LOCKNUT-BEARING 1T1771 - Caterpillar

Illustration 1 g02572956
Table 1
Specification for 283-0246 Piston and Rod Gp, 312-8841 Piston and Rod Gp, and 310-6962 Piston and Rod Gp
Item Qty Part Specification Description
1 1 Crown As Bore in the bushing of the crown assembly for new piston pin is 70.0525 0.0075 mm (2.75796 0.00030 inch).
Measure the piston pin bore in the bushings in two places for each bushing in a vertical direction.
2 1 155-5271 Piston Skirt Bore in the piston skirt for new piston pin is 69.988 0.005 mm (2.7554 0.0002 inch).
Measure the piston pin bore in a vertical direction.
3 1 229-1632 Top Piston Ring Install the top piston ring with the "UP-1" side toward the top of the piston.
Width of groove in new piston for the top piston ring is 4.219 mm (0.1661 inch).
Thickness of new top piston ring is 4.5 mm (0.18 inch).
When the top piston ring is installed in a cylinder liner bore of 170 mm (6.7 inch), the clearance between the ends of the piston ring is 0.625 0.125 mm (0.0246 0.0049 inch).
Increase in clearance between the ends of the piston ring for each 0.03 mm (0.001 inch), increase in the cylinder liner bore is 0.08 mm (0.003 inch).
4 1 144-5695 Intermediate Piston Ring Install the intermediate piston ring with the "UP-2" side toward the top of the piston.
Width of groove in new piston for the intermediate piston ring is 3.514 mm (0.1384 inch).
Thickness of new intermediate piston ring is 3.785 mm (0.1490 inch).
When the intermediate piston ring is installed in a cylinder liner bore of 170 mm (6.7 inch), the clearance between the ends of the piston ring is 1.00 0.15 mm (0.039 0.006 inch).