TM  10-3930-638-24&P 4-2.   ENGINE   MAINTENANCE   (cont) d. Crankshaft and Main Bearings (cont). STEP LOCATION ITEM ACTION REMARKS 10 INSPECTION (cont) e. Replacement main Remove  and Rework by removing 0.030 inch stock (cont) bearing  cap  (4, rework from mating surface. Then, bore out to 5,6, or 7) meet tolerance specified in c above. If 0.039 inch stock is removed, machine same amount from lock groove NOTE Machine new mounting surface flat so main bearing cap will set solid without wobbling in cylinder block. f. Two cap screws (3) Remove and  replacement main bearing cap (4, 5,6, or 7) INSTALLATION 11 Crankshaft  (8) a. Key (10) Position On crankshaft WARNING Wear asbestos gloves to prevent burning your hands when perform- ing following step. If you burn your hands, obtain medical aid immediately. b.  Crankshaft Heat  and Use gear and bearing heater. Timing mark gear (9) install on gear must be outward 12 Cylinder a. Bearing liner Clean Remove all dust, dirt or grease. Dirt left bore behind bearing liners will interfere with lubrication cooling resulting in hot spots and premature failure of liners 4-32