International C200 Specifications
| Engine Model: International Harvester C200 |
| Engine Type: 4-stroke in-line 4-cylinder liquid-cooled gasoline |
| Total Displacement: 200.3 cu.in (3.28 L) |
| Rated Engine Power: 75-80 Hp (56-59 kW) at 2400 rpm |
| Fuel System Type: Updraft carburetor |
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The International C200 engine is a testament to
the industrial engine design principles of the 1970s. It is an
overhead-valve (OHV), inline-4 configuration with a displacement of
200.3 cubic inches (3.28 liters). The engine is characterized by its
under-square bore and stroke dimensions of 3.875 inches by 4.250 inches,
a design choice that favors low-end rotational force (torque) at the
expense of high-rpm breathing.
The compression ratio is a low 7.5:1, which permits operation on
lower-octane fuels and contributes to the engine’s long service life
under heavy load. Power delivery is managed by a mechanical, gear-driven
flyweight governor that maintains consistent engine speed regardless of
load fluctuation - a critical feature for PTO-driven implements. The
fuel system employs an updraft carburetor, a design that reduces the
risk of fuel flooding into the crankcase.
The valvetrain operates with pushrods and solid lifters, requiring
periodic manual valve lash adjustments. While the engine produces only
75-80 gross horsepower at 2,400 rpm, its peak torque arrives between
1,400 and 1,600 rpm, delivering a flat, usable power curve well-suited
to pulling heavy loads at reduced engine speeds. The C200 is not a
high-speed powerplant but a durable, high-torque workhorse designed for
thousands of hours of operation in harsh conditions.
Engine Type: 4-cycle, Overhead Valve (OHV), Inline-4
Aspiration: Naturally Aspirated
Displacement: 200.3 cu.in (3.28 L)
Bore: 3.875 in (98.4 mm)
Stroke: 4.250 in (108.0 mm)
Compression Ratio: 7.5:1
Firing Order: 1-3-4-2
Gross Horsepower: 75-80 hp @ 2,400 rpm (engine only)
PTO Horsepower: 62-66 hp @ 2,400 rpm (tractor application)
Drawbar Horsepower: 54-56 hp
Maximum Torque: 180-190 lb-ft (244-258 Nm) @ 1,400-1,600 rpm
Rated Operating Speed: 2,400 rpm
Idle Speed (Low): 500-600 rpm
Governed Maximum No-Load Speed: 2,560-2,600 rpm
The cylinder block is constructed from high-grade cast iron, providing
the rigidity and mass necessary for a heavy-duty, low-stress industrial
engine. The block features an open-deck design but is distinguished by
its use of replaceable wet cylinder sleeves (liners). Each of the four
cylinders is fitted with a spun-cast iron sleeve that contacts the
engine coolant directly on its outer surface, a design that promotes
excellent heat transfer from the combustion chamber to the cooling
system.
The wet sleeve arrangement also allows for cost-effective rebuilds, as
worn cylinders can be restored by installing new sleeves without
requiring a complete block replacement. The crankcase is deep-skirted,
extending below the crankshaft centerline to provide additional
structural support. The block incorporates a gear-driven camshaft
located on the right side of the engine, typical for International
Harvester designs of this era. Main bearing bulkheads are reinforced,
housing three main bearings supporting the crankshaft. The water jacket
completely surrounds all four cylinder sleeves for uniform cooling.
The cylinder head is a single, cast-iron cross-flow design. It is
attached to the block using a series of studs or bolts, with the
combustion chambers formed as shallow bathtub configurations within the
head casting. The overhead valve arrangement uses a simple, reliable
pushrod valvetrain. A single camshaft located in the cylinder block
operates mechanical lifters (solid tappets), which transfer motion
through pushrods to cast-iron rocker arms.
These rocker arms actuate the valves, which are arranged in a straight
line along the cylinder head. The valve angles are inclined to optimize
combustion chamber shape and airflow. Intake and exhaust valves are made
from heat-resistant silichrome steel. The valve seats are
induction-hardened directly into the cylinder head casting for
durability.
Valve lash adjustment is performed at the rocker arm-to-valve stem
interface using a screw-and-locknut arrangement. The cylinder head also
houses the spark plugs, which are positioned to provide a central
ignition point within each combustion chamber. The head gasket is a
composite steel-asbestos (historically) or modern equivalent material
designed to seal cylinder pressures while accommodating the wet sleeve
protrusion above the block deck.
The fuel system consists of a fuel tank, a mechanical fuel pump, an
updraft carburetor, and a mechanical governor. The fuel pump is a
diaphragm-type unit mounted on the cylinder block, actuated by an
eccentric lobe on the camshaft. It draws fuel from the tank and delivers
it to the carburetor bowl at low pressure. The carburetor is an updraft
design (air and fuel enter from below), commonly sourced from Zenith or
Marvel-Schebler. An updraft configuration routes the air-fuel mixture
upward through the intake manifold, reducing the chance of liquid fuel
draining into the crankcase during cranking or idle.
The carburetor includes an idle circuit, a main metering circuit, a
power enrichment circuit, and a choke for cold starts. The mechanical
governor is a gear-driven flyweight unit mounted externally. The
governor connects directly to the carburetor throttle plate via a
linkage. When engine speed drops below a set point, centrifugal
flyweights move inward, opening the throttle to increase fuel flow. When
speed exceeds the set point, flyweights move outward, closing the
throttle. This system maintains near-constant engine speed under varying
loads without operator intervention.
The lubrication system is a pressurized, full-flow design with a
gear-type oil pump. The oil pump is mounted inside the crankcase and
driven directly from the camshaft or distributor drive gear. It draws
oil from a sump through a screened pickup tube. Oil passes through the
pump and then through a full-flow, spin-on or cartridge-style oil
filter. From the filter, pressurized oil enters the main oil gallery, a
longitudinal passage drilled through the cylinder block. The main
gallery distributes oil to the crankshaft main bearings through drilled
passages.
From the main bearings, oil travels through diagonal holes in the
crankshaft to the connecting rod bearings. A separate gallery feeds the
camshaft bearings and the mechanical lifters. Oil returns to the sump by
gravity. The system also includes a pressure relief valve that bypasses
excess oil flow back to the sump if pressure exceeds a set limit. The
oil sump is a stamped steel pan with a drain plug at its lowest point.
Oil pressure is monitored by a mechanical or electric gauge, with normal
operating pressure ranging from 25 to 45 psi at rated speed.
The cooling system is a pressurized, thermostatically controlled
liquid-cooled design. Coolant circulation is driven by a belt-driven
centrifugal water pump mounted on the front of the cylinder block. The
water pump draws coolant from the bottom tank of the radiator and forces
it into the water jacket around the wet cylinder sleeves. Coolant flows
upward around the sleeves and then into the cylinder head passages,
where it absorbs heat from the combustion chambers and exhaust valve
areas. Heated coolant then exits the cylinder head at the front, passing
through the thermostat housing.
The thermostat is a wax-pellet type, rated to open at 180°F (82°C). When
the thermostat is closed, coolant recirculates within the engine for
rapid warm-up. When open, coolant flows to the top tank of the radiator.
The radiator is a tube-and-fin cross-flow or down-flow design with
multiple rows of cooling tubes. System pressure is maintained by a
radiator cap rated for 7-10 psi (0.5-0.7 bar), which raises the boiling
point of the coolant. A coolant recovery reservoir may be present. The
system total capacity is 15.0 U.S. quarts (14.2 liters). Proper coolant
mixture consists of a 50/50 blend of ethylene glycol antifreeze and
clean, soft water.
| Governor and Exhaust Systems |
Governor System: A mechanical, gear-driven flyweight governor is
integral to engine operation. The governor housing mounts to the front
of the engine and is driven by the camshaft gear. Centrifugal weights
rotate inside the housing. Operator throttle position sets a spring
tension against the governor. Any deviation from the desired speed
changes the centrifugal force on the weights, which moves a yoke and
linkage connected directly to the carburetor throttle plate. This system
maintains stable engine speed under varying PTO and drawbar loads
without manual throttle adjustment.
Exhaust System: A single exhaust manifold, cast from iron, collects
spent gases from all four cylinders. The manifold routes exhaust upward
or to the side, connecting to a vertical exhaust stack or a muffler and
pipe system on industrial power units.
| Ignition and Electrical System |
Ignition System: The ignition system is a 12-volt, battery-and-coil,
breaker-point design with negative ground. A distributor, driven by the
camshaft, houses breaker points, a condenser, and a centrifugal advance
mechanism. Spark timing is advanced by centrifugal weights as engine
speed increases. Vacuum advance is not present on most industrial
versions. The ignition coil converts battery voltage to high-voltage
pulses, which the distributor routes to each spark plug through
high-tension wires. The firing order is 1-3-4-2. Spark plug gap is set
to 0.025 inches (0.64 mm). Breaker point gap is set to 0.020 inches
(0.51 mm). Ignition timing is set to 3° before top dead center (BTDC) at
idle, with total mechanical advance reaching approximately 28° BTDC at
governed speed.
Electrical System: The engine is equipped with a 12-volt,
negative-ground electrical system. A belt-driven alternator (or
generator on earlier units) charges the battery and supplies power to
the ignition system, lights, and accessories. A starter motor engages
with the flywheel ring gear to crank the engine. A key-operated ignition
switch controls the starter solenoid and ignition coil primary circuit.
Overall Engine Length (Front to Rear): 32.0 in (813 mm)
Overall Engine Width: 20.0 in (508 mm)
Overall Engine Height (From Oil Pan to Air Cleaner): 31.5 in (800 mm)
Dry Engine Weight (Complete, No Fluids): 500 lb (227 kg)
Weight (With Fluids and Exhaust Manifold): 535 lb (243 kg)
Engine Oil Grade: SAE 30, SAE 10W-30, or SAE 20W.
Engine Oil Capacity (With Filter): 6.0 U.S. quarts (5.7 liters).
Engine Oil Capacity (Without Filter): 5.5 U.S. quarts (5.2 liters).
Normal Engine Oil Pressure: 25-45 psi (172-310 kPa) @ rated speed.
Coolant Type: Heavy-duty diesel/antifreeze with SCA.
Cooling System Capacity: 15.0 U.S. quarts (14.2 liters).
Thermostat Opening Temperature: 180°F (82°C).
Radiator Cap Pressure Rating: 7-10 psi (0.5-0.7 bar).
Spark Plug Type: Champion H10 or equivalent.
Spark Plug Gap: 0.025 in (0.64 mm).
Breaker Points Gap: 0.020 in (0.51 mm).
Static/Idle Ignition Timing: 3° BTDC @ 500-600 rpm.
Full Mechanical Ignition Timing: 28° BTDC @ 2,400 rpm.
Intake Valve Lash (Hot): 0.014 in (0.36 mm).
Exhaust Valve Lash (Hot): 0.014 in (0.36 mm).
Valve Adjustment Interval: Check and adjust every 500 hours.
Engine Oil Change Interval: Change every 100 hours or annually.
Oil Filter Change: Replace at every oil change.
Air Cleaner: Oil-bath type. Clean bowl and replace oil every 100 hours.
Cylinder Head Bolts: 80-90 lb-ft (108-122 Nm).
Connecting Rod Cap Nuts: 45-50 lb-ft (61-68 Nm).
Main Bearing Cap Bolts: 75-85 lb-ft (102-115 Nm).
Flywheel Bolts: 55-65 lb-ft (75-88 Nm).
Crankshaft Pulley Bolt: 120-140 lb-ft (163-190 Nm).
Rocker Arm Stud Nuts: 25-30 lb-ft (34-41 Nm).
Intake/Exhaust Manifold Nuts: 25-30 lb-ft (34-41 Nm).
Oil Pan Bolts: 7-9 lb-ft (9.5-12 Nm).
Oil Pump Mounting Bolts: 15-20 lb-ft (20-27 Nm).
Valve Cover Bolts: 5-7 lb-ft (7-9.5 Nm).
Thermostat Housing Bolts: 15-20 lb-ft (20-27 Nm).
Spark Plugs: 25-30 lb-ft (34-41 Nm).
Drain Plug (Oil Pan): 25-35 lb-ft (34-47 Nm).
The International C200 engine was utilized as a primary power unit in
the following agricultural and industrial applications.
Agricultural Tractors:
International Harvester 674 (gasoline version).
International Harvester 684 (gasoline version).
Industrial Power Units:
International Harvester UC-200 stationary power unit (used for pumps,
generators, and industrial equipment).
No other widespread vehicle applications exist for the C200 designation,
though the engine block architecture shares design lineage with the
smaller C153, C157, and C175 engines used in other International
Harvester tractors such as the 444, 464, and 574 models.
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