1300 02 044 0.25 mm Piston & Liner Shim

What does a piston & liner shim do?

This precision-engineered shim is a critical component used to adjust the liner protrusion within heavy-duty diesel engine assemblies. By providing a specific thickness, it ensures that the cylinder liner sits at the exact height required to maintain a balanced clamping load on the head gasket, preventing potential gas leaks or repeat gasket failures.

Technical specifications and fitment

This specific model features an outside diameter of 146.10 mm and an inside diameter of 141.10 mm with a thickness of 0.25 mm. It is manufactured from high-strength components designed to maintain dimensional stability under extreme heat and chemical exposure from oil and coolant.

Installation and maintenance guidance

For successful installation, technicians should ensure all surfaces are thoroughly cleaned of residue or corrosion before fitting the shim. It is vital to measure each cylinder individually, as block wear can vary, and always use a single shim of the correct grade rather than stacking multiple thin layers to achieve the desired height.

Troubleshooting and selection

Regular inspection of the liner protrusion during engine overhauls is essential to prevent improper combustion or coolant contamination. Always follow the manufacturer's specific torque sequences and values when reassembling the cylinder head to ensure the shim performs its function correctly.