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Caterpillar 3064T Engine

The Caterpillar 3064T is a 4.25-liter, inline 4-cylinder, four-stroke cycle diesel engine developed primarily for construction and earthmoving equipment. It is widely recognized as a joint development platform co-produced with Mitsubishi (associated with the Mitsubishi S4K-T engine architecture). It features a compact footprint, a heavy-duty cast iron block design, and an induction-hardened, one-piece forged crankshaft to minimize operating vibrations. It is engineered specifically to yield a high torque rise at middle RPM ranges, maximizing operational productivity under heavy hydraulic loads.

The fuel layout operates on a mechanical direct-injection or indirect-injection pump configuration depending on application serialization. A mechanical fuel transfer lift pump extracts fuel from the storage tank, passing it through a primary water separator filter and a high-efficiency secondary spin-on fuel filter to capture particulate contaminants. The pressurized fuel enters the main fuel injection pump assembly. Timing synchronization is strictly governed mechanically through an integrated gear train alignment within the front housing, using specialized reference paint-marks on the idler and fuel pump drive gears rather than a standard timing pin lock. High-pressure lines deliver fuel directly to individual fuel injection nozzles at a uniform line-tightening torque specification of 25 N·m (18 lb-ft), with excess fuel recovered and returned to the circuit via a manifold-mounted fuel return line.

The lubrication circuit utilizes a pressure-fed distribution design driven by a gear-type oil pump. Engine oil is forced through an integrated plate-type oil cooler core mounted on the engine block to regulate heat under load before arriving at the primary spin-on oil filter. Handled by standard CAT filtration, the pressurized oil flows through internal oil passages to lubricate the main bearings, camshaft bushings, and connecting rod bearings. Piston cooling nozzles are installed within the lower crankcase block structure to provide continuous under-piston oil spraying, safeguarding against excessive heat build-up.

This engine relies on a high-efficiency liquid-cooled thermal management circuit. Forced coolant circulation is managed by a front-mounted, belt-driven centrifugal water pump assembly. The fluid absorbs heat from the cylinder block liners and the cylinder head passages before routing to the thermostat housing. A mechanical wax-pellet type thermostat regulates coolant directional flow. It restricts path movement back to the radiator during cold-start operations to accelerate optimal heating, and redirects high-temperature coolant through the external radiator and swing-out oil cooler assembly once the structural operating limit is exceeded.

General Technical Data

Engine Specifications

Engine Model ............... Caterpillar 3064T
Engine Type ............... 4-cycle inline 4-cylinder direct injection turbocharged 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) ............... 94 (70)
Rated Speed ............... 2000-2400 rpm
Idle Speed ............... 800-1000 rpm
Maximum Torque, Nm (lb-ft) ............... 372 (274) at 1600 rpm
Aspiration Type ............... Turbocharged
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) ............... 770-880 (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) .................. 18.4 (17.5)
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 3064 Specs
  
• Cat 3066 Specs
  
• Cat 3114 Specs
  
• Cat 3116 Specs
  
• Cat 3116T Specs
  
• Cat 3116TA Specs
  

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