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Rm8 Leaking Regulator

Discussion in 'Technical' started by UKRodgers, Oct 16, 2018.

Tags:
  1. UKRodgers

    UKRodgers Member

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    Location:
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    Hello, a friend of mine has an RM8. It has served him well and plenty of rabbits have gone to rabbit heaven after a meeting with his rifle. However, it has started to leak air from the reg and after a few days, it is empty. He uses a pump so it's a real pain to keep pumping it up from empty. Is there anyone around that services or repairs these regulators? If so how much and how long does it normally take? Thanks in advance.
     
  2. mikeyhall1

    mikeyhall1 2018 Forum Nice Guy - Pepe Le Pew

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    As far as I’m aware the RM8 doesn’t have a regulator.....

    It will be a seal else where for sure. Maybe @cloverleaf as he’s not too far away?
     
    cloverleaf likes this.
  3. Jeffsy

    Jeffsy BASC Member

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  4. cloverleaf

    cloverleaf Super Moderator Staff Member Mod/Admin

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    The RM8 does have a reg, although I'm yet to be convinced by how capable it is.

    If it's leaking from the reg it's probably from the vent hole so a piston O-ring. I'm buggered for facilities currently but if it's just a strip and seal chance I might be able to help.. although I'm a fair way from middlesex.

    I don't have the facility to set up the reg pressure on these guns though as I've not had any demand to warrant getting the appropriate apparatus made, although if the regs are anything like those used in the "Hammerli" (also Umarex) AR20 the only way to adjust output pressure is to shim them, which would be laborious and hence expensive. As such the best way to go might be to replace the seals and carry on regardless if the gun continues to function acceptably.
     
    Last edited: Oct 16, 2018
  5. mikeyhall1

    mikeyhall1 2018 Forum Nice Guy - Pepe Le Pew

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    Jeffsy likes this.
  6. Redlion55

    Redlion55 Newbie

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    Hi all, Just to add an update to the leaking regulator issue (yes it does have a regulator). Bought mine new in March 2016 and only use in my garden (big garden) for defence against pests so probably had less than 1k pellets through it.
    Mine started leaking from the vent hole last week, in a call to Bagnalls I was told that it was not repairable and could only purchase a new regulator as part of the complete assembly between the receiver and bottle, cost £280. Found a local air gun smith who said he had a few before with the same problem which he was able to fix by replacing a seal or two, however walther have stopped supplying the seals which made the job a little harder as a compatible seal had to be identified and sourced. A week later I now have the rifle back fixed at a cost of £65. So the regulator can be repaired. Hope this is helpful for anyone facing the same problem.
     
    Last edited: Jun 8, 2019
    UKRodgers, talent, sharpsman and 2 others like this.
  7. Brooksy

    Brooksy Posting Addict

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    That's a pretty poor attitude from Walther, £280.00 is all the RM is worth second hand!
     
  8. Lord Williams

    Lord Williams Member

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    Hi guys/gals, I've just joined the forum with this exact issue. Air leaking from the regulator vent hole. I've stripped mine down and the washers inside seem to be randomly stacked. Are the meant to sit inside each other or face opposite? ie dish in dish or dish opposite dish?
     
  9. Redlion55

    Redlion55 Newbie

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    The washers are stacked in a set order, if you are going to disassemble these you must make a note of the order and orientation so they can be re-assembled to give the same force. If you are replacing the o-rings inside the regulator it would be very helpful to other if you could post the sizes required, and a detailed "how to" would be extremely helpful to others as it did not seem obvious to me how the regulator was removed due to the apparently captive bolts that hold it to the receiver. Cheers.
     
  10. Lord Williams

    Lord Williams Member

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    The washers were all exactly the same, about 8.
    I put them back in alternating the way they're dished. This was how I found them. The O ring on the centre rod is shot. I've called my local gun shop and they've quoted £150 trade price for the regulator. Seems steep for such a simple part. Looks like a simple O ring replacement will fix it. 20190918_164844.jpg
     
    Redlion55 and sharpsman like this.
  11. Bozz

    Bozz Engaging Member

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    Location:
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    Hi there if you go onto bagnell and Kirkwood site they do a complete o ring set for the RM8 , they also show you an exploded diagram of the regulator it's on the general exploded file drawing that you have to down load to see very clear. Look under spares by manufacturer and you should find it. I hope this helps Graham
     
    talent, The oil man and Redlion55 like this.
  12. Lord Williams

    Lord Williams Member

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    15688778290978645140816014079342.jpg
    Right. Found the offending O ring. I'm wondering if the O ring kits cover the regulator as well?

    15688779510393525290425332618812.jpg
     
    talent and Redlion55 like this.
  13. Redlion55

    Redlion55 Newbie

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    I take it that the offending o-ring is the small black one shown in the second image above.
    In the conversations that I had with the gunsmith who fixed my regulator he made it clear that the offending o-ring was not available as a separate spare part from Walther or its agents. That situation may have changed in the last 4-6 months since my experience and it would be extraordinary if Walther were to maintain their very unhelpful stance of preventing any maintenance on the regulator as it is the case any regulator will need maintenance at some time. Well done and thanks for your helpful info on this as it would seem that this issue is a flaw in the design of this otherwise very capable air rifle.
     
  14. Lord Williams

    Lord Williams Member

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    I've ordered the £13 complete set of O rings from Ebay. The shop said the regulator O ring is included and that mine had squared off with use. I sent a photo to be clear that the O ring I wanted was included. They're available from most online 0 ring suppliers, £2.80 plus vat for 2.
     
  15. Bozz

    Bozz Engaging Member

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    Location:
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    Hi if you need the belville washers then Robert Lane Regulators stock them for I think £11.95 per set but it doesn't tell you the order of stacking. Hope all goes ok Graham
     
  16. Lord Williams

    Lord Williams Member

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    The washers seem ok Graham, just a bit concerned about the part that stops the flow of air, seems to be a white nylon insert that presses onto the inlet nozzle. Looks a bit rough. I'll see if the O ring sorts the issue first.
     
  17. Lord Williams

    Lord Williams Member

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    Bagnall and Kirkwood O ring kit has arrived. The one circled is what I needed to rebuild the regulator. Just need to wait 3 hours for the thread seal to cure to see if the leak is sorted.
    I put the spring back together like this (())(()) as this seems to be the consensus across the forums.
    20190921_112002.jpg

    I shall report back........
     
    UKRodgers and sharpsman like this.
  18. Lord Williams

    Lord Williams Member

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    So, the spring set like this (())(()) was a no go. Wouldn't fire and completely locked the regulator up. So I discharged the 230 bar tank (slowly) and configured the spring like so ()()()() and now works a treat. No leaks and bang on accuracy. Happy chappy.
     
    UKRodgers, sharpsman and bobbydazzler like this.
  19. RoyBert

    RoyBert Newbie

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    As a Newbie I joined the forum with this 'leaking' problem and find the answers above very informative but before I can do anything I need to access the regulator. I would be grateful if anyone would explain how to do that so I can replace what is possibly a damaged O ring.
     
  20. UKRodgers

    UKRodgers Member

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    Location:
    West Drayton, Middlesex
    Thanks for all the information here. I didn't get any notifications that there were any posts so I thought nobody knew how to do it. Off to tell my mate how to fix his. Thanks for your input chaps. May all your pellets go where you want them to :);)
     

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