C3.4B Engines for Caterpillar Built Machines Piston Ring Groove - Inspect Caterpillar


Piston Ring Groove - Inspect
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C3.4B Engines for Caterpillar Built Machines [UENR0649]
1.1. Inspect the Piston and the Piston Rings
2.1. Inspect the Clearance of the Piston Ring
3.1. Inspect the Piston Ring End Gap

Table 1
Required Tools 
Tool  Part Number  Part Description  Qty 
A  8H-8581  Feeler Gauge 

Inspect the Piston and the Piston Rings

  1. Check the piston for wear and other damage.

  2. Check that the piston rings are free to move in the grooves and that the rings are not broken.

Inspect the Clearance of the Piston Ring

  1. Remove the piston rings (2). Refer to Disassembly and Assembly, "Pistons and Connecting Rods - Disassemble" for the correct procedure. Clean the grooves (1) and the piston rings (2).


    Illustration 1g01200845
    Typical example
    (A) Feeler gauge
    (1) Piston grooves
    (2) Piston ring

  2. Install new piston rings (2) in the piston grooves (1). Refer to Disassembly and Assembly Manual, "Pistons and Connecting Rods - Assemble" for the correct procedure.

  3. Check the clearance for the piston ring by placing Tooling (A) between piston groove (1) and the top of piston ring (2) for the intermediate ring and the oil control ring. Refer to Specifications, "Piston and Rings" for the dimensions.

Inspect the Piston Ring End Gap



    Illustration 2g01344283
    (A) Feeler Gauge
    (2) Piston ring
    (3) Cylinder ring ridge

  1. Clean all carbon from the top of the cylinder bores.

  2. Place each piston ring (2) in the cylinder bore just below the cylinder ring ridge (3).

  3. Use Tooling (A) to measure piston ring end gap. Refer to Specifications, "Piston and Rings" for the dimensions.

    Note: The coil spring must be removed from the oil control ring before the gap of the oil control ring is measured.

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