Quantcast FIGURE 3-152.  Tightening Connecting Rod Caps

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ARMY TM 9-2815-255-24 AIR FORCE TO 38G1-95-2 MARINE CORPS TM 2815-24/4 CAUTION Never   use   connecting   rod   capscrews   (1,   FIGURE   3-123)   more   than   once   for   final   engine assembly. h. Dip new connecting rod capscrews (1) in clean engine lubricating oil (MIL-L-2104) and install.  Tighten capscrews alternately to 41 ft-lbs (56 Nm). i. Torque-turn all capscrews 90 to 100 degrees as follows: (1) After tightening capscrews (1) to the values given above, mark connecting rod cap (A, FIGURE 3-152) and socket. (2) Make a second mark on socket 90 degrees counterclockwise from first mark. (3) Tighten 1/4 turn (90 to 100 degrees) clockwise until mark (B) is in line with mark (A) on cap. j. Check engine rotation for excessive tightness as follows: (1) Rotate crankshaft several revolutions to be sure engine rotates without excessive tightness. (2) Check liners (9, FIGURE 3-124) for deep scratches which would indicate an improperly installed or broken piston ring(s). FIGURE 3-152.  Tightening Connecting Rod Caps (3) Check for proper side clearance in all rods.  Each rod should have slight side-to-side movement. k. Measure piston protrusion as follows: NOTE Press down on top of piston to remove oil clearances before measuring piston protrusion. (1) Mount a dial indicator in gage (JDG451).  Place gage on top of cylinder block in such a manner that dial indicator can be set at 'zero" with top of block. (2) Position  gage  across  piston  with  outer  ends  on  block  so  dial  indicator  plunger  can  contact  top  of  piston, refer to FIGURE 3-153.  Press down on top of gage and rotate crankshaft until piston is at TDC.  Piston height must be checked at outer most diameter of piston. (3) Piston  protrusion  should  be  0.003  to  0.012  inch  (0.08  to  0.30  mm)  to  prevent  piston-to-exhaust  valve contact. 3-210


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