SHAFT 8T9998 - Caterpillar

Illustration 1 g01347487
Illustration 2 g00287852
Marks for tightening connecting rod bolts (A) Bore in connecting rod for piston pin bearing ... 46.355 0.013 mm (1.8250 0.0005 inch)Note: The connecting rod must be heated for the installation of the piston pin bearing. Do not use a torch. (B) The connecting rod must be heated from 177 to 260 °C (351 to 500 °F) for the installation of the piston pin bearing. The maximum distance for heating the connecting rod ... 72.6 mm (2.86 inch) (C) Bore in the bearing for the piston pin ... 43.211 0.008 mm (1.7012 0.0003 inch)Diameter of piston pin (new) ... 43.175 0.005 mm (1.6998 0.0002 inch)Maximum permissible clearance between the bearing and the worn piston pin ... 0.08 mm (0.003 inch)Note: Thoroughly lubricate the piston pin with clean engine oil prior to assembly into the piston and the rod assembly. (1) The piston pin bearing joint must be at 5 degrees at either location. (D) Distance between center of bearings ... 243.71 0.05 mm (9.595 0.001 inch) (E) Bore in the bearing for the crankshaft journal ... 76.180 0.020 mm (2.9992 0.0008 inch) (2) Etch the cylinder number on the connecting rod and the cap in this location. Mark the connecting rod and the cap with a number "1" through "6". Mark the numbers on the same side of the connecting rod as the bearing tab slots. (3) Tighten the connecting rod bolts. Use the instructions that follow.
Before installing the connecting rod bolts, lubricate the bolt threads and the seating faces of the caps with 6V-4876 Lubricant .
Tighten the bolts to the following torque. 41 4 N m (30 3 lb ft)
Place an alignment mark on each cap and each bolt head.
Tighten each bolt for an additional 90 5 degrees (1/4 of a turn). (F) Bore in the connecting rod for the bearing for the crankshaft connecting rod journal ... 82.550 0.013 mm (3.2500 0.0005 inch)The clearance between the bearing and a new crankshaft ... 0.076 to 0.168 mm (0.0025 to 0.0066 inch)The maximum permissible clearance between the bearing and a worn crankshaft ... 0.25 mm (0.010 inch)Note: Bearings are available in smaller sizes which are smaller by the following dimensions: 0.25 mm (0.010 inch), 0.51 mm (0.020 inch) and 0.76 mm (0.030 inch).