Cylinder Head, Valves and Manifolds Lapping Tool 1 M82042A M82041A Piston-to-Cylinder Head Clearance: MEASURE PISTON-TO-CYLINDER HEAD CLEARANCE 3TN66. . . . . . . . . . . . . . . . . . . . 0.59 - 0.74 mm . . . . . . . . . . . . . . . . . . . . . . . (0.023 - 0.029 in.) 3TNA72 (3009) . . . . . . . . . . . . 0.61 - 0.79 mm . . . . . . . . . . . . . . . . . . . . . . . (0.024 - 0.031 in.) 1. Place three 10 mm (0.400 in.) long pieces of 1.50 mm (0.060 in.) diameter soft wire in three positions on the flat part of the piston head. If clearance is less than specifications, replace cylinder head. 2. Install cylinder head and old gasket.
Install cylinder head cap screws and tighten in proper sequence to specified torque. (See CYLINDER HEAD AND VALVES - Removal/Installation in this group.) 3. Slowly turn crankshaft one complete revolution. 4. Remove cylinder head and gasket. 5. Measure thickness of flattened section of each piece of wire. Calculate average thickness of wires to obtain piston-to-cylinder head clearance specification. 4/7/95 1-31 AllTractorManuals.com