Weber State University (WSU) - Automotive Technology Department - Transmission Lab. The proper measurement procedure of propeller shaft (driveshaft) U-joint phasing. Phasing means that the U-Joint bearing caps are lined up within 3 degrees of each other. Driveshafts that are out of phase can experience a second order driveshaft speed-related vibration (two shakes per revolution of the driveshaft)
Timeline
0:00 Introduction
0:10 Why driveshaft phasing is important
0:43 Front driveshaft phasing setup and tools
1:20 Actual phasing measurements on the front driveshaft (2.9 degrees and 3.0 degrees)
2:24 The phasing specification = no more than plus/minus three degrees on one driveshaft with two universal joints (u-joints)
2:50 How you can accidentally cause an out of phase problem
3:38 Rear two-piece driveline phasing
4:00 Measuring the rear u-joint phase angle = 0.2 degrees
4:34 Measuring the center u-joint phase angle = 0.7 degrees (Out of specification when compared to rear phase)
5:02 Measuring the front "Odd" u-joint phase angle = 0.4 degrees
6:00 Summary
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This video was created and edited by John D. Kelly at WSU. For a full biography, see http://www.weber.edu/automotive/J_Kelly.html
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