Discussion in 'Fettling Forum' started by Surveyor, Aug 22, 2020.
Thanks for that, will have a go always willing to learn
Got the new NRV fitted did a pressure test and bubbles are coming out of the pump, stupid question but would the NRV housing have a washer?
There should be a lead or nylon washer between the nrv and the bottom of the pump tube.
Thanks, i did buy a kit from fettle box and have a few spare, looking at the end when i removed it and nothing there, just hope the old one stuck in the tube
Some stoves were put together, the very first time, with no washer on the NRV. I’m not sure about Burmos.
If there was no washer, use one. If you can’t see the washer, gently poke the bottom of the pump tube to see if there’s a lead washer there.
Tony thanks for the information, i find it easier with the MoD stoves, re the washer i have an endoscope so i can look down the tube
No signs of a washer in the tube, i have 2 washers in the kit, one has a metal ring around it which fits over the threads the other one slides down but dosent fit over the thread, think this is the one to ease over
Look through the pictures 70622 and 70633 and you will see the lead washer:
Got the washer in and a very small amount of bubbles think I can live with that
Think the lead washer if any, as can't see any thing using endoscope, has jammed in the tube as it does not appear on the nvr not sure how to get out
Hi @Surveyor It should be relatively easy to remove the lead NRV washer from the bottom of the tube using a length of wire with a bend on the end to form a hook. Alternatively a pair of artery forceps can be used..
Many thanks think will leave that till next weekend
Tried both methods to remove the lead washer, then put Borescope down to see what's there, looks as lead washer does not lip over hole to hook.
Any suggestions please.
I dig em out with a watchmakers screwdriver if necessary I have a knackered one just for that! Or is it I have a knackered one because of that?
“O-ring” removal picks or a similar improvised tool:
6pc Long Pick & Hook Set O Ring Seal Remover With Soft Grip Anti Slip Handle 5055143919141 | eBay
Kerophile, Thanks, just ordered a set, showed my daughter the set and she wants them for her jewellery making
Hi @Surveyor. Good luck with your “fishing”. It is likely that the shiny lead washer we can see in the borescope image is sitting is a machined circular groove in the base of the pump tube. It need to be hooked out from this seating to allow a new washer to be substituted.
Have a look at the photos in this thread to get an idea of what you are working with:
Pump tube/NRV assembly
Many thanks, will have a go when they arrive, hope can get both scope and hook in at same time to see what going on
The tools arrived at the weekend, remind me of a scene in "The Mummy" where they are in the preparation chamber, started having a go and bits of black particles are coming out, bit like burnt carbon, have another go when more time next weekend
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