Join Date: Feb 2010
Location: Narragansett Bay
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Re: [Video] Will my 40 year old diesel start?
Once those new valves are underwater, they'll be under pressure, which may identify more weakness. I am a bit surprised you had any leaks. Your idea to plug from the outside can theoretically be done in the water too. I think I would only want to do so, with someone out there monitoring it. Not pound one in and then go back aboard and pull the valve. But it could avoid another trip to the lift.
Another thought would be to add a good pipe dope. I think that does better than teflon tape anyway. Also, the yellow teflon tape (max density) is much better. Some use both at the same time. Hopefully they held just fine.
You noted you ran the cooling water dry. Probably didn't matter, but I worry about impellers if run dry for any amount of time. I've had them look just fine, but fail shortly thereafter, at the worst possible time.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.