TM 9-6115-604-34 NAVFAC P-8-633-34 (12) 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. (13) Repair  or  replace  AN  standard  parts  (except  those  contained  in  repair  kits)  according  to  existing directives. (14) 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. (15) General screw and bolt torques not specifically referred to in the text are listed in Table 1-2. (16) Special  screw  and  bolt  torques  referred  to  in  the  text  are  listed  in  Table  1-1  and  should  be  strictly followed. 9-2. 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 TERM DEFINITION PROBABLE CAUSE Break Complete separation into two or more Fatigue, shock, or overload. pieces. Abrasion A roughened area.  Can be defined as light Foreign particles between moving parts. to heavy, dependent upon amount of rework necessary to restore surface. Broidering 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. NOTE Bearings which do not have full constant rotation, and are subjected to shock, loading, have brinelling tendencies. Burning 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. malfunction. Burr A sharp projection or rough edge. Excessive wear, careless handling, or im- proper machining. Chafing A rubbing action between two parts having a Improper assembly techniques, improper fits. limited relative motion. Lack of lubrication. Chipping Breaking out of small particles of metal. Careless handling or parts.  concentration or stresses due to shock, nicks, scratches, etc. Corrosion Breakdown or pitting or surfaces by chemical Use of improper lubricants, coolant, or fuel. action. Crack A partial failure. Excessive stress due to shock, overloading, or faulty processing; extension of a nick or scratch; defective material, overheating. Dent Small, smoothly rounded hollow in surface. Careless handling of parts. Erosion 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. Fatigue Crack Progressive damage as the stress on a piece Originating at a surface defect or scratch. is repeatedly applied and removed. Flaking Breaking away of pieces of a plated, case Incomplete bond, excessive load, or blister- hardened, or painted surface. ing.  Excessive bearing preload. 9-2