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Page Title: INSPECTION
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TM5-4210-229-14&P 6-12.  PISTON AND CONNECTING ROD MAINTENANCE (Continued). (5) Remove connecting rod piston pin bushing using a suitable arbor press.  Discard old bushing. INSPECTION a.  Connecting rod inspection Cleaning solvent, (Appendix D, ,Item 54) is both toxic and flammable.  Keep off skin. Use only in a well ventilated area and avoid prolonged breathing of vapors.  Keep away from open flames. (1) Using a cleaning solvent (Appendix D, Item 54) clean the threads and mating surfaces between the rod and cap. (2) Clean the oil hole at the top of the rod and keep it unclogged. (3) Clean all bolts thoroughly. (4) Inspect all bolts for nicks or damage.  When lubricated, the bolts must screw into the rod face by hand.  If the bolt will not screw in by hand, reclean the rod threads and try a new bolt.  If a new bolt does not screw in freely, the rod must be discarded. CAUTION Do not retap rods as this is a special rolled thread. (5) When new bolts are used in a rod, they must be torqued to 130 ft-lb (175 N.m), loosened, and retorqued three times. (6) Check the integrity of connecting rod bear- ing bores for mis-match between cap and the rod and for out-of-round.  These checks are only valid when the insert is omitted and bolts are torqued to 130 ft-lb (175 N.m) using lubricating oil (Appendix D, Item 37) as a lubricant under the head of the bolt and in the threads.  An inside micrometer is re- commended, but a dial bore gauge can be used for measurements. CAUTION Lack of attention to the integrity of connecting rod bearing bores during an overhaul may re- sult in a rod bearing failure.  Careful attention must be given to all aspects of the rod and bolts. (7) Measure and record the three inside diam- eters of each rod at points A, B, and C. (8) If the difference between points A and C is over 0.004 in.  (0.10 mm), the mismatch is excessive and the rod should be discar- ded. (9) If the difference between point B and the average of A and C (A+ C divided by 2) exceeds 0.002 in.  (0.05 mm), the rod should be discarded. b.  Running clearance and end clearance inspection. CAUTION Do not turn the crankshaft during the follow- ing procedures. 6-30

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