Join Date: Feb 2010
Location: Narragansett Bay
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Re: Installing new engine
Rock, please. Defending a 25 year old impeller, by suggesting hose replacement intervals are just like main seals is making up a defense. Even if the main seal did fail and leak oil, you'd easily get back to the slip. The burst hose will cause some degree of damage and render the engine inoperative.
In my book, waiting for an impeller to fail prior to replacement makes zero sense, regardless of manufacture recommendations. First, you can overheat and cause damage. Second, the failure usually throws bits of the impeller into the heat exchanger. I would hope anyone could intuitively get their head around the difference between a wet impeller in constant use, which routinely puts the bent vanes in different positions, from a dry impeller sitting in the same position for ten years. That 10 year bent vane won't even initially extend to create a seal.
Sorry you're so sensitive over standard best practice. However, you did attack the best practice advice, rather than simply provide your own input. It's also well known that hoses can/will fail, without visual external warning, if you could even see every side of every hose anyway, including the inside.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.