TM 10-3930-659-20 5-34. ENGINE THERMOSTAT AND HOUSING MAINTENANCE. This Task Covers: a. Engine Thermostat Replacement c. Engine Thermostat Housing Installation b. Engine Thermostat Housing Removal Initial Setup: Equipment Conditions: Materials/Parts: • Engine cool. •  Two gaskets • Conveyorized fork attachments removed from side of • Two preformed packings forklift truck (see paragraph 17-13). •  Five lockwashers • Right engine upper sideshield opened (see TM 10- 3930-659-10). References: • Engine  cooling  system  drained  (see  para- graph 5-38). •  TM 10-3930-659-10 Tools/Test Equipment: General Safety Instructions: • General mechanic's tool kit (Item 44, Appendix F) •  DO NOT perform engine cooling system mainte- • Torque wrench, 0-175 lb. -ft.  (Item 52, Appendix F) nance unless engine is cold. a. ENGINE THERMOSTAT REPLACEMENT WARNING Servicing of engine cooling system should only be performed on a cool engine. NEVER remove clamps or hoses when engine Is hot.  Pressurized steam, hot water, or coolant will cause serious burns. 1. Loosen clamp (11) and remove upper engine radiator hose (1) from engine thermostat housing cover (10). 2. Remove   screw   (5),   lockwasher   (4),   and   clamp   (6)   from   engine   thermostat   housing   cover   (10).      Discard lockwasher. 3. Remove  two  screws  (3),  lockwashers  (2),  engine  thermostat  housing  cover  (10),  and  gasket  (8)  from  engine thermostat housing (7).  Discard lockwashers and gasket. NOTE Note position of thermostats to aid during Installation. 4. Remove two engine thermostats (9) from engine thermostat housing (7). 5. Install two engine thermostats (9) in engine thermostat housing (7). 5-96