Quantcast FIGURE   3-70.   Checking   Valve   Contact   Width

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ARMY TM 9-2815-254-24 AIR FORCE TO 38G1-94-2 (2)   Use a depth gage or straight edge with steel rule to measure valve depression from cylinder head lower surface. (3) The standard depression is 0.028 in. (0.7 mm), with a limit of 0.11 in. (2.7 mm). If depression exceeds limit, replace valve seat insert. i. Check valve contact width as follows: (1) Check valve contact faces for roughness and unevenness. Smooth contact surfaces as necessary. (2)   Using  blue  bearing  dye  (HISPOTBLUE  107),  coat  valve  seat  insert.  Install  valve  and  rotate  valve  to  pickup chalk on valve. (3) Measure valve contact width. Refer to FIGURE 3-70. Standard width is 0.05 to 0.06 in. (1.2 to 1.5 mm), with a limit of 0.08 in. (2.0 mm). (4) If measured value exceeds limit, replace valve seat insert. FIGURE   3-70.   Checking   Valve   Contact   Width j. Check valve spring free length using a vernier caliper, refer to FIGURE 3-71. Standard height of inner spring is 1.89 in. (47.9 mm), with a limit of 1.83 in. (46.5 mm). Standard height of outer spring is 1.86 in. (47.3 mm), with a limit of 1.80 in. (45.8 mm). If measured value is less than limit, replace spring. k. Check valve spring inclination using a surface plate and a square. lf inclination measured exceeds 0.04 in. (1.0 mm), replace spring. 3-119


 


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