Coolant Blow Off normal?

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49Cub2017
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Coolant Blow Off normal?

Postby 49Cub2017 » Wed Apr 19, 2017 10:25 am

I fill the radiator coolant level up to the top every time before I start to mow and every time within a few minutes I get coolant blowing out of the overflow hose at the top of the radiator. I measured what I put back in this time and it was close to 17 or 18 ounces. Is this normal? Are Cubs designed to be running 17 or 18 oz below full? Since I try to keep a 50/50 antifreeze mix in there it seems silly to keep replacing it just to have it blow out.

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Re: Coolant Blow Off normal?

Postby Stevetractor » Wed Apr 19, 2017 11:22 am

The coolant expands as it warms up. Since a cub has no overflow tank, there needs to be an expansion allowance at the top of the tank. Next time, once it cools, look inside radiator. Coolant should be just above the top of the tubes. It will blow some out till it finds its level. Under hard use I add some 50/50 mix a couple times a year and then let it blow the excess out. Just a tip, I add a small piece of clear plastic line over the bottom of the overflow pipe to extend it out though bolster so the fan doesn't spray the coolant everywhere. Good luck

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Re: Coolant Blow Off normal?

Postby 49Cub2017 » Wed Apr 19, 2017 5:32 pm

I expect some coolant to blow out, but 17 or 18 oz? Seems like a lot. I guess I'll just keep topping the radiator off since I don't want the tractor to run any hotter than it has to. I do wish there was a recovery bottle, but where would it go? Not much room in there for one!

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Re: Coolant Blow Off normal?

Postby Glen » Wed Apr 19, 2017 5:40 pm

Hi,
Here is a page below from the Cub owner's manual, telling where to fill the radiator to, it is the paragraph at the lower left of the page. :)

http://farmallcub.com/rudi_cub/www.clea ... age-24.jpg
Last edited by Glen on Wed Apr 19, 2017 7:34 pm, edited 2 times in total.

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Re: Coolant Blow Off normal?

Postby ScottyD'sdad » Wed Apr 19, 2017 5:44 pm

Sounds like an excessive amount coming out, to me.
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49Cub2017
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Re: Coolant Blow Off normal?

Postby 49Cub2017 » Wed Apr 19, 2017 6:22 pm

I appreciate the information from the owner's manual. If I fill it to the recommended level, it blows out what it wants and runs at a much lower level...why I don't know!

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Re: Coolant Blow Off normal?

Postby Bill Hudson » Wed Apr 19, 2017 7:01 pm

As long as the tubes are under the coolant level when the engine is cold you have enough to run your Cub. The system is a non-pressurized system, it you have a pressure cap, change to a non pressure cap. Seventeen or 18 oz. is a bit over half a quart, I have three operating Cub and I'm sure I could put a half quart in each one and get it to go out the overflow after working them hard. Bottom line I don't think you have a problem.

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Re: Coolant Blow Off normal?

Postby Crimson Tim » Wed Apr 19, 2017 7:59 pm

About half a quart sounds about right to me.
Here's another question: after you work it and it blows out that much coolant, what happens if you keep working it? I'd bet the overflow tapers off and quits except for the occasional puff of steam from time to time. If so, then you should be good right there. No need to add more.
If it continues to blow off steam without tapering off, then you have a problem. A head gasket, cracked head or head bolt issue would be likely candidates.

Also note that it will have a greater tendency to overflow when you nose down a significant hill.

It's is hard to see past the baffle at the radiator neck. Mine settles into more or less equilibrium where you can just barely see that there's any liquid in there.

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Re: Coolant Blow Off normal?

Postby Matt Kirsch » Thu Apr 20, 2017 9:05 am

That top tank holds a lot of coolant. If you fill it to the top, it will pretty much spit out the entire contents of that top tank when it warms up and the coolant expands.

If you keep filling it up and letting it run out, please use regular water if you or your neighbors have pets that sniff around the yard. They will find the spilled coolant, lap it up because it tastes sweet, and get sick, if it doesn't kill them outright.

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Re: Coolant Blow Off normal?

Postby Urbish » Thu Apr 20, 2017 9:46 am

Matt Kirsch wrote:If you keep filling it up and letting it run out, please use regular water if you or your neighbors have pets that sniff around the yard. They will find the spilled coolant, lap it up because it tastes sweet, and get sick, if it doesn't kill them outright.


Not to mention birds, squirrels, chipmunks, and anything else living near your property.

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Re: Coolant Blow Off normal?

Postby Matt Kirsch » Thu Apr 20, 2017 12:36 pm

The wild fauna seem to be a little bit smarter than the domesticated ones. I know for a fact that woodchucks won't touch the stuff.

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Re: Coolant Blow Off normal?

Postby Clownfish » Thu Apr 20, 2017 12:40 pm

Caterpillar makes a coolant with what they call "Embitterment." It has a very bitter taste that will keep animals from drinking it.

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Re: Coolant Blow Off normal?

Postby Urbish » Thu Apr 20, 2017 1:27 pm

Matt Kirsch wrote:The wild fauna seem to be a little bit smarter than the domesticated ones. I know for a fact that woodchucks won't touch the stuff.


I once forgot a drain pan full of coolant in my old garage that was less than sealed. I discovered the pan a few months later with a bloated, bright green chipmunk floating in it. It looked radioactive.

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Re: Coolant Blow Off normal?

Postby 49Cub2017 » Sat Apr 22, 2017 1:38 pm

To respond to some of the latest postings, yes, it seems to stabilize at that 17 or 18 ounce amount and other than the occasional puff of steam that seems to be it. I think I'll try running next time without adding more, but I'd be surprised if it goes any lower. I don't think it's a pressure cap, but I'll take a look at that. Since it's not a closed system in that there's that overflow up at the top of the radiator, why would the cap make a difference? Good point about losing liquid if pointing downhill. I stopped the tractor the other day in that position and I immediately got coolant overflow...I won't be doing that again. I am careful about exposing animals to antifreeze, but it's good to keep the message out there!

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Re: Coolant Blow Off normal?

Postby Bill Hudson » Sat Apr 22, 2017 3:21 pm

A pressure cap does as intended, raises the internal pressure. For example a 7 pound cap holds the pressure at 7 pounds which increases the potential for leaks, not a good thing.

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