TM-9-2815-220-34 Direct Support Manual for AVDS-1790-2C and AVDS-1790-2D Engines Download

TM 9-2815-220-34 b. Installation. NOTE The cylinder and valve rocker arm cover are machined as an assembly. The number on the rocker cover must be kept with its mating number on the cylinder to insure camshaft bearing alinement and running clearance. If rocker arm cover is damaged the entire cylinder and cover must be replaced. (1) Position valve rocker arms in rocker arm cover and insert valve rocker arm shaft (fig. 2-92) through bore in rocker arm cover and rocker arm. Use one rocker arm cover bolt (fig. 2-92) to aline hole in shaft with bolt hole in cover. Push shaft into position without twisting, to retain alinement. In- stall rocker arm shaft plugs (fig. 2-90) and valve adjusting screws (fig. 2-89). Fig11r" l-9i. I11�tnlli+g l1•e rokrr +n11s ;,, rpcker c!1er. -- .  (2) Coat face of valve rocker arm cover ith cement Mil-C-10523 (Ord). Install valve rocker arm cover being careful not to damage lip of intercylin- der sleeve (2, fig. 2-88) on each side of the cylinder. Tap valve rocker arm covet· gently into position on locating dowel pins being sure cover is flush with mating surface of cylinder. . (3) Position lip of intercylinder sleeve (2) using shim stock. (4) Secure valve rocker arm cover with four bolts and packings with retainer (6) and tighten to I 2 7 5-325 pounds inch-torque. InstalJ screw and Oat washer' (5) and tighten to 100 pounds-inch torque. Install four bolts and lockwashers (3) and tighten to 100 pounds-inch torque. (5) Make certain adjusting screw pad is posi- tioned squarely on end of valve stem. Loosen exhaust valve adjusting screw lock nut (8). Turn 2·70.6 Change 2 valve adjusting screw (9) until clearance between screw pad and valve stem is 0.025 inch (para 2-52). I Torque lock nut to 175 pounds-inch after correct adjustment is made. Make certain setting has not changed after tightening lock nut. (6) Loosen intake valve adjusting screw lock nut (10) and tu valve adjusting screw (11) until clearance between screw pad and valve stem is 0.010 inch (para 2-52). Torque lock nut to 175 I pounds-inch after correct adjustment is made. (7) Position intercylinder connector flanges on valve rocker cover and secure with two outer screws (3, lig. 2-87) and tighten the inner four con- nector flange screws (4). Install intake valve ad- justing screw access cover (7) using new gasket (8) with two bolts (5) and flat washers (6). (8) Position two air deflectors (2) between cy- linder fins and rocker arm covers and secure with two nuts (1). NOTE Use only the solid copper flat washer (gasket) Part No. 7748837 for replace- I ment whenever the fuel injector nozzle and holder assembly has been removed from the cylinder. The solid copper flat washer (gasket) conforms to the specific contours of the nozzle cylinder head seat in an indjvidual installation. Because of this, it is the only approved gasket for this function and should never be reused. Be- fore installing new gasket in cylinder nozzle seat, always check to be sure that original gasket has been removed since an inadvertent installation of two seating gaskets would damage the fuel injector nozzle retaining spring. Check to be sure cylinder nozzle seat is free from excessive carbon deposit and that the seat face is free from surface roughness. Remove carbon deposits and/or surface roughness using nozzle carbon cutter Part No. 10882949 (para 3-70). (9) Install two new preformed packings (fig. 2-86) on fuel injector nozzle holder. Install a new flat copper washer, hold in place with a light coating of grease. Install fuel injector nozzle and holder assembly, do not torque tighten until the fuel injector lines are installed. I (10) Jnstall two cylinder head shroud plates (11, fig. 2-84) and secure with four assembled washer bolts (10). Install new gasket (9) on nozzle connector bolt (8) and install bolt through nozzle connector (6). Install bolt and connector on fuel injector nozzle using new gasket (9). Install fuel return hose (7) and tighten hose nuts (5).