C 28 Hot Water Heater Isolation From Engine Cooling System

[bchristie]

On my 2014 C-28 I have two shutoff valves to isolate the hot water heater from the engine cooling system. My question: Can I safely run the engine with these valves closed? Does the engine have a bypass to allow coolant circulation within the engine when the isolation valves for the water heater/cabin heater are closed?

 

[BB marine]

You can safely run the engine with the valves closed. That is what the valves are for. The valves isolate the engine cooling system from the optional heat exchangers of the hot water tank and the Bus heater. The valves are isolation ball valves. In a twin engine inboard application usually only one engine has optional exchangers and the other engine has no connections. Think of the option as an addition to the cooling system that does nothing for the engine. If you are troubleshooting a cooling system leak the first step would be to isolate the optional exchangers from the engine cooling system. Close the valves. If you develop a leak in the optional exchangers the protocol is to close the valves to get you back to safe harbor.

There is no by pass. Valves closed no hot water from the engine coolant and no heat from the bus heater.

 

[Martin610]

I have a 2013 C-28. I think you can wit h those valves closed. One mechanic I have always shuts them off when he works on the boat. I have no idea why. It sometimes takes me a couple of trips in the boat to realize I have to turn them back on. This engine seems to get air pockets in the cooling system. I always keep coolant on the boat so I can top off.

-martin610

 

[bchristie]

Great information and confirming what I thought to be the case. Thank you for your input!