TM-9-2815-200-35 Maintenance Manual for AVDS-1790-2M AVDS-1790-2A and AVDS-1790-2AM Engines Download
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Note. Before checking or adjusting exhaust valve clearance (fig. 4-188) and intake valve clearance (fig. 4-189), make sure both valves are closed on cylinder being checked. Turn engine as shown in figure 4-51 until valves are closed and camshaft lobes are in position shown in figure 4- 73. 1. Loosen exhaust valve adjusting screw lock nut (A). 2. Turn valve adjusting screw (B) until clearance be- tween screw pad and valve stem is 0.025 inch. Torque lock nut to 175 pounds inch after correct adjustment is made. Make certain setting has not changed after tightening lock nut. Figure 4-188. Setting exhaust valve clearance using thickness gage blade-5210-793-7899. 4-24. Checking Intake and Exhaust Valve Timing a. General. Valve timing is checked with cylinder No. 6R and 6L intake valve clearance set at 0.100 inch. The flywheel is stamped (fig. 4-190) with timing marks “6R INT CLOSE 0.100 CLR” for timing the right camshaft with the crankshaft, and is also marked with timing marks “6L INT CLOSE 0.100 CLR” for timing left. For instructional purposes the timing of the right camshaft is described. Right and left camshaft timing is identical. Refer to Table 4-9 for instructions pertinent to this operation. Figure 4-190. Flywheel timing mark locations. 1. Loosen intake valve adjusting screw lock nut (A). 2. Turn valve adjusting screw (B) until clearance be- tween screw pad and valve stem is 0.010 inch. Torque lock nut to 175 pounds inch after correct adjustment is made. Figure 4-189. Setting intake valve clearance using thickness gage blade-5210-793-7898. 4-98