Pistons, Rods and Cylinder Block Piston Pin O.D. - 3TN66: Standard . . . . . . . . . . . . . . 19.991 - 20.00 mm . . . . . . . . . . . . . . . . . . . . . . .(0.787 - 0.788 in.) Wear Limit. . . . . . . . . . 19.975 mm (0.786 in.) Piston Pin O.D. - 3TNA72 (3009): Standard . . . . . . . . . . . . . . 20.991 - 21.00 mm . . . . . . . . . . . . . . . . . . . . . . .(0.826 - 0.827 in.) Wear Limit. . . . . . . . . . 20.975 mm (0.825 in.) 1 If pin diameter is less than wear limit, replace pin. 8. Measure piston pin bore diameter in piston. Piston Pin Bushing I.D. - 3TN66: Standard . . . . . . . . . . . . . 20.025 - 20.038 mm . . . . . . . . . . . . . . . . . . . . . .
.(0.788 - 0.789 in.) Wear Limit. . . . . . . . . . . 20.10 mm (0.781 in.) Clearance . . . . . . . . . . . . 0.11 mm (0.0043 in.) Piston Pin Bushing I.D. - 3TNA72 (3009): Standard . . . . . . . . . . . . . 21.025 - 21.038 mm . . . . . . . . . . . . . . . . . . . . .(0.8278 - 0.8282 in.) Wear Limit. . . . . . . . . . . 21.10 mm (0.831 in.) Clearance . . . . . . . . . . . . 0.11 mm (0.0043 in.) Piston Pin Bore I.D. - 3TN66: Standard . . . . . . . . . . . . . . 20.00 - 20.008 mm . . . . . . . . . . . . . . . . . . . . . . .(0.787 - 0.788 in.) Wear Limit. . . . . . . . . . . 20.02 mm (0.788 in.) Clearance . . . . . . . . . . .
0.045 mm (0.0018 in.) If bushing diameter exceeds wear limit, replace bushing. If bushing clearance (bushing I.D. minus pin O.D.) exceeds specification, replace bushing, piston pin or both. Piston Pin Bore I.D. - 3TNA72 (3009): Standard . . . . . . . . . . . . . . 21.00 - 21.009 mm . . . . . . . . . . . . . . . . . . . . .(0.8268 - 0.8271 in.) Wear Limit. . . . . . . . . . . 21.02 mm (0.828 in.) Clearance . . . . . . . . . . . 0.045 mm (0.0018 in.) Piston pin bushing is press fit. Replace bushing using a driver set. When installing bushing, make sure to align oil hole in bushing with hole in connecting rod. If piston pin bore exceeds wear limit, replace piston.
10.Measure piston diameter perpendicular to piston pin bore at distance A. If bore clearance (bore I.D. minus pin O.D.) exceeds specification, replace piston, piston pin or both. 9. Measure piston pin bushing diameter in connecting rod. NOTE: If engine has had a previous major overhaul, oversize pistons and rings may have been installed. Pistons and rings are available in 0.25 mm (0.010 in.) and 0.50 mm (0.020 in.) oversize. 1-38 4/7/95 AllTractorManuals.com M82 M82 051A M37683