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Full Power and Economy Trials, Continued - 14075_75
Compression and Firing Pressures

Engineman 1 & C - Advanced engine mechanics training manual
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CHAPTER  3 ENGINE  MAINTENANCE Keeping an internal combustion engine (diesel or  gasoline)  in  good  operating  condition  demands a  well-planned  procedure  of  periodic  inspection, adjustments,  maintenance,  and  repair.  If  inspec- tions are made regularly, many malfunctions can be detected and corrected before a serious casualty results.  A  planned  maintenance  program  will  help to prevent major casualties and the occurrence of many operating troubles. The  Maintenance  and  Material  Management (3-M)  System  provides  a  logical  and  efficient approach to many maintenance problems. It pro- duces  a  large  reservoir  of  information  about equipment disorder and indicates what corrective steps must be taken to prevent them. Another  aspect  that  must  be  considered  in connection  with  maintenance  problems  is  the safety requirement aboard ship. On some ships, the 3-M System includes safety requirement cards. A safety requirement card provides guidelines and periodicity for the inspection of selected areas not covered in the regular maintenance schedule. Complete  information  about  the  3-M  System is  contained  in  the Maintenance  and  Material Management   (3-M)   Manual,   OPNAVINST 4790.4. There may be times when service requirements will interfere with a planned maintenance pro- gram. In such event, routine maintenance must be  performed  as  soon  as  possible  after  the specified  interval  of  time  has  elapsed.  All necessary   corrective    measures   should   be accomplished as soon as possible. Repair jobs should not be allowed to accumulate, otherwise hurried and inadequate work will result. Since the Navy uses many models of internal combustion  engines,  it  is  impossible  to  specify  a detailed  overhaul  procedure  that  would  be adaptable  to  all  models.  However,  there  are several  general  rules  which  apply  to  all  engines. They  are: 1.  Detailed  repair  procedures  are  listed  in manufacturers’   instruction   manuals   and   in maintenance  pamphlets.  Study  the  appropriate manuals  and  pamphlets  before  attempting  any repair work. Pay particular attention to tolerance limits, and adjustments. 2. Observe the highest degree of cleanliness in handling engine parts during overhaul. 3. Before starting repair work, be sure that all required tools and replacements for known defective parts are available. 4.  Keep  detailed  records  of  repairs.  Such records should include the measurements of parts, hours in use, and the names of the new parts in- stalled. Analyses of such records will indicate the hours of operation that may be expected from the various engine parts. This knowledge is helpful as an aid in determining when a part should be renewed in order to avoid a failure. Since  maintenance  cards,  the  manufacturers’ maintenance manuals, and the various types of instructions discuss repair procedures in detail, this chapter will be limited to general informa- tion  on  engine  inspections,  adjustments,  and maintenance,  as  well  as  some  of  the  troubles encountered  during  overhaul,  the  causes  of  such troubles, and the methods of repair to be used. INSPECTIONS Inspections and maintenance are vital in order to  maintain  engines  (diesel  and  gasoline)  in 3-1







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