Visually inspect valve stem and seat surfaces for signs of wear. If there are clear signs of wear, replace the valves.
| WARNING | Sodium-filled exhaust valves must not be scrapped without first being properly treated. The valves must be cut open with a hacksaw between the middle of the stem and the valve head. The valves must not come into any contact with water when being cut. After preparing the valves in this way, throw not more than 10 at a time into a bucket of water. Step back after doing this as a sudden chemical reaction will occur during which the sodium filling is burned. Valves that have been treated in this way can then be disposed of as normal waste. |