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Cleaning Gummed Cox Engines

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Cleaning Gummed Cox Engines

Post  Darren19 on Sat Apr 20, 2013 9:24 am

I have heard of many ways to degum and clean seized cox engines after storage. Alcohol, denatur alcohol, boiling, anti freeze etc. what is the best and most effective way to degum and clean a cox engine?

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Re: Cleaning Gummed Cox Engines

Post  Mark Boesen on Sat Apr 20, 2013 9:53 am

There are many ways to clean engines and most work great, its a matter of personal preference and whats on hand. I'd suggest not soaking engines for extended lengths in brake fluid or alcohol as those absorb moisture and may cause corrosion.
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Re: Cleaning Gummed Cox Engines

Post  SuperDave on Sat Apr 20, 2013 10:03 am

A through soaking in Hoppe's #9 Gun Cleaning Solvent and the application of mild heat has worked well for me.

Essential is allowing time for the solvent to work rather than rush the operation.

Also using the appropriate Cox wrench and properly fitting screwdrivers is recommended. (See the "search" function because this has been discussed here many times.) Go to: Cleaning)


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Re: Cleaning Gummed Cox Engines

Post  jsesere on Sat Apr 20, 2013 9:31 pm

Here are some tips for cleaning.
For removing dried up Castro oil and fuel and cleaning the inside of the cylinder and other internal parts any 15% nitro fuel or better and a good stiff toothbrush or a Q-Tip works. I buy medical or dental grade because they are stiffer and don't fall apart that easily.
If you take a bright flashlight you can shine it down the needle valve opening on a radial back plate and look through the venturi to check for clogging. A sewing needle works great for clearing it. Glow heads tops can be cleaned by chucking one up in a Dremel and using 320B waterproof sandpaper or something similar.
For polishing the silver colored parts Mother's Mag and Aluminum Cleaner is the hot ticket. For back plates I use Wight's Copper Cream and a Q-Tip.

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