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
- Oil flows to the compressor or turbine side due to clogged oil return pipe.
- 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.