Quantcast FIGURE 3-139.  Measuring Main Thrust Journal and Thrust Bearing Width

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ARMY TM 9-2815-256-24 AIR FORCE TO 38G1-962 MARINE CORPS TM 2815-24/5 (4) Measure width of thrust bearing using an outside micrometer. FIGURE 3-139.  Measuring Main Thrust Journal and Thrust Bearing Width (5) New main thrust bearing width (standard size) is 1.528 to 1.530 inches (38.80 to 38.85 mm) (6) New main thrust bearing clearance (thrust journal width minus thrust bearing width) is 0.002 to 0.008 inch (0.05 to 0.20 mm). (7) Maximum allowable thrust bearing clearance is 0.015 inch (0.38 mm).  Oversize thrust washer sets have thrust washers that are 0.007 inch (0.18 mm) oversize. f. Measure assembled ID of main bearing caps as follows: (1) Remove bearing inserts from caps and engine block.  Keep inserts in correct order if they are to be reused. (2) Clean caps in solvent and dry with compressed air. (3) Inspect caps for serviceability.  Small burrs or nicks on flat surfaces may be removed with a file.  Use a medium-grit polishing cloth to dress up curved bearing surfaces. (4) Install bearing caps in engine block.  Tighten capscrews to 85 ft-lbs (115 Nm). (5) Measure  ID  of  bore  without  bearings.    Main  bearing  bore  ID  without  bearings  should  be  3.325  to  3.326 inches (84.45 to 84.48 mm). (6) If bearing caps are damaged or bore is not within specification, replace cap and bore to specification. CAUTION Main bearing cap line boring should be done only by experienced personnel on equipment capable of maintaining the bore specifications.  Make sure that dimension from centerline of core-to-top deck of engine block does not exceed 11.889 to 11.894 inches (301.98 to 302.11 mm) NOTE Replacement bearing caps are supplied with bearing bore unfinished. g. Inspect piston cooling orifices as follows: (1) Inspect each cooling orifice to make sure it is not plugged or damaged. (2) Use a soft wire and compressed air to clean orifice.  Replace, if condition is questionable. 3-185


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