TM-9-2815-205-24 Technical Manual for M113 Engine 6V53 6V53T Download
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INSPECTION-ACCEPTANCE AND REJECTION CRITERIA - Continued 8. If new connecting rod is required, stamp cylinder number on connecting rod (Figure 5, Item 22) and cap (Figure 5, Item 7) using metal stamping die set. CRITICAL AREA ACCEPTABLE LIMITS NONCRITICAL AREA A A 22 7 SECTION A-A VIEW A VIEW A DO NOT USE OR ATTEMPT TO REPAIR RODS WITH INDICATIONS OVER 0.005 in . (0.13 mm) DEEP EXTENDING OVER EDGES OF "H" SECTION ON BOTH SIDES OF FLANGE. SHADED AREAS ARE MOST HIGHLY STRESSED. START OF FATIGUE CRACK RESULTING FROM OVERLOADING (DUE TO HYDROSTATIC LOCK). DO NOT ATTEMPT TO REPAIR. EXAMPLE OF A TRANSVERSE INDICATION THAT DOES NOT FOLLOW LONGITUDINAL FORGING FLOW LINES CAN BE EITHER A FORGING LAP, HEAT TREAT CRACK, OR START OF A FATIGUE CRACK. INDICATIONS IN NONCRITICAL AREAS ARE ACCEPTABLE UNLESS THEY ARE OBVIOUS CRACKS WITHOUT MAGNETIC INSPECTION. LONGITUDINAL INDICATIONS FOLLOWING FORGED FLOW LINES ARE USUALLY SEAMS AND ARE NOT HARMFUL IF LESS THAN 0.03 in. (0.8 mm) DEEP. DETERMINE DEPTH BY GRINDING A SMALL AREA NEAR THE CENTER OF THE INDICATION. ACCEPT TRANSVERSE INDICATIONS (ACROSS FLOW LINES) HAVING A MAXIMUM GRINDING LENGTH OF 0.5 in. (12.7 mm) AND DEPTH OF 0.016 in. (0.41 mm) AFTER COMPLETE REMOVAL. AN EXCEPTION IS A ROD HAVING AN INDICATION, WHICH EXTENDS OVER THE EDGE OF THE "H" SECTION AND IS PRESENT ON BOTH SIDES OF THE FLANGE. THEN THE MAXIMUM ALLOWABLE DEPTH IS 0.005 in. (0.13 mm). SEE SECTION A-A. GRINDING NOTES: TAKE CARE IN GRINDING OUT INDICATIONS TO ENSURE PROPER BLENDING OF GROUND AREA INTO UNGROUND SURFACE SO AS TO FORM A SMOOTH CONTOUR. POOR PRACTICE GOOD PRACTICE EXAMPLE OF AN INDICATION FOLLOWING LONGITUDINAL FORGING FLOW LINES. MAINT_375 Figure 5. Connecting Rod Inspection Procedures. 9. Inspect bearing shells for scoring, pitting, flaking, etching, and dirt grooving. If defective, discard bearing shells. 10. Discard bearing shells with bright spots on backs indicating movement in bearing caps or supports. TM 9-2815-205-24 0095 0095-8