KIT (SEAL) 8U4083 - Caterpillar

Illustration 1 g03103876
Table 1
Specification for 371-0823 Piston
Item Qty Part Specification Description
Before assembly of the piston rings, lubricate the ring grooves with clean engine oil. After assembly, lubricate the mating surfaces of the rings to the cylinder liner with clean engine oil.
1 1 214-6066 Top Piston Ring Install the top piston ring with the "UP-1" side towards the top of the piston.
When the new top piston ring is installed in a cylinder liner, the clearance between the ends of the piston ring is 0.625 0.125 mm (0.0246 0.0049 inch).
Thickness of new top piston ring is 3.88 mm (0.153 inch).
2 1 144-5695 Intermediate Piston Ring Install the intermediate piston ring with the "UP-2" side towards the top of the piston.
When the new intermediate piston ring is installed in a cylinder liner, the clearance between the ends of the piston ring is 1.00 0.15 mm (0.039 0.006 inch).
Thickness of intermediate piston ring is 3.785 mm (0.1490 inch).
3 1 223-6361 Oil Control Piston Ring The ends of the oil control piston ring should be a distance of 180 degrees from the ring end gap when the oil control piston ring is assembled.
Width of groove in new piston for the oil control piston ring is 4.04 mm to 4.07 mm (0.159 to 0.160 inch).
Thickness of oil Control piston ring is 3.97 to 3.99 mm (0.156 to 0.157 inch).
When the new oil control piston ring is installed in a cylinder liner, the clearance between the ends of the piston ring is 0.5 mm to 0.8 mm (0.02 to 0.03 inch).
- - - After the piston rings have been installed, rotate the piston rings so that the end gaps are 120 degrees from each other.
4 2 253-1238 Pin Retainer Assemble the pin retainer with the gap towards the top of the piston.
Thickness is 2.36 0.08 mm (0.093 0.003 inch).
5 1 263-8955 Piston Pin Before assembly, lubricate the piston pin, the piston pin bore, the connecting rod eye, and the connecting rod pin bearing with clean engine oil.
Outside diameter is 69.930 0.005 mm (2.7531 0.0002 inch).
Length is 101.7 to 102.0 mm (4.00 to 4.02 inch).
Bore diameter in the piston for the piston pin is 70.0705 0.0075 mm (2.75867 0.00030 inch).