T&D Machine Products TFS 302 - Manual (Page 2)

If the gage contacts the shaft before touching the top of the valve stem, as shown in Figure 2,
remove a corresponding amount of material from the stud bosses on the cylinder head. This will
lower the rocker stand on the cylinder head
If the gage contacts the top of the valve stem and does not touch the rocker shaft, as shown in
Figure 3, add a corresponding amount of shims between the stand and the cylinder head. This will
raise the rocker stand and shaft to the correct height.
2. DETERMINE CORRECT PUSHROD LENGTH
Place the pushrod length checker into the lifter and install the rocker arm assembly. Be sure the
cam is rotated to the base circle. Seat the bottom of the adjuster screw up against the recess in
the rocker arm and turn the adjuster screw clockwise on full turn down. This is the initial adjuster
position. Adjust the pushrod length tool to the proper length, remove from the engine, and
measure its overall length.
The rocker arm should not be operated with the adjuster screw more than one turn up or down,
from the initial adjuster position. Doing so can cut off the flow of oil to the rocker arm.