Cat 3606 Specifications
| Engine Model: Caterpillar 3606 |
| Engine Type: 4-stroke inline 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 6,764 cu.in (110.8 L) |
| Rated Engine Power: 2000-2480 Hp (1490-1850 kW) at 1000 rpm |
| Fuel System Type: Unit Injector |
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The Caterpillar 3606 engine is a member of the
renowned Caterpillar 3600 Series, a family of large-bore, high-speed
diesel power units engineered for continuous duty in the most demanding
industrial, marine, and electric power generation applications. This
engine is distinguished by its robust in-line six-cylinder
configuration, designed for exceptional durability, long service
intervals, and high reliability under sustained heavy loads. The 3606
operates on a 4-stroke-cycle diesel principle, incorporating advanced
turbocharging and jacket water aftercooling to achieve high power
density while maintaining thermal efficiency and emissions compliance.
Its design philosophy prioritizes ease of maintenance, with features
such as individual cylinder heads, a segmented camshaft, and a fully
electronic fuel system management platform that allows for precise
control over power delivery and fuel economy. The engine is a
cornerstone for operations requiring prime or standby power, marine
propulsion, and heavy industrial machinery, offering a balance of high
output, structural integrity, and operational economy.
The Caterpillar 3606 is a heavy-duty engine built to operate over a
narrow, high-torque speed range, making it ideal for generator drive and
propulsion applications. The engine’s foundational architecture is based
on a large displacement that provides substantial torque rise.
Engine Configuration: Inline 6, 4-stroke-cycle diesel
Bore: 280 mm (11.0 in)
Stroke: 300 mm (11.8 in)
Displacement: 110.8 L (6,764 cu.in)
Compression Ratio: 13:1
Aspiration: Turbocharged and Jacket Water Aftercooled
Rotation: Counterclockwise (from flywheel end)
Dry Weight: 15,680 kg (34,500 lb)
Maximum Power: 1,850 kW (2,480 hp) @ 750-1000 RPM
Minimum Power: 1,490 kW (2,000 hp) @ 750-1000 RPM
Maximum Torque: 18,200 Nm (13,424 lb-ft) @ 820 RPM
The cylinder block is a rigid, cast-iron structure designed to withstand
the extreme combustion pressures generated by the engine’s high
compression ratio and turbocharged operation. It features a deep-skirt
design that provides exceptional support for the crankshaft main
bearings, minimizing vibration and flex under load. The block
incorporates wet-type cylinder liners, which are replaceable and allow
for efficient heat transfer directly to the surrounding coolant.
These liners are induction-hardened to provide a long-wearing surface
for the piston rings. The block casting integrates large passages for
the cooling and lubrication circuits, ensuring uniform temperature
distribution around each cylinder. The design also includes access
covers for inspection and maintenance of internal components without
extensive disassembly.
The engine utilizes individual cylinder heads for each cylinder, a
design choice that simplifies maintenance and repair compared to a
single multi-cylinder head. Each head is constructed from high-strength
cast iron and is secured to the block using multiple high-tension
fasteners. This configuration provides a superior clamping force for the
cylinder liner seal and gasket interface.
The valve train is an overhead arrangement, actuated by a camshaft
located in the cylinder block. Pushrods and rocker arms transfer motion
to the valves. Each cylinder head houses four valves: two intake and two
exhaust. The valves are constructed from high-temperature alloys to
resist corrosion and wear under continuous high-load operation. The
valve seats are replaceable inserts made from hardened steel, allowing
for reconditioning of the cylinder head during overhaul. The exhaust
valves are sodium-cooled to dissipate heat effectively, extending valve
life in the high-thermal-stress environment of a turbocharged diesel
engine.
The fuel system is a high-pressure, unit injection design optimized for
precise fuel delivery and combustion efficiency across varying operating
cycles. Each cylinder is served by its own mechanical unit injector,
actuated by the engine’s camshaft. This system eliminates high-pressure
external fuel lines, reducing the risk of leakage and fire hazards.
The system is controlled by an electronic control module that governs
injection timing and duration based on engine speed, load, and
atmospheric conditions. This electronic management ensures optimized
fuel consumption, reduced emissions, and stable performance under
transient load conditions. The fuel system is supported by a primary
fuel filter/water separator and a secondary fuel filter to ensure
contaminant-free fuel delivery to the precision injectors.
The lubrication system is a high-capacity, full-flow filtration system
designed to maintain a clean and stable oil supply under all operating
conditions. It features a gear-driven, positive-displacement oil pump
mounted on the front of the engine. The system includes a top-mounted
crankcase breather that effectively separates oil mist from blow-by
gases, reducing oil consumption and crankcase pressure.
A large, tube-type oil cooler maintains the engine oil at an optimal
temperature by transferring heat to the jacket water system. The system
utilizes cartridge-type oil filters with replaceable elements, located
for convenient right-hand service access. A shallow oil pan is standard,
designed to maintain a low sump oil temperature and provide adequate oil
supply during operation on inclines. The lubrication circuit provides
pressurized oil to the crankshaft, camshaft, connecting rods,
turbocharger, and other critical components.
The cooling system is a pressurized, jacket-water design that circulates
coolant through the cylinder block, cylinder heads, and turbocharger
aftercooler. A centrifugal water pump, driven by the engine’s gear
train, ensures high-volume coolant flow. The system is divided into two
circuits: a low-temperature circuit dedicated to the jacket water
aftercooler to cool the intake air, and a high-temperature circuit for
the engine block and heads.
The aftercooler system uses jacket water to reduce the temperature of
compressed intake air, increasing air density for improved combustion
efficiency and power output. The cooling system is designed to maintain
consistent operating temperatures, critical for component longevity and
emissions control. Thermostats regulate coolant flow to maintain rapid
warm-up and stable operating temperature under varying ambient
conditions.
Air Intake System: The air intake system features a heavy-duty air
cleaner with a restriction indicator, followed by the turbocharger. The
turbocharger compresses incoming air, which is then cooled by the jacket
water aftercooler before entering the cylinder heads. This system
maximizes volumetric efficiency and combustion quality.
Governor and Control System: The engine is equipped with a 3161 RH
governor that incorporates a self-contained synthetic oil sump and an
air-fuel ratio control mechanism. This governor provides precise speed
regulation, essential for generator set applications requiring
isochronous operation or for marine applications needing reliable
propulsion control.
Instrumentation and Safety System: A right-hand instrument panel
provides gauges for oil pressure, fuel pressure, jacket water
temperature, and a tachometer. An integrated protection system includes
manual and safety shutoffs that automatically halt the engine in the
event of low oil pressure, high water temperature, or overspeed,
preventing catastrophic damage.
Starting System: The engine is configured for electric starting with
multiple high-torque starters, or for air starting systems depending on
the application requirements. The starting system is designed for rapid
engine cranking to ensure reliable ignition in cold or adverse
conditions.
Length: 3,988 mm (157 in)
Width: 1,748 mm (69 in)
Height: 2,626 mm (103 in)
Dry Weight: 15,680 kg (34,500 lb)
Oil Change Interval: 500 hours under standard duty, using Caterpillar’s
specified engine oils.
Oil Filter Change: Performed concurrently with oil change;
cartridge-type filters.
Fuel Filter Change: Primary and secondary filters changed every 500
hours or as indicated by restriction gauges.
Valve Lash Adjustment: Intake and exhaust valves require inspection and
adjustment every 1,500 hours.
Air Cleaner Service: Filter elements serviced when the restriction
indicator signals; heavy-duty paper elements.
Cooling System Service: Coolant analysis and supplemental coolant
additive (SCA) maintenance performed at 500-hour intervals, with full
system flush and coolant replacement at longer intervals based on fluid
analysis.
Overhaul Intervals: Major overhaul intervals are typically scheduled
between 15,000 and 20,000 hours for continuous-duty applications,
depending on load factors and maintenance quality.
Cylinder Head Bolts: Initial torque to 650 Nm (479 lb-ft).
Connecting Rod Cap Bolts: Torque to 475 Nm (350 lb-ft).
Main Bearing Cap Bolts: Torque to 1,800 Nm (1,327 lb-ft).
Flywheel Mounting Bolts: Torque to 420 Nm (310 lb-ft).
Camshaft Bearing Cap Bolts: Torque to 270 Nm (199 lb-ft).
Injector Hold-Down Bolts: Torque to 105 Nm (77 lb-ft).
Rocker Arm Shaft Support Bolts: Torque to 260 Nm (192 lb-ft).
The Caterpillar 3606 engine is utilized in a variety of heavy-duty
applications that demand continuous high power and reliability.
Marine Propulsion: The engine serves as a prime mover for tugboats,
pushboats, ferries, coastal freighters, and fishing vessels. Its high
torque output at low RPM provides excellent propeller efficiency and
maneuverability.
Marine Auxiliary: As a generator set engine, the 3606 provides shipboard
electrical power for lighting, navigation, cargo handling, and hotel
loads.
Electric Power Generation: The engine is widely used in prime power
applications for remote mining sites, industrial facilities, and large
data centers. It is also deployed in standby power installations where
rapid response and reliability are critical.
Industrial Applications: The engine powers large hydraulic excavators,
drilling rigs, and heavy pumping systems used in the oil and gas,
mining, and water management sectors. Its robust construction and
ability to operate at sustained high loads make it suitable for
stationary industrial machinery.
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