Lower part of the NRV is stuck

I recently restored a Primus type NRV, with new spring, lead washer and viton pip.
After testing the tank i decided to remove the NRV once again. The upper part of the NRV unscrewed just fine and came out together with the spring, pip washer and pip holder.
The problem is that the lower part is still stuck inside.

I guess that whatever was left of the old lead washer is causing this problem.

1. Do you use thread lock (loctite) when assembling your restored NRV:s?
2. Do you have any suggestion on how to remove the stuck lower NRV part. I have tried to gently push the NRV part into the tank using a Chinese eating stick without any luck. ?

Thanks,
Daniel

 

1. No thread lock to NRV threads. Only if you do 'a permanent solution' when you cannot get NRV out anymore.

2. With long flat screw driver you can try to twist old lead gasket out/off from the bottom of the pump. Place the flat part between the lead gasket and the side wall of the pump bottom then twist. Or with long 8mm drill bit you can gently dig out a hole for NRV to go in through the old lead gasket.

 

Did that piece fall down into the tank?
Can you use wire to push it into the tank?

 

@Afterburner
I meant loctite (normal strength) on the internal NRV threads between the upper and lower part of the NRV.
Not on the external threads that locks the NRV to the pump tube.

@snwcmpr
Unfortunately not, I tried a wooden stick to to push it down with no luck.

 

Also upper & lower NRV part joint doesn't need thread lock (normal nor strong one). NRV's have worked over 100 years with pure threads so maybe they will work next 100 years also as they have been working up to now.

 

Hi Daniel,

You might try some heat on it by soaking the whole stove font in a basin of very hot water and then carefully trying to push the remaining part of the NRV out into the tank inside. Probably an obvious suggestion but you might try and get a really good look into the bottom of the pump tube first using a small high power led torch...I use one all the time for things like this and it helps see stuff that I would otherwise miss.

If everything else fails then you can try and remove the whole pump tube complete with the NRV parts still inside by desoldering it....."Berniedawg" has a very good video of this on youtube somewhere. I agree with the other comments about modern thread lock, its just not needed on any aspect of these old stoves.

Hope you find a solution that works, removing old NRVS seems one of the big challenges to fixing old brass stoves.

Regards,
Mike