8.1.3 Loosen the locknut (nearest the free end of the threaded valve stem) a few turns to separate it
from the spring-adjusting nut.
Figure 8-3 Loosen Locknut
8.1.4 Using a manual or an air-operated press, invert the valve to compress the spring and relieve
pressure from the spring-adjusting nut. Use a tubular yoke (Figure 8-1) that is partially cut away
to press down on the spring follower, further compressing the spring.
Figure 8-4 Compress Valve Spring