Apologies in advance for long post...
The end of the story is that when turned off by BMC 1.5 is making a ticking noise that I'm thinking to be contraction sounds of cooling.
I have had some cooling problems recently that if hoped I'd fixed. A friend used my boat and reported that it had developed a lot of smoke and they had to pull in.
I looked at it and the heat exchanger rubber cap had developed a crack and most coolant/water had escaped. I also saw that the spring in the pressure cap (7psi) looked to have gone, so I've replaced both of these.
Today I refilled coolant/water and tentatively ran the engine. It took a little while to start with some white smoke that went pretty quickly (clean filters?).
It sounded a little faster than usual and I am nervous to run it for too long in case of overheating.
Now the engine has been making some slight ticking noises once turned off, with the ticking noise being more and more spaced out with time. Is this a lag effect of the cooling system being pushing too hard previously?
I appreciate there will be more info needed perhaps. and yes, don't lend your boat to friends
Is this normal?
Thanks