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Thread: Resealing a PCP - to lube or not to lube the o-rings?

  1. #1
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    Resealing a PCP - to lube or not to lube the o-rings?

    Hello knowledgeable gang,
    I will reseal my FN19 soon. Do I need to put a very small amount of silicone grease/oil on the new O-rings or do I leave them dry?
    Cheers
    WANTED: Next weeks winning lottery numbers :-)

  2. #2
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    Lube

    I always use a smear of Molycote on O rings , It just makes it easier !

    Cheers Crowbar

  3. #3
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    dont

    leave them dry.

  4. #4
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    I always use the lightest smear of vacuum grease that I can, that is rub a small amount between your fingers and then over the o-ring.

  5. #5
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    Definately lube them using a very small amount of silicone grease. If you don't, you risk cutting them during installation and also not seating correctly.
    Happy Shooting!! Paul.
    "We cannot solve our problems with the same thinking that we used when we created them" - Albert Einstein.

  6. #6
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    I use Abbey SM50 just the slightest smear

  7. #7
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    Lube um up.

    Quote Originally Posted by Loki_79 View Post
    I always use the lightest smear of vacuum grease that I can, that is rub a small amount between your fingers and then over the o-ring.
    Exactly what I do.... including the vacuum grease.

  8. #8
    barrel's Avatar
    barrel is offline Work is the refuge of people who have nothing better to do
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    Quote Originally Posted by Loki_79 View Post
    I always use the lightest smear of vacuum grease that I can, that is rub a small amount between your fingers and then over the o-ring.
    Exactly more is less, don't over do it.

    Kindest regards


    Barrel
    IF I WALKED ON WATER PEOPLE WOULD SAY I COULD NOT SWIM !

  9. #9
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    Cheers chaps.
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  10. #10
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    Quote Originally Posted by Loki_79 View Post
    I always use the lightest smear of vacuum grease that I can, that is rub a small amount between your fingers and then over the o-ring.
    ^^ this^^

    If dry there is a small risk that they could snag/grip & tear, but you only need enough lube (molykote 111 or similar) to just put a shine on the surface.

  11. #11
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    Lube otherwise they can roll and twist when you slide the front and rear blocks into position.

  12. #12
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    I've regularly use silicone grease on the o rings for my wife's BSA ULTRA charging probe as it helps prevent air leaking during the charging process and it prevents the o rings perishing - so in short definitely use the silicone grease on o-rings if you want to preserve them/maintain it performance.
    Weihrauch HW97 .177, Weihrauch HW80 .22, Weihrauch HW77 .22

  13. #13
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    Just a smear of SM 50 on the O rings. The exception for me is in the REG of my HW 100 where one O ring was advised to be left dry.

    A.G

  14. #14
    secretagentmole Guest
    Quote Originally Posted by lensman57 View Post
    Just a smear of SM 50 on the O rings. The exception for me is in the REG of my HW 100 where one O ring was advised to be left dry.

    A.G
    Oooh you'll upset 'em saying that, we all know that the HW100 does not have a reg in it, despite them fitting one!

  15. #15
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    Dow Corning MS4. if you leave it long enough to settle you get oil and grease. i worked with it long enough.
    the oil that floats to the top will waterproof the bluing better than any shop bought anti waterproof oil.
    just a bit of info on molly. did you know the the roll up cabs on lorries use it.
    the only thing i can find wrong is the nut on the steering wheel.

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