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ARMY TM 9-2815-256-24 AIR FORCE TO 38G1-96-2 MARINE CORPS TM 2815-24/5 g. Remove adapter (9) and plug (7), 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 (9, FIGURE 3-2) and plug (7) in housing (8). c. Position housing (8) and new gasket (12) on engine and secure with two capscrews (3).  Tighten screws to 35 ft- lbs (47 Nm). NOTE If required, install temperature sending unit. d. Install by-pass hose (11) on adapter (9) and water pump housing and secure with two hose clamps (10). e. Apply a thin coat of sealing compound (FORMAGASKET2) on thermostat housing (8) and cover (4). f. Position thermostat (6) in housing (8). g. Position cover (4) and new gasket (5) on housing (8) and secure with three capscrews (1 and 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. Change 3 3-23


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