven components, the 6BTAA5.9-G12 is engineered for long
operation hours, low maintenance costs, and ease of servicing–making it
one of the most trusted engines in regions where fuel quality may vary
and electronic control systems may be difficult to support.
The Cummins 6BTAA5.9-G12 is a four-stroke, turbocharged and aftercooled,
water-cooled inline six-cylinder diesel engine. Total displacement is
5.9 liters (359 cubic inches). Bore is 102 mm (4.02 in), stroke is 120
mm (4.72 in), giving the engine a long-stroke torque-focused design
ideal for industrial and generator duties.
Power ratings for generator-drive G12
configuration:
– Prime: 150–170 kW (201–228 hp) @ 1,500 rpm, or 170–200 kW (228–268 hp)
@ 1,800 rpm
– Standby: 165–188 kW (221–252 hp) @ 1,500 rpm, or 188–220 kW (252–295
hp) @ 1,800 rpm
Peak torque: 750–950 Nm (553–701 lb-ft) @ 1,400–1,600 rpm. Idle speed
typically ranges between 700 and 800 rpm. Firing order: 1-5-3-6-2-4.
Compression ratio is approximately 17.5:1, depending on fuel setting and
emissions configuration.
Governed speed:
– 1,500 rpm (50 Hz)
– 1,800 rpm (60 Hz)
The crankshaft is a forged-steel, fully counterweighted unit supported
by seven main bearings. Pistons are high-strength aluminum alloy with
reinforced crowns and cooled via internal oil galleries. Connecting rods
are forged steel with replaceable bearing inserts. The camshaft is
gear-driven for precision valve timing and long-term durability.
The block is a deep-skirt cast-iron structure with parent-bore
cylinders. It is designed for excellent stiffness, vibration damping,
and thermal stability.
Features include:
– High-strength cast iron construction
– Heavy ribbing for structural integrity
– Robust main-bearing saddles
– Full water-jacketed cylinder walls for uniform cooling
Parent bores allow multiple rebores during overhaul as long as
tolerances remain acceptable.
The cast-iron cylinder head houses:
– Direct-injection combustion chambers
– Two intake and two exhaust valves per cylinder
– Hardened valve seats and guides
– Mechanical rocker-arm valvetrain
Cold valve lash:
– Intake: 0.254 mm (0.010 in)
– Exhaust: 0.508 mm (0.020 in).
An efficient swirl design in the combustion
chamber ensures improved air-fuel mixing and better emission
characteristics.
The engine features a fully mechanical direct-injection fuel system for
maximum reliability in remote or severe environments.
Fuel-system components:
– Mechanical lift pump
– Bosch-type inline mechanical injection pump
– Multi-hole direct-injection mechanical injectors
– Primary water-separating filter
– Secondary fine fuel filter
Injection pressures typically range between 250 and 400 bar.
Fuel maintenance:
– Replace filters every 250–300 hr
– Drain water separator daily
– Test injectors every 1,000–1,500 hr
– Inspect timing and calibration during overhaul.
The lubrication system is a full-pressure wet-sump arrangement with a
gear-driven oil pump providing consistent lubrication.
Oil capacity: 13–16 liters (13.7–16.9 qt)
Oil pressure:
– 275–380 kPa (40–55 psi) operating
– 70–100 kPa (10–15 psi) idle
Recommended oil: SAE 15W-40 diesel oil meeting API CI-4, CJ-4, or CK-4
Typical oil-change interval: 250 hours in generator applications.
Cooling is handled by a belt-driven
centrifugal water pump circulating coolant through:
– Block water jackets
– Cylinder head
– Oil cooler
– Radiator or remote cooling systems
Thermostat:
– Opens at 82°C (180°F)
– Fully open around 95°C (203°F)
Cooling-system capacity: approximately 20–25 liters (21–26 qt)
Cooling system pressure: 70–100 kPa (10–15 psi).
Aftercooler options:
– Air-to-air charge-air cooler (ATAAC) for maximum performance
– Air-to-water options in some OEM configurations
| Intake and Exhaust Systems |
The 6BTAA5.9-G12 incorporates:
– High-efficiency turbocharger
– Charge-air cooling through aftercooler
– Dry-type air cleaner
– Optional dual-stage filters
– Pre-cleaners for dusty environments
Turbocharging enhances altitude performance and reduces specific fuel
consumption. Exhaust manifolds are high-temperature cast iron designed
for repeated thermal cycling.
| Electrical and Starting Systems |
Electrical systems are available in 12V or 24V configurations.
Standard equipment includes:
– Starter motor (3–5 kW)
– Alternator (35–70 amps)
– Oil-pressure switch
– Coolant-temperature sensor
– Tachometer pickup
No ECM is used; the engine is fully mechanical.
Depending on OEM configuration, the engine
may support:
– SAE housing for generator head
– Hydraulic pump drives
– PTO pulley drives
– Marine auxiliary drives
– Remote radiator systems
– Belt-driven accessories.
Approximate physical dimensions:
– Length: 1,050–1,150 mm (41–45 in)
– Width: 700–800 mm (28–31 in)
– Height: 1,050–1,150 mm (41–45 in)
Dry weight: 480–520 kg (1,058–1,146 lb).
Routine maintenance includes:
– Oil and filter every 250 hr
– Fuel filters every 250–300 hr
– Air filter inspection every 50–100 hr
– Valve adjustment every 1,000 hr
– Injector service every 1,000–1,500 hr
– Coolant replacement every 2 years
– Compression testing every 2,000 hr
– Belt inspection each service interval.
– Cylinder-head bolts: 190–210 Nm (140–155 lb-ft) + additional angle
torque
– Main-bearing caps: 245–260 Nm (181–192 lb-ft)
– Connecting-rod bolts: 75–85 Nm (55–63 lb-ft)
– Flywheel bolts: 135–150 Nm (100–111 lb-ft)
– Crankshaft damper bolt: 270–300 Nm (199–221 lb-ft)
– Oil drain plug: 40–50 Nm (30–37 lb-ft)
– Injector hold-downs: 25–30 Nm (18–22 lb-ft).
The Cummins 6BTAA5.9-G12 is used
extensively in:
– Generator sets (150–220 kW class)
– Agricultural tractors
– Medium-duty trucks
– Wheel loaders
– Excavators
– Telehandlers
– Pumps and compressors
– Marine auxiliary systems
– Irrigation engines
– Construction and mining machinery.
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