Injection Nozzle Leakage

[Bladvass]

I need help figuring out why the Injection Nozzle from my 1.7D KY is leaking towards the outside of the engine… no missfire or troubles running.
 From my understanding it‘s just the Injection Needle within it‘s Block, some kind of ring/plate, the spring and distance plates for pressure adjustment. And all of that is torqued together with the upper and lower part of the injectionnozzle housing… which of those parts might cause the leakage or what can i do to stop the leakage? since there are no sealing rings or anything that might be faulty… or are there??!?
 I tought about teflon tape (idk how it‘s called in english: like the kind of tape used for heating elements in your living room) on the housings’ threads but i‘m not sure if it can withstand the heat.

[Aidan]

diesel injectors operate at very high pressures - I would recommend taking it to a diesel injection specialist to refurbish it correctly and safely

[Burtybassett]

I need help figuring out why the Injection Nozzle from my 1.7D KY is leaking towards the outside of the engine… no missfire or troubles running.
 From my understanding it‘s just the Injection Needle within it‘s Block, some kind of ring/plate, the spring and distance plates for pressure adjustment. And all of that is torqued together with the upper and lower part of the injectionnozzle housing… which of those parts might cause the leakage or what can i do to stop the leakage? since there are no sealing rings or anything that might be faulty… or are there??!?
 I tought about teflon tape (idk how it‘s called in english: like the kind of tape used for heating elements in your living room) on the housings’ threads but i‘m not sure if it can withstand the heat.

Could be the seal...but as Aiden said take it to a specialist and get it sorted properly. If you play with an injector and don't know what you're doing, you could cause yourself loads of ££££££ of damage and repairs.