Hello All-
I have a Yanmar 3HM35F and today I planned to change the fresh water. I pulled out about 3/4 of a gallon of the orange coolant. As this was my first time changing the coolant I spent some time looking around and noticed that I had some rust forming on a particular spot on the engine. I had seen this before and planned to address it, but as I was looking at how to get access to refill the coolant I looked closer and it appears that the heat exachanger might be leaking raw water from the forward part of the exchanger. So like all boat projects my 2 hour fresh water change has turned into a larger project.
At this point I believe I will need to take off all hoses(raw and fresh) and then remove the heat exchanger. Once I get it home I should be able to get the cap off and replace the gasket.
Before I dive to far into this and assume I am fixing the problem, does what I am seeing and my remedy seem like the most likely culprit? Do heat exchanger gaskets leak? Or is this going to be an even larger issue? It is hard to get images, but I have attached a couple
I have a Yanmar 3HM35F and today I planned to change the fresh water. I pulled out about 3/4 of a gallon of the orange coolant. As this was my first time changing the coolant I spent some time looking around and noticed that I had some rust forming on a particular spot on the engine. I had seen this before and planned to address it, but as I was looking at how to get access to refill the coolant I looked closer and it appears that the heat exachanger might be leaking raw water from the forward part of the exchanger. So like all boat projects my 2 hour fresh water change has turned into a larger project.
At this point I believe I will need to take off all hoses(raw and fresh) and then remove the heat exchanger. Once I get it home I should be able to get the cap off and replace the gasket.
Before I dive to far into this and assume I am fixing the problem, does what I am seeing and my remedy seem like the most likely culprit? Do heat exchanger gaskets leak? Or is this going to be an even larger issue? It is hard to get images, but I have attached a couple