AMT 1640-163-90 Mechanical Seal - Buna-N/Carbon/Ceramic Type 21

The AMT 1640-163-90 is a Mechanical Seal, Buna-N/Carbon/Ceramic, Type 21, size 1-1/8 Inch for an AMT Pump. MECHANICAL SEAL REPLACEMENT
Always replace both seal seat and seal head to ensure proper mating of components! Also, impeller seal washer should be replaced anytime impeller lock bolt has been removed. 1. Remove four bolts that connect adapter to casing . 2. Remove casing and casing seal . Care should be taken not to pinch or shave the o-ring gasket between adapter and casing. 3. Using an Allen wrench, remove impeller lock bolt, impeller seal washer,and impeller . IMPORTANT: Care should be taken to ensure that same number of shim washers are replaced behind impeller as were removed. These shim washers are located directly behind impeller. These washers as well as impeller key become loose as impeller is removed. 4. Seal head and shaft sleeve can now be pulled from shaft. 5. Pry seal seat from adapter. 6. Push seal head from shaft sleeve. INSTALLATION OF NEW SEAL The precision lapped faces on mechanical seal are easily damaged. Handle your replacement seal carefully. 1. Thoroughly clean all surfaces of seal seat cavity. 2. Using a clean cloth, wipe shaft and shaft sleeve and make certain that they are perfectly clean. 3. Wet the rubber portion of new seal seat with a light coating of soapy water. While wearing clean gloves or using a clean light rag, press seal seat squarely into adapter recess. Avoid scratching polished surface. If seal will not position properly, place a cardboard washer over polished surface and use a piece of pipe to press in, firmly but gently. 4. Dispose of cardboard washer. Check again to see that polished surface is free of dirt and all other foreign particles and that it has not been scratched or damaged. 5. Wet the inside of rubber portion of new seal head with a light coating of soapy water. Slide head onto shaft sleeve. Slide shaft sleeve with seal head onto motor shaft. Seal head and seal seat will meet. Reinstall any shims which have been removed. IMPORTANT: Before installing new shaft sleeve, apply a bead of nonhardening, pliable sealant to motor shaft shoulder. 6. Replace impeller key and impeller. Replace impeller seal washer before screwing impeller lock bolt in place. 7. Reassemble pump. 8. A short run-in period may be necessary to provide completely leak free seal operation.