Cummins QSZ13-G3 Specifications
| Engine Model: Cummins QSZ13-G3 |
| Engine Type: 4-stroke in-line 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 793 cu.in (13 L) |
| Rated Engine Power: 513-670 Hp (383-500 kW) at 1500-1800 rpm |
| Fuel System Type: Xtra-High Pressure Injection |
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The Cummins QSZ13-G3 represents a culmination
of heavy-duty engineering principles, positioned as a high-performance,
electronically managed diesel power unit within the 13-liter
displacement class. Designed to meet stringent emissions standards while
delivering robust power density, this engine is predominantly utilized
in critical standby, prime power, and continuous industrial
applications. Its architecture is defined by a robust in-line
six-cylinder configuration, incorporating advanced XPI high-pressure
common rail fuel systems and a single-series turbocharger with
air-to-air charge cooling.
The QSZ13-G3 is calibrated to deliver optimal performance at both 1500
RPM and 1800 RPM, making it suitable for global generator set
integration where reliability under variable load factors is paramount.
The engine’s design emphasizes a high-strength cylinder block and a
simplified service strategy, aligning with Cummins’ reputation for
durability in power generation and industrial sectors.
The Cummins QSZ13-G3 is a 4-cycle, in-line 6-cylinder diesel engine with
a displacement of 13.0 Liters (793 cu.in). The bore and stroke
dimensions are 130 mm (5.12 in) and 163 mm (6.42 in), respectively,
providing a favorable ratio for torque production. The engine employs
turbocharging and an air-to-air charge air cooling system to maximize
volumetric efficiency and combustion control. The compression ratio is
fixed at 17.0:1, balancing cold-start capability with peak cylinder
pressure management. The firing order is 1-5-3-6-2-4.
Power ratings are bifurcated by engine speed. At 1500 RPM (50 Hz), the
standby power rating is 470 kW (629 HP), prime power is 450 kW (603 HP),
and continuous power is 383 kW (513 HP). At 1800 RPM (60 Hz), the
standby power rating is 500 kW (670 HP) with a prime power rating of 450
kW (603 HP). Peak torque output reaches 2,865 Nm (2,113 lb-ft) at 1500
RPM, underscoring the engine’s capability to accept substantial load
steps in generator set applications.
The cylinder block is a deep-skirt, gray cast iron construction,
engineered to provide a rigid foundation for the crankshaft and to
minimize bore distortion under high cylinder pressures. The design
incorporates a one-piece block with siamesed cylinder bores to enhance
structural integrity and reduce the overall block length. The deep-skirt
configuration extends the block below the crankshaft centerline,
allowing for increased stiffness and superior vibration damping.
Reinforced bulkheads with six head bolts per cylinder ensure uniform
clamping force distribution, maintaining the cylinder head-to-block seal
under the elevated thermal and mechanical loads characteristic of the
high-pressure common rail combustion process. The block is equipped with
replaceable wet-type cylinder liners, facilitating serviceability
without requiring complete engine removal for overhaul in many
applications.
The cylinder head is manufactured from high-strength alloy cast iron,
featuring a cross-flow design that optimizes air movement through the
valves. Each cylinder is serviced by four valves - two intake and two
exhaust - arranged to maximize the swirl and flow coefficients required
for efficient mixing with fuel from the centrally located injector. The
valve train utilizes overhead camshaft architecture, driven by a gear
train at the rear of the engine, ensuring precise timing control and
reduced valve train deflection at high engine speeds.
Valve bridges are employed to actuate the paired valves simultaneously,
distributing load evenly across the valve stems. Induction-hardened
valve seats and chrome-plated valve stems provide resistance against
wear and corrosion in high-temperature operating environments. The
cylinder head gasket is a multi-layer steel (MLS) design, selected for
its resilience to the thermal cycling common in standby power
applications.
The fuel system is predicated on the XPI (Xtra-High Pressure Injection)
High Pressure Common Rail (HPCR) architecture. This system decouples
pressure generation from the injection event, enabling precise control
over injection timing, duration, and pressure across the entire
operating range. A high-pressure fuel pump, driven by the gear train,
supplies fuel to a common rail accumulator at pressures reaching up to
2,000 bar (29,000 psi).
The electronic control module (ECM) governs the system, commanding
piezoelectric or solenoid injectors to deliver multiple injection events
per cycle - including pilot, main, and post injections - to optimize
combustion noise, emissions, and fuel consumption. The governor is fully
electronic, providing an isochronous regulation capability of 1% for
precise frequency control in generator set applications.
The lubrication system is a forced-feed, full-flow filtration design
utilizing a gear-type positive displacement pump. Total system capacity
is 45.42 Liters (12 U.S. Gal). The system is configured to maintain oil
pressure within a range of 207 kPa to 355 kPa (30-51 PSI) under warm
operating conditions. A spin-on full-flow oil filter is complemented by
a bypass filtration circuit to extend oil service intervals and remove
fine particulate matter.
The oil cooler is an integrated plate-and-fin type, utilizing engine
coolant as the heat exchange medium to stabilize oil temperature. A
deep-sump oil pan is standard, incorporating baffles to ensure
consistent oil pickup during static operation or minor angular
displacement typical in stationary installations.
Engine-only coolant capacity is 23.1 Liters (6.1 U.S. Gal). The cooling
system operates under a pressurized, closed-loop configuration designed
to maintain optimal thermal efficiency. The thermostat initiates opening
at 82°C (180°F) and achieves full open by 94°C (201°F). The maximum
allowable coolant temperature at the cylinder head outlet is 102°C
(216°F).
The system employs a centrifugal water pump directly driven by the gear
train, ensuring consistent flow rates across the speed range. For
generator set installations, the engine is typically paired with a
separate radiator package incorporating an air-to-air charge air cooler,
though the engine block is configured with the necessary ports for keel
cooling or remote radiator applications.
The electrical system operates on a 24-volt negative ground
architecture. Battery requirements mandate a minimum cold cranking
ampere (CCA) rating of 900. The starting system consists of a 24-volt
starter motor with an integral solenoid. The electronic control module
(ECM) manages all engine functions, including fueling, governor
response, and diagnostic monitoring via a CAN (Controller Area Network)
interface compliant with J1939 protocol.
The air intake system incorporates a heavy-duty, replaceable-element air
cleaner with a restriction indicator to monitor filter loading. The
exhaust system features a water-cooled turbocharger housing in certain
configurations to reduce surface temperatures in enclosed environments.
Engine protection systems are integrated, providing automatic shutdown
or derate for parameters including low oil pressure, high coolant
temperature, and overspeed.
0Dry engine weight ranges from 1,195 kg to 1,245 kg (2,635-2,745 lbs),
depending on the specific flywheel housing and alternator adapter
configuration. Wet weight, inclusive of all fluids (lubricating oil,
fuel, and coolant), ranges from 1,260 kg to 1,310 kg (2,778-2,888 lbs).
Approximate physical dimensions for the base engine are 2,180 mm (85.8
in) in length, 1,360 mm (53.5 in) in width, and 1,605 mm (63.2 in) in
height.
Service intervals are predicated on operational duty cycle, with
standard prime power applications specifying oil and filter changes at
500 hours of operation. Coolant replacement intervals follow a
2,000-hour or 24-month schedule, utilizing a fully formulated ethylene
glycol-based coolant with supplemental coolant additive (SCA)
management. Valve lash inspection is recommended at 1,500-hour
intervals; the cold setting for intake valves is 0.36 mm (0.014 in) and
for exhaust valves is 0.69 mm (0.027 in).
Fuel filter replacement is specified at 500-hour intervals, utilizing a
2-micron absolute efficiency element. The air cleaner element requires
service when the restriction indicator reaches 6.2 kPa. Crankshaft end
play is controlled within a range of 0.13 mm to 0.41 mm (0.005-0.016
in). Belt tension for the accessory drive is maintained via an automatic
tensioner, requiring no manual adjustment.
Cylinder head bolts are tightened in a multi-stage angular process: an
initial torque of 150 Nm (111 lb-ft), followed by a 90-degree rotation,
and a final 90-degree rotation. Connecting rod cap bolts receive a
torque of 110 Nm (81 lb-ft) plus an additional 60-degree rotation. Main
bearing cap bolts are torqued to 250 Nm (184 lb-ft) plus a 90-degree
rotation for the main bolts, with side bolts torqued to 150 Nm (111
lb-ft).
The flywheel housing mounting bolts are torqued to 150 Nm (111 lb-ft).
Flywheel bolts require a torque of 350 Nm (258 lb-ft) plus a 60-degree
rotation. Rocker arm pedestal bolts are set to 120 Nm (89 lb-ft).
Injector clamp bolts are torqued to 30 Nm (22 lb-ft). The vibration
damper mounting bolts are torqued to 120 Nm (89 lb-ft) plus a 90-degree
rotation.
The primary application for the Cummins QSZ13-G3 is within stationary
power generation, including standby generator sets for commercial
buildings, data centers, healthcare facilities, and telecommunications
infrastructure. It is also utilized in prime power configurations for
remote mining operations, oil and gas field installations, and
industrial cogeneration plants.
Beyond generator sets, the engine finds application in driven equipment
such as irrigation pumps, large-capacity compressors, and industrial
hydraulic power units where a reliable, electronically governed prime
mover with a high power-to-weight ratio is required. The engine’s rating
structure makes it suitable for both 50 Hz and 60 Hz markets, ensuring
compatibility with global power generation equipment manufacturers.
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