Cat 3406 DITA Specifications
| Engine Model: Caterpillar 3406 DITA |
| Engine Type: 4-cycle inline 6-cylinder turbocharged and aftercooled diesel |
| Total Displacement: 893 cu.in (14.6 L) |
| Rated Engine Power: 375-465 Hp (280-347 kW) at 2000 rpm |
| Fuel System Type: Electronic unit injector (EUI) |
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The Caterpillar 3406 DITA is an inline
six-cylinder, 14.6-liter heavy-duty diesel engine configured for Direct
Injection, Turbocharged, and Air-to-Air Aftercooled operation. This
engine represents a pinnacle of mechanical and thermodynamic efficiency
within the 3406 series, engineered for maximum power output and fuel
economy in continuous-duty industrial and marine applications.
The DITA configuration employs a precise direct injection fuel system
combined with advanced aspiration technology; the air-to-air aftercooler
provides a substantial reduction in intake air temperature, enabling a
greater mass of oxygen in the cylinders for more complete combustion.
Built upon the legendary 3406 platform, it retains the deep-skirt block,
cross-bolted main bearings, and wet cylinder liners synonymous with
Caterpillar durability. The 3406 DITA is designed for applications where
high power density, reliable operation under constant load, and long
service life are non-negotiable requirements.
Engine Type: Inline 6-Cylinder, Four-Stroke Cycle Diesel.
Aspiration: Turbocharged and Air-to-Air Aftercooled (ATAAC).
Displacement: 14.6 Liters (893 cubic inches).
Bore: 137 mm (5.4 inches).
Stroke: 165 mm (6.5 inches).
Engine Power (Industrial): 375-465 hp (280-347 kW) at 1800-2100 rpm.
Engine Power (Fire Pump): 292-482 hp (218-359 kW)
Engine Power (Truck): 365 hp (272 kW).
Compression Ratio: 14.5:1.
Firing Order: 1-5-3-6-2-4.
Rotation (Viewed from Flywheel End): Counterclockwise.
Governor Type: Electronic, managed by the Advanced Digital Electronic
Control (ADEC) system.
Emission Certification: Configurations exist meeting U.S. EPA Tier 1 and
early Tier 2 standards through electronic control and optimized
combustion.
The cylinder block is a massive, deep-skirt cast iron structure
engineered for maximum rigidity under continuous high load. It
incorporates replaceable wet-type cylinder liners. The liners are
pressed into the block and sealed at the top with a copper composition
gasket under a precision-machined flange. The lower end employs a
cross-bolted main bearing design.
Each of the seven nodular iron main bearing caps is secured by two
vertical bolts and two horizontal cross bolts that thread deep into the
block's lower skirt. This configuration creates an immensely stable
crankshaft environment, essential for managing the high cylinder
pressures generated by the DITA system. The camshaft is gear-driven and
rotates within bearings machined directly into the block.
A single cast iron cylinder head is used, secured by four bolts per
cylinder. The combustion chamber is a direct injection type. The head
employs a four-valve-per-cylinder design - two intake and two exhaust -
to facilitate the high volumetric airflow required for high-power,
aftercooled operation.
Valve seat inserts are hardened for extended durability under elevated
thermal loads. Valve guides are replaceable. The valve train uses
hydraulic lash adjusters, positioned in the cylinder head, which act on
roller-type rocker arms. This system eliminates the need for scheduled
manual valve lash adjustment. The cylinder head gasket is a multi-layer
steel (MLS) design.
The engine utilizes a direct injection, electronically controlled fuel
system. It is equipped with Caterpillar's Electronically Controlled Unit
Injector (EUI) system. Each cylinder has a self-contained unit injector
where the engine's camshaft provides the mechanical actuation force for
the injector plunger. The Advanced Digital Electronic Control (ADEC)
module precisely governs the timing and duration of fuel injection by
energizing the injector solenoid.
This system generates injection pressures exceeding 28,000 psi (1930
bar), ensuring fine atomization for efficient combustion with the dense,
aftercooled intake charge. A gear-type transfer pump supplies fuel
through primary and secondary filters.
Lubrication is provided by a high-capacity gear-type oil pump driven
from the front gear train. Oil is drawn from a deep, cast aluminum sump
through a pickup tube and screen. It is then forced through a full-flow,
spin-on oil filter. A bypass valve protects the system.
Filtered oil is directed through a large, integral plate-type oil cooler
before entering the main oil gallery. From the gallery, oil is
distributed to the crankshaft main and connecting rod bearings, camshaft
bearings, turbocharger, and valve train. Piston cooling jets spray a
continuous, high-volume stream of oil onto the underside of each piston,
a critical design for managing piston crown temperatures under sustained
high load.
Coolant circulation is managed by a gear-driven centrifugal water pump.
Coolant flows from the pump through passages in the cylinder block and
cylinder head. A wax-pellet thermostat regulates engine operating
temperature. The defining feature is the air-to-air aftercooler (ATAAC).
This is a separate, front-mounted heat exchanger that uses ambient air
to cool the turbocharged intake charge, significantly increasing its
density before it enters the cylinders. The engine cooling system itself
requires a radiator or heat exchanger of substantial capacity. A coolant
conditioner/filter is standard to maintain supplemental additive levels
and protect against liner cavitation and corrosion.
Starting System: 24-volt or 32-volt electric starting motor. Air
starting systems are a common and reliable option for industrial and
marine installations. Charging System: A heavy-duty brushless
alternator, with outputs from 130 to 200 amperes to support large
auxiliary loads in generator or marine applications.
Air Intake System: A dry-type, often two-stage cyclonic air cleaner
system with a service indicator. Air flows through the cleaner, into the
turbocharger compressor, through the air-to-air aftercooler core, and
into the intake manifold. Exhaust System: A divided-entry cast iron
exhaust manifold optimizes turbocharger response by pairing cylinders.
An electronically controlled wastegate regulates boost pressure.
Electronic Control: Governed by the Advanced Digital Electronic Control
(ADEC) module. This system provides precise fuel mapping for optimal
efficiency and power, along with comprehensive diagnostics and
protection features.
Dimensions are for a core industrial engine configuration. Approximate
length is 1660 mm (65.4 inches), width is 906 mm (35.7 inches), and
height is 1335 mm (52.6 inches). The air-to-air aftercooler and
associated piping add to the overall installation dimensions. The net
dry engine weight, excluding fluids but including standard accessories,
ranges from 1300 kg to 1350 kg (2866 lb to 2976 lb). The weight reflects
the engine's heavy-duty construction and the additional mass of the
aftercooling system.
Engine Oil Grade: Use engine oil meeting Caterpillar’s ECF-1-a
specification, equivalent to API CH-4 or CI-4. Oils meeting API CG-4 are
not approved for the EUI system. SAE 15W-40 is standard for general
operation.
Oil Change Interval: Dictated by service hours and load factor. In
continuous-duty generator or marine propulsion service, intervals of 500
hours are standard, with oil analysis used to confirm or extend the
interval. Severe cycling may require more frequent changes. Oil System
Capacity: Total refill capacity, including a filter change, is 41.6
Liters (11.0 US gallons).
Cooling System Capacity: Total cooling system capacity, including
radiator and aftercooler circuit, is approximately 75.7 Liters (20.0 US
gallons). Fuel Filter: Replace primary and secondary fuel filter
elements every 500 hours or as specified by the application's
maintenance schedule. Air Filter: Service or replace based on
restriction gauge indication. The high air flow and critical density of
the DITA system make filter integrity essential.
Valve Lash Adjustment: The hydraulic lash adjuster system requires no
scheduled mechanical adjustment. Engine Coolant: Use Caterpillar
Extended Life Coolant (ELC) or a conventional 50/50 ethylene glycol mix
with properly maintained Supplemental Coolant Additive (SCA) levels.
Preventing liner cavitation is absolutely critical.
Cylinder Head Bolts: Tighten in a specific three-step sequence. Final
torque: 300 Nm (221 lb-ft), followed by a 90-degree angular turn.
Main Bearing Cap Bolts (Vertical): 340 Nm (250 lb-ft) plus an additional
90-degree turn.
Main Bearing Cap Cross Bolts: 190 Nm (140 lb-ft).
Connecting Rod Cap Bolts: 190 Nm (140 lb-ft) plus an additional
90-degree turn.
Flywheel Housing-to-Block Bolts: 190 Nm (140 lb-ft).
Flywheel-to-Crankshaft Bolts: 285 Nm (210 lb-ft).
Unit Injector Clamp Bolt: 35 Nm (26 lb-ft).
Oil Pan Bolts: 55 Nm (41 lb-ft).
Oil Filter Cartridge: Hand-tighten until the gasket contacts the base,
then tighten an additional three-quarters turn.
The Cat 3406 DITA engine was specified for
the most demanding high-power, continuous-duty roles:
Power Generation: The prime mover for large base-load and
continuous-duty generator sets in the 400-900 kW range, used in data
centers, hospitals, and industrial plants. Marine Propulsion: A premier
choice for large commercial fishing vessels, offshore supply boats,
tugboats, and small ferries where high torque and reliable continuous
power are essential. Industrial: Powered large hydraulic power units,
high-pressure pumps for oilfield and mining, large industrial air
compressors, and locomotive engines.
Oil and Gas: The standard power source for the largest triplex and
quintuplex mud pumps, cement pumps, and frac pumps on well service rigs.
Mining: Used in large haul trucks, dredges, and dewatering pumps where
maximum power and uptime are critical. Pumping Stations: Employed in
large water irrigation, pipeline, and flood control applications.
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