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Liner Flange Underside Grinding

The flatness of the liner flange underside, the face with which the liner seats on the engine block, lost to wear, corrosion or pitting, is restored by grinding.

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The liner seats on the block with the underside of its flange. If this face is damaged the liner does not seat evenly; the seal is lost and the flange is stressed locally. The work is done in the workshop and, on request, can also be done on board.

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When It Is Needed

  • When cooling water or gas leaks past the liner flange
  • When corrosion or pitting is found on the flange underside with the liner out

Scope and Limits

  • It does not repair a cracked liner flange.
  • The seating face in the block is a separate service.
  • The effect of the removed material on liner height is compensated per the engine maker's instructions; we do not supply liners or adjusting parts.

Process Steps

  1. 1

    The liner is removed and the flange underside is checked for pitting, unevenness and burrs.

  2. 2

    Flatness and parallelism are measured with a dial gauge and a straight edge.

  3. 3

    The grinding rig is fitted to the liner and set parallel to the face.

  4. 4

    The face is ground until flatness is restored.

  5. 5

    Flatness is measured again, grinding residue is cleaned away and the liner is refitted.

Frequently Asked Questions

How does it differ from grinding the liner seating face in the block?

Even seating depends on two faces: the seating face in the block and the underside of the liner flange. This service trues the liner's own face; the block face is trued in a separate service.

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Tell us the engine make and model, the damage and where the vessel is; we will review it and get back to you.

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