340da Hot water tank?

[Searay-Bob]

I have a seaward hot water tank in my 89 DA and I notice that the hoses on the port side are cut off:smt021 i do have the gray plastic pipe hooked up for the cold inlet and the hot outlet. Where do the other 2 hoses go. What size is it and how long? I am picking away at this boat that I got last fall and we are almost in the water.:thumbsup:
Thanks
Bob

 

[lime4x4]

Rubber hoses?? I have 2 5/8 heater hoses that come off my engine to the hot water heater to heat the water

 

[chumbley]

I suspect they are for the hot water off of the engine for the heat exchanger, as lime4x4 stated. If they are cut off - they were probably bypassed for a reason. So be sure change check for leaks when you hook them back up.

 

[Searay-Bob]

Yes they were cut maybe they burned out the element? But why are there 2 of them and where do they go on the engine? I don't see anywhere where they were hooked up?:smt101
Bob

 

[chumbley]

The hot water heaters use either electricity (the element) or hot water heat exchanger from the engines. Separate things. The element could be non-functional, and you could still get hot water from the heat exchanger (if it was hooked up). And vis-versa.

Not sure where exactly they go on the engine. If you don't see anywhere, then perhaps the boat was re-powered and they left this off? They will likely plumb in just like the heater core in a car. Same concept. Circulate part of the water flow from the engine cooling out the 5/8" hoses for another purpose and return it back to the system.

I can look on my 2000 340 next time I'm at the boat, if nobody else jumps in.

 

[lime4x4]

Mine was tied into the big hose that comes off the water pump and then at a fitting by the thermostat housing

 

[stevea661]

On my 5.7 one end goes into the water pump. if the pump was replaced, the new pump comes plugged. The plug is removed and a 1/2" ips nipple is installed, the 5/8 hose slides over it, to heater. The other side goes into the top of the intake manifold, from the manifold to the hose is 1/2" street 90, 1/2 x 6 nipple, 1/2" tee with nipple on the run and temp sensor on the branch, hose over 1/2" nipple to heater. Hope this helps.

 

[KRB64]

The other side goes into the top of the intake manifold, from the manifold to the hose is 1/2" street 90, 1/2 x 6 nipple, 1/2" tee with nipple on the run and temp sensor on the branch, hose over 1/2" nipple to heater. Hope this helps.

So if I'm following you correctly, it goes into the intake where the temp sensor is?

 

[stevea661]

So if I'm following you correctly, it goes into the intake where the temp sensor is?

Correct

 

[KRB64]

Cool. Ours was unconnected too when we got her. Not sure if it was never hooked up or disconnected because it leaked or...

May re-plumb and see what happens...

 

[Daniel P Thomas]

Here are a couple of pictures.
The first two show the hoses on the starbord engine.
One black and one blue on mine.
The third picture is of the port engine by-pass
Dan