TM 5-3805-260-24 2. Make   sure   the   coolant   is   over   the   top   of   the radiator core. 3. Put   the   9S8140   Cooling   System   Pressurizing Pump Group on the radiator. 4.Get the pressure reading on the gauge to (20 kPa) more than the pressure on the pressure cap. 5. Check the radiator for outside leakage. 6. Check all connections and hoses for the cooling system for outside leakage. 7. If   you   do   not   see   any   outside   leakage   and pressure reading on the gauge is still the same after 5 minutes, the radiator and cooling system does not have leakage.  If the reading on gauge goes    down    and    you    do    not    see    any    side leakage,      there   is   leakage   on   the   inside   the cooling system.  Make repairs as necessary The   9S8140   Cooling   System   Pressurizing   Pump Group is used to test  pressure  caps  and  pressure  relief valves,    and  to  pressure  check  the  cooling  system  for leaks. Gauge for Water Temperature Tools Needed: 9S9102 Thermistor Thermometer Group. If the engine gets too hot and a’ loss of coolant is a problem,    a  pressure  loss  in  the  cooling  system  can  be the  cause.    If  the  gauge  for  water  temperature  shows that   the   engine   is   getting   too   hot,      look   for   coolant leakage. If   a   place   can   not   be   found   where   there   is   coolant leakage,    check  the  accuracy  of  the  gauge  for   water temperature.  Use the 9S9102 Thermistor Thermometer Group. WARNING To help prevent an accident caused by parts in rotation, work carefully on an engine that has been started. Start   the   engine.      Put   a   cover   over   part   of   the radiator.          The     reading     on     the     gauge     for     water temperature    must    be    the    same    as    the    reading    on thermistor thermometer. 9S9102 THERMISTOR THERMOMETER GROUP INSTALLED (Typical Example) Temperature Regulator Test procedure for water temperature regulators: I. Remove the regulator from the engine. 2. Put heat to a pan of water.  Get the temperature of the water to 1970 F (920 C). 3. Hang the regulator in the pan of hot water.  Put the regulator completely under the water.  Do not let the regulator make contact the pan. 4. Keep the temperature of the water at 197F (92 C)   for   ten   minutes.      Make   the   water   move around.      This   keeps   all   of   the   water   at   the temperature. 5. After   ten   minutes,      remove   the   regulator   and immediately  measure  the  distance  the  regulator is  opened.    See  the  SPECIFICATIONS  for  the correct opening distance. WATER PUMP PRESSURE CHECK Tools Needed: 9S8138 Pressure Gauge. 3B7722 Bushing. The pressure at the outlet for the water pump tells if the    shunt    system    and    water    pump    are    operating correctly.    To  check  the  pump  pressure  install  pressure gauge  (2)  in  the  front  cover.    The  pressure  must  be  a minimum of 15 psi (105 kPa) at 2800 rpm. If   the   pump   pressure   is   less   than   the   minimum pressure:  First, check the vent tube between radiator top tank  and  the  surge  tank;  it  must  an  inside  diameter  of approximately .19 in 4.8mm). Second   check   to   see   that   the   shunt   line   has   a minimum inside diameter of .75 in.  (19.1 mm). 2-71