BEARING KIT 8N2225 - Caterpillar

Assembly Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 4C-3601 Piston Ring Expander 1
B 208-7630 Piston Ring Groove Gauge 1
Verify correct assembly of the pistons and the connecting rods. Ensure that the etched numbers on the rod and the rod cap are in the correct positions. The etched number on the rod and the rod cap correspond to the cylinder in which it should be installed.
Note: The word "FRONT" may be stamped on the pistons in some engines. Ensure that the word "FRONT" is toward the front of the engine when the piston is installed. The etched number on the connecting rod must be on the right side of the engine in the corresponding cylinder. Ensure that the piston and the etched number are correctly positioned.Note: Inspect condition of all piston ring grooves. Use Tooling (B) to verify diameter of top ring groove. Refer to Tool Operating Manual, NEHS0840 for additional information.
Illustration 1 g01319591Note: Ensure that new bearing (4) is installed prior to assembly of the piston.Note: Careful handling is required for fractured connecting rods. Fractured faces for the connecting rod and connecting rod cap should not be placed on any surface. The connecting rod and the connecting rod cap should be placed on the sides in order to prevent damage. When possible, the connecting rod and the connecting rod cap should be bolted together in order to prevent damage.
Place piston (2) on connecting rod (5). Apply clean engine oil to piston pin (6) and install the piston pin.
Install retaining rings (3).
Check the clearance between the ends of piston rings (1). Refer to Specifications, "Piston and Rings". Note: The oil ring must be installed over the spring with the end gap 180 degrees from the oil ring spring joint.
Install the oil control piston ring. The ends of the spring should be rotated 180 degrees from the ring end gap.
Install the intermediate piston ring with the side marked "UP-2" toward the top of the piston. Use Tooling (A) in order to install the ring.
Install the top piston ring with the side marked "UP-1" toward the top of the piston. Use Tooling (A) in order to install the ring.
After installation, all three of the piston rings should be placed 120 degrees away from each other. End By:
Install the pistons and the connecting rods.