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Thermoil Head and Cylinder Cleaning


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  #1  
Old 08-01-2005, 09:49:56 AM
midpw midpw is offline
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Question Thermoil Head and Cylinder Cleaning

Hi Guys,

I have a 7 HP UA Thermoil and I have finally dragged out of storage to begin work. It was stuck with the piston about 3/4 in toward the head and I backed the piston with some soaking and persuasion on the crank shaft. I cannot get the piston and crank "through" TDC, It hangs up and I have to back off. The motion is smooth throughout the rest of it's travel.

I assume that the cylinder and piston and head are pretty well carboned up. And now for my question.............

Are you aware of a method or material that will "soak" this carbon buildup away? I don't want to remove the head if I don't have too. I know that this style of diesel probably failed for just this reason..........

But I also know that there some Thermoil guys out there with a whole lot more experience than me so.......................whatcha' think....????????
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Old 08-01-2005, 10:06:28 AM
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KeithW KeithW is offline
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Default Re: Thermoil Head and Cylinder Cleaning

The Auto Zone house brand carb cleaner in the yellow can seems pretty good at loosening up carbon. Are you sure it's carbon and not something else like a stuck valve or mouse nest? Not kidding about the mouse nest thing. Car collectors have had mice go through the entire exhaust system, past the open exhaust valve and build a nest in a cylinder.
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Old 08-02-2005, 08:18:51 PM
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Kenny Towne Kenny Towne is offline
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Default Re: Thermoil Head and Cylinder Cleaning

Keith has a point there.....you never know what might be on there. Does it feel like a "hard" stop or something with a little give (like a mouse nest). You might be able to remove the injector and cup and peek through the small opening into the cylinder with a mirror. IF you can get the cup out! Otherwise, the only ways to look in would be to remove the head or pull the piston. I'm not fond of pulling pistons out as it seems everytime I do, I make matters worse. Another couple things about squirting things like Gumout into a Thermoil.....firstly that liquid and dissolved stuff has to go somewhere. the valves are not on the bottom of the cylinder and as such not suitable for draining such goodies out. The other might be scary....Thermoils love aromatics like Gumout and WD40 and gasoline fumes and the like. If you get a load of that in there and crank it over with any intent....it just might light off when you least expect it. I believe there is a certain gentleman at Rough & Tumble who unintentionally launched the cup out of the injector with a little velocity in this manner. I know he frequents this page and he might be able to add some thoughts as well. He resurrected a Brantford recently and did an armload of work to get it in shape.
If you need a manual to take a peek at the following address, I have a Model "U" manual posted on my website, maybe it'll help a little. http://www.arcticrail.com/engines/en...ermoilU01.html

Send me a picture or two of your beast, I'd like to add it to the web pages to build up the Thermoil library some more!


Hvids Reign Supreme!
Kenny
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Old 08-13-2005, 06:57:45 PM
MikeF MikeF is offline
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Default Re: Thermoil Head and Cylinder Cleaning

I agree with the other guys. I would remove the head.
This will allow you to do a complete inspection of valves,
seats, and the injector. I have a 3HP and all of the above
needed a good cleaning, they were carboned pretty bad.
As they mentioned, be careful with the wd40, ect. it will
definitly fire on fumes from such stuff. Hope this helps.
MikeF
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