Inboard Diesel Jackshafted Vs. Twins on a Seamark

cc · #1 08-14-2007, 08:34 PM

The boat has a closed cooling system (fresh water cooled), so all I have had to do is run pink antifreeze thru the intake, change the zinc anodes, the oil, filters and wash the air filter. Less than 200 bucks per year. I have a floscan on the boat so I know the fuel burn numbers are right (plus I check it on fill ups before resetting). Speed is by GPS (Furuno Navnet). I repowered another boat I own 3 years ago with a 5.7l bravo1 set up for about 15k. It burned about 10 to 12 gph at cruise (25mph). Haven't used it but a couple of times since I got the TWM with the Yanmar.

Bushwacker · #2 08-14-2007, 09:48 PM

cc - I recently read an article by Dave Pascoe on yachtsurvey.com that Yanmar used to use a heat exchanger with brass tubes in an aluminum casting. Do you know if they have changed that set up to eliminate the potential galvanic corrosion problems?

Snookerd · #3 08-14-2007, 10:29 PM

it looks like the prices of a used diesel boat make a good argument for a "take out" and install in my boat, then swap with a gas motor, then resell the donor boat. any thoughts??

cc · #4 08-15-2007, 06:38 PM

bushwacker: I am not sure about the heat exchanger, I will check and post. I am almost sure it is not aluminum/brass. I think it may be monel.