TM 5-3895-373-20 CHAPTER 3 DIESEL ENGINE MAINTENANCE Para Page General Maintenance Procedures ............................................................................. 3.1 3-1 Adjust Intake and Exhaust Valves.............................................................................. 3.2 3-2 Replace Engine Oil Filter/Cooler Assembly Components.......................................... 3.3 3-8 Replace Engine Oil Filter/Cooler Assembly Lines and Fittings.................................. 3.4 3-13 Replace Exhaust Manifold and Intake Manifold ......................................................... 3.5 3-19 3.1. GENERAL MAINTENANCE PROCEDURES. All    unit     level     maintenance     shall     be     performed     in accordance with good and safe shop practices.  Observe the following general instructions and requirements when performing diesel engine maintenance. a. Thoroughly   clean   hydraulic   hoses   and   fittings before  disconnecting.    Always  plug  or   cap   off disconnected fittings to prevent dirt and contaminants from entering the  system.   Failure to  clean  hoses  and  fittings  and  to  plug  or  cap open    fittings    may    result    in    hydraulic    system contamination and equipment damage. b. Always tag mating connectors and fittings before disconnecting.      Tagging   of   mating   connectors and   fittings   will   ease   reassembly   and   reduce assembly errors. c. Use    a    backup    wrench    when    loosening     or tightening inline fittings.  Using a backup wrench will   prevent   unnecessary   damage   to   attached lines and/or smaller fittings. d. When removing tie wraps from hoses and wiring, note  or  mark  locations  and  anchor  points.    The proper  location  and  installation  of  tie  wraps  will prevent undue chafing of hoses and wiring. e.    Thread   locking   compound   is   used   with   most threaded  fasteners.    If  a  threaded  fastener  will not  break  loose,  heat  threaded  area  of  fastener from 5000 to 600°F (232° to 3150C) with heater gun.      If   the   special   solvent   used   to   remove thread  locking   compound   from   screw   threads fails    to    remove    buildup,    discard    fastener. f. Discard  all  removed  bearings,  gaskets,  seals, preformed packings, self-locking nuts, lockwashers, spring pins, and deformed hardware. g. Inspect   all   removed   components   for   obvious wear   or   damage.      Replace   all   worn,   bent, broken, or otherwise damaged parts. h. Inspect     all     removed     fasteners     for     thread damage.    If  thread  damage  is  found,  replace fastener.  Replace flat washers if galled or bent. Use screw extractor set (Item 15, Appendix E) to remove broken studs or screws. i. Soak   gasket   seating   surfaces   with   cleaning solvent  and  scrape  with  putty  knife  to  remove leftover gasket material and residue. j. Torque values cited in the text apply to modified SAE   Grade   8   fasteners   at   required   clamping loads. k.    Use only authorized replacement parts.  Refer to TM  53895-373-24P,  Repair  Parts  and  Special Tools  List  (RPSTL)  for  authorized  replacement parts. l. Observe   all   warnings   and   cautions.      Wear protective  clothing  and  equipment  as  specified. Observe    the    Safety    and    Hazard    Warnings provided  in  TACOM  Technical  Bulletin  TB  43- 0216. 3-1