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Eliminating Water Heater from Mercury Engine 7.4 MPI

GAS engine, transmission and generator repair and maintenance discussion forum.
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Mase
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Eliminating Water Heater from Mercury Engine 7.4 MPI

Postby Mase » November 15th, 2019, 9:43 am

Wanted to share the photos and how to eliminate the engine coolant from going through the water heater. My water heater on my Voyager 370 started leaking water and I was not comfortable having the engine coolant go ing through the water heater so I looped the connections on the engine with a piece of 5/8" silicone heater hose that is rated at 350 degrees and high pressure, yes the hose is better than you need but worth the extra 10 bucks.

Left the hoses going to the water heater in case we hook one back up and ran the new hose by the hoses and made sure the new hose was not coming into contact with anything that would rub a hole in it.

Pictures attached.

This also allows us to remove the old water heater and replace with something in the future.
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Re: Eliminating Water Heater from Mercury Engine 7.4 MPI

Postby Viper » November 16th, 2019, 9:38 am

:down:
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Re: Eliminating Water Heater from Mercury Engine 7.4 MPI

Postby bud37 » November 16th, 2019, 5:02 pm

Mase wrote:Source of the post Left the hoses going to the water heater in case we hook one back up and ran the new hose by the hoses and made sure the new hose was not coming into contact with anything that would rub a hole in it.


Looks good, If it were mine I would put new hoses to the new water heater when comes time. Once those old hoses sit dry in the bilge , rot will set in pretty quick.

Good you got the old one out, now could you reinstall a heater of the same size as the old by just reversing things?
"There is nothing - absolutely nothing - half so much worth doing as simply messing about in boats.”
― Kenneth Grahame, The Wind in the Willows

Safe travels with light winds and calm seas.....
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Re: Eliminating Water Heater from Mercury Engine 7.4 MPI

Postby Midnightsun » November 17th, 2019, 5:30 am

Just a tip when you replace your water heater. I found out the prices are considerably less for heaters with integrated serpentines for use with engines. I replaced my water heater with the integrated serpentine even though I do not have this hookup option on my boat. May come in useful for someone in the future.
Cheers, Hans
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