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Yanmar — Inspect and repair.

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

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Procedure

  1. Bearing seizure e Insufficient lubrication or clogged lubrication piping e Excessively high oil temperature e Unbalanced rotating part e Insufficient warming up or sudden stop from loaded operation (no-load operation)
  2. Contact or breakdown of turbine wheel or compressor impeller « Over speed « Excessive exhaust temperature rise e Foreign matter invasion e Worn bearing e Faulty assembly

Source: manual:Yanmar-6LP-DTE-Service.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.