TM 9-4310-397-14(8)Check push rods (Figure 6-26, 1) for straightness by rolling on a flat surface.Figure 6-26. Inspect Push Rods(9)Replace defective push rods.(10)Inspect valve springs.(a). Inspect valve springs for alignment, wear and damage.(b). Put springs on a flat surface to see that they are square and parallel.(c). Check valve spring tension using spring compression tester (item 13, section III, appendix B) and the specifications given for the valve spring.NOTEFree length of springs differ slightly, but compressed height must be the same.Valve Spring SpecificationsCompressionHeight54-62 lb force (240-276 N). ..............................................1.81 in. (46 mm)133-153 lb force (591-680N) ............................................1.36 in. (34.5 mm)(11)Inspect and measure valves.(a)Visually inspect valves to determine if they can be restored to a serviceable condition. Replace valvesthat are burned, cracked, eroded, or chipped.6-27
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