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Model T Ford Engine Explained In Detail
The
Ford motive power is derived from what is known as an L block,
four-cycle and four-cylinder, poppet valve motor (or engine). Its
stationary parts are, (1) the cylinders, (2) the crank case. The
working parts are, (1) the pistons, (2) the connecting rods, (3) the
crank shaft, (4) the flywheel, (5) the valves, cam shaft and time gears.
The
word “cycle” as it is applied to a gas motor refers to a series of
events which are repeated in regular order—and applies to the ideal
type of automobile motor. In the Ford motor, four operations are
required to complete the series. These operations are, (1) suction, (2)
compression, (3) explosion, (4) exhaust. These are
repeated in regular order in each of the four cylinders. The piston
moves downward during the explosion and intake strokes; it moves upward
during the compression and again during the exhaust. The piston
receives an impulse (i. e., force of an explosion) once in every two
revolutions.
On
the downward stroke the suction of the piston draws the fresh gas from
the carburetor, through the inlet pipe and valve, into the cylinder.
The upward movement of the piston compresses the gas into a very small
space, between the top of the piston and the depression in the cylinder
head, known as the “combustion chamber.” (The compressed gases exert a
pressure of approximately 60 pounds per square inch.) At this point the
electric spark, generated by the magneto, explodes the gases—driving
the piston downward—thus
producing the power which turns the crank shaft. On the next stroke
upward the piston drives the exploded gas out through the exhaust valve
and pipe to the muffler. The accompanying cut shows clearly the
relative positions of the pistons and valves during the different
strokes.
The Cooling System
The Cooling System of
the Model T motor is known as the Thermo-Syphon or Gravity system, and
acts on the principle that hot water seeks a higher level than cold
water, consequently when the water reaches a certain

heat, approximately 180 degrees, circulation commences and the
water
flows from the lower radiator outlet pipe up through the water jackets
into the upper radiator water tank, and down through the tubes to the
lower tank to repeat the process. During the time that it is passing
from the upper to the lower radiator tank it becomes cooled by the air
which comes in contact with the fins and tubes of the radiator and
which is sucked in by the fan. The rapidity of circulation is governed
by the heat of the motor, and not by the speed.
The Ignition System
The
source from which the ignition current is obtained is a low tension
magneto of the inductor type, which contains but two parts, a
stationary armature consisting of a number of coils, which are attached
to the cylinder casting, and a set of permanent field magnets of the
horseshoe type, which are secured to the flywheel, the whole being
incorporated in and a part of the motor. The magnets revolve with the
flywheel at a distance of 1/32” from the coils, which collect the
current from the magnetic field and shunt it into the spark coil, where
it is transformed from low to high tension, and sent to the spark plugs
to perform its function of igniting the charge.
The
commutator (or timer) , as shown on the right illustration, determines
the instant at which the spark plugs must fire. It effects the “make
and break” in the primary circuit. The grounded wire in the magneto
allows the current to flow through the metal parts to the metal roller
in the commutator. Therefore, when the commutator roller in revolving
touches the four commutator contact points, to each of which is
attached a wire connected with a coil unit, an electrical circuit is
passed through the entire system of primary wires. This circuit is only
momentary, however, as the roller passes over the contact point very
rapidly and sets up the circuit in each unit as the roller touches the
contact point connected with that unit. The commutator should be kept
clean and well oiled at all times.
The Gasoline System
The
illustration above sows the intake and exhaust manifolds.
Attached to the intake manifold is the carburetor. The carburetor is
the device in which the gasoline and air are combined into a vapor or
mixture” in proper proportions to form the “charge,” which is sucked
into the engine and there exploded by an electric spark. The carburetor
is so constructed as to allow for the varying of the proportions of the
air and gasoline, to meet conditions. These proportions are usually
about one part gasoline to twelve or fourteen parts air—although the
proportion varies according to the conditions of the atmosphere, the
speed of the car and the quality of the gasoline.
The carburetor
is of the automatic float feed type, having but one adjustment—the
gasoline needle valve. The cross section diagram of carburetor (Cut No.
14) is not a detail drawing but simply shows how the gasoline enters
the carburetor, is vaporized by a current of air, and passes through
the inlet pipe to the engine in the form of an explosive mixture. The
gasoline, entering the bowl of the carburetor, gradually raises the
float to a point where the inlet needle lowers into its seat, thus
cutting off the flow of gasoline. As the gasoline in the bowl recedes,
the float lowers and lifts the needle from its seat and the flow of
gasoline is resumed. It is plain to see that a constant level of
gasoline is maintained in the carburetor by the automatic action of
float and needle. The quantity of gasoline entering into the mixture is
governed by the needle valve. The volume of gas mixture entering the
intake pipe is controlled by opening and closing the throttle’
according to the speed desired by the driver.
The Model T Ford Transmission
The
Ford Model T transmission is of the planetary type. A planetary
transmission uses groups of gears that always remain in mesh
and
revolve around a main axis. The different sets of gears are brought
into action by stopping the revolution of the parts which support the
gears. By means of bands (similar to brake bands) the rotation of the
different parts is stopped.

The
clutch is controlled by the left pedal at the driver’s feet (see
below). If the clutch pedal, when pushed forward into slow speed, has a
tendency to stick and not to come back readily into high, tighten up
the slow speed band. Should the machine have an inclination to creep
forward when cranking, it indicates that the clutch lever screw which
bears on the clutch lever cam has worn, and requires an extra turn to
hold the clutch in neutral position.

The Ford Model T Front and Rear Axles
The illustration to the right shows the
Ford Model T front axle and spindle bodies.
The wheel hubs are placed onto the spindle ends along with bearings.
The
rear axle uses a "3-point drive" system, unique to Ford. This type
of construction necessitates the use of only a single
universal
joint and permits of the housing of the entire driving mechanism in a
dust proof, oil tight case. If plenty of oil is supplied to these parts
there should be no trouble during the natural life of the gears, made
as they are of the best special alloy steel obtainable, carefully cut
and case hardened.
The
rear axle runs on Hyatt roller bearings. End thrust tendencies of the
large bevel gear are taken by fiber discs between hardened and ground
steel discs—the best possible construction for this service. The
propeller shaft runs in babbitt bearings at both ends. The entire axle
is lubricated by a copper tube which leads from the oiler and enters
at the ball joint. The oil flows down through the tubular torsion tube
to the gears and finally to the Hyatt roller axle-bearings. These
bearings are spiral rollers and each alternate spiral is reversed so
that they distribute the oil
automatically over all parts of the bearing surface. Dope cups are
installed on each drive shaft bearing and the four rear axle bearings
to assist lubrication, as dope will be retained longer and therefore
gives better results than oil. Note: The rear hub brakes are
intended to perform the function of emergency brakes as their name
implies and consequently they take hold severely. Used only in
emergency they should outlive the rest of the car. Many theories to the
contrary notwithstanding, the transmission brake is not injurious to
the driving gears if used judiciously, as every other part of the car
should be used. And inasmuch as this brake equalizes the forces between
the two rear wheels uniformly, is more easily lubricated, inspected and
adjusted, it is better practice to use it for service than the hub
brakes.
U.S. Ford Model T Engine Serial Numbers
The following table shows engine serial numbers for the Ford
Model T, gleaned from production records at the Ford Motor Company.
These numbers represent calendar year production, not model year.