TM-9-2815-220-34 Direct Support Manual for AVDS-1790-2C and AVDS-1790-2D Engines Download
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TM 9-2815-220-34 3·188. Cooling Fan Shrouds, Upper Covers, Cooling Fans and Vanes CAUTION Do not run engine above idle and not longer than ten minutes without cooling fans. NOTE The fuel injection pump, fuel tubes, and fuel tube connections must be checked for fuel leaks with the engine running before the coolin� fans are installed. a. Install a fan rotor hub sleeve spacer part number l0882651 (fig. 3-336) on each fan drive ver- tical drive shaft to prevent oil seepage at fan ddve oil seals while operating engines. Secure the sleeve spacer to each drive shaft with the same nut used to secure the cooling fan. Start engine and check for fuel leaks. If leaks are evident, loosen the tube fittings and retighten. f"igurc 3·.6. Fru11t fl111 tl1fre ho11sing111 rotor hub s/CCl'I' S/IUCl'I" i11.�tollcdftlJ· lt111kage (CIJI. 3-242.2 Change 3 NOTE NEVER OVERTIGHTEN when attempt- ing to remedy a fuel leak. Overtightening will deform the sleeve and eventually lead to tube failure. It is permissible to loosen the nut, or titting, and retighten. This procedure will, in many cases, seal the fuel leak. The loosening and tightening operation tends to reseat the sleeve, thus providing an effective seal. Rep Ince tubes rather than overtighten to stop leaks. b. Install cooling fan shroud and fan housing as an assembly on top frame retaining brackets. Se- cure left and right center shroud, left and right rear shroud, and two fuel return line clamps to cooling fan shroud with three assembled washer bolts (2, fig. 3-9). Install four assembled washer bolts, flat washers and hexagon nuts (1), securing rear sh1·oud and cylinder head fuel return tube clamps to rear shroud. b.J. Install cooling fan shroud and fan housing as an assembly on top frame retaining brackets. Secure left and right center shroud, left and right rear shroud, and two fuel retu line clamps to cooling fan shroud with three assembled washer bolts (2, ftg. 3-9.1) and self-locking nuts (not shown). install four assembled washer bolts and self-locking nuts (I), securing rear shroud and cylinder head fuel retu tube damps (not shown) to inside or rear shroud. b.2. Secure cooling fan shroud anu oil cooler vent line clamps lo left and right front shrouds with five assembled washer boJls (fig. 3-8). c. Install rear cooling fan and hub assembly (fig. 3-7) nnd v erLical drive shnft :111cl secure with Oat washer and slotted nut. Torque tighten slotted nut to 600 pound-inches and secure with new cotter pin. Install front cooling f an and hub assembly in the same manner. ) )