Join Date: Feb 2010
Location: Narragansett Bay
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Re: Yanmar head gasket replacement as preventive maintenance?
That would be serious overkill and I will second the oil analysis suggestion too.
Maybe I would do so, if another issue required me to strip it down close to that far anyway. To do properly, you may need to mill the surface of the head or the new gasket might not seat properly and cause the leak you're trying to prevent. Not a straightforward job, nor one typically done as a prophylactic.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.