Have been experiencing increasing fuminess inside the boat and had been unable to find a cause.
In desperation I removed the heat exchanger
and found no gasket
between the exchanger and the block.
We have had the engine
since brand new and this is the first time the exchanger has been removed so it must have been missed out during assembly ( the manual shows one in the exploded view)
So, if you are experiencing excessive exhaust
smells from a Yanmar
3JH2 this may be a place to look.
It has been like that for over 1000 hours, so I guess we are lucky not to have died from the exhaust