Cat 3176B Specifications
| Engine Model: Caterpillar 3176B |
| Engine Type: 4-cycle inline 6-cylinder turbocharged and aftercooled diesel |
| Total Displacement: 629 cu.in (10.3 L) |
| Rated Engine Power: 350-365 Hp (261-272 kW) at 2100 rpm |
| Fuel System Type: Electronic unit injector (EUI) |
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The Caterpillar 3176B is a direct evolution of
the 3176, representing a refined and upgraded inline six-cylinder,
10.3-liter heavy-duty diesel engine. As a primary powerplant for
late-1990s heavy-duty trucks and industrial machinery, it incorporated
significant improvements aimed at enhanced reliability, increased power
density, and better fuel economy.
The "B-Series" designation signifies these engineering updates, which
included advancements in the electronic unit injector system, a revised
turbocharger and aftercooling package, and updated electronic controls.
It retains the foundational heavy-duty architecture of its predecessor -
including the deep-skirt block, cross-bolted mains, and wet cylinder
liners - while delivering more precise fuel management and meeting
stricter emissions standards. The 3176B is recognized for its strong
performance in long-haul trucking and severe industrial service.
Engine Type: Inline 6-Cylinder, Four-Stroke Cycle Diesel.
Aspiration: Turbocharged and Air-to-Air Aftercooled (ATAAC).
Displacement: 10.3 Liters (629 cubic inches).
Bore: 125 mm (4.92 inches).
Stroke: 140 mm (5.51 inches).
Engine Power (On-Highway Trucks): 350-365 Hp (261-272 kW).
Engine Power (Marine): 450 Hp (335 kW), 525 Hp (391 kW), or 600 Hp (447
kW) at 2300 RPM.
Compression Ratio: 16.0:1.
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, Version II or later.
Emission Certification: Certified to U.S. EPA 1998 heavy-duty on-highway
emissions standards.
The cylinder block is a high-rigidity, deep-skirt cast iron design. It
employs replaceable wet-type cylinder liners, pressed into the block and
sealed at the top with a copper composition gasket under a
precision-machined flange. The lower end structure features a
cross-bolted main bearing design.
Each of the seven nodular iron main bearing caps is secured by two
vertical bolts and four horizontal cross bolts that thread into the
block's lower skirt, creating an exceptionally rigid foundation for the
crankshaft. This design manages the high cylinder pressures associated
with the engine's power output. The gear-driven camshaft 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 design uses four valves per cylinder -
two intake and two exhaust - to facilitate efficient airflow and
combustion. Hardened valve seat inserts provide extended service life.
Valve guides are replaceable.
The valve train incorporates hydraulic lash adjusters, positioned in the
cylinder head, which act on roller-type rocker arms. This system
eliminates the requirement for scheduled manual valve lash adjustment.
The cylinder head gasket is a multi-layer steel (MLS) design, engineered
to seal high combustion pressures reliably.
The 3176B utilizes Caterpillar's advanced Electronically Controlled Unit
Injector (EUI) system. Each cylinder features a self-contained unit
injector that combines a high-pressure pumping element and a
solenoid-controlled nozzle. 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, enabling injection pressures exceeding 23,000 psi (1585 bar).
A gear-type transfer pump supplies fuel from the tank, circulating it
through a primary filter/water separator and a secondary filter before
delivery to the injectors.
Lubrication is provided by a high-capacity gear-type oil pump driven
from the front gear train. Oil is drawn from the deep-cast aluminum or
steel sump through a pickup tube and screen. The oil is then forced
through a full-flow, spin-on oil filter. A bypass valve protects the
system in the event of filter restriction.
Filtered oil is directed to the main oil gallery and subsequently
supplied to the crankshaft main and connecting rod bearings, camshaft
bearings, turbocharger, and valve train. The system incorporates piston
cooling jets that spray a continuous stream of oil onto the underside of
each piston for critical heat management. An oil-to-water cooler is
standard.
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. Engine operating temperature is regulated by a wax-pellet
thermostat.
The system employs an air-to-air aftercooler (ATAAC) core, mounted in
the charge air circuit, to cool the turbocharged intake air, increasing
its density and improving combustion efficiency. The engine cooling
system is designed for high heat rejection and must be connected to a
radiator or heat exchanger of appropriate capacity for the specific
application.
Starting System: 12-volt or 24-volt electric starting motor with a
dedicated magnetic switch. Charging System: A heavy-duty brushless
alternator, commonly rated between 130 and 160A. Air Intake System: A
dry-type, two-stage air cleaner system with a primary safety element and
a main filter, equipped with an air restriction indicator. Exhaust
System: A tuned, divided-entry cast iron exhaust manifold optimizes
turbocharger response by pairing cylinders. An electronically controlled
wastegate regulates boost pressure based on ECM commands.
Electronic Control: Governed by the Advanced Digital Electronic Control
(ADEC) module. This system monitors a comprehensive array of sensors for
performance optimization, fault logging, and diagnostics via SAE
J1708/J1587 data link. It features enhanced software for improved fuel
mapping and diagnostics over earlier 3176 models.
Physical dimensions are application-dependent. For a standard on-highway
truck configuration, approximate length is 1545 mm (60.8 inches), width
is 965 mm (38.0 inches), and height is 1003 mm (39.5 inches). The net
dry engine weight, including standard accessories such as the alternator
and starter motor but excluding fluids, is approximately 1175 kg (2590
pounds). Some industrial and marine variants, stripped of on-highway
components, may have a lower base weight, around 860 kg (1896 pounds).
Engine Oil Grade: Use engine oil meeting Caterpillar’s ECF-1-a
specification, equivalent to API CH-4. Oils meeting API CG-4 are not
approved for extended drain intervals. SAE 15W-40 is standard for
general operation.
Oil Change Interval: Dictated by application, fuel consumption, and oil
analysis. For on-highway trucks, extended intervals of up to 50,000
miles (80,000 km) were achievable with specified oil and filters.
Severe-service applications require more frequent changes, often at
500-hour intervals.
Oil System Capacity: Total refill capacity, including a filter change,
is 34.0 Liters (9.0 US gallons). Cooling System Capacity: Total cooling
system capacity, including radiator, is approximately 49.0 Liters (13.0
US gallons).
Fuel Filter: Replace primary and secondary fuel filter elements at
scheduled service intervals, often aligned with oil change intervals.
Air Filter: Service intervals are determined by the restriction gauge.
The primary safety element is cleaned, and the main filter is replaced
when necessary. Valve Lash Adjustment: The hydraulic lash adjuster
system requires no scheduled mechanical adjustment.
Engine Coolant: Use Caterpillar Extended Life Coolant (ELC) or a
conventional coolant with a 50/50 ethylene glycol mix and properly
maintained Supplemental Coolant Additive (SCA) levels to prevent liner
cavitation and system corrosion.
Cylinder Head Bolts: Tighten in a specific three-step sequence. Final
torque: 300 Nm (221 lb-ft). A final angular turn of 90 degrees is
required. Main Bearing Cap Bolts (Vertical): 340 Nm (251 lb-ft) plus an
additional 90-degree turn. Main Bearing Cap Cross Bolts: 190 Nm (140
lb-ft). Flywheel Housing-to-Block Bolts: 190 Nm (140 lb-ft).
Connecting Rod Cap Bolts: 190 Nm (140 lb-ft) plus an additional
90-degree turn. 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 Caterpillar 3176B engine served as a
key powerplant in demanding sectors:
On-Highway Trucks: Extensively specified in premium long-haul tractors
from Kenworth (T2000, W900), Peterbilt (379, 387), Freightliner (Classic
XL, Century Class), and Navistar International (9000 series, 8000
series). Construction/Mining: Found in Caterpillar 966G Series II, 972G
Series II Wheel Loaders; 325B, 330B L Excavators; and various rock
trucks and material handlers.
Marine Propulsion: A preferred engine for commercial workboats,
tugboats, and high-performance pleasure craft, with continuous-duty
"E-Ratings" delivering up to 600 horsepower at 2300 RPM. Industrial:
Used in large generator sets (250-400 kVA), high-pressure pump drives,
and oilfield service equipment such as frac pumps. Specialty Vehicles:
Powered heavy-duty fire apparatus, airport crash trucks, and crane
carriers.
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