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Cox Engine of The Month
February-2024
1/2A Nut's

"RC Speed Boat Power Drive TD .020"

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Post  NEW222 Fri Feb 02, 2024 10:39 pm

So I was just surfing the 'Book Of Face' and came across a post in which a person was sorting through his fathers stuff and posted the following pic asking if there was any value to 'these'.....

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Post  GallopingGhostler Sat Feb 03, 2024 2:25 am

With such a great quantity, he may want to contact Bernie @Cox International and/or Matt @ExModelEngines . Although wholesale, he might get a better deal overall, plus they could benefit the community by reselling to meet other's needs in return.
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Post  Ken Cook Sat Feb 03, 2024 6:07 am

There are two styles of wrenches in there that are useful. The zinc plated one which is thicker and has the wide end that fits the top of the cylinder which utilizes flats. This wrench fully surrounds the plug. The other is the narrower fork which fits the exhaust port and has the two pin spanner hooks. The black Cox wrench is a POS which not only ruins your engine, it can easily injure the user. It slips, it ruins the glow plugs, the screwdriver end which is supposedly for tightening the prop screw is useless. The spanner portion doesn't fit correctly which also destroys anything you use it on.The U shaped portion doesn't fit the flats on the cylinder and if the forked end is used on a cylinder, it will surely ruin it. A clear case of fixing it until it's broke. Obviously, the older wrenches worked and cost more. We certainly couldn't have that.
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Post  GallopingGhostler Sat Feb 03, 2024 11:07 am

Ken, the earlier wrenches were probably during Leroy Cox's watch, he was a stickler for quality. Too bad he got stuck like other manufacturers in the electric slot car fad that quickly faded, left him with much unsellable useless inventory.
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Post  Admin Sat Feb 03, 2024 12:34 pm

I bet quite a few of us here have a tub of wrenches like that.

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Post  NEW222 Sun Feb 04, 2024 8:10 am

Interesting tidbits about the wrenches.
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Post  GallopingGhostler Sun Feb 04, 2024 11:51 am

I think I may have one of those shortened wrenches from the late 1970's. Jacob's comment about "too short", could that have been destined for another faceted part of a Cox .049? It already has the cut-out for the cylinder flats, so end portion would not be needed to insert into exhaust ports for removal.

Popcorn Clean my glasses lol!
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Post  Admin Sun Feb 04, 2024 2:23 pm

I have a few of those wrenches that have the exhaust slot end too short. I always thought it was a manufacturing error. They are stamped with a part number of 21530, whereas others are stamped with a part number of 1530.

Wrenches Anyone?????? Img_1011

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The one that is too short fits in the exhaust of an early thin wall cylinder, but it doesn't go in enough to overhang. It would apply pressure to wall of the cut, potentially causing a dent in the cylinder wall or slipping and causing a burr. Making me nervous just looking at it.

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With a later thick wall cylinder, the later wrench fits it well.

Wrenches Anyone?????? Img_1015
However, this silver wrench doesn't go in enough to overhang to backside of the ports, so it would apply pressure to the wall of the cut, and would be easier to slip with.

Wrenches Anyone?????? Img_1017
The wrench that is "too short" is also too narrow to even fit a thick wall cylinder.

Wrenches Anyone?????? Img_1010


This appeared in the QRC manual from the late 70s:

picture not loading, contact the admin if you can read this text

It's best to not use the exhaust openings at all remove or install a cylinder. A leather strap or blocks of wood in a vice being a better option.


Last edited by Admin on Sun Feb 04, 2024 2:30 pm; edited 1 time in total

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Post  Admin Sun Feb 04, 2024 2:28 pm

This is what happens when you use one of those wrenches that are too short:

Wrenches Anyone?????? Img_9715
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As posted about here: https://www.coxengineforum.com/t17490-1956-babe-bee-score#226460

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Post  rsv1cox Sun Feb 04, 2024 3:42 pm

Great picture tutorial Jacob.  

I would add that anyone attempting to remove the cylinder or the glow head without applying heat first is inviting trouble.  

Cox wrenches, some of us are so reverent of them that we even frame and hang them on the wall.  Smile

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