Cummins QSB5.9 Specifications
| Engine Model: Cummins QSB5.9 |
| Engine Type: 4-cycle inline 6-cylinder HPCR direct injection liquid-cooled diesel |
| Total Displacement: 359 cu.in (5.9 L) |
| Rated Engine Power: 100-220 Hp (74-164 kW) at 2400 rpm |
| Aspiration Type: Turbocharged |
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The Cummins QSB5.9 is a modern, electronically
controlled evolution of the legendary 6BT5.9 engine. It incorporates
high-pressure common-rail (HPCR) fuel-injection technology, an advanced
ECU, improved emissions performance, and more refined operating
characteristics while retaining the mechanical robustness and
long-service-life characteristics of the original B-Series platform.
The QSB5.9 is widely used in agricultural machinery, medium-duty trucks,
loaders, backhoe loaders, excavators, telehandlers, industrial power
units, and generator sets. It offers excellent cold-start performance,
reduced emissions, improved combustion stability, and extended
maintenance intervals.
The Cummins QSB5.9 is a four-stroke, water-cooled, turbocharged inline
six-cylinder diesel engine. Displacement is 5.9 liters (359 cubic
inches). Bore is 102 mm (4.02 in), stroke is 120 mm (4.72 in), producing
a long-stroke design optimized for torque. Compression ratio ranges from
16.5:1 to 17.5:1 depending on calibration and emissions rating.
Power ratings (varies by application):
– Agricultural and construction equipment: 130–220 hp (97–164 kW) @
2,200–2,600 rpm
– Industrial/machinery versions: 100–200 hp (74–149 kW)
– Generator-drive versions (QSB5.9-G): 100–150 kW @ 1,500–1,800 rpm
Peak torque: 500–750 Nm (369–553 lb-ft) @ 1,400–1,800 rpm
Idle speed: 700–800 rpm
Governed speed: 2,400–2,700 rpm
Firing order: 1-5-3-6-2-4.
The crankshaft is forged steel with seven main bearings. Pistons are
cast aluminum alloy with reinforced combustion bowls and oil galleries.
Connecting rods are forged steel. The camshaft is gear-driven for
long-term timing accuracy.
The QSB5.9 block is high-strength cast iron
and includes:
– Parent-bore cylinders
– Deep-skirt design
– Structural reinforcement ribs
– Full water-jacket cooling
– Wide main-bearing saddles
The block is engineered for durability under high load and supports
multiple re-boring operations.
The cast-iron cylinder head features:
– Four valves per cylinder (24-valve configuration)
– Central injector location
– Hardened valve seats and guides
– High-efficiency intake and exhaust ports
– Roller tappets and pushrods
Cold valve-lash settings:
– Intake: 0.254 mm (0.010 in)
– Exhaust: 0.508 mm (0.020 in).
The QSB5.9 uses a high-pressure common-rail (HPCR) fuel-injection system
controlled by an advanced ECU. This system delivers precise fuel
metering, improved emissions control, reduced combustion noise, and
better fuel economy.
Fuel-system components include:
– High-pressure fuel pump (up to 1,600–1,800 bar / 23,000–26,000 psi)
– Electronically actuated injectors
– Electric lift pump
– Rail-pressure sensor
– Fuel-temperature and supply-pressure sensors
– Dual-stage fuel filtration with water separator
Injection strategy:
– Pilot injection for noise reduction
– Main injection for power
– Post-injection for emissions control
Fuel-system maintenance:
– Fuel filters: 250–500 hr
– Water separator: daily
– Injector service: 1,200–1,800 hr
– HPCR pump inspection: major overhaul interval.
A full-pressure lubrication system is used.
Oil capacity: 13–15 liters (13.7–15.8 qt)
Operating oil pressure: 275–380 kPa (40–55 psi)
Idle pressure: 70–100 kPa (10–15 psi)
Recommended oil:
– SAE 10W-30 or 15W-40
– API CI-4, CJ-4, or CK-4
Oil-change intervals:
– Industrial: 250–500 hr
– On-highway: up to 20,000–30,000 km.
Cooling features:
– Belt-driven centrifugal water pump
– Thermostat-regulated coolant flow
– Integrated oil cooler
– Radiator or remote cooling
– Air-to-air charge-air cooler (ATAAC) on many versions
Thermostat:
– Opening: 82°C (180°F)
– Fully open: 95°C (203°F)
Cooling capacity: 20–25 liters (21–26 qt)
System pressure: 70–100 kPa (10–15 psi).
| Intake and Exhaust Systems |
Intake:
– Dry-type filter
– Optional dual-stage filtration
– Cyclone pre-cleaner for dusty environments
Turbocharging:
– Fixed-geometry turbocharger
– Optional wastegate control
– Oil-lubricated center housing
Aftercooling:
– Air-to-air charge-air cooler standard on industrial/agricultural
variants
Exhaust:
– Cast-iron manifold
– High-capacity turbine housing
– Optional EGR, DOC, DPF depending on emission tier.
| Electrical and Electronic Systems |
The QSB5.9 uses a fully integrated ECU to
manage:
– Injection timing and pressure
– Turbocharger/boost logic (wastegate control)
– Rail-pressure regulation
– Idle speed control
– Intake air and coolant temperature monitoring
– Diagnostic fault-code storage
Electronic sensors include:
– Crankshaft and camshaft position sensors
– MAP/boost pressure sensor
– Oil-pressure and oil-temperature sensors
– Coolant-temperature sensor
– Fuel-temperature and rail-pressure sensors
– EGR and turbo sensors (if equipped)
Alternator output: 60–120 amps depending on application.
Available factory and OEM options include:
– PTO drive pads
– Hydraulic pump mounts
– Remote radiator plumbing
– Belt-drive accessory systems
– Air-conditioning compressor mounts
– Industrial flywheel housings.
Approximate dimensions:
– Length: 1,050–1,150 mm (41–45 in)
– Width: 700–850 mm (28–33 in)
– Height: 950–1,050 mm (37–41 in)
Dry weight: 430–520 kg (948–1,146 lb).
Routine maintenance:
– Oil and filter: 250–500 hr
– Fuel filters: 250–500 hr
– Air filter: inspect 50–100 hr
– Valve lash: 1,000 hr
– Injector timing/diagnostic checks: 1,200–2,000 hr
– Coolant replacement: every 2 years
– Belt inspection: every service
– Compression testing: 2,000 hr.
– Cylinder-head bolts: 190–210 Nm (140–155 lb-ft) + angle
– 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: 40–55 Nm (30–41 lb-ft)
– Injector hold-down: 25–30 Nm (18–22 lb-ft).
The Cummins QSB5.9 is widely used in:
– Agricultural tractors and sprayers
– Wheel loaders and excavators
– Telescopic handlers
– Backhoe loaders
– Forklifts and material handlers
– Generator sets (100–150 kW)
– Industrial pumps and compressors
– Municipal vehicles
– Medium-duty trucks (market dependent).
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