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ARMY TM 9-2815-256-24 AIR FORCE TO 38G1-96-2 MARINE CORPS TM 2815-24/5 WARNING Compressed air used for cleaning can create airborne particles that may enter the eyes.  Pressure will not exceed 30 psig (207 kPa).  Eye protection required. a. Inspect gear for wear or damage. b. Check crankshaft end play as follows: NOTE It is recommended that crankshaft end play be measured prior to removing crankshaft to determine condition of thrust bearings.  Crankshaft end play may also be checked at front end of crankshaft. (1) Position dial indicator on face of flywheel. (2) Push crankshaft as far to rear of engine as possible. (3) Zero dial indicator. CAUTION Do not apply too much pressure with bar, as this could damage bearings. (4) Using a bar, gently pry crankshaft as far forward as possible. (5) End play for new two piece thrust bearing is 0.002 to 0.008 inch (0.05 to 0.20 mm).  Maximum serviceable end play is 0.015 inch (0.38 mm). NOTE New thrust bearings will usually restore proper end play.  If end play is not within specification on two piece flanged thrust bearings, install a two piece thrust bearing (without flange) and oversized thrust washers. c. Inspect crankshaft as follows: (1) Clean crankshaft using solvent and compressed air. (2) Inspect oil passages to make sure they are open.  Use compressed air and a small piece of wire. (3) Inspect crankshaft for any signs of load stress, cracks, scoring, or scratches on journals.  (An inspection must  be  made  if  the  crankshaft  damper  was  found  to  be  damaged  or  defective.)  FIGURE  3-138  shows critical areas of load stress in a crankshaft. 3-183


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