ARMY TM 9-2815-255-24 AIR FORCE TO 38G1-95-2 MARINE CORPS TM 2815-24/4 g. Remove adapter (11) if replacing housing (8). h. Cover all openings to prevent entry of foreign material. 3-9.2.  Inspection. a. Inspect thermostat for excessive wear or damage. b. Inspect housing for cracks, corrosion, or other damage. 3-9.3.  Replacement. NOTE If thermostat is suspected of being defective, replace thermostat. a. Replace thermostat if worn or damaged. b. Replace housing if badly corroded or damaged. 3-9.4.  Installation. NOTE Remove all covers. a. Ensure all old gasket material is removed from gasket surfaces. b. Install adapter (11, FIGURE 3-2) in housing (8). c. Position housing (8) and new gasket (12) on engine and secure with two capscrews (6) and new lockwashers (7). Tighten screws to 35 ft-lbs (47 Nm). NOTE If required, install temperature sending unit. d. Install by-pass hose (10) on adapter (11) and water pump housing and secure with two hose clamps (9). e. Apply a thin coat of sealing compound (FORMAGASKET2) on thermostat housing (8) and cover (3). f. Position thermostat (5) in housing (8). g. Position cover (3) and new gasket (4) on housing (8) and secure with capscrews (1) and new lockwashers (2). Tighten screws to 20 ft-lbs (27 Nm). h. Install outlet hose and secure with hose clamp. NOTE Air must be expelled from system when refilled with coolant.  Loosen temperature sending unit fitting at rear of cylinder head or plug in thermostat housing to allow air to escape when filling system.  Retighten fitting or plug when all the air has been expelled. i. Service coolant system, refer to end item maintenance manual. 3-23