How long does it take for water
to get hot? Does it ever get hot? Do you need to be under way? can you just idle at anchor
reaches 180F at anchor
idling. I've tried numerous plumbing
options with water heater (6 Gal Seward products), none of which are satisfactory. Here is what I tried and my findings:
Option 1: Use Ports
recommended by manufacturer, the ones in the head
to feed the waterheater. One behind thermostat housing and one to the left of the thermostat housing. Observation was that at water heater inlet, hose does not get warm to the touch. Seems like there is air trapped and adding antifreeze
via radiator cap on the exhaust
manifold does not help. Also seems like there is barely any flow of antifreeze
in this loop. Most of it goes via the 1-1/4" loop and the heat exchanger
. Result was 2 hours at idle with no hot water.
Option 2: Tee off 1-1/4" heater hose between exhaust
manifold and heat exchanger
with 1-1/4"x1-1/4" x 5/8" copper barb tee fitting, feed the 5/8" hose to water heater. Feed 5/8" output of waterheater back to the block inlet just below alternator
via another 1-1/4"x1-1/4"x5/8" tee.
10 hours of motoring and water was not warm. There seems to be no flow of hot antifreeze via the 5/8" route
. All the antifreeze goes via heat exchanger and 1-1/4" route
option 3. Use oil
cooler to make another antifreeze loop between water heater, oil
cooler and use separate jabsco
pump to circulate antifreeze. Idea came from seeing how hot oil filter
and oil hoses get. So far I got water to be luke warm after 2 hours at idle. Doesn't seem like oil has enough heat capacity to heat the water that way in reasonable time.
I am new to diesels so therefore the experimentation. But with my old atomic 4, I plumbed water heater directly inline between exhaust manifold and heat exchanger forcing all of antifreeze through waterheater and water was scorching hot after 1/2 hour of idling. This is not an option with diesel
as that loop is 1-1/4" ID and water heater is 5/8".