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Old 22-11-2020, 00:04   #1
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Coolant drain plug(s) on yanmar 4JH4AE

Hi
Wanted to drain anti-freeze from this engine in Beneteau 40. There is a plug on port side but only got out about 3.5 litres. The user manual says there are 7 litres in engine but shows only this one drain plug. Is there another drain plug .... seems a somewhat silly question but I can't find it.
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JohnB40
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Old 22-11-2020, 00:10   #2
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Re: Coolant drain plug(s) on yanmar 4JH4AE

My 4JH4E has a few ..... silly question but you do have the cap open to let air in? What engine is it?

Greg
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Old 22-11-2020, 13:32   #3
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Re: Coolant drain plug(s) on yanmar 4JH4AE

Yes, thanks ..... the cap is off and the 4 litres flowed out very steadily. However I think another 3 litres are still in there.
The yanmar engine is a 4JH4AE .... NOT the turbo.
Thanks
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Old 22-11-2020, 14:20   #4
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Re: Coolant drain plug(s) on yanmar 4JH4AE

On my 3JH4E I have 3 of those drain plugs on the engine block.
You also have coolant in the hot water tank heating spirals.
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Old 22-11-2020, 14:38   #5
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Re: Coolant drain plug(s) on yanmar 4JH4AE

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Originally Posted by JohnB40 View Post
Yes, thanks ..... the cap is off and the 4 litres flowed out very steadily. However I think another 3 litres are still in there.
The yanmar engine is a 4JH4AE .... NOT the turbo.
Thanks
JohnB40
So basically same engine as mine. Keep looking they are there. Do you have a manual..... next time at boat Iíll send you a photo.

Greg
4JH4E
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Old 22-11-2020, 18:13   #6
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Re: Coolant drain plug(s) on yanmar 4JH4AE

Yes, I do have a "small" users manual but under the section for draining the coolant it just shows the engine diagram with the one drain plug. It also has other Yanmar engine diagrams, for example, the turbo version, and for that it shows a drain on the other side of the engine, just behind the oil filter. Again just one.
I guess, they showed one, and I've just not looked for another. The one shown has a nice polythene tube attached so you can't miss it. I hope to get back to boat in couple of days and sounds like if I look, I should find at least one more.
Thanks
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Old 23-11-2020, 04:26   #7
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Re: Coolant drain plug(s) on yanmar 4JH4AE

Yes, some of drain valves have a hose. Only one of mine did, the others I assumed fell off, but I bought new hose and attached.The new manuals leave a lot to be desired.... nothing like the books they had for earlier models that showed everything. I bought 3 different manuals for my 4jh4e (2005) as well as a parts manual.

I would be shocked if there were not more than 1. Happy Hunting.......

Greg
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Old 23-11-2020, 11:02   #8
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Re: Coolant drain plug(s) on yanmar 4JH4AE

I also have a 4JH4E and the 3 coolant drains are located:
1. Below the coolant pump on the front of the engine
2. On the side of the engine aft of the fuel pump
3. At the back of the engine below the heat exchanger
If you are going to flush the system with some kind of chemical descaling solution there may be a warning on the domestic water heater that descalers may damage the heat exchanger (probably aluminium).
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Old 23-11-2020, 12:08   #9
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Re: Coolant drain plug(s) on yanmar 4JH4AE

My 3JH5E coolant loop includes the water heater and also a Red Dot heater...a little daunting and probably messy trying to drain it all. My very knowledgeable Yanmar man here says to drain all I can from the engine...but ok to let the rest remain in the lines. Over time and over repeated coolant refills, it remains clean and effective.
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Old 23-11-2020, 12:52   #10
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Re: Coolant drain plug(s) on yanmar 4JH4AE

Quote:
Originally Posted by Cabo Jim View Post
I also have a 4JH4E and the 3 coolant drains are located:
1. Below the coolant pump on the front of the engine
2. On the side of the engine aft of the fuel pump
3. At the back of the engine below the heat exchanger
If you are going to flush the system with some kind of chemical descaling solution there may be a warning on the domestic water heater that descalers may damage the heat exchanger (probably aluminium).

Hi Cabo Jim,

What a good post, Iíve been hunting for my drains for almost a year but never thought of one near the water pump (which makes sense). The book and manual just doesnít show enough. Very helpful thanks.

Cheers Woody
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Old 23-11-2020, 22:36   #11
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Re: Coolant drain plug(s) on yanmar 4JH4AE

Thank you all
I went back to boat and found a second drain on the other side of the engine just behind the oil filter ... hard to see amongst other "stuff" in that area. I think that's now removed enough coolant to keep boat and me happy.
Yes, there are a couple of hoses going to another exchanger that heats fluid in the "hydronic" heating circuit but not going to bother with that bit.
Again thanks
JohnB40
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Old 23-11-2020, 23:29   #12
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Re: Coolant drain plug(s) on yanmar 4JH4AE

Just make sure if you are switching coolant types (green to orange) you must flush out entire system as the two are not comparable and could cause jelling. When I bought my boat I switched (shell rotella ec) and did a complete flush. I removed thermostat so system did not need to heat up completely to open...... then just emptied, filled with water ran engine a few minutes then emptied. Did that about 3 times until water was coming out pretty clean..... then filled system up, put new thermostat in and happy ever after! I was amazed how dirty mine was.......

Good luck
Greg
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Old 24-11-2020, 08:39   #13
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Re: Coolant drain plug(s) on yanmar 4JH4AE

Quote:
Originally Posted by Cabo Jim View Post
I also have a 4JH4E and the 3 coolant drains are located:
1. Below the coolant pump on the front of the engine
2. On the side of the engine aft of the fuel pump
3. At the back of the engine below the heat exchanger
If you are going to flush the system with some kind of chemical descaling solution there may be a warning on the domestic water heater that descalers may damage the heat exchanger (probably aluminium).
Thanks, great information. We've same engine.
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