Looks great Shaggy
Are you soaking the dv 24 HG?
Last Thursday had a bit of a fright when black gunk spat out of my exhaust
No water in the oil so that was good
I don't have a temp gauge but the engine didn't feel too hot but water flow was down
Pulled the raw water line off this morning to be met with the overwhelming smell of stale fish
Removed the fish bits
Flushed with vinegar solution
Everything seems ok.

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That's a piece of fish in the pic
Now the water out of the exhaust is clean so I can only imagine the black gunk was fish related???
Of course nothing ever goes to plan as I tried to replace the pencil anode and must have over tightened the retaining bolt because now the thread seems flattened
And finally I know this green blue powder means that something is not right but not sure what the problem is any ideas??