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Tractor Talk Discussion Forum

Re: International Cub - Radiator Overheating and Overflowing

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mkirsch

08-15-2013 11:59:45
64.80.110.74



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You can't fill a Cub radiator right to the top.

The water expands and pushes out as the tractor warms up. It takes approximately 10-15 minutes before this happens.

If you keep filling it right to the top, it will keep pushing water out in a never-ending cycle. It is NOT overheating!

The proper fill level for a Cub radiator is just enough to cover the fins. You will have to shine a light into the radiator neck and look in at an angle to see the proper coolant level.

Cubs do not have a water pump or thermostat. They use a "thermosiphon" system where the water circulates by convection; hot water rises, cold water sinks.

Your power issue may just be a bad memory. The engine is probably down on compression, though, due to sitting so long, and running it will get it loosened up again. Ignition probably needs refreshing too. Valves might stand an adjustment.

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Tractor Novice

08-15-2013 13:36:26
12.170.78.42



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 Re: International Cub - Radiator Overheating and Overflowing in reply to mkirsch, 08-15-2013 11:59:45  
Thanks for the information on how much to fill up the radiator. Again, I admit that I am a novice and may just be overreacting because of just how much water/fluid gets flushed out (at least half of what should be in the radiator). I worry that it is getting too hot.

The power issue though is real. We use to use the tractor for everything! It was the family workhorse. Now there is no way to even plow the garden. As soon, as the blades get into the ground it stalls out and dies. Using the mower bed underneath was great because you just increased the fuel and you could cut just about any heighth grass with ease. Now it bogs down and can barely make it through what it use to cut with ease.

How do I test/fix the compression?

I've had the had redone with new gaskets all around.

I agree that it sets for a long time between uses.

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Chuck (CA)

08-15-2013 16:44:27
70.211.69.178



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 Re: International Cub - Radiator Overheating and Overflowing in reply to Tractor Novice, 08-15-2013 13:36:26  
"How do I test/fix the compression?"

Remove all plugs and coil wire. Open throttle all the way.
Screw in the compression tester in first cylinder. Crank over engine 3 to 4 times and write down results.
Proceed to next cylinder and repeat.
There should be no more than 10% variance between each cylinder.

Now, squirt approx. 1 tablespoon of oil in each cylinder and repeat test.
If compression increases, it indicates a problem with rings; if no difference, it's a problem with valves.

I would think it would have to be a lot of variance in order to have a big power loss, though.

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Chuck (CA)

08-15-2013 16:47:46
70.211.69.178



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 Re: International Cub - Radiator Overheating and Overflowing in reply to Chuck (CA), 08-15-2013 16:44:27  
I would also check the timing and firing order of plug wiring.



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