Carrier 17/19EX - Manual (Page 211)

Measurement — Occasionally, coupling faces may not be perfectly true, or may have been
damaged in handling. To compensate for any such runout, determine the actual or ‘‘net’’ shaft
misalignment as follows:
Check the opening at the top and at the bottom of the coupling faces (or at each side when
making plan adjustment). Rotate both shafts exactly 180 degrees and recheck the openings.
Record the difference. (Example below is in inches.)
If the larger opening remains the same but changes from side to side, the shafts are in
perfect alignment. The change in opening is due entirely to coupling runout, as above,
Click here for Figure 39 — Measuring Angular Misalignment on Brackets