TM 9-2320-360-34-1 3-5.  ENGINE REPLACEMENT (CONT) (23) Install   brackets   (52)   on   engine   (20)   with two    new    lockwashers    (53)    and    screws (54). (24) Install   two   guide   screws   (55)   into   lower holes of engine (20). WARNING Air compressor weighs approximately 100 lb (45 kg). Properly support air compressor during Installation.  Failure to comply may     result     in     serious     personnel Injury. (25) Attach suitable lifting device to air compressor (56). (26) Position    air    compressor    (56)    on    guide screws (55) with aid of assistant. WARNING Sealing   compound   can   burn   easily, can  give  off  harmful  vapors,  and  are harmful   to   skin   and   clothing.      To avoid injury or death, keep away from open  fire  and  use  in  well-ventilated area.    If  sealing  compound  gets  on skin   or   clothing,   wash   immediately with soap and water. CAUTION Drive  coupling  must  be  aligned  with drive   gears   on   engine.      Failure   to comply    may    result    in    equipment damage. NOTE Air  compressor  and  mating  surfaces on   engine   must   be   clean.      Rubber seal  on  gasket  must  face  away  from engine. (26.1) Apply sealing compound to engine side of new gasket (58). (27) Install  drive  coupling  (57)  and  gasket  (58) on    air    compressor    (56)    while    assistant turns camshaft pulley (59). (28) Position   air   compressor   (56)   on   engine (20)  with  two  new  lockwashers  (60)  and screws (61) with aid of assistant. (29) Remove     two     guide     screws     (55)     and position   two   new   lockwashers   (62)   and screws  (63)  in  lower  holes  of  compressor mounting flange (64). (30) Remove lifting device from air compressor (56). (31) Tighten  four  screws  (61  and  63)  to  73-83 lb-ft (99-113 Nm). 3-56  Change 1