TM 5-3825-225-14&P(6)Examine the big end bearing sleeves for any signs of wear or pitting.dAssembly (see Appendix E Figure 54).(1)If original pistons (5) are to be installed, they mustbe assembled to the same connecting rod (6), i.e.,no. 1 piston to no. 1 connecting rod assembly.See Figures 5-20 and 5-21 for location of piston andconnecting rod numbering. Any new componentsfitted should be numbered the same as those thatthey replace.(2)Warm the piston (5) in a suitable clean liquid(usually water) to a temperature of 100-120F (40-50C). This will enable the piston pin (4) to beeasily pushed into the piston bore when the pistonand connecting rod (6) have been correctly aligned.(3)Place no. 1 piston (5) onto its head, noting theposition of the mark previously made to indicateFRONT.(4)Hold no. 1 connecting rod (6) with the small endbetween the piston pin bores so that the wordFRONT cast on the rod is toward the same side.(5)Push the piston pin (4) into the piston, locating theconnecting rod (6) in position.(6)Install the two new retaining rings (3) securely inpiston pin grooves.(7)Repeat this procedure for the three remainingpistons and connecting rods.(8)Install piston rings (1).(a)Plain parallel faced compression.(b)Internally stepped compression.Figure 5-20. Connecting Rod Matching Ends.NOTEAlways ensure that Internally stepped ortaper-faced rings are correctly fitted. They aremarked TOP or BTM (bottom) to ensurecorrect replacement. The top compressionand slotted oil control rings may be fittedeither way up.Figure 5-21. Engine Block.TA5063405-20
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