Stuck Rounded NRV

Any suggestions? I'm sure there is a link to this topic.

Thanks,
Ben

 

Ben

I try to avoid removal of the pump tube if possible. I have used these extractors with success every time I have needed to remove a rounded NRV, with the head needing replacement regardless of removal process.

 

Pump tube soldering

 

Thank you for your replies. The NRV in question is in a 1915 Primus 96. If there is a replacement NRV that will work then perhaps using an extractor would be best. If not then removing the tube seems best. Maybe I'll just leave it as it is since I probably won't be using it anyway.

Ben

 

Being a 1915 96 does add another variable to consider its rarity.

First you could add kerosene to the pump tube and slowly pump through the NRV where the fuel may freshen up the cork pip & help cycle the spring.

Next try the pressure tests and determine best route, if needed.

If your wanting to try the extractors I'm happy to lend mine along with a NOS NRV.

 

This is an uncommon problem.
Old 96 with a stuck NRV.

I would put Kano Kroil in the pump tube and leave it for a few weeks.

Then remove the tube as Kerophile said.

 

Pretty common with the Primus 96 stoves.
Duane

 

It was a joke buddy.

 

@hikerduane
This one is all yours.

 

@z1ulike
I use a long drill 4mm
and an extractor. In less than 5 minutes is out. I removed few rounded NRV after trying all the other ways and losing days.
Let's see if i find the pictures from my earlier extractions
Cheers,
Francisc

 

@Francisc Masec

That is a very good idea. I'll look for the tools.

Ben

 

Here is what I used to do the same thing.
View attachment 287461