ENGINE AR 1N3719 - Caterpillar

Illustration 1 g02687778
Table 1
Specification for 256-9658 Connecting Rod
Item Qty Part Specification Description
Handle the fractured connecting rod with care. Use a soft jawed vise in order to hold the connecting rod when you are loosening the connecting rod cap bolts. Use a soft faced hammer in order to tap the connecting rod cap, if necessary.
A - - Bore in the connecting rod for the 256-9656 Bushing is 54.630 0.013 mm (2.1508 0.0005 inch).
B 1 256-9656 Bushing Bore in the bushing for the piston pin is 50.035 0.008 mm (1.9699 0.0003 inch).
The connecting rod must be heated for the installation of the sleeve bearing. Do not use a torch.
C - - The connecting rod may be heated from 175 to 260 °C (347 to 500 °F) for the installation of the bushing. Maximum distance for heating the connecting rod is 85 mm (3.3 inch).
- - - Thoroughly lubricate the piston pin with clean engine oil prior to assembly of the piston and connecting rod.
1 - - The bearing joint must be within 5 degrees of either location.
D - - Distance between the center of the bushings is 217 mm (8.5 inch).
F - - Bore in the connecting rod for the crankshaft bearing is 85.000 0.013 mm (3.3465 0.0005 inch).
Illustration 2 g02687779
View E-E
Table 2
Specification for 256-9658 Connecting Rod
Item Qty Part Specification Description
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 retainer notch (4).
Install the rod and piston group in the engine with the part number of the forging for the rod assembly to the rear of the engine. The rear of the engine is the flywheel end of the engine. Lubricate the rod and piston group with clean engine oil before you insert the rod and piston group into the block.
3 2 160-8197 Bolt Use the following procedure in order to tighten the bolts:
1. Tighten the bolts to 50 5 N m (37 4 lb ft).
2. Again tighten the bolts to a torque angle of 90 5 degrees.