Note. Intake and exhaust valves must not be machined. Only lapping is permitted.
Scheme 317
Scheme 318
| WARNING | Sodium-filled exhaust valves must not be scrapped without first being properly treated. Using a metal saw, the valves must be cut in half between the shaft center and valve plate. They must not come into contact with water while being cut. After cutting open valves, throw not more than 10 at a time into a bucket of water. Then step back. A sudden chemical reaction will occur during which the sodium filling is consumed. Valves that have been treated in this manner can then be disposed of as normal scrap metal. |