What Were They Thinking to Remove Cylinder

The end of the stick squeezes the leather kind of.  You could soak the leather in water for a little while?  IDK  I use a similar one for oil changes in the car.  The rubber strap stretches a bit too much but it usually works well if the part is not too tight. In any case, if you have the tools to mill flats on the cylinder later, it is really the best.

aspeed wrote:The end of the stick squeezes the leather kind of.  You could soak the leather in water for a little while?  IDK  I use a similar one for oil changes in the car.  The rubber strap stretches a bit too much but it usually works well if the part is not too tight.  In any case, if you have the tools to mill flats on the cylinder later, it is really the best.  

Yes indeed this is what I am contemplating i.e. cutting the flats on the top fin myself, but with my manual abilities that are a bit less than those of the Neander Valley cave man, I already see myself jumping around cursing that I have completely messed up a vintage stock cylinder....

OVERLORD wrote:I didn't have any luck with such a strap neither. To remove the cylinder, I clamped the cylinder in one end of a vice with hard rubber protection pieces. Then I heated up the crank case and turn the crank case with your hand and a rag. On the other side of the vice, I clamped at the same time another cylinder. The reason I clamped it on the vice's side is because then it's possible to see wether the cylinder would still turn or not.

Thanks, good idea indeed, maybe I will try with an old defunct cylinder to check if the rubber padding of the vice will really prevent distortion of the cylinder fins..

balogh wrote:

OVERLORD wrote:I didn't have any luck with such a strap neither. To remove the cylinder, I clamped the cylinder in one end of a vice with hard rubber protection pieces. Then I heated up the crank case and turn the crank case with your hand and a rag. On the other side of the vice, I clamped at the same time another cylinder. The reason I clamped it on the vice's side is because then it's possible to see wether the cylinder would still turn or not.

Thanks,  good idea indeed, maybe I will try with an old defunct cylinder to check if  the rubber padding of the vice will really prevent distortion of the cylinder fins..

Hi Andras
I have cut a number of cylinder top fins with a hacksaw in a vice. You can cut them so carefully that they look as good as the factory cylinders with that top fin cut. Only thing is the end of the cut is aluminum color not black anymore. Works really good.
Iceberg

Brownells Formula 44/40 is good for the bluing cylinder.

Darren, Levent thanks for the encouragement. Maybe I will try on a worn out cylinder. Yes I use gun blue on my cylinders regularly!

Regarding a leather strap, it is all about getting the length just right and one can also place a fine emery cloth around the cylinder for extra grip. Preheating the crankcase also helps.

Below is how I typically use it, apply some pretension to the strap (with the thumb) and as you apply more torque the leather band will tighten more and more. Here I picked up an old and used golden bee from the box of coxes, and I could easily remove the cylinder without pre-heating the crankcase:

Yes Kris this emery cloth may be the key..then some gun blue to restore the nice COX cylinder color

Or knurl the cylinder like the Foras. Maybe use some pliers to get some marks in the fins for grip. OH, NO never mind.

balogh wrote:Yes Kris this emery cloth may be the key..then some gun blue to restore the nice COX cylinder color

I'm using 1000 grit and one can turn the grainy side towards the leather, so there should be any marks on the cylinder at all.

Black widow cylinder pré 96 wit is tool marks that cylinder was performing very Good now wit new piston crankcase and schaft tank wit plastiques back plate now Not so Good just its ventury size????
Wil try To fix engine To its oem part exept for its piston and crankchaft hd crank??? For black widow??

Gents-to those of you struggling (and I exclude surfer kris as he's shown his leather strap wrench works fine for him)-here is the answer to your problems-and it works on damn near any engine with a screw in cylinder and or head: https://www.micromark.com/Non-Scratch-Plier

You might think it a bit pricey...but how many wrecked or damaged cylinders will you accept before it becomes value for money?......and it will last a lifetime. I'm not a betting man....but if you were to print off the photo from the micromark website, take it in to your local toolstore or auto accessory shop and ask 'have you got something like this?' or 'can you get in something like this?' you might be pleasantly surprised...

Alternatively-if you have access to a machine shop-and specifically an internal cylinder grinder-get youself a suitable pair of pliers, grind off the teeth to create a smooth, circular internal jaw profile when closed-and glue a thin leather strip in this new circular interior surface. should last for years-and the leather will be replaceable once it gets a bit worn. Even old fashioned pincers could be adapted this way...

ChrisM
'ffkiwi'

Now isn't that a tool worth having. And seeing it it would be very easy to replicate from an old pair of pliers.

Channel locks and an appropriately sized rubber hose cut open so it can wrap around the cylinder. I've done that before.

getback wrote:That's a interesting website Chris , never seen this place before I use the rubber hose trick alot ,but will still marr a cyl. if not heated sometimes > wish i had thought to cut the hose LOL

I discovered it many years ago (decades ago!)-and have become an occasional customer many times since.....mainly I buy clever tools off them....the postage to New Zealand tends to be a bit of a killer....which helps keep my enthusiasm under control!..... They do seem to have a strong bias towards model rail, and that side of modelling, but their overall product range is quite comprehensive....and they often have sales....which is when I usually succumb to temptation...

ChrisM
'ffkiwi'

Goodaye All,

I have returned to Cox engines and CL after a 40 year rest from it. :-) and am thoroughly enjoying all aspects of researching, learning, reading, building my own designs, crashing, fixing and trying again. I was reading this thread and maybe a couple of others on the forum that seemed to mention this issue, and must say it also concerned me, as it seemed less than average to say the least.  Maybe I am not understandintg the issue properly, or maybe its only with older engines, but I recently bought a number of new engines from Bernie including  TEE DEE 049, and SureStart 049 with the two slit exhausts.

On all of the engines I have, the top of the barrel just below the glow head has machined flats and the Cox tool fits perfectly and with one tool holding the cylinder and another on the glow head it is very easy to remove the glow head and subsequently the cylinder if needed. The colour of the machined flats on the cylinder is the same as the rest of the cylinder, so it appears to be designed in.

Maybe the cylinders design has been changed again as I dont have the problem with motors bought from Bernie in the past two months, or maybe Im missing the point of the thread.  I bought spare cylinders but they are not where I am at the moment, so I cant check them. I hope they also have the machined flats!!

Cheers,
Gary

Gary, COX began cutting the top fin for the wrench in the 2nd half of 1970-s and since then all cylinders have the flats on them.

balogh wrote:Gary, COX began cutting the top fin for the wrench in the 2nd half of 1970-s and since then all cylinders have the flats on them.

Before the flats on the top of the cylinders, and before using the "strap" method, I used the "forked end" of the Cox wrench and inserted the U-shaped (fork end) into the exhaust ports (with the piston at dead bottom center) and unscrewed the cylinders that way. I thought that what that U-shaped end of the Cox wrench was for? It did fit pretty tight when run across the exhaust port?
Though it did mess up the outside diameter of the exhaust port a little.

You used the fork the correct way. If the fork slips though you are about to produce a burr inside the cylinder that is not easy to remove. With the old stock COX cylinder availability on the market dwindling, I always think twice before using the fork. Once I have a cylinder removed I clean the threads and add silicon oil in hopes it will not cake like castor and allow easier removal next time.

Cox wrenches are cheap stamped sheet metal tools, and can damage cylinders if used to remove them from the crankcase (by sliding the tool across the exhaust ports)! Very bad idea anyway and most likely the reason Cox went to the milled top fins in later production.

I seldom use them on my engines, though the TD collet hook and glow head portion can be used if careful. Since your usually removing a burned out or questionable glow head anyway you don't worry about looks.

The problem is the burrs and rough edges of the Cox tools, not to mention the loose tolerances of the stampings.

My preference for screwed in cylinder removal is a simple strap wrench, easy to make, and very low cost. Nothing is better for that task, and one tool can fit a wide range of engine sizes.

Bill

smooth_bill wrote:Cox wrenches are cheap stamped sheet metal tools, and can damage cylinders if used to remove them from the crankcase (by sliding the tool across the exhaust ports)! Very bad idea anyway and most likely the reason Cox went to the milled top fins in later production.

I seldom use them on my engines, though the TD collet hook and glow head portion can be used if careful. Since your usually removing a burned out or questionable glow head anyway you don't worry about looks.

The problem is the burrs and rough edges of the Cox tools, not to mention the loose tolerances of the  stampings.

My preference for screwed in cylinder removal is a simple strap wrench, easy to make, and very low cost. Nothing is better for that task, and one tool can fit a wide range of engine sizes.

Bill

Bill,
The smaller Enya engines (Enya .049 / .06 / .08 / and .10) use a wench that is similar to the Cox wrench, but they are twice the thickness of the Cox wrench and the fit in the exhaust port is a tight fit. It is even tough to get the wrench into the exhaust ports to remove the cylinder head.
The two bent ears on the other end is to remove the head with the glow plug installed. If the glow plug is removed, then you can use the long "side of the wrench" to get more leverage.

Also, the holes in the middle of the wrench is to tighten/loosen the prop nut, the other is for tighten/loosen the glow plug