Crankshaft, Main Bearings and Flywheel 3. Measure crankshaft connecting rod journal and main bearing journal diameters. Measure several places around each journal. 4. Install bearing inserts and main bearing cap on main bearing. Tighten main bearing cap screws to specifications. NOTE: If engine has had a previous major overhaul, journals may have been ground and undersized bearing inserts installed. Main Bearing Cap Screw Torque Specifications: 3TN66. . . . . . . . . . . . . . . . . . 54 N•m (40 lb-ft) 3TNA72 (3009) . . . . . . . . . . 79 N•m (58 lb-ft) 5. Measure main bearing diameter. 1 M35408 Connecting Rod Journal O.D. - 3TN66: Main Bearing I.D. - 3TN66: Standard . . . . . . . . . . . .
. . . 35.97 - 35.98 mm . . . . . . . . . . . . . . . . . . . . .(1.4161 - 1.4165 in.) Standard . . . . . . . . . . . . . . 40.00 - 40.042 mm . . . . . . . . . . . . . . . . . . . . . . .(1.575 - 1.577 in.) Wear Limit. . . . . . . . . . . 35.92 mm (1.414 in.) Wear Limit. . . . . . . . . . . 40.07 mm (1.578 in.) Connecting Rod Journal O.D. - 3TNA72 (3009): Clearance . . . . . . . . . . . . 0.15 mm (0.0059 in.) Standard . . . . . . . . . . . . . . . 39.97 - 39.98 mm . . . . . . . . . . . . . . . . . . . . .(1.5736 - 1.5740 in.) Main Bearing I.D. - 3TNA72 (3009): Wear Limit. . . . . . . . . . . 39.92 mm (1.572 in.) Standard . . . . . . . . . . . . . . 44.00 - 44.042 mm . . . . . . . . . . . . .
. . . . . . . . . .(1.732 - 1.734 in.) Main Bearing Journal O.D. - 3TN66: Wear Limit. . . . . . . . . . . 44.07 mm (1.735 in.) Standard . . . . . . . . . . . . . . . 39.97 - 39.98 mm . . . . . . . . . . . . . . . . . . . . .(1.5736 - 1.5740 in.) Clearance . . . . . . . . . . . . 0.15 mm (0.0059 in.) Wear Limit. . . . . . . . . . . 39.92 mm (1.572 in.) If bearing diameter exceeds wear limit, replace bearing inserts. If bearing clearance (bearing I.D. minus crankshaft main bearing journal O.D.) exceeds specification, replace bearing inserts and crankshaft or have crankshaft journals ground undersize by a qualified machine shop and install undersized bearing inserts. Main Bearing Journal O.D.
- 3TNA72 (3009): Standard . . . . . . . . . . . . . . . 43.97 - 43.98 mm . . . . . . . . . . . . . . . . . . . . .(1.7311 - 1.7315 in.) Wear Limit. . . . . . . . . . . 43.92 mm (1.729 in.) If journal diameter is less than wear limit, replace crankshaft or have journals ground undersize by a qualified machine shop. Bearing inserts are available in 0.25 mm (0.010 in.) undersize. 6. Clean and inspect oil passages in main bearing journals, connecting rod journals and main bearing bores in cylinder block. If journals are ground, undersize bearing inserts must be installed. Bearing inserts are available in 0.25 mm (0.010 in.) undersize. 7. Inspect crankshaft for cracks or damage.
Replace if necessary. 1-50 4/7/95 AllTractorManuals.com Main Bearing Journal Connecting Rod Journal M82062A M82062A