0304380 JOHNSON WASHER,Bow

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).
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).
5 1 165-6668 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. The colored portion of the piston ring must be visible at the ring end gap.
Width of groove in new piston for the oil control piston ring is 4.055 0.015 mm (0.1596 0.0006 inch).
Thickness of new oil control piston ring is 3.980 0.010 mm (0.1567 0.0004 inch).
Clearance between the groove and the new oil control piston ring is 0.050 to 0.100 mm (0.0020 to 0.0039 inch).
When the oil control 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 0.65 0.15 mm (0.026 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 is 0.08 mm (0.003 inch).
- - - After all of the piston rings have been installed, rotate the piston rings so that the end gaps are separated by 120 degrees.
6 1 138-8508 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.
Measure the piston pin diameter on each end in a vertical and horizontal direction.
Outside diameter is 69.962 0.005 mm (2.7544 0.0002 inch).
Length is 137.55 0.15 mm (5.415 0.006 inch).
7 2 8N-7296 Pin Retainer Install the pin retainer with the gap toward the top of the piston.
Thickness is 2.40 0.08 mm (0.094 0.003 inch).
Width of groove in new piston for the pin retainer is 2.75 mm (0.108 inch).