Quantcast Section XIV.  CRANKSHAFT AND MAIN BEARINGS MAINTENANCE - TM-9-2815-256-24_204

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ARMY TM 9-2815-256-24 AIR FORCE TO 38G1-96-2 MARINE CORPS TM 2815-24/5 Section XIV.  CRANKSHAFT AND MAIN BEARINGS MAINTENANCE 3-43.  CRANKSHAFT AND MAIN BEARINGS. 3-43.1.  Removal. a. Check crankshaft end play, refer to paragraph 3-43.2. b. Remove oil pan, refer to paragraph 3-20.1. c. Remove oil pump, refer to paragraph 3-21.1. d. Remove rocker arm assembly, pushrods, and cam followers, refer to paragraph 3-33.1. e. Remove front plate, refer to paragraph 3-42.1. f. Remove flywheel housing, refer to paragraph 3-37.1. NOTE Leave front and rear main bearing caps installed until all of connecting rod caps have been removed. Push pistons and rods away from crankshaft. g. Remove connecting rod bearing caps, refer to paragraph 3-44.1. h. Check main bearing caps (3 and 4, FIGURE 3-137) for arrows (cast in bearing cap) and numbers stamped on cap and oil pan rail.  Arrow points toward camshaft side of engine.  If there are no numbers, stamp corresponding numbers  on  cap  and  oil  pan  rail.    This  will  assure  correct  placement  location  of  main  bearing  caps  during reassembly. i. Remove capscrews (1) and washers (2) securing main bearing caps (3 and 4); remove main bearing caps. NOTE Visually inspect condition of bearing inserts (5 and 6) as main bearing caps are removed.  Keep caps and inserts together and in correct order. j. Check bearing (5 and 6) clearances as follows: (1) Place  a  strip  of  bearing  gage  (PLASTIGAG  EPR1  )  in  the  center  of  the  main  bearing  cap  about  three fourths of width of bearing. (2) Use oil on bearing gage to prevent smearing. (3) Install cap and tighten capscrews (1) to 85 ft-lbs (115 Nm). (4) Remove cap and compare width of bearing gage with scale provided, to determine clearance.  Maximum permissible clearance is 0.006 inch (0.15 mm). 3-180


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