1. Gauge blocks were installed and the cap screws were then tightened. They needed to be tightened according to a three-step tightness method, as follows: 160, 213 and 266 ft-lbs. The final torque was 256 — 276 ft-lbs and the tightness sequence was as follows:

2. The number of cap screws was 1, 2, 3, and 4 from top to bottom. The tightness sequence of step 1 was 2, 3, 1, and 4, and the torque was 160 ft-lbs.

3. The tightness of step 2 was identical to that of 2) and the torque was 213 ft-lbs.

4. The tightness of step 3 was identical to that of 2) and the torque was 266 ft-lbs.

5. The cap screws were unscrewed in the reverse sequence of the tightness sequence: 4, 1, 3, and 2.

6. One more time, the tightness was carried out by the sequence of 2), 3), and 4).

7. The remaining gauge blocks were installed on the CSB snubber lugs according to the sequence of 2), 3), 4), 5), and 6). After installation of the gauge blocks, the gaps between the upper part and the lower part were uniformly maintained at 0.1016 mm.

4.1.3 Dimensions of the CSB Snubber Lug

1. After installation of the gauge blocks, all widths of the gauge blocks at the same six intervals were measured. Subsequently, the dimensions of the CSB snubber lugs were measured. The measured parts of the CSB snubber lugs were the inside widths of both of their surfaces. In total, six holes of the CSB snubber lugs were measured.

2. The measured positions of the CSB keyway were marked and the widths measured.

3. Four dummy alignment keys (DAKs) were installed on the RV keyways and adjusted so that they could be positioned within 0.254 mm of the RV centerline. The vertical degree of an RV head seating surface of a DAK was adjusted so that it could be positioned within 0.0254 mm/ ft. The position of the DAK and the vertical degree were measured again.