HoyeTractor
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I will conclude by advising you to go with whatever Aaron says. He is by far more educated than me on Yanmars.:thumbsup:
Too bad I apparently told him the wrong thing the first time
With that having a felt in it would it be possible the hole is for lubricating the felt and then in turn the brass bushing.
That actually sounds pretty good. I'll research it a little more tomorrow and see if any of the manuals mention the mystery hole.