TM  10-3930-638-24&P 4-2.   ENGINE   MAINTENANCE   (cont) h. T1ming Gear Cover (cont). STEP LOCATION ITEM ACTION REMARKS INSTALLATION  (cont) 17 (cont) 18 c. Two cap screws (7) Tighten Tighten to 3542 pounds foot torque d. Thrust plate (9) Check Use feeler gauge to check running clearance between  thrust  plate  (9)  and  idler  gear Idler gear e. Lock plate (8) Bend 11) a. Cam gear Hold b. Idler gear (11) Check back- lash (11). Clearance must be 0.003 inch. If clearance is not 0.003 inch remove cap screws (7), shim(s) (10), thrust plate (9), and lock plate (8) as an assembly. Remove and measure thickness of shim(s) using micrometer. Add or remove shim(s) as necessary to obtain correct clearance. Install  shim(s),  thrust  plate,  lock  plate and  cap  screws  as  an  assembly.  Tighten cap screws to 3542 pounds foot torque Bend tabs on lock plate to lock cap screws (7) Use screwdriver Use dial indicator installed to check back- lash. Backlash shall not exceed 0.006 inch; if backlash exceeds this dimension, replace  gear  (11) Change   1   4-67