Cat 3516B Specifications
| Engine Model: Caterpillar 3516B |
| Engine Type: 4-stroke 16-cylinder V-block turbocharged liquid-cooled diesel |
| Total Displacement: 4,210 cu.in (69.1 L) |
| Rated Engine Power: 2145-3000 Hp (1600-2250 kW) at 1600 rpm |
| Fuel System Type: Electronic Unit Injector |
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The Caterpillar 3516B is a high-performance,
16-cylinder diesel engine renowned for its exceptional durability, power
density, and operational versatility across the most demanding
industrial sectors. As a member of Caterpillar’s 3500 series, this
engine is built upon a robust V-16 architecture designed to withstand
sustained high loads with minimal wear. Its hallmark is the integration
of the Electronic Unit Injection (EUI) fuel system managed by the ADEM
II controller, which delivers precise fuel control, optimizing power
output while maintaining compliance with global emission standards.
The engine’s design prioritizes serviceability; individual cylinder
heads and large access covers facilitate in-frame overhauls,
significantly reducing downtime and lifecycle costs. Whether powering an
ultra-class mining haul truck, serving as the prime mover for a marine
vessel, or providing critical standby power for a data center, the 3516B
is recognized for its uncompromising reliability and high torque rise,
making it a benchmark in its power class.
The Caterpillar 3516B operates as a four-stroke-cycle diesel engine. Its
configuration is a 60-degree V-16, a layout chosen to balance smooth
operation with compact dimensions relative to its displacement. The
engine’s total displacement is 69 Liters (4,210 cu.in), achieved through
a bore of 170 mm (6.7 in) and a stroke of 190 mm (7.5 in). This
long-stroke design contributes to the engine’s high torque
characteristics.
For aspiration, the 3516B utilizes a turbocharged and aftercooled
system. Two primary aftercooling configurations are available: separate
circuit aftercooling (SCAC), which uses a dedicated seawater or
freshwater circuit for maximum charge air cooling, and jacket water
aftercooling (JWAC), which uses the engine’s own coolant system for
simplicity. The compression ratio is selected based on the specific
emission tier and application, with common ratios being 14.0:1 for
higher-output, lower-emission configurations and 15.5:1 for versions
optimized for rugged durability and lower-speed operation.
Engine rotation is standard as counterclockwise when viewed from the
flywheel end. The dry weight of the core engine is substantial, ranging
from 7,484 kg (16,500 lbs) to 8,070 kg (17,800 lbs), reflecting the
heavy-duty construction of its internal components and block.
Prime Power (60 Hz, 1800 RPM): 1640 kW to 2000 kW (2200 to 2680 hp)
Standby Rating (60 Hz, 1800 RPM): Up to 2250 kW (3000 hp)
Prime Power (50 Hz, 1500 RPM): 1600 kW (2145 hp)
Standby Rating (50 Hz, 1500 RPM): Up to 2000 to 2500 kVA (1600 to 2000
ekW)
Rated Output (Marine): 1717 kW (2315 hp) at 1600 RPM
The cylinder block of the 3516B is a deep-skirted, one-piece cast iron
design. The deep-skirt configuration extends the side walls below the
crankshaft centerline, providing exceptional rigidity and support for
the main bearing caps. This design minimizes crankshaft flex and bore
distortion under high cylinder pressures, which is critical for
long-term durability in continuous-duty applications.
The block incorporates large, removable access plates on the sides,
allowing for inspection and service of connecting rods and main bearings
without removing the engine from its frame. The wet-type cylinder liners
are induction hardened and replaceable, promoting a long service life
and simplified overhaul procedures.
Instead of a single bank head, the 3516B utilizes individual cylinder
heads for each cylinder. This modular approach offers significant
service advantages, allowing a single cylinder to be serviced without
disturbing the others, reducing the scope of repair. Each cylinder head
is constructed from high-strength cast iron and houses four valves - two
intake and two exhaust - which optimize airflow for efficient combustion
and power.
The four-valve arrangement also provides improved thermal distribution
across the head. The valvetrain is actuated by a single camshaft per
cylinder bank, with pushrods and rocker arms transferring motion to the
valves. The exhaust valves are equipped with Caterpillar’s proprietary
induction-hardened seats to withstand the high thermal loads associated
with continuous operation at peak power.
The fuel system is the Caterpillar Electronic Unit Injection (EUI)
system, a hallmark of this engine generation. In this system, the fuel
injection pump and the nozzle are combined into a single unit located at
each cylinder. The EUI system operates independently of engine speed to
generate high injection pressures, ensuring complete atomization of the
fuel for efficient combustion.
The ADEM II (Advanced Diesel Engine Management) electronic control
module acts as the central processor. It collects data from sensors
monitoring engine speed, boost pressure, coolant temperature, and
throttle position to precisely control the timing and duration of each
injection event. This results in precise fuel delivery across all load
ranges, leading to improved cold-start performance, reduced exhaust
smoke during transient loads, and optimized fuel consumption across the
power band.
The lubrication system is a high-capacity, gear-driven system designed
for extended service intervals and reliable operation under extreme
angles, particularly in marine and mobile applications. The system
utilizes a heavy-duty, positive-displacement gear pump that draws oil
from a deep-sump oil pan. Full-flow oil filters are complemented by a
bypass filter system that continuously cleans a portion of the oil,
removing fine contaminants to extend oil life.
The standard deep-sump lubrication system capacity is 405 Liters (107
gal). An integrated oil cooler, using either engine coolant or a
separate water circuit, maintains optimal oil viscosity. The system is
also equipped with a central oil manifold that supplies pressurized oil
to the main bearings, connecting rods, camshaft bearings, and the EUI
system’s actuating mechanism.
The cooling system is designed to manage the substantial thermal load
from both the engine block and the aftercooler. The engine-driven
centrifugal water pump circulates coolant through the cylinder block,
cylinder heads, and the oil cooler. The aftercooler system operates
either as a separate circuit (SCAC) or integrated with the jacket water
(JWAC).
In SCAC configurations, the system uses a separate pump and heat
exchanger to maintain charge air temperatures below that of the engine
coolant, which is critical for achieving higher power densities and
lower emissions. The engine’s internal coolant capacity is 233 Liters
(61.5 gal), though total system capacity varies significantly based on
the installation, such as the size of the radiator or keel cooler used
in marine applications.
| Intake and Exhaust Systems |
Air Intake System: The air intake system incorporates heavy-duty air
cleaners with a restriction indicator. The turbocharging system often
utilizes a dual-turbocharger configuration, with one turbocharger per
cylinder bank, ensuring efficient scavenging and boost pressure across
the engine’s operating range.
Exhaust System: The exhaust system is designed for high back-pressure
tolerance. The engine is equipped with water-cooled exhaust manifolds in
marine configurations to reduce surface temperatures and ensure safe
operation in engine rooms.
The engine is equipped with a 24-volt starting system, utilizing two or
more heavy-duty batteries. The charging system is handled by a
belt-driven alternator with outputs ranging from 50 to 150 amperes,
depending on the application’s electrical load demands.
For a standard industrial engine with a basic cooling system and
flywheel housing, the length is 2,850 mm (112.2 in), width is 1,850 mm
(72.8 in), and height is 1,850 mm (72.8 in). The core engine weight, as
noted, falls between 7,484 kg (16,500 lbs) and 8,070 kg (17,800 lbs). A
fully dressed generator set package, including the radiator, alternator,
and base frame, can reach lengths of over 5,200 mm (204.7 in) and total
operating weights exceeding 14,000 kg (30,864 lbs).
The 3516B is engineered for high availability with scheduled maintenance
intervals based on oil sampling and operational hours. In standard
continuous-duty applications, engine oil and filter change intervals are
typically recommended at 500 hours, though this can be extended to 1,000
hours with the use of Caterpillar’s SOS (Scheduled Oil Sampling)
analysis.
Fuel filter replacement is generally performed at 500-hour intervals.
Valve lash (clearance) inspection and adjustment is a critical periodic
service, usually required every 1,500 to 2,000 hours to ensure optimal
engine performance and longevity.
Cooling system coolant should be sampled and treated regularly, with
complete coolant replacement recommended at major overhaul intervals.
The engine is designed to facilitate a major overhaul in the chassis
(in-frame), allowing the replacement of cylinder packs, bearings, and
seals without removing the engine from its application.
Cylinder Head Nuts: 815 Nm (600 lb-ft).
Connecting Rod Cap Bolts: 110 Nm (81 lb-ft).
Main Bearing Cap Bolts: 270 Nm (200 lb-ft).
Flywheel Housing-to-Block Bolts: 270 Nm (200 lb-ft).
Fuel Injector Hold-Down Bolts: 55 Nm (41 lb-ft).
The Caterpillar 3516B engine is utilized across a broad spectrum of
heavy industries due to its scalability and power range.
Marine: It serves as a primary propulsion engine for medium to large
vessels, including tugboats, ferries, offshore supply vessels, and
fishing trawlers. In auxiliary roles, it functions as a marine generator
set (genset) providing shipboard power.
Mining: This engine is a cornerstone of surface mining operations. It
powers Caterpillar’s own ultra-class haul trucks, specifically the Cat
789C, 789D, 793C, and 793D models. It is also used in large hydraulic
excavators and as a power source for drilling rigs.
Power Generation: In the electric power sector, the 3516B is configured
as a generator set for prime power in remote locations, continuous power
for industrial facilities, and standby power for critical infrastructure
such as hospitals, data centers, and telecommunications hubs. Outputs
commonly range from 1,750 kVA to 2,500 kVA at 50 or 60 Hz.
Oil and Gas: The engine is utilized in land-based drilling rigs for top
drive power, in well servicing pumps for hydraulic fracturing and
workover operations, and in gas compression stations where it drives
compressors to move natural gas through pipelines.
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