PIN 6Y3909 - Caterpillar

Illustration 1 g02848796
Table 1
Specification for 341-3639 Piston and Rod Gp
Item Qty Part Specification Description
Thoroughly lubricate the ring grooves of the entire piston with the clean engine oil before installation of the piston rings. After assembly, completely lubricate the mating surfaces of the rings to the cylinder liner with the clean engine oil.
1 1 229-1632 Top Piston Ring Install the piston ring with the "Up-1" side toward the top of the piston.
When the piston ring is installed in a cylinder liner with a bore size 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).
The 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 size is 0.08 mm (0.003 inch).
Thickness of the new top piston ring is 4.5 mm (0.18 inch).
2 1 144-5695 Intermediate Piston Ring Install the piston ring with the "Up-2" side toward the top of the piston.
When the piston ring is installed in a cylinder liner with a bore size 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).
The 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 size is 0.08 mm (0.003 inch).
Thickness of the new intermediate piston ring is 3.785 mm (0.1490 inch).
3 1 165-6668 Oil Control Piston Ring The spring ends of the oil control piston ring should be assembled 180 degrees from the ring end gap.
Thickness of new oil piston ring is 3.980 0.010 mm (0.1567 0.0004 inch).
Clearance between groove and new oil piston ring is 0.050 to 0.100 mm (0.0020 to 0.0039 inch).
When the piston ring is installed in a cylinder liner with a bore size of 170 mm (6.7 inch), the clearance between the ends of the piston ring is 0.65 0.15 mm (0.026 0.006 inch).
The 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 size is 0.08 mm (0.003 inch).
Width of groove in piston for the new oil piston ring is 4.055 0.015 mm (0.1596 0.0006 inch).
After all piston rings have been installed, rotate the piston rings, so that the end gaps are 120 degrees from each other.
4 - - Bore diameter for piston pin is 70.0705 0.0075 mm (2.75867 0.00030 inch).
5 1 302-3451 Piston Pin Before assembly, completely lubricate the piston pin, the piston pin bore, the connecting rod eye, and the connecting rod pin bearing with clean engine oil.
Outside diameter of piston pin is 69.930 0.005 mm (2.7531 0.0002 inch).
Inside diameter of piston pin is 30.5 0.5 mm (1.20 0.02 inch).
Length of piston pin is 101.85 0.15 mm (4.010 0.006 inch).
6 2 253-1238 Pin Retainer Assemble the pin retainer