Creality CR-6 SE heatblock replacement

Question

Recently I broke the threads inside the heatblock of my CR-6 SE by tightening the nozzle too much (it seemed not deep enough). No problem - bought a new hotend extruder kit for around 35 euros.

I put everything back together and it worked for some time. But then the real problem started - PLA is squeezing out of the heatblock below (probably through the threads of the nozzle) and above (on the metal tube). I'm pretty sure that the PTFE tube was deep enough in the hotend and the nozzle was placed correctly.

That's especially bad as it clogs the screws fixing the thermal sensor and heating element in position as well as the ones connecting the heatblock to the heatsink (red) (the 4 screw holes around the nozzle on picture 2).

I managed to remove the screws of the thermal sensor and heating element, but I'm unable to remove the elements themself from the latest heatblock. I'm also unable to remove the metal tube (throat?) screwed into the heatblocks of the old and the current one, as I have nothing to grap to.

I already have original Creality replacement blocks, but no idea how to continue.

Questions

1. Is there a chance to remove the metal tubes?
2. Are there other ideas how to resolve the problem without buying a new hotend-kit?

Any help is appreciated!

Answer 1

It appears that you tightened the nozzle up against the heater block. You want the nozzle to tighten and form a seal with the heat break. Otherwise material with seep between the heater block and heat break. Thus, material comes out the top of the heater block. You want to tighten the nozzle against the heat break at your highest operating temperature of the hot end. The following is the full procedure. Once you have plastic material in the threads, you will need to heat up the heater block to remove or install threaded parts in the heater block.

How to replace the nozzle in my hotend assembly?