Quantcast c.  Inspection and Repair (Contd) - TM-9-2815-225-34P_169

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TM 9-2815-225-34&P 3-35.  CYLINDER HEAD AND VALVE REPAIR (Contd) LOCATION/ITEM ACTION REMARKS c.  Inspection and Repair (Contd) NOTE Repeat step 20 for each intake and exhaust valve. 20. Valve (13) or (14) a.  Polish with crocus cloth. b.  Inspect head of valve (13) or Discard if damaged or if valve (14) for cupping, cracking, pitting, head rim thickness is less than and wear. 0.105 in. (2.667 mm). c.  Inspect stem of valve (13) or (14) Discard if damaged or if stem for cracks, scoring, galling, wear diameter is less than wear limit or bends. shown below. Wear Limit .................................................................... 0.449 in. (11.405 mm) New Minimum ............................................................... 0.450 in. (11.430 mm) New Maximum .............................................................. 0.451 in. (11.455 mm) d.  Check collet grooves on valve Use new valve collets (2) to check (13) or (14) stem for wear. grooves.  Discard valve (13) or (14) if collets fit loosely in grooves. e.  Inspect for cracks using magnetic method: (1)  Magnetize valve (13) or (14) Inspect area A (refer to in coil at 100 to 300 amperes, and illustration) and discard valve (13) inspect with residual Magnaglo. or (14) with more than five If damaged, defects will show indications, longer than 0.500 in. around circumference of valve. (12.7 mm), or indications spaced closer than 0.125 in. (3.175 mm). (2)  Magnetize valve (13) or (14) Inspect areas B, C, D, and E by headshot magnetization at (refer to illustration).  No visible 500 to 700 amperes, and inspect or magnetic indication is with residual Magnaglo. acceptable.  Discard.  Demagnetize acceptable valves (13) or (14). NOTE Repeat step 21 for each intake and exhaust valve crosshead. 21. Valve crosshead (22) or (28) a.  Inspect for excessive wear, Discard if damaged. distortion, grooving, scoring, galling, stripped threads, broken areas, and out-of-round. b.  Inspect for cracks using Discard if any cracks are found. magnetic method. 3-138


 


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