Cummins LT10 Specifications
| Engine Model: Cummins LT10 |
| Engine Type: 4-cycle inline 6-cylinder direct injection liquid-cooled diesel |
| Total Displacement: 610 cu.in (10 L) |
| Rated Engine Power: 200-300 Hp (149-224 kW) at 2000 rpm |
| Aspiration Type: Turbocharged |
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The Cummins LT10 is a mid-range, heavy-duty,
turbocharged inline six-cylinder diesel engine developed for trucks,
buses, construction machinery, and industrial power units. As part of
Cummins’ L-Series lineage preceding the modern L10/M11/ISM engines, the
LT10 earned a reputation for robust durability, strong mid-range torque,
mechanical simplicity, and long overhaul life. Its cast-iron block,
mechanical fuel system, gear-driven components, and straightforward
valvetrain architecture made it especially reliable in harsh operating
environments.
The LT10 was widely used in vocational trucks, urban buses, agricultural
equipment, road construction machinery, stationary industrial
installations, and generator-drive applications. This engine provided an
excellent balance of serviceability, fuel efficiency for its class, and
rugged long-duration performance. Although superseded by more modern
electronic engines, the LT10 remains respected in legacy fleets
worldwide for its mechanical reliability and ease of overhaul.
The Cummins LT10 is a four-stroke, water-cooled, turbocharged inline
six-cylinder diesel engine. Displacement is approximately 10 liters (610
cubic inches). Bore measures 125 mm (4.92 in) and stroke is about 136 mm
(5.36 in), giving the engine a long-stroke design optimized for torque
and fuel-efficient combustion. Compression ratio typically ranges from
16.5:1 to 17.0:1 depending on configuration.
Power ratings varied by application:
– Truck/Bus applications: 230–300 hp (172–224 kW) @ 1,800–2,100 rpm
– Industrial and construction: 200–260 hp (149–194 kW)
– Generator-drive ratings: 150–220 kW @ 1,500–1,800 rpm
Peak torque: 1,050–1,250 Nm (774–922 lb-ft) @ 1,200–1,500 rpm
Idle speed: 600–700 rpm
Governed speed: 1,800–2,100 rpm
Firing order: 1-5-3-6-2-4.
The crankshaft is forged steel supported by seven main bearings. Pistons
are aluminum alloy with reinforced combustion bowls and oil cooling
galleries. Connecting rods are forged steel with replaceable bearings.
The camshaft is gear-driven for lifetime timing stability and minimal
maintenance.
The LT10 cylinder block is heavy-duty cast
iron with:
– Parent-bore cylinders
– Deep skirt and strengthened ribbing
– Wide main-bearing saddles
– Full water-jacket cooling around the cylinders
The block’s rigidity allows extended high-load operation and supports
multiple overhauls through standard reboring.
The cast-iron cylinder head features:
– Two valves per cylinder (one intake, one exhaust)
– Direct-injection combustion chambers
– Hardened valve seats and guides
– Mechanical rocker-arm valvetrain
Cold valve-lash clearances:
– Intake: 0.25 mm (0.010 in)
– Exhaust: 0.50 mm (0.020 in)
The head was engineered for durability under prolonged turbocharged
operation with high exhaust temperatures.
The LT10 uses a mechanical direct-injection fuel system.
Depending on variant, the system may
include:
– Bosch inline mechanical fuel-injection pump
– Mechanical lift pump
– Multi-hole direct-injection mechanical injectors
– Primary water separator
– Secondary fine fuel filter
Standard injection pressures: 250–400 bar depending on pump calibration.
Fuel-system maintenance:
– Replace filters every 250–300 hours
– Drain water separator daily
– Injector inspection every 1,000–1,500 hours
– Pump timing verification at major service intervals.
The full-pressure lubrication system
includes:
– Gear-driven oil pump
– Full-flow and bypass filtration
– Oil jets for piston cooling
Oil capacity: 24–30 liters (25–32 qt)
Operating oil pressure: 275–380 kPa (40–55 psi)
Idle pressure: 70–100 kPa (10–15 psi)
Recommended oil:
– SAE 15W-40
– API CI-4, CJ-4, or CK-4
Oil-change interval: 250 hours in industrial duty; shorter in severe
environments.
The LT10 cooling system includes:
– Belt-driven centrifugal water pump
– Thermostat-controlled coolant flow
– Full engine water-jacketing
– Plate-style oil cooler
– Radiator or remote cooling system
Thermostat:
– Opening: 82°C (180°F)
– Full open: 95°C (203°F)
Cooling-system capacity: 30–40 liters (32–42 qt)
System pressure: 70–100 kPa (10–15 psi).
| Intake and Exhaust Systems |
Intake components include:
– Dry-type air filter
– Optional dual-stage filtration
– Optional cyclone pre-cleaners
Turbocharger:
– Fixed-geometry turbocharger
– Pressure-lubricated bearings
– High-flow compressor for improved mid-range torque
Aftercooling (certain LT10 variants):
– Air-to-air or air-to-water charge-air cooling
Exhaust system:
– Cast-iron manifold
– Industrial-grade exhaust elbows in genset applications.
| Electrical and Starting Systems |
The LT10 electrical features:
– 12V or 24V starting system
– 35–70 amp alternator
– Oil-pressure switch
– Coolant-temperature sender
– Tachometer pickup
The LT10 is fully mechanical and does not include an ECM.
Optional and application-dependent systems:
– PTO drive pads
– Hydraulic pump mounts
– Air-compressor drive
– Remote radiator connections
– Generator-housing adaptors
– Front- and rear-mounted accessory drives.
Approximate physical dimensions:
– Length: 1,250–1,400 mm (49–55 in)
– Width: 800–950 mm (31–37 in)
– Height: 1,100–1,250 mm (43–49 in)
Dry weight: 800–900 kg (1,764–1,984 lb).
Recommended service intervals:
– 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 testing: 1,000–1,500 hr
– Coolant replacement: every 2 years
– Compression testing: every 2,000 hr
– Turbocharger inspection: each major service.
– Cylinder-head bolts: 270–300 Nm (199–221 lb-ft) + angle
– Main-bearing caps: 400–450 Nm (295–332 lb-ft)
– Connecting-rod bolts: 110–130 Nm (81–96 lb-ft)
– Flywheel bolts: 220–260 Nm (162–192 lb-ft)
– Crankshaft damper bolt: 400–480 Nm (295–354 lb-ft)
– Oil drain plug: 40–55 Nm (30–41 lb-ft)
– Injector hold-down: 25–30 Nm (18–22 lb-ft).
The Cummins LT10 is widely used in:
– Medium-duty trucks (Kenworth, Peterbilt, Freightliner, International)
– City and intercity buses
– Agricultural tractors
– Wheel loaders and construction machinery
– Telehandlers and forklifts
– Industrial pumps and compressors
– Generator sets (150–220 kW)
– Drilling rigs and oilfield machinery
– Municipal and vocational vehicles.
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