OPTION AR-CHAS 3C8122 - Caterpillar

Illustration 1 g01516394
Piston and rod
(1) Piston crown assembly
(5) Piston skirt Thoroughly lubricate the outer surface of the entire piston and the piston rings with clean engine oil before installation in the cylinder block.Top Piston Ring (2)
Install the piston ring with the side marked "UP-1" toward the top of the piston. The blue color stripe and the yellow color stripe must be to the right of the ring end gap.Thickness of new top piston ring ... 3.83 mm (0.151 inch)Clearance between the ends of the piston ring in a cylinder liner bore of 137.16 mm (5.400 inch) ... 0.35 0.05 mm (0.014 0.002 inch)Increase in the clearance between the ends of the piston ring for each 0.03 mm (0.001 inch) increase in the cylinder liner bore ... 0.08 mm (0.003 inch)Intermediate piston ring (3)
Install the piston ring with the side marked "UP-2" toward the top of the piston. The violet color stripe must be to the right of the ring end gap.Width of groove in new piston for the intermediate piston ring ... 3.070 0.010 mm (0.1209 0.0004 inch)Thickness of new intermediate piston ring ... 3.005 0.015 mm (0.1183 0.0006 inch)Clearance between the ends of the piston ring in a cylinder liner bore of 137.16 mm (5.400 inch) ... 0.70 0.10 mm (0.028 0.004 inch)Increase in the clearance between the ends of the piston ring for each 0.03 mm (0.001 inch) increase in the cylinder liner bore ... 0.08 mm (0.003 inch)Oil control ring (4)
The spring ends of the piston ring should be assembled 180 degrees from the ring end gap. The blue color stripe can be to the right or to the left of the ring end gap.Width of groove in new piston for the oil control piston ring ... 4.03 0.01 mm (0.159 0.001 inch)Thickness of new oil control piston ring ... 3.98 0.01 mm (0.157 0.001 inch)Clearance between the groove and the new oil control piston ring ... 0.05 0.02 mm (0.002 0.001 inch)Clearance between the ends of the piston ring in a cylinder liner bore of 137.16 mm (5.400 inch) ... 0.45 0.15 mm (0.018 0.006 inch)Increase in the clearance between the ends of the piston ring for each 0.03 mm (0.001 inch) increase in the cylinder liner bore ... 0.08 mm (0.003 inch)Note: After all of the piston rings have been installed, rotate the piston rings so that the end gaps are separated by 120 degrees.Piston Pin (6)
Diameter of new piston pin ... 59.975 0.005 mm (2.3612 0.0002 inch)Length of the piston pin ... 89.80 0.15 mm (3.535 0.006 inch)Bore in the body of the piston for the piston pin ... 60.0925 0.0075 mm (2.36580 0.00030 inch)Note: Thoroughly lubricate the piston pin with clean engine oil before assembly.