Section II 512 Change 4 TM 9-2350-267-20 GENERAL This section contains instructions on how to clean, remove and install the engine cooling system. The engine cooling system consists of the following: Engine Cooling System Engine Coolant Main and Lower Tubes (Main Tube Assembly) Surge Tank and Pressure Relief Valve Aeration  Detector Radiator and Mounts Radiator  shroud Inlet  Thermostat  and  Housing  Assembly Bypass  Thermostat  and  Housing  Assembly coolant  Pump Hoses and Tubes The maintenance procedures are given under the following headings: Engine  Coolling  System  (p  5-12) Engine Coolant Main Tube Assembly Removal (p 5-14) Engine Coolant Lower Tube Removal (p 5-15) Surge Tank Removal (p 5-16.2) Surge  Tank  Hoses  and  Fittings  Removal  (p  5-16.5) Radiator  Shroud  Removal  (p  5-18) Pressure Relief Valve and Block Mount (p 5-18.2) Aeration Detector Removal (p 5-19) Radiator  Cleaning  (p  5-20) Radiator  Replacement  (p  5-21) Radiator  MountS  Replacement  (p  5-23) Inlet  Thermostat  and  Housing  Assembly  Removal  (p  5-24) Bypass  Thermostat  and  Housing  Assembly  Removal  (p  5-26) Coolant Pump  Removal  (p 5-28) HOW arid Tubes  Removti  (p  5-29) ENGINE  COOLING  SYSTEM Component/Function LEGEND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Surge Tank Radiator Radiatm-to-surge  tank hose Engine  coolant  cross-over  tube-to-surge  tank  hose Surge tank-to-pmsum relief valve hose Pressure  relief  valve  assembly Engine coolant cross-over tube Engine  coolant  cross-over  tube-to-radiator  vent  hose Radiamr vent-to-surge tank hose Radiator fdler cap Inlet thermostat housing-to-radiator inlet hose Inlet thermostat housing Engine  coolant manifold connector housing lin~ine   coolant  manifold Comector hoses (8) Engine  coolant  main  tube  assembly Bypass thermostat housing assembly Engine coolant drain plug Engine  coolant  pump Engine coolant pump-to-oil cooler tube Surge tank-to-engine coolant pump  Uh./hose  assembly Bypass  thermostat  housing  assembly-to-engine  coolant  main  tube  assembly. tube Radiator-to-aeration  detector  hose Aeration  detector Aeration  detector-to-engine  coolant  main  tube  assembly  hose