TM-9-2815-200-35 Maintenance Manual for AVDS-1790-2M AVDS-1790-2A and AVDS-1790-2AM Engines Download
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1. Slowly turn camshaft (A) clockwise, as viewed from flywheel end, until No. 6R intake valve has just closed. 2. Closing point is determined by trying to rotate the swivel pad (B) on the intake valve adjusting screw while the camshaft is being rotated. The valve is closed the in- stant the swivel pad is free to move. Figure 7-24. Determining closing point of No. 6 intake valve. Note. Do not force camshaft drive shaft. The shaft is machined with a 24-tooth spline on inner end, and a 28-tooth spline on outer end. This difference in number of teeth provides a vernier effect which makes it possible to index the drive shaft so it will engage the splines of the camshaft drive gearshaft and camshaft drive bevel gearshaft at some point within 360 degrees. An accurate setting is then provided without changing the relationship of the camshaft and crankshaft. 1. Maintain the position of camshaft as set in figure 7-24 and the crankshaft position set in figure 7-21. 2. Insert camshaft drive shaft (A), using mechanical puller-5120-678-5282, and mate splines on drive shaft with splines in camshaft drive bevel gearshaft. When splines of drive shaft do not mate with splines of camshaft gearshaft, withdraw drive shaft and turn slightly before again attempting insertion. Note. It may be necessary to repeat this operation a number of times before splines will mate and allow drive shaft to be inserted into position. Figure 7-25. Installing camshaft drive shaft. 7-19