3116 and 3126 Truck Engines Pistons and Connecting Rods – Assemble

Assembly Procedure

Illustration 1 g00610428

1.Check the clearance between the ends of piston rings (5). Refer to 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.

2.Install the oil control piston ring with Tooling (A). The ends of the spring should be rotated 180 degrees from the ring end gap.

3.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.

4.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.

5.Replace rod bearing (6) by pressing a new bearing into the connecting rod. Refer to Special Instruction, SEHS7295 for the correct tooling and the correct installation procedure.


6.The piston is a two-piece assembly. This piston consists of piston crown (7) and piston skirt (8). Inspect bearing (9) in the piston crown (7). The piston crown must be replaced if the piston crown is worn or damaged. Bearing (9) is nonserviceable.


7.Position piston (1) on connecting rod (3). Coat pin (4) with clean engine oil and install pin (4). Use Tooling (B) to install the retaining rings. Ensure that the retainer rings are in the grooves of piston (1) .
End By: Install the pistons and the connecting rods. Refer to Disassembly and Assembly, “Piston and Connecting Rods – Install”.

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