A4420110059 Piston & Liner Shim for Mercedes-Benz

What does a piston & liner shim do?

This piston & liner shim is a critical adjustment component used within the cylinder liner assembly of heavy-duty diesel engines. By being placed between the liner and the engine block, it allows technicians to precisely set the liner protrusion to the required specification. This adjustment is vital for ensuring the correct clamping pressure on the cylinder head gasket, which maintains compression and prevents leaks.

Compatibility and application

This specific component is compatible with Mercedes-Benz engines. It is engineered to withstand the extreme thermal and pressure conditions found in heavy commercial vehicle engines, ensuring long-term stability of the liner seating. This part is essential during engine overhauls or when replacing worn liners to maintain optimal combustion chamber geometry.

Installation and maintenance

When installing this shim, technicians should verify the measured liner protrusion and ensure the mating surfaces are clean and free of debris. The 0.30 mm thickness must be matched exactly to the calculated requirement for the specific engine build to prevent improper gasket seating or excessive protrusion.

Selection guidance

For reliable engine performance, always ensure that the shim thickness aligns with the measured clearance requirements of the cylinder block assembly.

OE cross-reference

1100 02 025 (Piston & Liner Shim) is the equivalent of the Mercedes-Benz OE number. This part directly replaces Mercedes-Benz OE number A4420110059.