BOLT-12 POINT HEAD 7V6406 - Caterpillar

Illustration 1 g02573156
Illustration 2 g02573158
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(3) Location pin for correct installation of connecting rod caps
Table 1
Specification for 257-4281 Rod As
Item Qty Part Specification Description
A - - Angle above the centerline on either side of the bushing joint for bushing for the piston pin is 10 degrees.
B - - The connecting rod must be heated prior to installation of the bushing for the piston pin. Do not use a torch to heat the connecting rod.
The connecting rod may be heated from 175 to 260 °C (347 to 500 °F) for the installation of the bushing for the piston pin. Minimum length for heating the connecting rod is 105 mm (4.1 inch).
C 1 118-1655 Bushing Thoroughly lubricate the piston pin with clean engine oil prior to assembly of the piston and the connecting rod.
Bore in the bushing for the piston pin after installation is 70.000 0.008 mm (2.7559 0.0003 inch).
Bore in the connecting rod for the bushing for the piston pin is 75.760 0.015 mm (2.9827 0.0006 inch).
D - - Distance between the center is 392.5 mm (15.45 inch).
E 1 7N-2043 Dowel Protrusion of the dowel from the connecting rod cap is 4.0 0.5 mm (0.16 0.02 inch).
F - - Bore in the connecting rod for the bearing for the crankshaft connecting rod journal after applying final torque to the connecting rod bolts is 143.028 0.015 mm (5.6310 0.0006 inch).
G - - Bore in the connecting rod bushing for crankshaft is 135.133 to 135.194 mm (5.3202 to 5.3226 inch).
Clearance between bearing and new crankshaft is 0.107 to 0.218 mm (0.0042 to 0.0086 inch).
1 - - Etch the cylinder number on the connecting rod and the cap in this location. Mark the connecting rod and the cap with numbers. Mark the numbers on the same side of the connecting rod as the bearing retainer notch.
Install the connecting rod in the engine with the part number to the rear of the engine.
2 - - The chamfer side must be next to the crank pin thrust surface when the connecting rod and piston group is assembled in the engine.
- 4 7N-2405 Bolt Use the following procedure for tightening the connecting rod bolts:
Bolt 1 and bolt 2 must be on the same end of the connecting rod cap that has bearing tabs and location pin (3).
1. Before assembly, apply Molylube to the bolt threads, the bolt shank, and the bolt seat.
2. Sequentially tighten the bolt 1 and bolt 2 to 90 5 N m (66 4 lb ft).
3. Sequentially tighten the bolt 3 and bolt 4 to 90 5 N m (66 4 lb ft).
4. Sequentially again, tighten the bolt 3 and bolt 4 to 90 5 N m (66 4 lb ft).
5. Tighten each bolt for an additional 90 5 degrees.