Originally Posted by sunchaser
Why not pull the HXer off, replace those aged hoses, rod out and reinstall. Did it on my Westerbeke this summer. Replace coolant too while you're at it. Not a big deal.
It is a big deal if you live on the hook and your nearest source of parts at the moment is 3 hours steaming plus a dinghy and then a car ride away.
I had the acid, hose and adapters onboard to do a flush so that was the route I took.
Ended up with a fair bit of grunge in the bottom of the bucket after I drained the acid so clearly flow should be better, but still not as healthy a spurt out the exhaust as I'd expect when running and laser thermometer shows heat exchanger end at around 95 degree.C so I suspect the pump needs a new impellor, it'll get one, not this week.
Genset is not high on the priority list with so much solar on board.