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Cox Engine of The Month
October-2020
Jason_WI's

"Pieces and parts RR-1. New crank, rotary valve, and drive plate. Early #1 cylinder. Drilled out golden bee backplate. Battle hardened crankcase and tank."



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Post  Iceberg on Wed Nov 20, 2019 7:41 pm

I have a few of the extended tank Kavan ones as seen in the picture. I know they are only average. They do work and get 10CC of fuel in the tank and they work ok. But I am looking for the screws. Some of the screws I have are too short a bit and vibrate loose unless I use lock tight. Sorry for my ignorance. What is the thread size of these old sewing machine screws? Where are the longer ones available to suit this motor adaptation? They are longer than the 8CC Silver Bee tank screws by about 3/8 +- an inch? I am not saying this is a great setup just trying to make my set sparkle with correct screws.

Thanks Much!
Ice




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Post  NEW222 on Wed Nov 20, 2019 7:49 pm

Screw pitch is 2-56. That much I do know. Howerer, I am sorry I cannot help you with the length.
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Post  ffkiwi on Thu Nov 21, 2019 3:17 pm

About your only option is microfasteners.com.....who do list 2-56 in 1-1/4 and 1-1/2 lengths......one or other of which should allow suitable trimming to the size you need. The catch (there's always a catch!) is they don't have these in filister head format...so you would have to buy socket head and perhaps deepen the backplate recesses where the screw heads go----or buy flat heads and reduce the head diameter on a lathe or using a Dremel.

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Post  Levent Suberk on Thu Nov 21, 2019 3:45 pm

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Post  dckrsn on Thu Nov 21, 2019 4:51 pm

McMaster Carr has a large inventory of 2-56 socket head screws in
lengths up to 2 1/2", and the socket heads DO fit cox backplates.
The screws that came from Kaven are pretty poor, quality-wise, but
the McMaster Carr ones are high quality. I have bought both stainless
and black oxide. Shipping is a little steep, but having them eases the
pain.
Bob
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Post  Iceberg on Thu Nov 21, 2019 10:24 pm

Thanks very much Levent

Excellent link has the exact bolts needed!

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Post  Iceberg on Thu Nov 21, 2019 10:39 pm

One last question. Please bear with me. Is there a metric screw that can be used to fasten the tanks and not use the original 2-56 screws? Anybody know?

Thanks
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Post  ffkiwi on Thu Nov 21, 2019 11:04 pm

Not really-M2.5 x 0.45 has a virtually identical thread pitch-but is noticeably larger diameter....there are obscure metric threads such as 2.2 and 2.3 [see www.tracytools.com]....but you will scour the world trying to find screws in those sizes (M2.2x 0.45 would be a very close match to 2-56!)
You won't find any of the commonly used metric sizes M2, M2.5 M2.6 that will fit in this particular situation unless you're prepared to retap the holes to match-in which case M2.5 is an option

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Post  Iceberg on Sun Nov 24, 2019 7:12 pm

Thanks Chris
Appreciate the excellent and accurate comment on the 2.2 mm screws. I guess sticking with the original size has merit.

Thank you!
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