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TRUCK SERVICE MANUAL
TM 5-4210-230-14&P-1
GENERAL INFORMATION
Elimination of the heavy place on a crank shaft is
termed static balancing. This is accomplished by grinding off
portions of the balancing pads forged into both sides of each
throw for that purpose.
Stress
An internal force which resists the destructive action of
external force. Stresses are always accompanied by strains
and deformations There are tensile stresses, compressive
stresses, and shearing stresses. At any point on a stressed
member the stress per unit area is called the "unit stress".
Stress is the force applied, and:
Strain
Is the resulting deformation.
Specific Gravity
Is a number indicating how many times a certain
volume of material is heavier than an equal volume of water
at a temperature of 62° F. The weight of one cubic inch of
pure water at 62° F. is 0.0361 pound. If the specific gravity of
any material is known, the weight of a cubic inch of the
material can, therefore, be determined by multiplying its
specific gravity by 0.0361.
Tolerance
The range of distance between specified limits, as
applied to machine shop practice.
Torsion
That force with which a twisted part tends to return to a
state of rest.
Torque
Torque is that which produces or tends to produce
rotation or torsion; the product of tangential force multiplied by
the radius of the part it rotates. An engine is, therefore,
essentially a device for producing torque, and torque is the
energy available for producing work.
Toughness
Denotes a combination of strength and ductility,
resistance to fatigue, tension and shear.
Vapor
The gaseous form of substances which are normally in
the solid or liquid state and which can be changed to these
states by increasing pressure or decreasing the temperature.
Volatile
Readily vaporizable (examples: freon, ether, gasoline,
alcohol, L.P. gases, etc.).
CTS-2128-L Page 12
PRINTED IN UNITED STATES OF AMERICA
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