Quantcast b. Inspect and measure connecting rod bearing

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ARMY TM 9-2815-255-24 AIR FORCE TO 38G1-95-2 MARINE CORPS TM 2815-24/4 CAUTION Keep bearing Inserts with their respective rods and caps.  Mark rods, pistons, and caps to ensure correct assembly In same location. NOTE Use  bearing  gage  (PLASTIGAGEPR1)  as  directed  by  manufacturer.    Remember,  use  of  bearing gage  will  determine  bearing  to  journal  clearance,  but  will  not  indicate  the  condition  of  either surface. (1) Remove  connecting  rod  cap.    Place  a  piece  of  bearing  gage  (PLASTIGAGEPR1)  in  center  of  bearing. Install cap and initially tighten old capscrews to 41 ft-l4bs (56 Nm).  Tighten capscrews an additional 90 to 100 degrees, refer to paragraph 3-50.3.i for Torque-Turn Method for proper torque. (2) Remove  cap  and  compare  width  of  bearing  gage  with  scale  provided  on  side  of  package  to  determine clearance.  Maximum permissible clearance is 0.0062 inch (0.16 mm). b. Inspect and measure connecting rod bearing as follows: CAUTION Never use new connecting rod caps crews when checking rod bearing ID.  Use new capscrews only for final assembly of connecting rods. (1) With crankshaft removed, measure connecting rod journal OD at several points.  OD should be 2.748 to 2.749 inches (69.80 to 69.82 mm). (2) Install connecting rod cap on rod with bearings using old capscrews. (3) Install rod capscrews and initially tighten to 41 ft-lbs (56 Nm).  Tighten capscrews an additional 90 to 100 degrees, refer to paragraph 3-0.3.i for Torque-Turn Method for proper torque. (4) Using an inside micrometer, measure assembled ID of rod bearing.  ID should be 2.750 to 2.752 inches (69.85 to 69.90 mm) (5) Subtract OD of crankshaft journals from ID of rod bearings to obtain oil clearance.  Oil clearance for new parts should be 0.0012 to 0.004 inch (0.03 to 0.10 mm).  Maximum serviceable clearance is 0.0062 inch (0.16 mm). (6) Inspect  connecting  rod  bearings  for  wear  or  damage.    If  bearings  are  worn  or  are  out  of  specification, replace both connecting rod bearings. c. Inspect rod and cap as follows: (1) Inspect rod and cap for wear or damage, such as chips or cracks in joint area. (2) Inspect in and around capscrew holes in cap.  if any defects are found, replace rod and cap. (3) Carefully clamp rod in a soft-jawed vise (cap end upward). CAUTION Never use new connecting rod caps crews when checking rod bore ID.  Use new capscrews only for final engine assembly. (4) Install cap without bearing inserts. 3-195


 


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