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International BC144 Engine

The International Harvester BC144 is an overhead-valve, 4-cylinder, inline gasoline engine designed for industrial and agricultural applications. It prominently powered equipment such as the International Harvester B-414 utility tractor, 3414 loader tractors, 3444 tractors, and 500 series crawlers. Built for durability and steady torque output under sustained loads, the engine shares a foundational design layout with its diesel counterpart, the BD144, but utilizes a lower compression ratio optimized for gasoline fuel dynamics.

The engine utilizes an overhead valve (OHV) design featuring two valves per cylinder actuated via pushrods and rocker arms driven by a gear-driven camshaft inside the cylinder block. Total displacement measures 143.1 cubic inches (2.3 liters). Internal architecture features a cylinder bore of 3.375 inches (86 mm) and a piston stroke of 4.00 inches (102 mm), running at a static compression ratio of 6.3:1.

The induction system utilizes a naturally aspirated carbureted design engineered to process standard gasoline. Combustion air is cleaned via an oil-bath type air cleaner assembly to scrub debris before entering the intake manifold. Cylinders fire in a strict 1-3-4-2 order.

Engine lubrication is maintained by a full-pressure wet-sump system driven by an internal oil pump. The system has a total oil capacity of 5 quarts (4.7 liters) including filter replacement. Thermal management relies on a heavy-duty, liquid-cooled layout driven by a belt-driven water pump to circulate coolant through the engine block and cylinder head.

General Technical Data

Engine Specifications

Engine Model ............... International Harvester BC144
Engine Type ............... 4-stroke inline 4-cylinder overhead valve liquid-cooled gasoline
Number of Cylinders ............... 4
Cylinder Arrangement ............... In-line
Engine Bore, in (mm) ............... 3.375 (85.73)
Engine Stroke, in (mm) ............... 4.000 (101.6)
Displacement, cu.in (L) ............... 143.1 (2.34)
Rated Engine Power, hp (kW) ............... 43.5 (32.4) at 2000 rpm
Gross Engine Power, hp (kW) ............... 43.5 (32.4)
Net Engine Power, hp (kW) ............... 35.0 (26.1) at 1875 rpm
Rated Engine Speed, rpm ............... 1875-2000
Peak Torque, lb-ft (Nm) ............... 116.0 (157.3) at 1300 rpm
Low Idle Speed, rpm ............... 600-650
High Idle Speed, rpm ............... 2150-2200
Compression Ratio ............... 6.3:1
Firing Order ............... 1-3-4-2
Cylinder Block Material ............... Cast iron
Cylinder Head Material ............... Cast iron
Valve Configuration ............... Overhead valve setup
Valves Per Cylinder ............... 2
Direction of Rotation ............... Clockwise from front view
Lubrication System Type ............... Full-pressure recirculation
Oil Pump Type ............... Gear-driven positive displacement
Oil Filter Type ............... Full-flow disposable spin-on cartridge
Cooling System Type ............... Forced circulation liquid-cooled
Water Pump Type ............... Belt-driven centrifugal
Air Cleaner Type ............... Heavy-duty oil bath fluid system
Ignition System ............... Distributor with coil and points
Spark Plug Type ............... Champion D16 or equivalent
Spark Plug Gap, in (mm) ............... 0.025 (0.635)
Distributor Point Gap, in (mm) ............... 0.014 (0.356)
Static Ignition Timing ............... 5 deg BTDC
Maximum Advance Timing ............... 39 degrees BTDC
Starting System Type ............... Electric starter motor
Electrical System Voltage, V ............... 12
Fuel System

Fuel Type Designation ............... Gasoline regular grade unleaded
Carburetor Manufacturer ............... Zenith or Carter precision model
Carburetor Type ............... Updraft single barrel down-flow style
Fuel Feed Type ............... Mechanical diaphragm lift pump
Fuel Transfer Pump Drive ............... Camshaft eccentric lobe driven
Fuel Filter Element ............... Mesh screen with sediment glass bowl
Governor Type ............... Mechanical centrifugal flyweight
Main Jet Size Standard ............... Fixed metering orifice configuration
Idle Jet Size Standard ............... Adjustable air bleed needle style
Choke Mechanism Type ............... Manual cable operated butterfly flap
Throttle Body Bore, in (mm) ............... 1.250 (31.75)
Venturi Diameter, in (mm) ............... 0.937 (23.81)
Float Level Setting, in (mm) ............... 0.281 (7.14)
Float Drop Limit, in (mm) ............... 0.500 (12.70)
Fuel Pump Pressure, psi (kPa) ............... 2.5-4.0 (17.2-27.5)
Air Intake System Pipe, in (mm) ............... 1.750 (44.45)

Dimensions and Weight

Overall Length, in (mm) ............... 30.5 (775)
Overall Width, in (mm) ............... 22.2 (565)
Overall Height, in (mm) ............... 31.7 (805)
Dry Weight, lbs (kg) ............... 425 (190)
Wet Weight, lbs (kg) ............... 460 (210)

Maintenance Data

Service Information

Compression Pressure Minimum, psi (bar) ............... 120.0 (8.27)
Maximum Compression Variation, psi (bar) ............... 15.0 (1.03)
Engine Oil Pressure Standard, psi (bar) ............... 30.0-45.0 (2.06-3.10)
Engine Oil Pressure Idle Minimum, psi (bar) ............... 10.0 (0.68)
Thermostat Opening Temperature, F (C) ............... 170 (77)
Thermostat Full Open Temperature, F (C) ............... 199 (93)
Valve Clearance (Intake), in (mm) ............... 0.020-0.022 (0.508-0.558)
Valve Clearance (Exhaust), in (mm) ............... 0.020-0.022 (0.508-0.558)

Engine Oil and Coolant

Engine Oil Type .................. SAE 30, 10W-30, or 20W-50
API Service Classifications ......................... SD or higher
Engine Oil Capacity with Filter, qts (L) ............... 5.0 (4.7)
Engine Oil Capacity Dry Base, qts (L) ............... 6.0 (5.6)
Cooling System Capacity, qts (L) ............... 10.0 (9.5)
Oil Bath Air Cleaner Oil Capacity, qts (L) ............... 0.5 (0.47)

Service Intervals

Change oil and filter ............... Every 200 hours
Inspect air filter ............... Every 100 hours
Valve clearance adjustment ............... Every 500 hours
Fuel system inspection ............... Every 1000 hours
Change coolant ............... Every 1000 hours
Spark plug replacement ............... Every 500 hours
Check distributor points ............... Every 500 hours

Service Specifications

Cylinder Bore Diameter Standard, in (mm) ............... 3.3750-3.3765 (85.725-85.763)
Cylinder Bore Out of Round Maximum, in (mm) ............... 0.0015 (0.0381)
Cylinder Bore Taper Wear Limit, in (mm) ............... 0.0020 (0.0508)
Maximum Allowable Cylinder Rebore, in (mm) ............... 0.060 (1.524)
Sleeve Flange Stand In Height, in (mm) ............... 0.001-0.004 (0.025-0.101)
Cylinder Block Deck Flatness Limit, in (mm) ............... 0.003 (0.0762)
Main Bearing Bore Diameter Housing, in (mm) ............... 2.312-2.313 (58.72-58.75)
Camshaft Bore Diameter Front Housing, in (mm) ............... 1.811-1.812 (45.99-46.02)
Camshaft Bore Diameter Center Housing, in (mm) ............... 1.577-1.578 (40.05-40.08)
Camshaft Bore Diameter Rear Housing, in (mm) ............... 1.499-1.500 (38.07-38.10)
Piston Outer Diameter Grade Standard, in (mm) ............... 3.3715-3.3725 (85.636-85.661)
Piston Skirt Diametral Clearance, in (mm) ............... 0.0031-0.0039 (0.078-0.099)
Piston Pin Bore Diameter Size, in (mm) ............... 0.8751-0.8754 (22.227-22.235)

Tightening Torque Specs

Cylinder Head Bolts ............... 40-45 lb-ft (54-61 Nm).
Connecting Rod Cap Nuts ............... 33-36 lb-ft (45-49 Nm)
Main Bearing Cap Bolts ............... 70-75 lb-ft (95-102 Nm)
Flywheel Bolts ............... 45-50 lb-ft (61-68 Nm)
Crankshaft Pulley Bolt ............... 80-90 lb-ft (108-122 Nm)
Rocker Arm Assembly Bolts ............... 18-22 lb-ft (24-30 Nm)
Intake Manifold Nuts ............... 15-18 lb-ft (20-24 Nm)
Exhaust Manifold Nuts ............... 18-22 lb-ft (24-30 Nm)
Spark Plugs ............... 25-30 lb-ft (34-41 Nm)
Oil Pan Drain Plug ............... 20-25 lb-ft (27-34 Nm)
Valve Adjustment Locknuts ............... 12-15 lb-ft (16-20 Nm)

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