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Home›Repair guides›Piston and Connecting Rod Removal

Yanmar — Piston and Connecting Rod Removal

A Yanmar service procedure — check it applies to your exact model before use.

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Before you start

  • Take care not to damage the inner surface of the cylinder
  • Make sure that cap No. of connecting rod agrees with cylinder No.
  • Take care not to let crankpin metal fall when removing connecting rod crankpin side cap

Procedure

  1. Remove crankpin side cap of the connecting rod.
  2. While turning crankshaft, place piston in the bottom dead center (BDC).
  3. Before extracting piston, remove carbon deposits from the upper wall of the cylinder using fine sandpaper.
  4. Extract the piston/connecting rod assembly while tapping the connecting rod at the large end with the handle of a plastic hammer.

Tools required

  • Plastic hammer

Source: manual:TNE-Series_ServiceManual_2TNE68-4TNE84_EN.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.