first off make sure your block/boat is a good hull. (YOU have to get down in it and rip out every old screw sticking out doing nothing, remove any old boxes trash, grandpas tackle 'things' etc!) Clean out the boat with bleach and dawn soap (I mean really scrub and the toilet bowl brush is the best!) check out all your hatches , floors, bulkheads, fiberglass tabbing, etc..! take pics with a digital camera in spots where you can not see! make a list of pumps, wires, wire runs, storage, seacocks, fuel tanks, etc! * Fuel tanks when switching to diesel need a return line! Old boats sometimes just need new tanks. <~~ that was a period! new diesels would incease your fuel range by far and boats that you can be comfortable on are a rare thing now days! you also do not have a flybridge and cabin going 30 out unless it's like a 28 bert. with outboards. you have to deal with exhaust , shaft dimension, raw water, space, (sometimes height gets the most attention!!!) gears ZF are great so are the rest! think about this with some ripping , cleaning, and new power you start at 0 hrs and a lot better fuel even at higher cost per gallon your not gambleing with ethanol! some diesels have high dollar inner-cooler maintenece also beware! be smart and make good choices. know everything there is to know about your rig to repower first and then you will have the answers and bottom line.
Quest,
When I first saw the post all of the incidentals popped into my mind, cut the deck, remove the old engines, measure clearances, clean out and paint the engine room, remove the old harnesses, install new shaft logs, install new drip less shaft seals, modify the exhaust system most likely increasing the size, deal with all of the tank issues and that may only be make accommodations for fuel return lines, Would be good at that point to change the tank, probably a good time to change the generator over to diesel, change the struts to handle the larger diameter shafts, buy a set of new wheels and shafts, rewire all of the new starting and engine monitoring systems, fabricate new engine mounts, make sure there is enough air getting into the engine room so the diesels breathe properly, rebuild the deck and any interior components that had to be removed in order to get the old 454's out.
That's why I originally posted that it's not worth it.
Unless he's going to keep the boat for a long time, it may not be worth the investment.
There are ways to save money, my buddy did a gas to diesel re-power and he takes a small Honda gas generator and lashes it to the forward deck and plugs it into the shore power outlet and that works fine. The darn thing will run almost 8 hours before someone has to put more fuel in it. Not the safest thing in the world at sea but it works.
Last edited by Fortunate One; 09-28-2008 at 09:07 AM.