TM5-6115-593-34 NAVFAC P-8-631-34 TO-35C2-3-463-2 CHAPTER 7 MAINTENANCE OF RADIATOR ASSEMBLY 7-1.    GENERAL.    The  radiator  assembly  consists  of  a radiator core with removable tanks, fan, and fan motor. The fan is enclosed by a guard and located in a shroud attached to the radiator.  An electric motor drives the fan via  belts  and  sheaves  (Code.    A)  or  directly  (Code  B); see  note  below  for  explanation  of  codes.    The  radiator system  cools  the  engine,  lubricating  oil  cooler,  and  the intercooler.          It     reduces     engine     temperature     and maintains  coolant  temperature  at  125F  (52C)  when generator  set  is  operated  at  continuous  loads.    When the housing kit is installed, a thermostatically controlled shutter assembly controls airflow to radiator by means of movable shutters. NOTE The   radiator   installation   on   earlier units  (serial  numbers  FZ00001  thru FZ00064)    differs    from    later    units (serial numbers FZ09100 thru FZ09150), therefore the former in the following discussion is referred to as Code A and the latter as Code B. 7-2.  TEST. a. Preliminary.    Preliminary  inspections  consist  of checking for leaks (especially at hose connections), and coolant level may be checked at the sight glass.  If coolant level is below sight glass,  remove  radiator  cap  and  check  level  in upper tank. WARNING WHENEVER  GENERATOR  SET  HAS JUST  BEEN  SHUT  DOWN,  REMOVE RADIATOR CAP SLOWLY TO ALLOW PRESSURE    TO    ESCAPE    BEFORE REMOVING CAP. Refill radiator with proper coolant to approximately   2   inches   (50   mm)   below   filler neck   level.      Using   a   hydrometer,   verify   that antifreeze is in accordance with table 3-1 in the Operator/Crew and Organizational Maintenance manual, TM5-615-593-12. b. Radiator    Core    Test.        Remove    radiator    in accordance with instructions in paragraph 7-3 or 7-7. Test  the  radiator  for  leaks  by  placing  the  radiator, with all outlet connections sealed, in a tank of water. Apply   compressed   air   at   10   to   15   psi   (0.7   to   1 kg/cm²)  at  filler  opening  and  observe  for  leakage indicated   by   air   bubbles   in   the   water.      Repair   if necessary. 7-3.  RADIATOR REPLACEMENT, CODE A .  Remove and replace radiator assembly as follows: a. Removal. (1) If  generator  set  has  a  housing  kit  installed, remove    panels    and    shutter    assembly    in accordance with Chapter 15.  (See figure 7-1) (2) Drain  coolant  from  radiator,  remove  clamps (26,  22,  29,  32,  6,  7  and  13)  and  disconnect hoses (27, 25, 33, 16, 8, and 12). (3) Tag   and   disconnect   electrical   leads   to   fan motor (64). (4) Remove  belt  guard  (58)  by  removing  screws (55), nuts (57), and washers (56). (5) Loosen adjusting screw on motor mount base (65)  and  slide  base  slightly  together  with  fan motor (64) to loosen belts (59). (6) Remove belts (59). (7) Remove   screws   (47),   washers   (48   and   49) and  nuts  (50),  that  secure  radiator  assembly to skid base. (8) Remove both support tubes (41). 7-1