Cummins ISB6.7E6 Specifications
| Engine Model: Cummins ISB6.7E6 |
| Engine Type: 4-cycle inline 6-cylinder direct injection liquid-cooled diesel |
| Total Displacement: 408 cu.in (6.7 L) |
| Rated Engine Power: 150-325 Hp (112-242 kW) at 2500 rpm |
| Aspiration Type: Turbocharged |
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The Cummins ISB6.7E6 is a modern,
electronically controlled 6.7-liter inline six-cylinder diesel engine
that represents one of the most advanced and refined versions of the
Cummins B-Series platform. Designed for Euro-6 emissions compliance
(E6), the ISB6.7E6 incorporates sophisticated high-pressure common-rail
fuel-injection, cooled EGR, advanced turbocharging, a diesel oxidation
catalyst (DOC), diesel particulate filter (DPF), selective catalytic
reduction (SCR), and full onboard diagnostics (OBD). Despite the
complexity of the emissions system, the ISB6.7E6 maintains Cummins’
hallmark reliability, long service life, strong low-speed torque, and
excellent fuel economy.
Used extensively in medium-duty trucks, buses, municipal vehicles,
agricultural tractors, construction equipment, and specialized
commercial applications, the ISB6.7E6 delivers a balance of durability,
clean combustion, high performance, and reduced noise. The engine’s
electronic control module (ECM) manages fueling, injection timing,
emissions after-treatment, boost pressure, and diagnostics, allowing the
engine to meet stringent environmental standards while maintaining high
productivity.
The ISB6.7E6 is a four-stroke, water-cooled, turbocharged inline
six-cylinder diesel engine. Displacement is 6.7 liters (408 cubic
inches). Bore is 107 mm (4.21 in) and stroke is 124 mm (4.88 in),
creating a long-stroke design optimized for torque and fuel efficiency.
Compression ratio varies from 16.5:1 to 17.3:1 depending on emissions
configuration and calibration.
Power ratings (Euro-6 truck and bus
applications):
– 150–325 hp (112–242 kW) @ 2,000–2,600 rpm
– Common ratings: 210, 240, 260, 280, 300, 325 hp
Peak torque outputs: 700–1,200 Nm (516–885 lb-ft) @ 1,100–1,600 rpm
Idle speed: 650–750 rpm
Governed speed: typically 2,600–2,900 rpm
Firing order: 1-5-3-6-2-4
The crankshaft is forged steel with seven main bearings for exceptional
durability. Pistons are aluminum alloy with reinforced crowns and
internal oil-cooling galleries. Connecting rods are forged steel with
replaceable bearings. The camshaft is gear-driven for long-term timing
stability.
The high-strength cast-iron block includes:
– Parent-bore cylinders
– Deep skirt for rigidity
– Full water-jacket cooling
– Structural ribs to reduce noise and vibration
– Oversized main-bearing saddles
This structure supports long life under continuous high load and
high-temperature operation.
The cylinder head is cast iron with:
– Four valves per cylinder (16-valve head)
– Central injector placement
– Optimized airflow for reduced emissions
– Hardened valve seats and guides
– Roller tappets and pushrods actuated by the ECM-controlled camshaft
profile
Cold valve-lash settings:
– Intake: 0.254 mm (0.010 in)
– Exhaust: 0.508 mm (0.020 in).
The ISB6.7E6 uses a high-pressure common-rail system controlled by the
engine ECM.
Key components include:
– High-pressure fuel pump (up to 1,800–2,000 bar / 26,000–29,000 psi)
– Electronically controlled solenoid injectors
– Electric lift pump
– Fuel-temperature and rail-pressure sensors
– Dual-stage filtration
– Water separator
The ECM manages multi-event injection,
providing:
– Pre-injection for quiet operation
– Main injection for power
– Post-injection for emissions and DPF regeneration
Regular maintenance:
– Fuel filters: every 250–500 hr
– Water separator drained daily
– Injector testing every 1,500–2,000 hr
– ECM diagnostics for irregular performance.
The engine uses a full-pressure wet-sump lubrication system driven by a
gear pump.
Oil capacity: 15–20 liters (15.8–21.1 qt)
Oil pressure:
– 275–450 kPa (40–65 psi) operating
– 70–100 kPa (10–15 psi) idle
Recommended lubricants:
– SAE 10W-30 or 15W-40
– oil meeting API CJ-4, CK-4, or ACEA E9
Oil-change intervals vary:
– Industrial: 250–500 hr
– On-road (Euro-6): up to 40,000–60,000 km depending on duty cycle.
The cooling system includes:
– Belt-driven centrifugal water pump
– Thermostat-controlled coolant circulation
– Radiator or remote cooling systems
– ECM-controlled fan drive on many models
Thermostat settings:
– Begins opening: 82°C (180°F)
– Fully open: 95°C (203°F)
Cooling-system capacity: 22–28 liters (23–30 qt)
System pressure: 70–100 kPa (10–15 psi).
| Intake and Exhaust Systems |
Air intake:
– Turbocharged with wastegate or VGT depending on calibration
– Charge-air cooling (ATAAC) standard
– Heavy-duty air cleaner options
Turbocharging:
– Variable Geometry Turbocharger (VGT) on most E6 models
– Provides rapid boost response
– Enhances low-RPM torque
– Supports exhaust after-treatment regeneration
Exhaust system includes:
– Diesel oxidation catalyst (DOC)
– Diesel particulate filter (DPF)
– Selective catalytic reduction (SCR) with DEF injection
– DEF dosing module and sensors
– NOx and temperature sensors.
| Electrical and Electronic Systems |
The ISB6.7E6 features an advanced ECM
controlling:
– Injection timing and pressure
– Turbocharger vane position (VGT)
– EGR valve
– DPF regeneration cycles
– SCR dosing
– Idle control
– Fault diagnostics
Standard sensors:
– Crankshaft and camshaft position
– MAP/boost
– Exhaust temperature (multiple locations)
– NOx sensors
– Lambda sensor (certain calibrations)
– Oil pressure
– Coolant temperature
– Ambient temperature and pressure
– DEF level and temperature
12V or 24V starting systems are used depending on application.
Optional equipment includes:
– Hydraulic pump mounts
– PTO drives
– Belt-driven compressors
– Remote radiator connections
– Fan drives (viscous, electric, or ECM-controlled hydraulic).
Approximate dimensions:
– Length: 1,050–1,150 mm (41–45 in)
– Width: 700–850 mm (28–33 in)
– Height: 1,000–1,150 mm (39–45 in)
Dry weight: 450–520 kg (992–1,146 lb).
Routine service:
– Oil and filter every 250–500 hr
– Fuel filters: 250–500 hr
– Air filter: inspect every 50–100 hr
– Valve lash: every 1,000 hr
– Injector service: 1,500–2,000 hr
– Coolant replacement: every 2 years
– DPF cleaning interval: 150,000–300,000 km
– SCR/DEF system inspection: each service.
– Cylinder-head bolts: 190–210 Nm (140–155 lb-ft) + 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).
The Cummins ISB6.7E6 is used in:
– Medium-duty trucks (DAF, MAN, Iveco, Volvo, Freightliner, etc.)
– City and intercity buses
– Agricultural tractors
– Municipal vehicles
– Construction machinery
– Light-duty mining equipment
– Fire trucks and emergency vehicles.
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