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Cummins ISC-260 Specifications
| Engine Model: Cummins ISC-260 |
| Engine Type: 4-cycle 6-cylinder CAPS or common-rail fuel injection liquid-cooled diesel |
| Total Displacement: 505 cu.in (8.3 L) |
| Rated Engine Power: 260 Hp (194 kW) at 2200 rpm |
| Aspiration Type: Turbocharged and aftercooled |
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| General Technical Data |
The Cummins ISC-260 is a high-performance, electronically controlled, turbocharged, and aftercooled inline six-cylinder diesel engine designed for medium-duty trucks, buses, vocational vehicles, construction equipment, agricultural machinery, and industrial power units. As part of the ISC/ISL platform, the ISC-260 combines electronic management, high-pressure fuel delivery, durable cast-iron construction, and a robust air-handling system to meet demanding operational requirements.
With its 260-horsepower class rating, the
ISC-260 delivers strong torque, high reliability, and fuel-efficient
operation in mixed driving and heavy-duty work cycles. The engine is
engineered to comply with emissions standards of its production era,
integrating cooled EGR and refined combustion design. Known for its long
service life, broad parts availability, and superior performance under
load, the ISC-260 remains a popular powerplant across diverse
industries.
The ISC-260 is a four-stroke, inline six-cylinder diesel engine with a
displacement of approximately 8.3 liters (505 cubic inches). Bore
typically measures 114 mm (4.49 inches), and stroke measures about 135
mm (5.31 inches), forming a long-stroke design optimized for high torque
output. Compression ratio generally falls between 16.5:1 and 17.5:1
depending on emissions tier and configuration. The engine develops
approximately 194 kW (260 horsepower) at around 2200 rpm.
Peak torque typically ranges between 900 and
1100 Nm (664–811 lb-ft), usually reached at about 1300–1500 rpm. Idle
speed is normally around 750 ± 50 rpm. The firing order is 1–5–3–6–2–4.
Turbocharging and charge-air cooling enhance combustion stability,
responsiveness, and overall fuel efficiency. Electronic controls provide
precise management of injection timing, quantity, turbocharger
performance, emissions compliance, and engine protection strategies.
The cylinder block is cast from high-strength iron designed to withstand
high combustion pressures characteristic of advanced turbocharged diesel
operation. Reinforced structural ribs enhance rigidity and reduce
vibration. The forged-steel crankshaft is supported by seven main
bearings engineered for continuous heavy-duty operation and minimal
torsional deflection. Machined oil galleries and cast-in coolant jackets
provide uniform distribution of oil and coolant to all major components.
Piston cooling nozzles are integrated to
regulate crown temperatures under high load. Robust block architecture
supports installation in a variety of truck chassis, construction
machinery frames, and stationary industrial platforms. Threaded bosses
allow for flexible accessory mounting, including pumps, alternators,
PTOs, and hydraulic systems.
The cast-iron cylinder head incorporates direct-injection combustion
chambers optimized for high-pressure fuel injection and turbocharged
operation. The cylinder head is equipped with four valves per
cylinder–two intake and two exhaust–to support efficient airflow,
improved combustion, and reduced emissions. Valve actuation occurs
through rocker arms and pushrods linked to a camshaft located in the
block.
Hardened valve seats and high-temperature-resistant valve guides ensure durability under prolonged heavy-duty cycles. Some versions use hydraulic lash adjusters to minimize maintenance requirements. Advanced combustion chamber geometry enhances swirl and air–fuel mixing, supporting strong low-end torque and improved fuel economy. Integrated coolant passages stabilize head temperatures across all cylinders.
| Fuel System |
The ISC-260 employs a high-pressure CAPS (Cummins Accumulator Pump System) or high-pressure common-rail fuel system depending on production year. Both systems incorporate electronic injectors capable of precise fuel delivery and timing control. The high-pressure pump supplies fuel to a shared accumulator or rail, maintaining pressures commonly exceeding 1400–1600 bar (20,300–23,200 psi).
Electronically actuated injectors perform multiple injection events, including pilot and post-injection, to reduce noise, improve emissions, and enhance combustion stability. The electronic control module (ECM) monitors key parameters including rail pressure, crankshaft position, camshaft position, boost pressure, intake air temperature, coolant temperature, exhaust temperature, EGR flow, and fuel temperature. Fuel filtration includes primary and secondary filters with water separation.
| Lubrication System |
A gear-driven oil pump powers the lubrication system, drawing oil through a metal-mesh strainer and pushing it through a full-flow filter before distribution through the main gallery. Lubrication is delivered to crankshaft bearings, connecting rod journals, camshaft bearings, rocker arms, turbocharger bearings, and other moving components.
Piston cooling jets maintain thermal stability under heavy load. Normal operating oil pressure ranges from 300 to 500 kPa (44–72 psi). Idle pressure generally ranges from 100 to 150 kPa (15–22 psi). Oil capacity typically falls between 20 and 25 liters (21.1–26.4 US quarts), depending on sump configuration. Low-ash oil may be required for engines equipped with emissions aftertreatment.
| Cooling System |
The cooling system is a liquid-based, closed-loop circuit utilizing a belt-driven centrifugal water pump. Coolant circulates through cast-in block and head passages, removing heat and stabilizing engine temperature. The thermostat begins opening around 82°C (180°F) and is fully open near 95°C (203°F). System pressure usually ranges between 90 and 110 kPa (13–16 psi).
Coolant capacity generally falls between 25 and 35 liters (26.4–37.0 US quarts), depending on radiator and equipment configuration. The air-to-air charge-air cooler reduces intake temperature and increases air density, improving combustion efficiency and reducing thermal stress. Regular coolant-condition monitoring and radiator maintenance are essential to prevent overheating and corrosion.
| Other Systems |
Turbocharging increases intake air density, improving torque and response. Depending on configuration, the turbocharger may use wastegate or variable-geometry technology. Charge-air cooling lowers intake temperatures. The intake system includes a heavy-duty dry-element air filter, with optional dual-stage filtration for severe-duty environments. The exhaust system may incorporate components such as DOC, DPF, or SCR depending on application and emissions requirements.
Electrical systems are available in 12- or 24-volt configurations, with alternators rated between 60 and 120 amperes. ECM-controlled sensors continuously monitor engine operation, supporting diagnostics, derate functions, and protection strategies. PTO provisions, hydraulic pump adapters, and accessory mounts increase the engine’s application versatility.
| Dimensions and Weight |
Physical dimensions include:
Length: 1150–1350 mm (45.3–53.1 inches)
Width: 750–900 mm (29.5–35.4 inches)
Height: 1050–1350 mm (41.3–53.1 inches)
Dry weight typically ranges between 650 and 800 kg (1433–1764 lbs)
depending on configuration, turbocharger setup, and accessory package.
The engine’s modular, compact structure supports installation in
medium-duty trucks, buses, and construction equipment.
| Maintenance Data |
Oil and filter changes are recommended every 500 hours or 15,000–25,000 km (9,300–15,500 miles), depending on usage. Fuel filters should be replaced every 500 hours; water separators must be drained routinely. Air filter service intervals range from 250 to 500 hours depending on dust exposure. Coolant replacement generally occurs every two years or during major service events.
Valve lash inspection may be required on variants without hydraulic lash adjusters. Cleaning, regeneration, or periodic servicing of emissions components may be necessary depending on engine configuration. ECM data logs and fault codes support predictive maintenance, diagnostics, and repair planning.
| Tightening Torques |
Cylinder head bolts: 180–210 Nm (133–155 lb-ft)
Main bearing caps: 150–180 Nm (111–133 lb-ft)
Connecting rod bolts: 70–90 Nm (52–66 lb-ft)
Flywheel bolts: 220–260 Nm (162–192 lb-ft)
Crankshaft pulley bolt: 240–280 Nm (177–207 lb-ft)
Injector hold-down: 20–25 Nm (15–18 lb-ft)
Glow plugs / intake heaters (if equipped): 10–15 Nm (7–11 lb-ft)
Oil drain plug: 30–40 Nm (22–30 lb-ft).
| Vehicle Applications |
The Cummins ISC-260 powers medium-duty trucks, buses, vocational and municipal vehicles, wheel loaders, excavators, agricultural equipment, generator sets, industrial pumps, cranes, telehandlers, and specialized off-highway machinery. Its combination of emissions compliance, fuel efficiency, torque density, and long service life make it a versatile and reliable platform.
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