ARMY TM 9-2815-252-24 AIR FORCE TO 38G1-92-2 3-33.3.   Installation. a. Install new bearing in gear end of crankcase, refer to paragraph 3-34.4.. b. Position new center bearing shells (14, FIGURE 3-40) on upper and lower housing.  Install upper  housing  (12) and lower housing (13) ensuring words FLYWHEEL END are facing flywheel end of crankshaft (10).  Secure with two capscrews (11) and tighten to 186 in-lbs (21.0 Nm). c. Install crankshaft (10) Into crankcase from flywheel end.  Ensure that center bearing locating tube hole is aligned with hole in crankcase. d. Apply a small amount of general purpose grease (630AA) to steel side of thrust bearings (16) and place them in gear end of crankcase with tab correctly located and copper face toward crankshaft (10). TABLE 3-7.  Crankshaft Component Wear Limits Component Initial Dimension Maximum Clearance inches (mm) inches (mm) Flywheel end main 2.915 (74.040) bearing housing bore 2.916 (74.065) Bearing shell thickness 0.0783 (1.990) 0.0055 (0.14) 0.0787 (2.000) Crankshaft journal 2.755 (69.985) diameter 2.756 (70.000) Gear end main bearing 2.305 (58.535) housing bore 2.306 (58.560) Bearing shell thickness 0.0685 (1.740) 0.0689 (1.750) 0.053 (0.135) Crankshaft journal 2.1648 (54.985) diameter 2.1654 (55.000) Center main bearing 2.305 (58.535) housing bore 2.306 (58.560) Bearing shell thickness 0.0685 (1.740) 0.053 (0.135) 0.0689 (1.750) Crankshaft journal 2.1648 (54.985) diameter 2.1654 (55.000) Thrust bearing thickness 0.091 (2.310) (See Note) 0.093 (2.360) NOTE Replace thrust bearing if thickness is less than 0.0394 in.  (2.20 mm). CAUTION Take special care when passing crankshaft (10) through gear end bearing as it is quite easy to score bearing shell with crankshaft. 3-78