A.O. Smith 186589-004 - Manual (Page 24)

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Before removing the anode: 1) the tank water should be cool, 2)
the cold water shut off valve must be closed, and 3) water pres-
sure must be relieved by opening a nearby faucet.
DRAIN VALVE WASHER REPLACEMENT
(See Figure 29)
1. Turn “OFF” gas supply to water heater.
2. Follow “Draining” instructions.
3. Turning counterclockwise ( ), remove the hex cap below
the screw handle.
4. Remove the washer and put the new one in place.
5. Screw the handle and cap assembly back into the drain
valve and retighten using a wrench. DO NOT OVER TIGHT-
EN.
6. Follow instructions in the “Filling The Water Heater” section.
7. Check for leaks.
8. Follow the lighting instructions in the “Lighting” section to
restart the water heater.
FIGURE 29