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Caterpillar 3064 Engine

The Caterpillar 3064 is an in-line, 4-cylinder, four-stroke diesel engine with direct fuel injection. Developed in cooperation with Mitsubishi (based on the S4K platform), this power unit is widely utilized in compact and mid-sized construction equipment, most notably on CAT 311 and 312 series crawler excavators. The engine is recognized for its exceptional reliability and durability under severe operating conditions, achieved through a heavy-duty cast-iron cylinder block and highly efficient filtration systems.

The fuel system uses a conventional mechanical direct injection setup. It consists of a low-pressure fuel transfer pump, a primary fuel filter/water separator, a secondary fine-fuel filter, and an in-line multi-plunger fuel injection pump (injection pump assembly). Fuel is delivered to the mechanical multi-hole fuel injectors via high-pressure steel lines. The timing and synchronization of the injection pump are rigidly fixed to the timing gears (aligned using tooth timing marks without a locking pin). Excess fuel from the injectors is returned to the tank through a common fuel return line.

The lubrication system is a closed-type setup featuring forced oil circulation under pressure, driven by a gear-type oil pump. Oil flows through a full-flow oil filter and an integrated liquid-cooled oil cooler to maintain optimal viscosity. Under heavy loads, the underside of the pistons is cooled via dedicated piston cooling jets. The valve mechanism is lubricated through internal passages in the rocker arm shaft, aligning coaxially with the oil holes in the rocker bushings.

The engine utilizes a closed-type liquid cooling system with forced coolant circulation. This circulation is maintained by a centrifugal water pump driven by a belt from the crankshaft pulley. Rapid warm-up and precise operating temperature control of the cylinder block are managed by a bypass thermostat. The cooling jacket completely surrounds the cylinder bores to prevent local hot spots in the cylinder head and to minimize thermal distortion.

General Technical Data

Engine Specifications

Engine Model ............... Caterpillar 3064
Engine Type ............... 4-cycle inline 4-cylinder direct injection liquid-cooled diesel
Number of Cylinders ............... 4
Cylinder Arrangement ............... In-line
Engine Bore, in (mm) ............... 4.02 (102.0)
Engine Stroke, in (mm) ............... 5.12 (130.0)
Displacement, cu.in (L) ............... 259 (4.25)
Rated Engine Power, hp (kW) ............... 80 (62)
Rated Speed ............... 2000-2400 rpm
Idle Speed ............... 800-1000 rpm
Maximum Torque, Nm (lb-ft) ............... 300-340 (221-251) at 1600 rpm
Aspiration Type ............... Naturally aspirated
Operating Speed ............... 2400 rpm
Compression Ratio ............... 16.5:1
Firing Order ............... 1-3-4-2
Crankshaft Type ............... Forged steel
Piston Type ............... Cast-aluminum alloy
Con Rod Type ............... Forged steel
Cylinder Block Type ............... Cast iron
Cylinder Head Type ............... Cast iron
Lubrication System ............... Full-pressure
Oil Pump Type ............... Gear-driven
Oil Filter Type ............... Full-flow, spin-on
Cooling System ............... Liquid-cooled
Water Pump Type ............... Gear-driven, centrifugal
Air Cleaner Type ............... Dry two-stage
Starting System ............... Electric Starter
Electrical System ............... 24V
Alternator Rating, Amps ............... 45-65

Fuel System

Fuel System ............... Direct injection
Injection Pump Type ............... Mechanical
Fuel Injector Type ............... Multi-hole pencil-type
Governor Type ............... Mechanical
Fuel Type ............... Diesel Fuel

Dimensions and Weight

Overall Length, in (mm) ............... 33.4 (850)
Overall Width, in (mm) ............... 23.6 (600)
Overall Height, in (mm) ............... 33.4 (850)
Dry Weight, lbs (kg) ............... 772-882 (350-400)

Maintenance Data

Service Information

Thermostat begins opening ............... 71C (160F)
Thermostat fully open ............... 90C (193F)
Cooling system pressure ............... 70-90 kPa (10-13 psi)
Operating oil pressure ............... 275-413 kPa (40-60 psi)
Intake Valve Clearance, in (mm) ............... 0.010 (0.25)
Exhaust Valve Clearance, in (mm) ............... 0.010 (0.25)

Engine Oil and Coolant

Engine Oil Type .................. SAE 10W-30, 15W-40
API Service Classifications ......................... CF-4, CG-4, CH-4, or CI-4
Engine Oil Capacity, qts (L) .................. 13.6 (13.0)
Coolant Capacity, qts (L) ............... 18.4 (17.5)

Service Intervals

Change oil and filter ............... Every 250 hours
Replace fuel filters ............... Every 500 hours
Inspect air filter ............... Every 50 hours
Change coolant ............... Every 2 years
Valve-lash adjustment ............... Every 1000 hours
Injector inspection ............... Every 1000-1500 hours
Compression test ............... Every 2000 hours
Belt inspection ............... As required

Service Specifications

Cylinder Bore Inside Diameter, in (mm) ................ 4.0157-4.0167 (102.000-102.025)
Crankshaft Journal Outside Diameter, in (mm) ................ 2.9512-2.9520 (74.960-74.980)
Crank Pin Outside Diameter, in (mm) ................ 2.3614-2.3622 (59.980-60.000)
Crankshaft End Play, in (mm) ................ 0.0020-0.0098 (0.050-0.250)
Intake Valve Stem Outside Diameter, in (mm) ................ 0.2740-0.2746 (6.961-6.975)
Exhaust Valve Stem Outside Diameter, in (mm) ................ 0.2736-0.2741 (6.950-6.962)
Intake Valve Guide Inside Diameter (Installed), in (mm) ................ 0.2756-0.2764 (7.000-7.020)
Exhaust Valve Guide Inside Diameter (Installed), in (mm) ................ 0.2756-0.2764 (7.000-7.020)
Intake Valve Stem to Guide Clearance, in (mm) ................ 0.0010-0.0023 (0.025-0.059)
Exhaust Valve Stem to Guide Clearance, in (mm) ................ 0.0015-0.0028 (0.038-0.070)
Intake Valve Spring Free Length, in (mm) ................ 1.8543 (47.100)
Exhaust Valve Spring Free Length, in (mm) ................ 1.8543 (47.100)
Intake Cam Height, in (mm) ................ 1.8504 (47.000)
Exhaust Cam Height, in (mm) ................ 1.8504 (47.000)
Piston Pin Outside Diameter, in (mm) ................ 1.3386-1.3390 (34.000-34.011)
Piston Pin to Piston Bore Clearance, in (mm) ................ 0.0003-0.0007 (0.007-0.018)
Top Ring Side Clearance, in (mm) ................ 0.0031-0.0047 (0.080-0.120)
Second Ring Side Clearance, in (mm) ................ 0.0031-0.0050 (0.080-0.127)
Oil Ring Side Clearance, in (mm) ................ 0.0010-0.0026 (0.025-0.065)
Top Ring End Gap, in (mm) ................ 0.0118-0.0197 (0.300-0.500)
Second Ring End Gap, in (mm) ................ 0.0118-0.0197 (0.300-0.500)
Oil Ring End Gap, in (mm) ................ 0.0098-0.0177 (0.250-0.450)

Tightening Torque Specs

Cylinder head bolts ............... 118 ± 5 Nm (87 ± 4 lb-ft)
Main bearing caps ............... 137 ± 5 Nm (100 ± 4 lb-ft)
Connecting rod bolts ............... 103 ± 5 Nm (75 ± 4 lb-ft)
Flywheel bolts ............... 185 Nm (137 lb-ft)
Crankshaft pulley bolt ............... 490 ± 10 Nm (360 ± 7 lb-ft)
Rocker Shaft Bolts ............... 10-20 Nm (7-15 lb-ft)
Exhaust Manifold Nuts ............... 18 ± 4 Nm (13 ± 3 lb-ft)

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• Caterpillar Engines Specs
  
• Cat 3064T Specs
  
• Cat 3066 Specs
  
• Cat 3114 Specs
  
• Cat 3116 Specs
  
• Cat 3116T Specs
  
• Cat 3116TA Specs
  

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