coolant drain plugs; where?

[195752]

Anybody know all the drain plugs to drain coolant for 6pla Yanmar engine and how successful were you in removing all the old fluid? What coolant do they recommend for the 6pla engine?
Thank you much and have a great summer on the water.
Roy

[Norseman]

There is 2 drain cocks that I know of, one on each side of the engine.
I was never able to access the Starboard one, too hidden or too something.
Instead I use just the Port one.
It won’t completely drain the coolant so to clean the system I keep filling up with reverse osmosis filtered water, or distilled water, until the fluid comes out clear.
Very slow draining, it takes hours and hours, but my labor is free.
Also changing zincs at the same time, have to pull hoses and end caps to do a full service and better to drain the coolant first.

As far as the recommended coolant: I forgot the name, but Trex, or Drex something: It is bright orange and these Yanmar engines are very picky on the correct coolant to prevent corrosion. Use the wrong coolant and you are sitting on a ticking time bomb.
Do a quick search on this forum for the correct coolant: I probably mentioned it in a sticky thread called “Repairs, improvement and Maintenance Albin 28TE”
Or some such thing.
Lots of good info about stuff I learned and from other owners who have chipped in.

[Norseman]

The coolant I use is Castrol Transmax, Dex/Merc.

Tried to post a picture of the container, but is seems the “Manage Attachment” function is disabled, or there is a new way to post images?