Cummins 6LTAA8.9-G3 Specifications
| Engine Model: Cummins 6LTAA8.9-G3 |
| Engine Type: 4-cycle inline 6-cylinder direct injection liquid-cooled diesel |
| Total Displacement: 543 cu.in (8.9 L) |
| Rated Engine Power: 335-442 Hp (250-330 kW) at 1800 rpm |
| Aspiration Type: Turbocharged and aftercooled |
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The Cummins 6LTAA8.9-G3 is a high-performance,
turbocharged and turbo-aftercooled 8.9-liter inline-six industrial
diesel engine engineered for generator-drive, construction, mining, and
agricultural applications. As part of the Cummins L-Series, the
6LTAA8.9-G3 is known for its robust cast-iron construction, high torque
output, excellent load response, and long overhaul life. It bridges the
gap between the 8.3-liter C-Series and the 11-liter N/L-Series engines,
providing high power density while maintaining mechanical simplicity and
exceptional durability.
The engine uses a mechanical fuel system in the G3 configuration, making
it suitable for demanding environments where electronic controls may be
difficult to maintain. The combination of turbocharging and air-to-air
aftercooling significantly improves power output, altitude performance,
and fuel efficiency. This engine is widely used in large generator sets,
heavy equipment, mining machinery, agricultural tractors, industrial
pumps, and marine auxiliary systems.
The Cummins 6LTAA8.9-G3 is a four-stroke, turbocharged and aftercooled,
water-cooled inline six-cylinder diesel engine with a displacement of
8.9 liters (543 cubic inches). Bore is approximately 114 mm (4.49 in)
and stroke is approximately 144.5 mm (5.69 in), giving the engine a
long-stroke configuration optimized for torque and heavy-duty cycles.
Compression ratio typically ranges from 16.3:1 to 17.2:1 depending on
fuel-system calibration.
Generator-drive power ratings:
– Prime power: 250–300 kW (335–402 hp) at 1,500–1,800 rpm
– Standby power: 275–330 kW (369–442 hp) at 1,500–1,800 rpm
Industrial output ratings: 280–400 hp (209–298 kW) at 1,800–2,100 rpm
Peak torque: 1,350–1,650 Nm (996–1,218 lb-ft) at 1,300–1,600 rpm
Idle speed: 650–750 rpm
Governed speeds: 1,500 rpm (50 Hz) / 1,800 rpm (60 Hz)
Firing order: 1-5-3-6-2-4.
The crankshaft is forged steel with seven main bearings. Pistons are
cast or steel-crown composite units with internal cooling galleries.
Connecting rods are forged steel with replaceable bearings. The camshaft
is gear-driven for lifetime timing accuracy.
The block is heavy-duty cast iron with parent-bore cylinders machined
directly into the structure.
Features include:
– Deep-skirt block construction
– Reinforced ribbing for structural stiffness
– Full water-jacketed bores for effective cooling
– Large main-bearing saddles for stability
The block supports multiple rebores depending on wear tolerance.
The cylinder head is cast iron and
incorporates:
– Direct-injection combustion chambers
– Two valves per cylinder
– Hardened exhaust and intake valve seats
– Mechanical rocker arms actuated by the camshaft
Cold valve-lash specifications:
– Intake: 0.254 mm (0.010 in)
– Exhaust: 0.508 mm (0.020 in)
The head is engineered for high thermal and mechanical loading common in
generator and industrial use.
The 6LTAA8.9-G3 uses a fully mechanical direct-injection fuel system for
maximum durability and simplicity.
Fuel-system components:
– Mechanical lift pump
– Bosch-style inline mechanical injection pump
– Multi-hole mechanical injectors
– Fuel-water separator
– High-efficiency secondary filter
Injection pressure: typically 300–450 bar depending on pump calibration.
Fuel-system maintenance:
– Replace filters every 250–300 hr
– Drain water separator daily
– Test injectors every 1,000–1,500 hr
– Check pump timing at major overhaul intervals.
A full-pressure wet-sump lubrication system is used.
Oil capacity: 22–28 liters (23–29.6 qt)
Oil pressure:
– 300–450 kPa (44–65 psi) operating
– 70–100 kPa (10–15 psi) idle
Recommended oil: SAE 15W-40 meeting API CI-4 / CJ-4 / CK-4
Typical oil-change interval: 250 hr.
Cooling components include:
– Belt-driven centrifugal water pump
– Thermostat-controlled coolant flow
– Full cooling jacket in block and head
– Oil cooler integrated into system
– Radiator or remote cooling options
Thermostat:
– Begins opening: 82°C (180°F)
– Fully open: 95°C (203°F)
Cooling-system capacity: 30–38 liters (32–40 qt)
System pressure: 70–100 kPa (10–15 psi).
Aftercooling - “AA” designation indicates
air-to-air aftercooling (ATAAC), providing:
– Lower intake charge temperatures
– Improved power
– Reduced emissions
– Increased durability under continuous high load
| Intake and Exhaust Systems |
Air-intake system includes:
– Industrial dry-type air cleaner
– Optional dual-stage filters
– Optional cyclone pre-cleaners
Turbocharger:
– High-flow fixed-geometry turbocharger
– Oil-lubricated bearings
– Designed for extreme continuous load
Exhaust system:
– High-temperature cast-iron manifold
– Generator-grade exhaust elbows optional.
| Electrical and Starting Systems |
Available in 12V or 24V configurations.
Standard components:
– Starter (3–5 kW)
– Alternator (35–70 amps)
– Sensors for oil pressure, coolant temperature, and speed
The 6LTAA8.9-G3 is fully mechanical; it does not use ECM control.
Depending on configuration, the engine may
include:
– SAE generator housing options
– Hydraulic pump mounting points
– PTO drives
– Belt-driven auxiliaries
– Remote radiator hookups
– Marine PTO configurations.
Approximate physical dimensions:
– Length: 1,250–1,350 mm (49–53 in)
– Width: 800–950 mm (31–37 in)
– Height: 1,150–1,250 mm (45–49 in)
Dry weight: 650–750 kg (1,433–1,653 lb).
Routine intervals include:
– Oil and filter: 250 hr
– Fuel filters: 250–300 hr
– Air filter: inspect every 50–100 hr
– Valve-lash adjustment: every 1,000 hr
– Injector service: every 1,000–1,500 hr
– Coolant replacement: every 2 years
– Compression test: every 2,000 hr
– Belt inspection: each service.
– Cylinder-head bolts: 270–300 Nm (199–221 lb-ft) + angle torque
– Main-bearing caps: 400–450 Nm (295–332 lb-ft)
– Connecting-rod bolts: 110–130 Nm (81–96 lb-ft)
– Flywheel bolts: 280–320 Nm (207–236 lb-ft)
– Crankshaft damper bolt: 450–550 Nm (332–406 lb-ft)
– Oil drain plug: 40–55 Nm (30–41 lb-ft)
– Injector hold-down: 25–30 Nm (18–22 lb-ft).
The Cummins 6LTAA8.9-G3 is widely used in:
– Generator sets (250–330 kW class)
– Agricultural tractors
– Wheel loaders
– Excavators
– Rock crushers
– Mining equipment
– Telehandlers
– Pumps and compressors
– Marine auxiliary engines
– Construction machinery.
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