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Old 14-05-2015, 22:04   #1
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Cooling System Issue

Although my 30 year old yanmar 2gm20F runs well, the cooling system reservoir always appears to be empty. I don't have an overflow tank, so when I add antifreeze, and run the engine, the fluid is spit out of the tube that runs into the bilge. Seems like whatever I pour in all comes out. But the engine does not seem to be running hot - around 160 after the thermostat and about the same at the mixing elbow. The temp. in the exhaust hose after the elbow but before the muffler is around 90 degrees.

What could be causing this?
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Old 15-05-2015, 00:22   #2
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Re: Cooling System Issue

I'd get an overflow tank. It may be when your cooling system heats it expands enough to push out a volume equal to your reservoir. Since there is no expansion tank, when it cools, it sucks in air instead of coolant.
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Old 15-05-2015, 03:27   #3
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Re: Cooling System Issue

replace the pressure cap on the heat exchanger
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Old 15-05-2015, 04:55   #4
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Re: Cooling System Issue

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What could be causing this?
expansion
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Old 15-05-2015, 05:43   #5
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Re: Cooling System Issue

Probably expansion. Back in the day (pre-1970) cars did not have expansion tanks and you learned to leave the af down ~ 1 1/2 inches.

And the reason cars have overflow tanks is NOT to recover the coolants, but to exclude oxygen and reduce corrosion.

On the other hand, frequent af changes on marine engines are not a real bad thing. While long life antifreeze can easily go 5 years, most marine engine manufacturers require more frequent changes because of the risk of seawater contamination... though I would simply test for chloride ion (not chlorine).
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Old 15-05-2015, 09:59   #6
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Re: Cooling System Issue

Thanks for the responses. I suspected expansion might be the problem since I'm not having any overheating problems but couldn't figure out why. I'm going to replace the cap immediately and look into putting in an overflow tank. I suspect it wasn't put in for space reasons, but we'll see.

Thanks so much, a Chesapeake sailor...
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Old 22-08-2015, 21:12   #7
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Re: Cooling System Issue

I have a similar problem, but o do have an expansion tank. It will fill up and overflow, takes about 15 hours from half full to overflow? Thought anyone.




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Old 22-08-2015, 21:39   #8
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Re: Cooling System Issue

Too much water in tank when cold or tank too small if engine is otherwise running normal.
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Old 22-08-2015, 21:55   #9
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Re: Cooling System Issue

No to both suggestions, has run fine for 1600hours.
It does not fill fast and overflow, takes many hours of running.
Any other thoughts?


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Old 22-08-2015, 22:23   #10
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Re: Cooling System Issue

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I have a similar problem, but o do have an expansion tank. It will fill up and overflow, takes about 15 hours from half full to overflow? Thought anyone.




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Small leak in heat exchanger, raw water getting into fresh water....
???
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Old 22-08-2015, 22:30   #11
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Re: Cooling System Issue

Thanks
I expect so.
I guess I am just wondering how long I have to get to somewhere to get it fixed and how big a job it really is.


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Old 23-08-2015, 15:46   #12
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Re: Cooling System Issue

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Thanks
I expect so.
I guess I am just wondering how long I have to get to somewhere to get it fixed and how big a job it really is.


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Not a big job. Don't need a tech for it. Easy DIY job...depending on length and routing complexity of hoses. Typically can be knocked out in a couple of hours or less.
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Old 23-08-2015, 16:15   #13
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Lightbulb Re: Cooling System Issue

I think that stop on cooler is wrong type. Have two type one is for engine with expansion tank and another just stop that keep pressure in system, or you can ad small expansion tank (from car)
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