Cat 3064 Specifications
| Engine Model: Caterpillar 3064 |
| Engine Type: 4-stroke in-line 4-cylinder liquid-cooled diesel |
| Total Displacement: 259 cu.in (4.25 L) |
| Rated Engine Power: 74-89 Hp (55-66 kW) at 2400 rpm |
| Fuel System Type: Direct injection |
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The Caterpillar 3064 is a 4.25-liter,
4-cylinder diesel engine that served as a cornerstone of Caterpillar’s
compact and medium-sized machinery lineup during its production.
Designed with a focus on durability, serviceability, and mechanical
reliability, this engine is a 4-cycle, in-line unit that utilizes a
direct injection fuel system.
Its robust construction, featuring a parent bore cylinder block, makes
it a preferred power source for demanding applications such as hydraulic
excavators and material handlers. The 3064 was engineered to provide a
balance of power and fuel efficiency, operating across a range of speeds
suitable for both constant-speed industrial applications and
variable-speed mobile equipment.
The Caterpillar 3064 is fundamentally a naturally aspirated or
turbocharged diesel engine, though the vast majority of units found in
mobile applications are turbocharged to meet the power demands of
hydraulic systems. Its architecture is defined by a rigid, in-line
configuration that minimizes engine width while maintaining structural
integrity. The engine operates on a four-stroke cycle, utilizing a
direct injection combustion system where fuel is injected directly into
the cylinder, promoting efficient combustion and high thermal
efficiency.
Engine Type: 4-cycle, In-line, 4-cylinder diesel
Displacement: 4.25 Liters (259 cu.in)
Bore and Stroke: 104 mm x 125 mm (4.09 in x 4.92 in)
Aspiration: Turbocharged or Naturally Aspirated
Combustion System: Direct Injection
Firing Order: 1-3-4-2
Rotation: Counterclockwise (facing flywheel)
Rated Power: 55 kW to 66 kW (74 HP to 89 HP)
Rated Speed: 2000-2400 RPM (depending on application)
Maximum Torque: 300 Nm to 340 Nm (221-251 lb-ft) @ 1600 RPM
Idle Speed: 800-1000 RPM
The cylinder block on the Caterpillar 3064 is a single-piece, high-grade
cast iron casting. It employs a parent bore design, meaning the pistons
run directly in machined bores within the block itself rather than in
removable wet or dry liners.
This non-sleeve design contributes to a stiffer, more compact block with
improved heat transfer from the piston rings to the coolant jacket. The
deep-skirt design provides rigid support for the five main bearings,
ensuring the crankshaft remains stable under heavy loads. For overhaul
purposes, the engine allows for boring the block to accept oversized
pistons, extending the service life of the core component.
The cylinder head is constructed from cast iron to match the thermal
expansion properties of the block, ensuring a reliable seal under the
multi-step torque procedure. It features an overhead valve (OHV)
arrangement, which positions the valves in the head and is actuated by
pushrods and rocker arms driven from the camshaft located in the block.
Each cylinder is served by two valves: one intake and one exhaust.
The valve seat inserts are hardened to withstand the high temperatures
of the direct injection combustion process, particularly in turbocharged
configurations where exhaust gas temperatures are elevated. The valve
guide material is selected for wear resistance to maintain precise valve
alignment over extended operational hours.
The fuel system is a mechanically governed, direct injection system
designed for reliability and field serviceability. The system is
centered around an in-line injection pump, commonly of Bosch-style
design, which is driven by the engine’s timing gears. This pump uses a
mechanical governor to regulate fuel delivery based on engine speed and
load, providing precise control for both low-speed idling and high-speed
rated power.
High-pressure fuel lines carry the fuel to the unit injectors or nozzle
assemblies located in the cylinder head. This mechanical system operates
independently of electronic control units (ECUs), making it robust in
environments where electrical interference or moisture could be a
concern.
The lubrication system is a pressurized, full-flow filtration system
designed to provide consistent oil supply to all critical moving parts.
A gear-type oil pump, driven by the crankshaft, draws oil from the sump
and forces it through a full-flow oil filter before it is distributed to
the main bearings, connecting rods, camshaft bearings, and valve train.
Oil Capacity: 9.5 to 12.0 Liters (10.0-12.7 U.S. Quarts), depending on
oil pan configuration and filter size. Oil Pressure: 40-60 PSI at rated
speed, ensuring adequate hydrodynamic lubrication for the parent bore
cylinder walls and crankshaft bearings.
The cooling system utilizes a centrifugal water pump, typically driven
by the same serpentine belt as the alternator, to circulate coolant
through the block and cylinder head. The system is designed to maintain
optimal operating temperatures for combustion efficiency and component
longevity. Coolant Capacity: 8.0 Liters (Engine only), excluding
radiator and external hoses.
Thermostat: Starts opening at 71°C (160°F) or 76.5°C (170°F), with a
fully open position at a higher temperature to regulate flow to the
radiator. The system is engineered to maintain stable temperatures even
under the sustained high-load conditions common in excavator operations.
In turbocharged variants, the system includes a turbocharger mounted to
the exhaust manifold. Compressed air is often passed through an
aftercooler (air-to-air or air-to-water) before entering the intake
manifold to increase charge density and reduce combustion temperatures.
A dry-type, two-stage air cleaner with a dust ejector is standard
equipment to protect the engine in dusty environments.
The standard electrical configuration for machinery applications is a
24-volt system. This includes a high-torque 24-volt starting motor to
ensure reliable cranking in cold conditions and a 24-volt alternator
with sufficient output to support the machine’s hydraulic solenoids,
lighting, and control systems while maintaining battery charge.
0Weight (Dry): 340 kg to 365 kg (750-805 lbs).
Length: 700-800 mm.
Width: 500-600 mm.
Height: 800-900 mm.
Regular maintenance intervals are defined by operating hours rather than
mileage, adhering to Caterpillar’s standard for heavy equipment. The
direct injection system and parent bore design necessitate strict
adherence to oil change intervals to prevent ring sticking and bore
polishing.
Oil Change Interval: 250-500 hours, dependent on oil analysis and
operating conditions. Fuel Filter Replacement: Recommended at 500-hour
intervals or sooner if fuel quality is poor, utilizing a spin-on primary
and secondary filter arrangement.
Valve Lash Adjustment: Required periodically to compensate for wear in
the valve train. Intake and exhaust valves have specific clearance
settings measured at the rocker arm-to-valve stem interface when the
engine is at operating temperature.
Air Filter Service: Utilizes a primary and secondary air filter element;
the primary element should be replaced based on restriction indicator
readings, while the secondary element is generally replaced only when
the primary is serviced.
Cylinder Head Bolts: 118 ± 5 Nm (87 ± 4 lb-ft)
Connecting Rod Nuts: 103 ± 5 Nm (75 ± 4 lb-ft)
Main Bearing Bolts: 137 ± 5 Nm (100 ± 4 lb-ft)
Flywheel Bolts: 185 Nm (137 lb-ft)
Rocker Shaft Bolts: 10-20 Nm (7–15 lb-ft)
Crankshaft Pulley (Nut): 490 ± 10 Nm (360 ± 7 lb-ft)
Exhaust Manifold Nuts: 18 ± 4 Nm (13 ± 3 lb-ft)
The Caterpillar 3064 engine was primarily designed for integration into
Caterpillar’s own machinery lineup, with a strong focus on hydraulic
excavators.
Excavators: This engine is the factory power unit for the Cat 311, 311B,
311C, 312, 312B, and 312C models. In these applications, the engine is
calibrated to provide consistent power for hydraulic pumps that drive
the swing, travel, boom, stick, and bucket functions.
Industrial: Beyond excavators, the 3064 was utilized in various smaller
hydraulic power units, industrial tractors, and material handlers. Its
mechanical fuel system and durable construction made it a candidate for
applications requiring reliable power in environments where electronic
engine management was not desired or practical.
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