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Tractor Talk Discussion Forum

Cub Tractor - Cracked head

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Dick W.

11-30-2003 10:44:01




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I am trying to help a friend get an old (1949) Cub up and running....it had been sitting for 5-6 years with no coolant or gas. After going through carb, wiring, plugs, etc. I finally got it running last night. Runs smooth, hydraulics work.....I'm feeling real good! Then all of a sudden I start to see a tell tale puddle of coolant on the garage floor. Further inspection shows a hairline crack on the top of the head were is is leaking..... very small amount, but still leaking. I am not a mechanic but have fair mechanical skills. Can the head be fixed? What should I do? Cost? Do I need to worry about the possibility of a cracked block too?...and how would I check for that?

Thanks in advance for any help.

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Scott TN

12-02-2003 13:22:41




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 Re: Cub Tractor - Cracked head in reply to Dick W., 11-30-2003 10:44:01  
New equipment manufacturers are using ginger root to seal small leaks caused by porosity. I have used ginger root in one of my tractors that had a slight head leak. You can purchase at any General Motors Dealership, ask for cooling system sealing tabs. Use more than one package (5 tabs in pack)based on the cooling system size compared to a car. I crush the tabs and add to the radiator, run the tractor for about 1 - 1.5 hrs and the leak will seal up.

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Bus Driver

11-30-2003 15:09:49




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 Re: Cub Tractor - Cracked head in reply to Dick W., 11-30-2003 10:44:01  
The cracked head is not unusual. I suspect that one cause is running with coolant low, overheating, then adding coolant while really hot. The new coolant would "shock" the cast iron and cause crack. Chances are the crack is just limited to what you see. Drain the system, lightly grind a groove with a Dremel tool, clean thoroughly with lacquer thinner, and patch with JB Weld. Cure at least 24 hours. If it works, this is the lowest cost repair. If not, then replace the head. As you fear, there might be much bigger problems- but chances are that the head crack is the only problem. Keep thermo-siphon cooling systems full!

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