Quantcast c.  Inspection (Contd) - TM-9-2815-225-34P_151

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TM 9-2815-225-34&P 3-35.  CYLINDER HEAD AND VALVE REPAIR (Contd) LOCATION/ITEM ACTION REMARKS c.  Inspection (Contd) 14. Eight valve stem guides (18) a.  Inspect for chips, cracks, burrs, Replace if damaged (refer to step broken-out sections, and extensive 14d for replacement). wear. b.  Measure protrusion. Use suitable micrometer.  Replace if not within 1.270-1.280 in. (3.226-3.251 cm).  (Refer to step 14d for replacement.) c.  Set small bore gauge to Replace if gauge goes into bore or 0.4552 in. (11.562 mm) and if bore is more than wear limit attempt to insert it in bore of shown below.  (Refer to step 14d valve stem guide. for replacement.) Wear Limit  ................................................................. 0.4550 in. (11.557 mm) New Minimum ............................................................. 0.4525 in. (11.494 mm) New Maximum ............................................................ 0.4532 in. (11.511 mm) d.  Replace valve stem guide (18) Do not replace unless damaged as follows: or not within wear limits. (1)  Drive out valve stem guide Use suitable step punch.  Discard (18) from underside of cylinder valve stem guide. head (9). (2)  Install new valve stem guide Use valve guide driver (3375282) (18). (34).  Ensure height of valve stem guide is between 1.270-1.280 in. (3.226-3.251 cm) after installation. (3)  Using new valve (13) or (14), If valve does not move freely in check bore of new valve stem valve stem guide (18), ream valve guide. stem guide (18) from bottom side of cylinder head (9) to specifica- tions shown in step 14c. 15. Four intake valve inserts a.  Check for looseness by (12) and four exhaust valve carefully striking cylinder head inserts (15) (9) with wood block or rubber hammer. b.  Measure valve seat area Perform step 15d only if width is width (A or B in illustration). less than 0.0625 in. (1.5875 mm) or more than 0.125 in. (3.175 mm) at any point. c.  Check valve seat for Total run out should not concentricity with valve stem exceed 0.002 in. (0.051 mm). guide (18). d.  Replace valve insert (12) or (15) as follows: (1) Clean area around valve seat. (2) Place valve seat extractor (35) Use valve seat extractor (ST-1279) into valve seat and expand until (35).  Ensure extractor (35) is not jaws are under valve insert (12). canted. (3) Remove valve insert (12) or Use suitable slide hammer. (15) from cylinder head (9). Discard valve insert (12) or (15). (4) Drive new valve insert (12) or Use valve seat insert staking (15) in valve seat insert counter- tool (ST-1124) (36). bore of cylinder head (9) until fully seated. 3-120


 


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