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Yanmar 2GM20 - common oil leak problems?


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Returned from a short jaunt to Waiheke this afternoon and found about 100ml of engine oil in the bilges.

The engine is running fine, starts easy etc, no unusual banging and knocking, no smoke or other signs of distress, so I am assuming its going to be something simple that has failed (crankshaft seal or similar) not something catastrophic.

Access requires the usual training as a muscular gynecologist with contortionist tendancies, so before I dive in has anyone got knowledge of a "common issue" to start me off on diagnosis?

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Oil lines on 3GM30 are steel and external. My were pitted and leaked so I replace both sides. Common problem.

Rather spendy from Yanmar, but new ones are  Cu I believe.

 Feeds valve train. Rather than internal galleries. I presume the 2GM is the same.

I had to remove quite a bit of gear to facilitate. But then was repainting as well so didn't matter.

Get spare Cu banjo washers.

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I assume the dipstick tube is connected to a Banjo bolt screwed into the bottom of the sump (the drain plug in industrial applications). If this is the case that would be the first place to check - maybe a failed washer. If an oil circulation pipe has failed you would expect to see a spray stain from it

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