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Sticking cap

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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Sticking cap

Unread postAuthor: Potato Head » Mon Oct 01, 2007 12:08 am

Hey spud gunners

I got an issue. My top keeps getting stuck. I tried a few different greases but none seem to help. I have tried cutting down the threads on the cap but that didn't help, actually made it worse and unsafe. Got any ideas or lubes that do work? Any help would be great. Thanks and keep up the good work
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Unread postAuthor: MikeNice » Mon Oct 01, 2007 12:26 am

You may want to try some graphite in the threads . . . I've never tried it but, why not? Any of the lubes I've ever tried have eventually made for a sticky cap. I always keep a strap wrench or two handy when I go spudding just in case it sticks. Also, what are you using for fuel? If you are using a fuel that doesn't burn well it could be a residue issue. In that case clean your chamber and cap and use a cleaner burning fuel. No hairspray, no bug spray. I like Static Guard or butane for clean fuels. Hope this helps.
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Unread postAuthor: Pilgrimman » Mon Oct 01, 2007 12:54 am

Assuming I understood your post, you are having trouble putting the plug on a combustion. I'd recommend adding fittings to it like this: from the existing female threads, some kind of male threaded fitting that has male threads on both ends, and a threaded endcap. The benefits are twofold: One, you don't have to lube anything, just get the male threaded fitting into the existing female threads once, and you're ready to go. Two, the threaded endcap will allow you to apply more torque on it if for some reason it starts to thread badly too. However, you can avoid this by using clean burning fuels, as MikeNice suggested. Propane is ideal, but anything that doesn't have superfluous ingredients should burn well.

I hope I helped! 8)

@MikeNice: Freaking nice avatar!!!!!!
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Unread postAuthor: silverdooty » Mon Oct 01, 2007 9:20 am

clean it up. not just the lubricant, but the threads.

Click Here For extremely easy clean up
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Unread postAuthor: ShowNoMercy » Mon Oct 01, 2007 9:28 am

Take some cleaner/degrease r and spray it down and then use some grease and put it back together.
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Unread postAuthor: MikeNice » Mon Oct 01, 2007 12:28 pm

@ Pilgrimman: Thanks . . . that logo took a bit of work and many many versions. my ipla az site will be up soon.
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Unread postAuthor: jimmy101 » Mon Oct 01, 2007 3:58 pm

Like silverdooty said, read the Latke page.

Lubricants don't really work very well on the cleanout plugs, at least in my experience.

Teflon tape helps a lot (and the plug will seal much better) but it won't last very long.

A homemade wrench for the cleanout plug will help alot. Just cut a suitably sized square hole in a piece of 1x4 or 1x6.
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