RING-WEAR 1U2694 - Caterpillar

Assembly Procedure
Table 1
Required Tools    
Tool     Part Number     Part Description     Qty    
A     4C-3601     Piston Ring Expander     1    
C (1)     208-7630     Ring Groove Gauge     1    
( 1 ) Use the tool on the C-12 engine only.
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
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.
Do not use a hard surfaced tool to install plug. Do not strike or impact plug during installation. If the plug is dropped, replace the plug with another new plug.
Note: The word "FRONT" may be stamped on the crown of 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 crown and the etched number are correctly positioned.Note: Inspect condition of all piston ring grooves. Use Tooling (C) in order to verify diameter of top ring groove. Refer to Tool Operating Manual, NEHS0840 for additional information.
Illustration 1 g01062444
Note: Ensure that bearing (6) is in the correct position.
Place piston crown (2) in piston skirt (4). Place the piston assembly on connecting rod (7). Apply clean engine oil to piston pin (5) and install the pin. Install new plug (3) .
Check the clearance between the ends of piston rings (1). See the Specifications Manual, "Pistons and Rings" topic.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. The white colored portion of the spring must be visible at 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 piston rings (1) should be placed 120 degrees away from each other.End By: Install the pistons and the connecting rods. Refer to Disassembly and Assembly, "Pistons and Connecting Rods - Install".