C9 Engines for Caterpillar Built Machines Piston and Rings Caterpillar


Piston and Rings
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Illustration 1g06024074

Table 1
Specification for 188-9141 Piston and Rod Gp 
Item  Qty  Part  Specification Description 
Install the rod and piston group in the engine with the part number of the forging for the rod assembly to the rear of the engine. The rear of the engine is the flywheel end of the engine. Lubricate the rod and piston group with clean engine oil before you insert the rod and piston group into the block. 
197-9299 Piston Ring  Install the top piston ring with the side marked "UP-1" toward top of the piston. The black colored stripe faces to the right of the ring end gap. 
When the new top piston ring is installed in a cylinder liner bore with bore size of 112.025 ± 0.025 mm (4.4104 ± 0.0010 inch), the clearance between the ends of the piston ring is 0.40 ± 0.10 mm (0.016 ± 0.004 inch).
Thickness is 2.935 mm (0.1156 inch).
161-3425 Piston Ring  Install the intermediate piston ring with the side marked "UP-2" toward top of the piston. The purple colored stripe faces to the right of the piston ring end gap. 
When the new top piston ring is installed in a cylinder liner bore with bore size of 112.025 ± 0.025 mm (4.4104 ± 0.0010 inch), the clearance between the ends of the piston ring is 0.60 ± 0.10 mm (0.024 ± 0.004 inch).
Width of groove in 197-9297 Piston Crown As for intermediate piston ring is 3.060 ± 0.010 mm (0.1205 ± 0.0004 inch).
Thickness is 2.980 ± 0.010 mm (0.1173 ± 0.0004 inch).
168-7209 Piston Ring  The oil control piston ring has a spring that is installed with the ring. The gap in the spring should be a distance of 180 degrees from the ring end gap when the oil control piston ring is assembled. The blue colored stripe faces to the right of the ring end gap. 
When the new top piston ring is installed in a cylinder liner bore with bore size of 112.025 ± 0.025 mm (4.4104 ± 0.0010 inch), the clearance between the ends of the piston ring is 0.45 ± 0.15 mm (0.018 ± 0.006 inch).
Width of groove in 197-9297 Piston Crown As for oil control piston ring is 4.030 ± 0.010 mm (0.1587 ± 0.0004 inch).
Thickness is 3.980 ± 0.010 mm (0.1567 ± 0.0004 inch).
After the piston rings have been installed, rotate the piston rings so that the end gaps are 120 degrees from each other. 
Thoroughly lubricate the entire piston in zone (A) prior to assembly into the cylinder block with clean engine oil. 
166-3648 Piston Pin  Thoroughly lubricate the piston pin with clean engine oil prior to assembly. 
Outside diameter is 46.000 ± 0.005 mm (1.8110 ± 0.0002 inch).
Inside diameter is 20.5 ± 0.5 mm (0.81 ± 0.02 inch).
Length is 91.50 ± 0.15 mm (3.602 ± 0.006 inch).

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