So I'm trying to drain coolant on my Yanmar 4Jh4-hte and the only drain I can find is under the HE. According to what I've read that will supposedly get 80% of it out but I only got about a gallon out.
Just thought about the coolant lines going to the water heater. Does that WH have to be drained as well? Of course I can't get to the stupid thing.
I can't believe I'm having this much trouble trying to change the stupid coolant.
I used my oil change hand pump w/ 2 gallon container. The small tube that is inserted down the dipstick tube fit in the short clear tube attached to the block drain behind the oil filter. Did not spill a drop.
I used my oil changer also.
Took me some time to find the drain plug in the first place as I seemed convinced it was on the port side of the engine. My engine is a Mitsubishi a bit smaller than the Yanmar.
I removed the plug w little coolant loss and inserted a small ball valve w a hose barb end. Used clear plastic hose of appropriate size to attach to the oil extractor hose. With the system vented above and the valve open I sucked out all the coolant in probably less than two minutes.
I didn't but I probably should have found a rubber cap for the hose barb end to keep the ball valve clean.