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Cox Engine of The Month
November-2017
MauricioB's

"Cox Tee Dee .010"



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Bee backplate screw-sealing

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Bee backplate screw-sealing

Post  roddie on Wed Aug 02, 2017 3:09 pm

This might help to seal a worn backplate with cracked/broken screw-bosses. I used a common household kitchen glove for the rubber.. and used a paper-punch to make small (1/4" diameter) discs. Thin sheet plastic behind the rubber helps to punch a "clean" disc.. or else it may not cut all the way around. A short piece of 1/4" thin-wall alloy-tube and wood-block could also be used to make them. The rubber in these particular gloves I believe is "Latex".. and approx. .015" thick.

Once made, I pierced the center of the disc using an awl, by sticking it into a pine wood-block.



The disc will "cling" to the awl-shaft after being pierced. Leave it on there and get one of your backplate screws. Using tweezers (or your fingers).. tug one side of the disc to stretch-open the hole and insert the screw up to its head, then remove the awl.



Insert the screw with disc installed, into the backplate. It will look like this..



When the screw is tightened.. it will suck the disc down into the seat in the backplate.



The disc will "distort".. but having been "pierced" with the awl; it should adequately seal underneath the area around the screw.. as well as under its head. Unlike liquid-sealants; it's not messy/smelly.. and "may" even prove to be re-usable when and if disassembly is required.

In extreme cases where the screw-seat in the backplate has broken-through.. you could additionally try punching-out 1/4" diameter discs made from thin plastic-sheet.. and drill the center with a 1/16" drill-bit.. (drill first.. punch second) This will require opening-up the 1/16" hole using an awl.. just enough to install the 2-56 screw. Install the plastic disc/washer onto the screw "first" followed by one of the aforementioned rubber-disc below it. Tighten only enough to "dimple" the plastic disc.. and no further. You may need to shim your firewall-mount to accommodate the slight protrusion.. but you'll gain a usable backplate/carb for your Bee. Smile

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Re: Bee backplate screw-sealing

Post  NEW222 on Wed Aug 02, 2017 6:14 pm

I am really liking this idea. I cannot wait to see how they work out. Never thought of this, and the other methods I tried were a little harder to do.
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Re: Bee backplate screw-sealing

Post  KariFS on Thu Aug 03, 2017 3:21 am

I like this idea too. Previously these have been sealed with rtv or such, but this way the assembly is less messy (I always seem to make a mess when working with silicone sealants) and disassembly is much easier.

The edges can easily be cleaned up with an X-acto after tightening the screws.

Great idea again Roddie!
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Re: Bee backplate screw-sealing

Post  akjgardner on Thu Aug 03, 2017 5:15 am

Yep, This is good , Sure beats the messy red rtv fix
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Re: Bee backplate screw-sealing

Post  RknRusty on Thu Aug 03, 2017 7:43 am

Another one that works well for sealing the backplate screws is to wet a piece of twisted cotton string(Ken's suggestion, I think) or Dacron flying line or similar string and put a wrap or two around the neck of the screw. If you're like me, I have old partial spools of Dacron in every other drawer and corner of the shop and flight box. It's quick and convenient to use the same thing for sealing your tank rim and screws too.

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Re: Bee backplate screw-sealing

Post  NEW222 on Thu Aug 03, 2017 5:06 pm

RknRusty wrote:Another one that works well for sealing the backplate screws is to wet a piece of twisted cotton string(Ken's suggestion, I think) or Dacron flying line or similar string and put a wrap or two around the neck of the screw. If you're like me, I have old partial spools of Dacron in every other drawer and corner of the shop and flight box. It's quick and convenient to use the same thing for sealing your tank rim and screws too.

I had been using the cotton wrapped around the screw trick myself. Only problem, like using teflon tape, is I somehow always wrap it teh wrong way first! lol.
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