|Posted: September 12 2007 at 22:59 | IP Logged
Hi Emory and Oltra,
Emory is right the cored decks can be a very serious problem. Failure doesn't occur often but it can be a mess when it does. There is one Connie in my area that had cored deck failure. It was repaired but even after repair it looks like hell. Connie decks are particularly prone to core failure because due to an error in the deck design water puddles on the decks rather than running off as it should. Connies list to port due to the fact that the generator is off center and not compensated by other weights. It's not obvious but anyone who observes carefully will see it. Because of the list most of the puddling occurs on the starboard deck.
I have found that by keeping the starboard saddle tank full while the port is half full corrects the list. Fuel burns off evenly so by the time the port tank is empty the starboard tank will still be half full and the list is still corrected. The net effect is to reduce you saddle tank capacity to 100 gallons total from 200 gallons. But we rarely need all the fuel capacity anyway. By eliminating the list, most of the puddling is also eliminated.
I've been rebedding my stanchions for some time now but the rebedding doesn't seem to last very long. What type of caulk do you suggest Emory?
As Emory states, the biggest question mark is the condition of the engines. A detailed diesel engine survey is essential. Good engine surveys are expensive but worth every penny.
From my own experience if the risers are cast iron and have not been replaced in the last seven years replace them immediately. Rubber hoses on a 20 year old boat are ticking time bombs that can sink her. If you can't verify that the hoses have been replaced in the last ten years replace them immediately.
At $3200 per hole 12 cylinders will cost you $38,400 for an in-frame overhaul and accessories can easily bump that by $20K to $58,400 especially if some of your components cannot be rebuilt. In that case you will encounter large core charges.
On Connies all of the thru hull strainers (except the main engine intakes) were attached to their hoses with red brass nipples. Red brass doesn't dezincify but it does not have the same galvanic pontential as the bronze strainers and will corrode when attached to them. There are three head intakes, an air conditioning intake and a generator intake. That's five strainers with two nipples per strainer or 10 nipples in all. Any one of them can fail and sink your boat. I've removed three strainers so far and seen serious corrosion in all 6 nipples. My air conditioner's strainer fell off due to corrosion of one the brass nipples. Use the bronze hose adapters made by Groco to replace them. While you are at it you should probably replace the hoses too. The corrosion tends to be greater as the flow increases so expect your generator and air conditioner to fail first. Your head have less flow so the red brass nipples will last longer. Corrosion is serious. If you value your boat replace those red brass nipples.
Since I have kept my boat under cover since I bought her (the last 13 years) I can't comment on dry rot or window leak problems. I don't seem to have any.
I've done a fair amount of study into the longevity of Detroit 6V92s. They start to have major problems as early as 800 hours. I attribute these failures due to infant mortality and major abuse by the owners. By 1600 hours about half of the engines have had major overhauls. And by 2400 hours most have had major overhauls. A few lucky specimens may last to 3000 hours and the absolute maximum I have ever seen is 3400 hours. But that 3400 hour specimen couldn't be verified.
A very rough estimate would be a straight line decline with about 1/4 failing at or before 750 hours, a half failing at or before 1500 hours 3/4 failing by 2250 hours and all failing by 3000 hours. For a typical 75 hour per year boat that would mean 1/4 by 10 years, 1/2 by 20 years, 3/4 by 30 years and all by 40 years. But frankly I'm dubious about any of them lasting beyond 30 years. We just don't have data to take aging as well as wear into account.
If you have replaced the standard two door fridge, Emory, please tell us how you did it. I haven't had to do it yet but dred the time that it happens. I'm hoping that replacing the compressors will make it last another 15 years which is plenty for me. After that the next owner can worry about it.
On the subject of restoring shine to the hull, a standard boat yard buffing just doesn't do it. The results last for a while but just don't endure. However, that subject is just too complex to discuss here. There, I've used the word "just" three times in three sentences. My grammar teacher would give me a "C" on that paragraph.
I've replaced the water heater once already without any sweat but hope I don't have to do it a second time.
Don't let these problems overly scare you. Most of them are the same type of problems that you will encounter with any boat you buy.
Edited by Pete37 on September 13 2007 at 01:14
A Murray Chris Craft Constellation 500