TM-9-2815-220-34 Direct Support Manual for AVDS-1790-2C and AVDS-1790-2D Engines Download
Page 186 of 532
TM 9·2815·220·34 I in figures 2-42 or 2-42.1 until valves are closed and camshaft lobes are in the posi- tion shown in figure 2-152. f'iqu1· t .JSl. Pu.9itfo11 �I n1111.�lw,li /11rs witli i11l11k om/ uhous/ ru/1•e closed. (4) Loosen exhaust valve adjusting screw lock nut (fig. 2-153). Turn valve adjusting screw until clearance between screw pad and valve stem is 0.025 inch, using thickness gage blade Part Number 10882616. Torque tighten lock nut to 175 pound-inches after correct adjustment is made. Make certain setting has not changed after tight- ening lock nut. Figure 2-153. Selling eho11Rt valve clearance. (5) Loosen intake valve adjusting screw lock nut (fig. 2-154). Turn valve adjusting screw until clearance between screw pad and valve stem is 2·96.2 Change 1 0.010 inch, using thickness gage blade part number 10882115. Torque tighten nut to 175 pound-inches after correct adjustment is made. b. Assembly. (1) Install intake valve adjusting screw access cover (7, fig. 2-151) using new gasket (8) with two bolts (5) and flat washers (6). Install exhaust valve adjusting screw access cover (3) using new gasket (4). Install support (2) and secure with self-locking bolts (1). (2) Install oil coolers, injector pump tubes, cool- ing fan shroud, engine upper covers, cooling fans and cooling fan vanes, refer to paragraph 2-27b and paragraph 2-211>. Fig11l'r -JS4. Srt1i11 i11111kr t•ufi•t' clr<1n111re. 2-53. 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. 2-155) with tim- ing marks "6R INT CLOSE 0.100 CLR" for timing the right camshaft with the crankshaft, and makred "6L INT CLOSE 0.100 CLR" for timing the left camshaft with the crankshaft. For instruc- tional purposes the timing of the right camshaft is described. Right and left camshaft timing is iden- tical. b. Disassembly. Remove three capscrews (fig. 2-156), and remove timing access cover. Remove two bolts and flat washers attaching intake valve adjusting screw access cover. Remove cover and gasket. Discard gasket. c. Positioning Camsht. (1) Turn crankshaft. on Model AVDS-1790-2C and AVDS-1790-20 engines using splined wrench as shown in figure 2-42. (1.1) Tu crankshaft on Model A VDS-1790- 2DR engine using improvised turning tool as shown in figure 2-42.1. (2) Loosen timing adjusting screw lock nut (fig.