This is interesting. I have a Westerbeke with a remote coolant pressure tank because the water heater is higher-up than the engine. The Westerbeke part naming and explanations are a bit misleading, and not entirely correct, in my opinion; but I'm open to learning. They call it an expansion tank. I always thought "expansion tank" was synonymous with "coolant recovery tank." Maybe I'm wrong about that. But anyway, I have one, part number 24177, "Metal tank used when the hot water tank (heated by coolant water) is located at or above the top of the engine. **When adding a tank to the cooling system change out the cap with that on the manifold."
I have coolant recovery tanks at both locations, at the exhaust manifold tank near the engine, and also at the remote tank. I found this in the engine manual:
"NOTE: When the remote expansion tank #24177 is used, the plastic coolant recovery tank
should be removed and discarded and its connection point on the exhaust manifold plugged
with a 1/8 NPT fitting."
So, should I do that, eliminate the coolant recovery tank near the engine?
Note that the pressure cap on the remote tank is rated at a lower pressure than that on the exhaust manifold, per Hansen Marine Engineering, and the manual, which has the note by the remote expansion tank "Pressure cap is rated lower than manifold cap."
I have coolant recovery tanks at both locations, at the exhaust manifold tank near the engine, and also at the remote tank. I found this in the engine manual:
"NOTE: When the remote expansion tank #24177 is used, the plastic coolant recovery tank
should be removed and discarded and its connection point on the exhaust manifold plugged
with a 1/8 NPT fitting."
So, should I do that, eliminate the coolant recovery tank near the engine?
Note that the pressure cap on the remote tank is rated at a lower pressure than that on the exhaust manifold, per Hansen Marine Engineering, and the manual, which has the note by the remote expansion tank "Pressure cap is rated lower than manifold cap."