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ARMY TM 9-2815-252-24 AIR FORCE TO 38G1-92-2 i. Install (hand-tighten) a capscrew (1) into nearest connecting rod bearing cap bolt hole. j. Using a suitable lever against crankcase and end of capscrew, press down on end of lever until piston rings are clear of cylinder bore. k. Lift out piston (5) and connecting rod (3) and tag with corresponding cylinder number. I. Install bearing cap (2) onto connecting rod (3). 3-30.2.   Inspect and Measure. a. Thoroughly clean cylinder barrel.  Check for scoring and wear. b. Clean piston (5, FIGURE 3-36) by removing all traces of carbon from both upper and underside of crown and ring grooves. c. Check for correct gap clearance, refer to TABLE 3-6, with piston rings (6) in an unworn section of cylinder barrel. d. Clean connecting rod (3). e. Check bushing (9) for wear.  Replace if worn. f. If big end has been disassembled because of metal failure, oil passages in crankshaft must also be examined for obstruction and fragments of metal. NOTE The maximum advisable piston to cylinder clearance given is the clearance between the bottom of the piston skirt, across the faces, and the cylinder bore measured in the region of travel of the piston  skirt.    The  clearance  is  not  to  be  measured  at  the  top  of  the  bore.  When  cylinders  are rebored, the lower skirt should be etched or painted with the amount of the oversize. NOTE The ring gaps given in TABLE 3-6 are those to be anticipated when checking rings in an unworn part of the bore.  For every 0.01 mm (0.0004 in.) by which the actual bore size exceeds the initial dimension, the ring gap will increase by approximately 0.03 mm (0.0012 in.).  The firing ring side clearance is measured with a new ring flush with the top piston land. NOTE Oversize pistons and piston rings, and under-size big end and main bearing shells are available. Nonstandard sizes are marked, by the amount they are under or oversize, as a suffix to the part numbers which can be found in the following locations: · Piston Rings - stamped on the face of the ring. · Pistons - stamped on the top surface. · Bearings - stamped on the steel outside surface of the bearing. g. Using  appropriate  measuring  devices,  check  components  listed  in  TABLE  3-6  for  wear.    Replace  components that exceed maximum clearance. 3-30.3.   Repair. NOTE Lay piston rings (6, FIGURE 3-36) out in order of removal to aid in installation. a. Use a standard ring expander to remove piston rings (6). b. Remove retaining rings (7) and push pin (8) out of connecting rod (3) and piston (5).  Separate piston (5) from connecting rod (3). 3-67


 


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