Reinder Posted February 2, 2020 Posted February 2, 2020 Hi, Bought a nice lot yesterday with some interesting technic parts. My five year old started building right away and was very interested in the pneumatic cylinders that were in there. But as it goes with five year olds, he was also a little too excited with pumping away the cylinder and that resulted in the seperation of the piston and the cylinder. It does not look to be broken off, but I'm not sure if it's fixable or not. I want to try to repare it, but I don't know how to open it. I've seen some posts about opening the cylinder but they are always the later versions. This is the red one which was only in one set: 8040 building set. (part number 4688c01) Does anyone have some tips about opening it and if it's reparable or not? Thanks! Quote
allanp Posted February 2, 2020 Posted February 2, 2020 Unfortunately I'm pretty sure these first generation cylinders are glued together. However the top seal doesn't need to be airtight because they are only single acting (there is no top seal) so you don't need to worry too much about damaging it, and you'll have to glue it back together anyway. Quote
Reinder Posted February 2, 2020 Author Posted February 2, 2020 Ok, thanks. I'm still not certain how to open it. But I now know it won't go in an easy way Quote
andythenorth Posted February 3, 2020 Posted February 3, 2020 (edited) It's two parts, the top cap is separate, but they are glued and not easy to remove. I did it many years ago, but can't remember how. There was an unsuccessful attempt, which sliced the top cap off permanently. There was a partly successful attempt, which might have used something to soften the glue, but I can't remember what (solvent, heat, hot water, can't remember). At minimum, the part ends up heavily marked, and can't be reassembled perfectly . The starting point is the line between the top cap and the cylinder, patiently use a scalpel (x-axcto knife) to open up the gap and try to break the glue connection, then lever the cap upwards patiently. It's not easy. Edited February 3, 2020 by andythenorth Quote
kieran Posted February 3, 2020 Posted February 3, 2020 Good luck opening that, will not be easy Quote
Reinder Posted February 3, 2020 Author Posted February 3, 2020 Thanks everyone! I just found another red pneumatic cylinder in the lot! So I think I’ll skip trying to open the other one for now. Until my son get’s hold of this one Quote
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