I did mine once.
I'd say, probably you'd need to do it once every 2 or 5 years. It will not be very often that you would open up the engine and see calcium deposits, so it is guesswork.

Depends on how often you run the engine and how long for. Usually gets done when you notice the engine getting hot. For my raw water cooled Volvo in my last boat that was used on a weekly basis that was about 2 years. The calcium build up will usually be around the thermostat.

$150 for an engine watchdog unit, is money well spent. Temp alarm, easy install, Ozzie made bal bla

I've fitted engine watchdogs to my yachts and 4WD's for the past 10-15 years. They're great early warning systems.

Serb1980 said..


Thanks guys,
I have installed a small sensor which is connected with wire to the lcd display. It shows temperature. It fits well in the small while in the engine block. Excellent to monitor the temp of the engine block.
I thought of a heat exchanger but it looks like it's not necessary on YSE8.

That's the easiest way. I bought 5 of the LCD gauges that I was going to attach to the usual spots but never got around to it. Instead I bought a mechanical temperature gauge and mounted it on the main bulkhead. These cheap gauges are ideal. Blu-tack one probe to the face of the saltwater intake pump, one to the rubber hose next to the exhaust and anywhere else you like. The batteries last about 5 years. Taped to the bronze skin fitting of the saltwater intake you will be able to monitor the seawater temperature. I used them for years on my fishing vessel to monitor seawater temperature which was vital for tuna fishing.
Water telltale in the cockpit floor is still the best way. When the flow stops and you have steam you have a problem.

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garymalmgren said..
Was not aware of Watchdog, Woko.
It looks like a solution to Serbs question and more.
Serb.
Fit a watchdog
enginewatchdog.com/
Then you will know when to descale and have an alarm in case a hose splits, a hose clamp gives way. the water filter gets blocked (plastic bags), the impeller disintegrates, the belt breaks or slips.

Good one.
gary

Not only temp Gary, even the base model can be used as low oil pressure alarm as well, just hook it up to the warning light sender.