Cylinder Head, Valves and Manifolds Length Feeler Gauge 1 M82023A Rocker Arm and Shaft Support I.D.’s - 3TN66: Push Rod Length: 3TN66. . . . . . . . . . . . . . . . . . . . . 114 - 115 mm . . . . . . . . . . . . . . . . . . . . . . .(4.488 - 4.528 in.) 3TNA72 (3009) . . . . . . . . . . . . . 141 - 142 mm . . . . . . . . . . . . . . . . . . . . . . .(5.550 - 5.590 in.) Standard . . . . . . . . . . . . . . . 10.00 - 10.02 mm . . . . . . . . . . . . . . . . . . . . .(0.3937 - 0.3945 in.) Wear Limit. . . . . . . . . . 10.09 mm (0.3972 in.) Clearance . . . . . . . . . . . . . 0.14 mm (0.005 in.) Push Rod Bend: Rocker Arm and Shaft Support I.D.’s - 3TNA72 (3009): Wear Limit. . . . . . . . . . . .
0.08 mm (0.003 in.) Replace push rod if not within specifications. Standard . . . . . . . . . . . . . . . 12.00 - 12.02 mm . . . . . . . . . . . . . . . . . . . . .(0.4724 - 0.4732 in.) Wear Limit. . . . . . . . . . 12.09 mm (0.4759 in.) Clearance . . . . . . . . . . . . . 0.14 mm (0.005 in.) CYLINDER HEAD AND VALVES Removal/Installation Replace rocker arms or supports if I.D. is more than wear limit. 1. Remove rocker arm assembly, push rods and valve caps. (See procedure in this group.) If shaft and support/arm clearance (support/arm I.D. minus shaft O.D.) exceed wear limit, replace all parts. 2. Remove exhaust and intake manifolds.
(See procedures in this group.) Measure length and bending of push rod. 3. Remove water pump. (See Cooling System in this section.) 4/7/95 1-21 AllTractorManuals.com M82022A