I think I need an RS-232 port in my cerebellum, so I can just download the archives to my brain. I am putting a new vetus 3 cyl diesel in our 1976 Hunter 30'. The new motor is freshwater cooled. The boats hot water heater is missing anyways, so the fresh water cooling makes sense. Hey for a few hundred bucks for a new hot water heater (with heat exchanger)the admiral is happy right? Well now I have to figure out how the exhaust system will work, I read everything I can read and I am still drawing a blank. The exhaust comes out of the motor and goes to a muffler/waterlock, where the exhaust is cooled with water, then maybe to a secondary muffler, through an exhaust hose to a gooseneck, and then out through a transom connector (with check valve0. Did I get that right? Ok, so maybe I am nuts if the motor is freshwater cooled, where does the water in that waterlock come from? Hopefully not the bilge, I am praying that will be dry! Can anyone provide me with a diagram or a web site that will explain the process. I am EXHAUSTED?
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Bob...
If that doesn't help. Give me a call I'll explain it. 404-513-4414 Pat McCartin Inland Marine Diesel Buford, GA imd_ga@hotmail.com
If that doesn't help. Give me a call I'll explain it. 404-513-4414 Pat McCartin Inland Marine Diesel Buford, GA imd_ga@hotmail.com
TWO water circuits
Bob, There are two water circuits. The fresh water circuit is a closed circuit just like on an auto, except that it has a heat exchanger instead of a radiator. The heater is plumbed in just the same way. It has a small water circulating pump on the engine to circulate the fresh water. This is little more than a stirrer and, again is like a car unit. This circuit also has the thermostat. The second circuit is known as the raw water system. It comprises a hull inlet fitting, a strainer, an engine driven water pump which is usually a rubber impeller type and can generate a bit of suction and pressure. This feeds the heat exchanger and then into the exhaust system via the exhaust injection bend. Does this add to the confusion?
Bob, There are two water circuits. The fresh water circuit is a closed circuit just like on an auto, except that it has a heat exchanger instead of a radiator. The heater is plumbed in just the same way. It has a small water circulating pump on the engine to circulate the fresh water. This is little more than a stirrer and, again is like a car unit. This circuit also has the thermostat. The second circuit is known as the raw water system. It comprises a hull inlet fitting, a strainer, an engine driven water pump which is usually a rubber impeller type and can generate a bit of suction and pressure. This feeds the heat exchanger and then into the exhaust system via the exhaust injection bend. Does this add to the confusion?
Usually mixed near the engine!
Bob: As the illustration shows, there is a mixing area directly after the exhaust exits the engine. The exhaust is mixed with RAW water and discharged into the muffler. If you hook up a waterheater to the engine, it needs to be on the fresh water side of the engine before it gets cooled off in the heat exchanger.
Bob: As the illustration shows, there is a mixing area directly after the exhaust exits the engine. The exhaust is mixed with RAW water and discharged into the muffler. If you hook up a waterheater to the engine, it needs to be on the fresh water side of the engine before it gets cooled off in the heat exchanger.
Confusion Gone
No, I understand now, I knew I was missing something, thank you, I think it finally makes sense now. Thanks everyone!
No, I understand now, I knew I was missing something, thank you, I think it finally makes sense now. Thanks everyone!
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