Cubradiator overflow tube

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Cubradiator overflow tube

Postby glinka » Thu Jul 25, 2013 6:42 pm

Does the whole hood have to come off, fuel tank and all, to get to radiator overflow tube? There is a hole in it spewing coolant all over. Is there an easy way to get it off?
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Re: Cubradiator overflow tube

Postby Bob McCarty » Thu Jul 25, 2013 6:51 pm

The top of the overflow tube is soldered into the back of the radiator neck. The bottom goes through a hole in a clip that is fastened to one of the rear radiator bolts. You will need to remove the hood and gas tank. However, if you have recently added coolant, you may just have excess draining out. I have several Cubs without the tubes, and any excess coolant is dispersed by the fan instead of dripping out the bottom of the tube. These Cubs are not trailer queens so I am not concerned about a little antifreeze on the hood or elsewhere.

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Re: Cubradiator overflow tube

Postby Bus Driver » Thu Jul 25, 2013 6:59 pm

The experience of others may vary, but the only repair that has worked for me is to remove the radiator and take it to a radiator repair shop. Lots of stuff to remove. Be advised that the coolant level for a cub is proper only within a narrow range. Too much and it will overflow as the coolant warms and expands, too little and the coolant will not circulate at all. No circulation and the cub will overheat to the point of engine damage.
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Re: Cubradiator overflow tube

Postby glinka » Thu Jul 25, 2013 7:11 pm

I can see the tube near the radiator cap. Right at the bend it has a hole. That's where the coolant is coming out. Is that a problem, or just a nuisance?
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Re: Cubradiator overflow tube

Postby Denny Clayton » Thu Jul 25, 2013 7:37 pm

glinka wrote:I can see the tube near the radiator cap. Right at the bend it has a hole. That's where the coolant is coming out. Is that a problem, or just a nuisance?

Let it spew for a while. Once it reaches the proper level it should quit.
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Re: Cubradiator overflow tube

Postby Bob McCarty » Thu Jul 25, 2013 8:02 pm

If you have enough access to the hole, you could put a dab of solder on it or even JB Weld.

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