Cylinder Head, Valves and Manifolds Valve Stem O.D. - 3TN66: Distance A . . . . . . . . . . . . . . . . .20 mm (0.787 in.) Distance B . . . . . . . . . . . . . . . . .40 mm (1.575 in.) Intake Valve Standard . . . . . . . . . . . . . . . . . 5.46 - 5.48 mm . . . . . . . . . . . . . . . . . . . . .(0.2149 - 0.2157 in.) Wear Limit. . . . . . . . . . . 5.40 mm (0.2126 in.) 1 M35307 Exhaust Valve Standard . . . . . . . . . . . . . . . . . 5.44 - 5.46 mm . . . . . . . . . . . . . . . . . . . . .(0.2142 - 0.2149 in.) Wear Limit. . . . . . . . . . . 5.40 mm (0.2126 in.) If valve faces are worn, burned or pitted, grind valves to proper face angle.
If valve face margin is less than 0.51 mm (0.020 in.) after grinding, replace valve. Valve Stem O.D. - 3TNA72 (3009): Distance A . . . . . . . . . . . . . . . . .25 mm (0.984 in.) Distance B . . . . . . . . . . . . . . . . .45 mm (1.772 in.) Intake and Exhaust Valves Valve Face Margin Standard . . . . . . . . . . . . . . . . . 6.94 - 6.96 mm . . . . . . . . . . . . . . . . . . . . .(0.2732 - 0.2740 in.) Wear Limit. . . . . . . . . . . 6.90 mm (0.2717 in.) Measure valve recession using a depth gauge. Replace valve or cylinder head if measurement exceeds specification. Measure valve stem diameter at two locations shown. Replace valve if measurement exceeds wear limit.
4/7/95 1-25 AllTractorManuals.com Va A Ex Int Va A lve Face ngle Ex Int haust: 45° ake:30° 45° ° 30 ° Valve Recession Cylinder Head Depth Gauge M82032A M82032A A B M82031A M82031A