AMT 1641-166-91 Mechanical Seal - Viton/Silicon Carbide Type 16

The AMT 1641-166-91 is a Mechanical Seal, Viton/Silicon Carbide, Type 16, size 3/4 Inch for an AMT Pump. MECHANICAL SEAL REPLACEMENT
Always replace seal seat, , seal head , and shaft sleeve to ensure proper mating of mechanical seal components! 1. Unthread fasteners and remove casing , O-ring and flapper valve from adapter . 2. Unthread fasteners and remove volute from adapter. 3. Unscrew impeller from shaft. Use a rubber mallet or soft block of wood to loosen impeller. Turn it counterclockwise. Remove impeller shim , shaft sleeve and seal head from shaft. Remove wear-plate from adapter. NOTE: To keep shaft from turning on engine driven units, remove shroud from engine and hold flywheel in place. 4. Unthread fasteners and remove adapter from mounting face. 5. Push seal seat from adapter recess with a screwdriver. 6. Clean adapter recess before inserting a new seal seat. 7. Carefully wipe seal face of new seal seat with a clean cloth. 8. Wet outside of rubber portion of seal seat with a light coating of soapy water. 9. Press new seal seat squarely into cavity in adapter. Use finger pressure only to avoid scratching seal seat. 10. After seal seat is in place, be sure that it is clean and has not been marred. 11. Using a clean cloth, wipe shaft and make certain that it is perfectly clean. 12. Secure adapter on mounting face. Tighten fasteners EVENLY to avoid cocking rabbet on mounting face. 13. Apply a light coating of soapy water to inside rubber portion of seal head and slide onto shaft sleeve. Slip shaft sleeve with seal head onto shaft with sealing face toward polished sealing surface of seal seat. Do not touch or wipe sealing face of seal head. 14. Replace any impeller shim removed in disassembly. 15. Screw impeller back in place, tightening until it is seated against shims and shaft sleeve. 16. Install wearplate into rabbet in Specifications Information and Repair Parts Manual adapter aligning fastener holes in adapter with clearance holes in wearplate. Remount volute with fasteners. NOTE: Do not over tighten fasteners. Fasteners should be snug to eliminate play between adapter, wearplate, and volute. Pressure developed from mounting casing to adapter will fix volute and wearplate into position. 17. Refer to section entitled SHIM ADJUSTMENT at this time if shaft sleeve or any other parts listed therein have been replaced. 18. Inspect position of flapper valve to ensure proper movement and seating. 19. Position O-ring on volute. NOTE: Always inspect O-ring seal. Replace when cracked or worn. Wet O-ring with soapy water for ease of assembly. 20. Remount casing.