Raw water draining out

[Kevinstone]

Grayco is still the hardware store here yes. I use regular rubber heater hose and I change zinc’s regularly. One repair shop I spoke to said the life of a copper heat exchanger is about 5 years. My question on this post was answered right away about the water draining out that is. Thank you guys...

[Kevinstone]

Our heat exchanger died in Florida. So I’ve only been running raw water cooling for about a month. I do plan to replace the heat exchanger when we get back to Vermont in about another month. I will acid flush the engine before I switch back to freshwater

[Kevinstone]

Thanks Dave, I did do the impeller already the other day as a beginning of my tests. I did find today some scale in the cooling hoses before the thermostat housing. I got that all cleaned up. I think the biggest issue was I was not closing the through hull and I was getting air pockets. I’ve just...

[Kevinstone]

Hello Everyone,Is it normal for a raw water cooled engine to drain down after shutdown? I have been having erratic temperature readings and started pulling hoses to check for blockage. I was surprised that the head and manifold were dry at the upper ends. I did not explore how far down it had drained....