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Yanmar — Repair the pipe to the normal operating

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

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Procedure

  1. Oil flows to the compressor or turbine side due to clogged oil return pipe.
  2. Abnormal wear or breakage of seal ring by excessive wear of bearing

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.