Pistons, Rods and Cylinder Block Piston Ring Groove Clearance - 3TNA72 (3009): Piston Ring End Gap - 3TN66: Standard First Compression Ring and Oil Ring . . . . . . . . . . . . . 0.15 - 0.35 mm . . . . . . . . . . . . . . . . . . . . . .(0.006 - 0.014 in.) Second Compression Ring . . 0.25 - 0.40 mm . . . . . . . . . . . . . . . . . . . . . .(0.010 - 0.016 in.) Wear Limit. . . . . . . . . . . 1.50 mm (0.0591 in.) First Compression Ring Standard . . . . . . . . . . . . . . . 0.075 - 0.110 mm . . . . . . . . . . . . . . . . . . . . .(0.0030 - 0.0043 in.) Wear Limit. . . . . . . . . . . 0.20 mm (0.0079 in.) Second Compression Ring Standard . . . . . . . . . . . . . . . 0.030 - 0.065 mm . . . . .
. . . . . . . . . . . . . . . .(0.0012 - 0.0026 in.) Wear Limit. . . . . . . . . . . 0.20 mm (0.0079 in.) 1 Piston Ring End Gap - 3TNA72 (3009): Standard First Compression Ring . . . . 0.10 - 0.25 mm . . . . . . . . . . . . . . . . . . . . . .(0.004 - 0.010 in.) Second Compression Ring . . 0.25 - 0.40 mm . . . . . . . . . . . . . . . . . . . . . .(0.010 - 0.016 in.) Oil Ring . . . . . . . . . . . . . . . . . 0.15 - 0.35 mm . . . . . . . . . . . . . . . . . . . . . .(0.006 - 0.014 in.) Wear Limit: . . . . . . . . . . 1.50 mm (0.0591 in.) Oil Ring Standard . . . . . . . . . . . . . . . 0.020 - 0.055 mm . . . . . . . . . . . . . . . . . . . . .(0.0008 - 0.0022 in.) Wear Limit. . . . . . . . . .
. 0.20 mm (0.0079 in.) If clearance exceeds wear limit, replace rings or piston. 6. Measure piston ring end gap. Push ring into cylinder bore, using a piston, until ring is approximately 30 mm (1.181 in.) from bottom of cylinder bore. If end gap exceeds wear limit, replace rings. 7. Measure piston pin diameter. Measure diameter at six places. 4/7/95 1-37 AllTractorManuals.com Cylin Bore Piston Ring End der .) End Gap Gap Approx. 30 mm (1.181 in .) End Gap M82049A Measuring Positions M82050A nd Gap Cylin Bore der