[C320-list] Yanmar Heat Exchanger

[Dave Anderer]

I've noticed a slight uptick this season in the temp gauge on my 3GM30F.
Nothing major, but it seems to run a little hotter than I recall at my
normal cruise speed of 2800 RPM.

I'm checking the usual suspects, but it also occurs to me that I've never
pulled the heat exchanger and had it cleaned.  Looking at the manual,
pulling it seems to be a trivial task.

Anyone done this and have any insights/suggestions?

Thanks.