The hoses that go off to the water heater on my 87 CD 30 MK ll come
off of a insert with an outlet to and a inlet from the water heater. the insert is in the hose that comes from the "exhaust" heat exchanger and goes to the seawater heat exchanger. the problem is (I think) that the hot engine water is taking the path of least resistance and not" turning" to head up the the hot water heater and
going straight thru to the seawater heat exchanger.
Question is ...is this correct?
seems the water should be forced to go to the water heater from the
exhaust heatexchanger thru the heater and out to the seawater heat exchanger.
Thanks in advance..... hello Jon Larson, how are you!
laustin@us.ibm.com
CD 30 MKll water heater ???
Moderator: Jim Walsh
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Steve Alarcon
Re: CD 30 MKll water heater ???
Larry,
You don't indicate which motor or heat exchanger setup you have, and that could be helpful in understanding your situation. But it does sound like your system is "hosed up" (pun intended)!
Lets start with an explanation. I suspect that your engine is cooled with "fresh" water (do you use antifreeze?) and your engine exhaust system is cooled with salt water. To dissipate the heat carried in the fresh water that is generated by the engine, the fresh water runs through the water heater (imagine that there is a metal hose that is just laying in a tub of cold water and the hot water is running through the hose, thereby heating up the cold water) and then through a radiator that has a sleeve around it (this is called a heat exchanger). Between the sleeve and the radiator "core" is salt water. This salt water is pumped through this "sleeve" and then dumped over the side via the exhaust pipe (this helps to keep the exhaust pipe cool, and also quiets the exhaust sound.
So, the engine water does't really have any choice as to which way it goes. (technical exception note, there is a very small vent in the thermostat housing that allows a continous flow of salt water into the exhaust system when the thermostat is closed). I suspect that your problem is more likley to be found in the water heater; perhaps a clogged line?
Hope this helps. Send me a note if I need to clarify something I wrote.
Steve Alarcon
CD30 Temerity
Seattle
steve.alarcon@attws.com
You don't indicate which motor or heat exchanger setup you have, and that could be helpful in understanding your situation. But it does sound like your system is "hosed up" (pun intended)!
Lets start with an explanation. I suspect that your engine is cooled with "fresh" water (do you use antifreeze?) and your engine exhaust system is cooled with salt water. To dissipate the heat carried in the fresh water that is generated by the engine, the fresh water runs through the water heater (imagine that there is a metal hose that is just laying in a tub of cold water and the hot water is running through the hose, thereby heating up the cold water) and then through a radiator that has a sleeve around it (this is called a heat exchanger). Between the sleeve and the radiator "core" is salt water. This salt water is pumped through this "sleeve" and then dumped over the side via the exhaust pipe (this helps to keep the exhaust pipe cool, and also quiets the exhaust sound.
So, the engine water does't really have any choice as to which way it goes. (technical exception note, there is a very small vent in the thermostat housing that allows a continous flow of salt water into the exhaust system when the thermostat is closed). I suspect that your problem is more likley to be found in the water heater; perhaps a clogged line?
Hope this helps. Send me a note if I need to clarify something I wrote.
Steve Alarcon
CD30 Temerity
Seattle
steve.alarcon@attws.com
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Larry Austin
Re: CD 30 MKll water heater ???
I have hot water! I had called Hansen Marine, a Westerbeke Dealer,Steve Alarcon wrote: Larry,
You don't indicate which motor or heat exchanger setup you have, and that could be helpful in understanding your situation. But it does sound like your system is "hosed up" (pun intended)!
Lets start with an explanation. I suspect that your engine is cooled with "fresh" water (do you use antifreeze?) and your engine exhaust system is cooled with salt water. To dissipate the heat carried in the fresh water that is generated by the engine, the fresh water runs through the water heater (imagine that there is a metal hose that is just laying in a tub of cold water and the hot water is running through the hose, thereby heating up the cold water) and then through a radiator that has a sleeve around it (this is called a heat exchanger). Between the sleeve and the radiator "core" is salt water. This salt water is pumped through this "sleeve" and then dumped over the side via the exhaust pipe (this helps to keep the exhaust pipe cool, and also quiets the exhaust sound.
So, the engine water does't really have any choice as to which way it goes. (technical exception note, there is a very small vent in the thermostat housing that allows a continous flow of salt water into the exhaust system when the thermostat is closed). I suspect that your problem is more likley to be found in the water heater; perhaps a clogged line?
Hope this helps. Send me a note if I need to clarify something I wrote.
Steve Alarcon
CD30 Temerity
Seattle
and they said check for clogged hoses ect. They called back yesterday
(impressed by there service..john in service stays with ya untill the
problem is fixed!) anyway, he said on some Sabers where the water heater may be higher than the engine that they put a freeze plug in
the middle of the aluminum tube (tube with fittings "to & from") water
heater to force the engine coolant thru the water heater.
I have hot water& engine runs at the same temp!
By the way it's a 21 HP westerbeke. Fresh water cooled. no fitting off the heat exchanger( except where salt water exits into exhust) Hansen said sounds like a W21a
Thanks for your help Steve.
Larry CD 30 MKll "Mariah" Milford CT
laustin@us.ibm.com