Pistons, Rods and Cylinder Block Inspection/Replacement If bearing diameter exceeds wear limit, replace bearing inserts. 1. Inspect all parts for wear or damage. Replace as necessary. If bearing clearance (bearing I.D. minus crankshaft journal O.D.) exceeds specification, grind crankshaft connecting rod journals and install undersized bearing inserts, or replace bearing inserts and crankshaft. 2. Measure crankshaft connecting rod journal diameter. (See Crankshaft, Main Bearings and Flywheel in this section.) 3. Install connecting rod cap and bearing inserts on connecting rod. Install old connecting rod cap screws and tighten to 23 N•m (203 lb-in.) . 5.
With rings installed on piston, measure piston ring groove clearance. Measure several places around each piston. 1 4. Measure connecting rod bearing diameter. M35360 Piston Ring Groove Clearance - 3TN66: First Compression Ring Standard . . . . . . . . . . . . . . . 0.065 - 0.100 mm . . . . . . . . . . . . . . . . . . . . .(0.0026 - 0.0039 in.) Wear Limit. . . . . . . . . . . 0.20 mm (0.0079 in.) Connecting Rod Bearing I.D. - 3TN66: Standard . . . . . . . . . . . . . . 36.00 - 36.042 mm . . . . . . . . . . . . . . . . . . . . . . .(1.417 - 1.419 in.) Wear Limit. . . . . . . . . . . 37.07 mm (1.459 in.) Clearance . . . . . . . . . . . . . 0.16 mm (0.006 in.) Second Compression Ring Standard .
. . . . . . . . . . . . . . 0.030 - 0.065 mm . . . . . . . . . . . . . . . . . . . . .(0.0012 - 0.0026 in.) Wear Limit. . . . . . . . . . . 0.20 mm (0.0079 in.) Connecting Rod Bearing I.D. - 3TNA72 (3009): Standard . . . . . . . . . . . . . . 40.00 - 40.042 mm . . . . . . . . . . . . . . . . . . . . . . .(1.575 - 1.577 in.) Wear Limit. . . . . . . . . . . 40.07 mm (1.578 in.) Clearance . . . . . . . . . . . . . 0.16 mm (0.006 in.) Oil Ring Standard . . . . . . . . . . . . . . . 0.020 - 0.055 mm . . . . . . . . . . . . . . . . . . . . .(0.0008 - 0.0022 in.) Wear Limit. . . . . . . . . . . 0.20 mm (0.0079 in.) 1-36 4/7/95 AllTractorManuals.com M82048 M82048 A