TM 1-1500-204-23-1 (3) All components of PS series injection type carburetor   are   self-contained   In   one   assembly.      Any difficulty   that   cannot   be   corrected   by   adjusting   idle mixture  or  speed  or  unplugging  vapor  bleed  requires replacement of carburetor. e.    Preservation.    When  carburetors  are  removed for  placement  of  storage  or  for  rework,  they  should  be preserved using the following procedures: CAUTION Exercise care to keep the preservative oil out of the air chambers  of  the  regulator  unit,  and from    contacting    the    air    metering portion  of  the  carburetor,  including the  main  venturi,  impact  tubes,  and automatic  mixture  control.    Damage to carburetor may otherwise result. (1) Remove  drain  plugs  from  bottom  of  fuel chamber on float-type carburetors and drain out all fuel. With   drain   plugs   reinstalled,   fill   float   chamber   with lubricating oil, MIL-L-6081, Grade 1010. (2) Drain   fuel   and   air   chambers   and   fuel control   unit   by   removing   drain   plugs   on   PD   and   PR series Injection-type  carburetors   Replace  plugs  to  air chambers  and  inject  lubricating  oil,  MIL-L-6081,  Grade 1010,  (under  10  to  15  psi  regulated  pressure)  until  fuel outlet  on  fuel  control  unit  shows  oil  seepage.    Remove drain plugs and allow excess oil to drain out.  Reinstall drain plugs. (3) Remove    drain    plugs    from    main    fuel chamber   on   PS   series   Injection-type   carburetors   and force  lubricating  oil,  MIL-L-6081,  Grade  1010,  into  fuel inlet  at  8  to  10  psi  until  oil  seeps  from  fuel  discharge nozzle.  Remove drain plug on bottom of main regulator assembly  and  allow  all  excess  oil  to  drain.    Reinstall drain plug. f. Installation.          Install     carburetors     using     the following procedures. (1) Remove   all   burrs   and   gasket   particles from carburetor and engine mating surfaces (2) Cover fuel lines, subject to contamination by foreign matter, with masking tape, Federal Specification PPP-T-42. (3) Place   carburetor   on   engine,   close   and secure throttle valves in closed position with lockwire. (4) Connect all lines. (5) Tighten mounting bolts in accordance with limits specified in maintenance manual. (6) Tighten  and  lockwire  all  other  nuts  and bolts. (7) Check  throttle  and  mixture  control  lever for freedom of movement; connect linkage. (8) Remove lockwire from throttle valves. (9) Ensure that vapor vent lines are free from obstructions. 7-10.      Removal   and   Installation   of   Reciprocating Engines.         Preparation   for   removal,   preparation   for installation, and installation of reciprocating engines are explained In the following paragraphs. a.    Preparation     for     Removal.          The     following preparations should be made prior to removing engines: (1)    Provide personnel with maintenance manual,   aircraft   log   book,   and,   when   applicable,   DA Form 2410. (2) Provide   proper   special   tools,   hoist,   and engine    stand    for    engine    as    given    in    maintenance manual.    Provide  ground  support  equipment  and  hand tools. (3) Provide  working  area  with  drip  pans,  fire extinguishers,  and  NO  SMOKING  signs.    Provide  oily waste    cans,    Federal    Specifications    RR-C-114,    for storage of all rags used for cleaning engine components and wiping up fuel and oil. (4) Ensure  that  aircraft  is  properly  grounded and   choked   and   battery   is   disconnected         Remove necessary cowling b. Removal.    Remove  engine  from  the  aircraft  In accordance  with  basic  instructions  given  herein  and  in the specific engine maintenance manual. (1) Preserve     engine     in     accordance     with paragraph 7-12. (2) Disconnect   all   control   rods   and   cables, magneto conduits, fuel and oil lines, thermometer tubes, tachometer shafts or wires, and like connections. 7-38