CHAPTER 3 MAINTENANCE OF COOLING SYSTEM

TM 5-6115-585-34 NAVFAC P-8-623-34 TO-35C2-3-455-2 TM-05684C/05685B-34 CHAPTER 3 MAINTENANCE OF COOLING SYSTEM Section I. DESCRIPTION AND FUNCTION 3-1. GENERAL. ator and forces it out openings near the engine. The engine air outlet uses a shutter assembly to control engine temperature. A thermostatic element controls The engine has a pressure air cooling system. Fins shutter opening which limits air flow when the engine on the engine blower draw air into the front of the is cold. When the engine air temperature reaches engine housing and force it past the cylinders and out approximately 120° F, (49” C) the shutters begin to the right side of the engine. A separate blower on the open. The shutters are completely open at 140° F generator rotor draws air into the rear of the gener- (60° C) under full rated load. Section II. MAINTENANCE 3-2. ENGINE COOLING SYSTEM. a. Inspect on equipment (see figure 3-1). On ASK equipped generators, refer to Operator and Organizational Maintenance Manual and remove cover assembly and exhaust plenum. (1) Shutter Assembly. Inspect shutter assembly (1) for physical damage. Check for debris within as- sembly. Check for smooth operation of shutters when moved manually. Check for chipped paint or rusting. (2) Bracket Assembly. Inspect that brackets (2) are securely mounted to shutters (3). Check that bracket bearings are not excessively worn. Refer to Operator and Organizational Maintenance Manual (3) Shutters. Inspect shutters (3) for physical damage and secure mounting to brackets (2). (4) Air Housing Panel and Door. Inspect air hous- ing panel and door (5) for physical damage. (5) Grille. Inspect grille (6) for secure mounting to blower housing (7). Check for physical damage. (For units without ASK.) (6) Blower Housing. Inspect blower housing (7) for physical damage. Check that blower housing is securely mounted to engine. b. Removal. Refer to Operator and Organizational Maintenance Manual. c. Disassemble. Disassemble repairable com- ponents of the cooling system per Operator and Organizational Maintenance Manual. Solvent, Dry Cleaning P-D-680, Type II is flammable and moderately toxic to skin, eyes and respiratory tract. Eye and skin protec- tion required. Good general ventilation is d. Repair. (1) Shutter Assembly. Refer to Operator and Organizational Maintenance Manual to remove and replace defective components. Repair physical damage by removing the dents, welding breaks in shutter as- sembly box. Clean repaired area with dry cleaning solvent Federal Specification P-D-680. Paint as re- quired with MIL-T-704, type A, semigloss, olive drab, color no. 24087. (2) Bracket Assemblies. Replace bracket (2) or bearings if required. (3) Shutters. Bump out dents and straighten shut- ters (3) if required. Clean with dry cleaning solvent and repaint if necessary. (4) Air Housing Panel and Door. Clean air hous- ing panel and door (5) with dry cleaning solvent and repaint if necessary. (5) Grille. Straighten any bent wires on grille (6) or weld if required to repair. (For units without ASK.) (6) Blower, Housing. Bump out dents in blower housing (7), repair cracks with welds if necessary and clean with dry cleaning solvent. Paint as required. e. Installation. Install engine cooling system. On ASK equipped generators, install cover and exhaust plenum assemblies per Operator and Organizational Maintenance Manual. 3-3. HIGH TEMPERATURE CUTOUT SWITCH. a. Remove (see figure 3-1). On ASK equipped generators, refer to Operator and Organizational Maintenance Manual and remove top panel assembly and exhaust plenum. (1) Disconnect electrical leads (10). (2) Straighten locking tab (12) and remove switch (11). normally adequate. Change 6 3 - 1