TM 10-3930-660-34 3-8. CRANKSHAFT - REPLACE/REPAIR (Cont’d) n.    Lift crankshaft (14) from cylinder block far enough to remove upper bearing halves (17) and thrust bearing (18).  Be careful that connecting rods do not scratch crankshaft. 3.    INSTALL MAIN BEARINGS (15 AND 17). CAUTION Be sure cylinder block bearing bores, backsides of bearings, and inner surface of bearing caps are clean and dry.  Oil on these areas could cause less heat transfer between the bearings and the block which, in turn, could cause overheated bearings. a. If removal was necessary, install fourteen ring dowels (16). b. Place new lower bearing halves (15) in bearing caps (13) with tab inserted in cap groove. c. At main bearing positions 1 through 5 and 7, align tab of upper bearing half (17) with groove in bearing bore (cylinder block), and press bearing half into place. d. Align tab of thrust bearing (18) with groove in cylinder block at main bearing position 6, and press thrust bearing into place. e. Apply Lubriplate 105 to the inside surfaces of the upper and lower bearing halves and thrust bearing. 3-61