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  #1  
Old 06-24-2019
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chokmah chokmah is offline
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Default Kubota blew its top

Could I get some advice about the best way to repair this? This is the coolant cap for the Kubota engine for a Powertech generator. It looks like it was welded or brazed.
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Old 06-24-2019
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Looks more like you need a threaded coolant cap like the ones in the attached wed site:


https://www.fillernecksupply.com/thr...eads-hz-40038/


Measure the threaded opening after cleaning and order the correct size in Male pipe thread.
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Old 06-24-2019
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Quote:
Originally Posted by chokmah View Post
Could I get some advice about the best way to repair this? This is the coolant cap for the Kubota engine for a Powertech generator. It looks like it was welded or brazed.
Barry took care of you, but you also look like you have some additional issues. That sound deadening foam needs to be cleaned up and taken off and replaced. That can shorten the life of your generator if it gets into it. It would be time and money well spent to get rid of all that old stuff and replace it. Many of us have used foil sided duct board as a replacement. I have done my engine bay but need to do my generator also, but it isn't as bad as yours looks.
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  #4  
Old 06-24-2019
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Might be beyond help on a quick glance.
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  #5  
Old 06-25-2019
Captain Fred Captain Fred is offline
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Does look like it was soldered onto the top of the tank. Perhaps the threads in the tank are toast and that was a repair ? I would take the tank to a local radiator shop. They may be able to resolder or perhaps silver solder.
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Old 06-25-2019
dthollis dthollis is online now
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A different camera angle shows that it's a filler neck attached to a threaded elbow. I'd remove what you've got and take it to a radiator shop. You could also get a coolant expansion tank from a junk car and make that work if you're on the road and need a quicker fix.
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Old 06-25-2019
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That old worn out foam insulation will send you in for a rebuild pretty quick. I know. So get rid of it.
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Old 06-25-2019
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Thanks everyone for your help.

The insulation you see in my pictures was knocked down when the cap blew off. It has not been falling down on its own. I do have that on my list since it is pretty fragile.

I don't think I can clean up those threads enough, so I may just replace the pipe and elbow and buy a new threaded cap like Barry suggested.

I am barely getting by with a small backup generator in the meantime.
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  #9  
Old 06-25-2019
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Siphon some coolant out with a rag and clean the area being careful not to allow junk from falling into the opening.
Stuff a rag into the opening so you can clean the threads with a Dremel wire wheel and if they are OK, remove the rag and debrie and pipe dope up another screw in cap.


If you cannot find a screw in cap, get a brass cap and have it silver soldered to a copper of brass threaded insert and screw it into place.


Good luck.
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  #10  
Old 10-25-2019
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Default Kubota/Powertech generator is happy again

Thanks for everyone's input on this.



I finally got around to finishing up on this project. I found a local welding shop/auto repair shop to weld/braze this back together. It cost $25, so if it holds another 25 years, that just one dollar per year. Sounds like a bargain to me!



I washed out the engine with water and then distilled water and then filled it with 50/50 coolant/distilled water. I ran it under a load for about 30 minutes and later checked to coolant to be sure it looked clean.
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