These include incomplete seating during the press fitting-step, distortion of the nominally circular valve seat surfaces such they deviate unacceptably from perfect roundness or waviness, tilt of the machined surfaces relative to the valve guide hole axis, deviation of the valve seat surfaces from concentricity with the valve guide holes, and deviation of the machined conical section of the valve seat from the cone angle that is required to match the valve surface.
32.
On the morning of 12 November, teams began installing a new GUCP and completed the GUCP work over the next two days . The new plate was previously fit checked on the external tank at the Michoud Assembly Facility and yielded substantially better concentricity values than was obtained with the old and removed GUCP . Technicians took extra measurements to ensure the best possible alignment of the newly installed GUCP . Teams began installing the flight seal and quick disconnect on 15 November.
33.
As the collet is forced into the tapered socket, the collet will contract, gripping the contents of the inner cylinder . ( The axial movement of cones is not mandatory, however; a split bushing squeezed radially with a linear force e . g ., set screw, solenoid, spring clamp, pneumatic or hydraulic cylinder achieves the same principle without the cones; but concentricity can only be had to the extent that the bushing's diameters are perfect for the particular object being held.
34.
The advertised February introduction of a fully synchronized, four-speed transmission RPO 651 was postponed until the 1961 model year due to casting problems with the aluminum three speed transmission case which resulted in technical service bulletins to dealers advising of potential for differential failure due to external leaks at the front of the transmission's counter gear shaft . The revision of the four speed transmission designated for 1961 introduction incorporated a cast iron case and a redesign of the differential pinion shaft to interface with a longer transmission output shaft and a concentricity pilot for the revised transmission case.
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