Coolant puzzle - Page 2 - SailNet Community
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post #11 of 28 Old 06-11-2015
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Re: Coolant puzzle

I have the same engine on a Catalina 36. It does not use a header tank. There is an overflow hose from the radiator cap that just goes to the bilge. Your system may be designed such that you do not need the header tank. If you open the cap like the one you have shown when the engine is still hot, you will get bubbles. When the engine is cold you should see coolant level at about and inch or more below the hole opening for the cap. Do you have a temperature gauge? If your engine is running at about 180 degrees or lower, you should be OK.

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post #12 of 28 Old 06-11-2015
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Re: Coolant puzzle

Is there a water heater connected to the system? If the heater is higher than the engine, and in most boats it would have to be, that would cause coolant to flow out the cap as well. I still agree with the header tank idea though. Follow the hoses down and you should find it.
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post #13 of 28 Old 06-15-2015 Thread Starter
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Re: Coolant puzzle

You all were exactly right. I found another tank right next to the hot water heater with a pressure cap and an overflow hose.

It makes a lot more sense now.

Last question, well maybe not.

Is that header tank supposed to be full of coolant. It was about 4 inches deep and only had a inch or two in the bottom. I added another inch but didn't fill it.
Should I?

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post #14 of 28 Old 06-15-2015
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Re: Coolant puzzle

If there isn't an atmospheric catch tank, the header tank is allowing for the expansion of the coolant, so it needs an air space at the top. I'd say about half way up is about right, when the engine is cold.

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Re: Coolant puzzle

The level in this expansion tank tells you much about slow leaks and blown head gaskets.To be looked at occasionally.
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Re: Coolant puzzle

Thanks you all. Makes sense.

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Re: Coolant puzzle

Quote:
Originally Posted by Capt Len View Post
The level in this expansion tank tells you much about slow leaks and blown head gaskets.To be looked at occasionally.
And people opening the other cap!

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Re: Coolant puzzle

Quote:
Originally Posted by miatapaul View Post
And people opening the other cap!
I resemble that comment.

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post #19 of 28 Old 06-17-2015
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Re: Coolant puzzle

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Originally Posted by davidpm View Post
I found another tank right next to the hot water heater with a pressure cap and an overflow hose.
I may be reading that wrong, but normally the pressure cap would NOT be on the expansion tank, but on the engine or water heater tank. The higher one I would think. Expansion tanks usually have just a silly splash prevention cap.

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Re: Coolant puzzle

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Originally Posted by aloof View Post
I may be reading that wrong, but normally the pressure cap would NOT be on the expansion tank, but on the engine or water heater tank. The higher one I would think. Expansion tanks usually have just a silly splash prevention cap.
Try to pay attention. Read post 8. You are referring to an atmospheric catch tank, not an expansion tank.
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