Use corrosion-preventive procedures, in accordance with MIL-HDBK-721 on all steel parts after
inspection unless the part is to be reworked or used immediately.
Repair or replace AN standard parts (except those contained in repair kits) according to existing
Manufacturers tolerances and wear limits are given in Table 1-4 and in applicable maintenance
procedures, and should be referred to before accepting or rejecting any component for reuse.
General screw and bolt torques not specifically referred to in the text are listed in Table 1-2.
Special screw and bolt torques referred to in the text are listed in Table 1-1 and should be strictly
ENGINE ASSEMBLY REPAIR . Repair of the engine assembly is accomplished by repairing or replacing the
subassemblies in accordance with the applicable paragraphs in this chapter.
Table 9-1. General Defect Definitions
Complete separation into two or more
Fatigue, shock, or overload.
A roughened area. Can be defined as light
Foreign particles between moving parts.
to heavy, dependent upon amount of rework
necessary to restore surface.
Indentations sometimes found on surfaces of
Improper assembly or disassembly tech-
ball or roller bearing part and shaft surfaces.
nique, such as removing or installing a roller
or ball bearing by hammering on free race.
Repeated impact loads on bearings.
Bearings which do not have full constant
rotation, and are subjected to shock,
loading, have brinelling tendencies.
Injury to surfaces by excessive heat.
Improper clearance or lack of lubrication due
Evidenced by discoloration; or sometimes by
to plugged oil passages or other lubrication
flow or loss of metal.
A sharp projection or rough edge.
Excessive wear, careless handling, or im-
A rubbing action between two parts having a
Improper assembly techniques, improper fits.
limited relative motion.
Lack of lubrication.
Breaking out of small particles of metal.
Careless handling or parts. concentration or
stresses due to shock, nicks, scratches, etc.
Breakdown or pitting or surfaces by chemical
Use of improper lubricants, coolant, or fuel.
A partial failure.
Excessive stress due to shock, overloading,
or faulty processing; extension of a nick or
scratch; defective material, overheating.
Small, smoothly rounded hollow in surface.
Careless handling of parts.
Carrying away of material by the flow of hot
Blow-by; flow of corroding liquids, hot gases,
gases, grit, or chemicals.
or grit-laden oil.
Progressive damage as the stress on a piece
Originating at a surface defect or scratch.
is repeatedly applied and removed.
Breaking away of pieces of a plated, case
Incomplete bond, excessive load, or blister-
hardened, or painted surface.
ing. Excessive bearing preload.