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Thread: LAM 2 O ring for plunger

  1. #1
    Boolit Bub HP9MM's Avatar
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    LAM 2 O ring for plunger

    What size is that O ring? Mine has worn and needs replacement as it won't seal.
    I got one from an auto parts store and while the right inside diameter, it is not thick enough to seal the piston. RCBS with their great customer service is sending me one but in the mean while I would like to have one sooner.

  2. #2
    DOR RED BEAR's Avatar
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    I am not really sure but if no one answers i will check in the morning.

  3. #3
    Boolit Master
    Winger Ed.'s Avatar
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    I take the old one to a hardware store. They usually have a display where you can match it up.

    I've had to get a smaller, fatter one that will stretch to the right size a time or two.
    Everyone can learn from their mistakes.
    However; it's less painful, and cheaper to learn from the mistakes of others.


    Old age and treachery will always overcome youth, and skill.

  4. #4
    Boolit Master Petander's Avatar
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    Those O-ring assortment packs cost very little,I have found my replacements that way.

    I don't know about numbers though.

  5. #5
    Boolit Buddy Land Owner's Avatar
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    Look closely at this Illustrated Parts List for the "O"-ring size. It has been so long since I added that to my IPL. IDK why there are three "dimensions", but that is what it says on the Ace hardware drawer for that ring.

    If it was easy, anybody could do it.

  6. #6
    Boolit Master Maven's Avatar
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    Arrow

    The hardware store would be an option as well, but RCBS has changed vendors and the new O-rings aren't quite the same as the old ones. In short, I'd telephone RCBS and ask for a complete threaded rod + plunger + O-ring assembly since the threads and plunger/piston have also varied over the years.

  7. #7
    Boolit Master Traffer's Avatar
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    HF has boxes of o rings. I think 6 or more different boxes of various sizes. Get a assortment box of o rings for $5 to $10. I got a box of 225 Nitrile O rings for $5. They have bigger boxes for up to $10.
    Here is one that might have what you are looking for:
    https://www.harborfreight.com/382-pi...ent-67554.html

  8. #8
    Boolit Bub
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    At an Ace Hardware the part # 02-1533 should be what you are wanting

    TGM

  9. #9
    Boolit Master

    gwpercle's Avatar
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    Quote Originally Posted by Land Owner View Post
    Look closely at this Illustrated Parts List for the "O"-ring size. It has been so long since I added that to my IPL. IDK why there are three "dimensions", but that is what it says on the Ace hardware drawer for that ring.

    1 1/16" is the outside diameter

    17/16" is the inside diameter

    1/8" is the thickness of the O-ring material itself.

    Take the plunger with you and find a replacement....buying an assorted pack of 50 O-rings leaves you with 49 useless O-rings .

    #16....I don't know
    Gary
    Certified Cajun
    Proud Member of The Basket of Deplorables

  10. #10
    Boolit Buddy Land Owner's Avatar
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    #16 - that could be the "parts bin" number, idk...TGM may be on to something.
    If it was easy, anybody could do it.

  11. #11
    DOR RED BEAR's Avatar
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    Sorry never got back but realized i am out except the one in my lam and it ain't in the best shape. Guess i need some to.

  12. #12
    Boolit Master
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    Quote Originally Posted by Traffer View Post
    HF has boxes of o rings. I think 6 or more different boxes of various sizes. Get a assortment box of o rings for $5 to $10.
    Those cheap O-ring kits are pretty much a waste of money. I bought one and just about every ring in there is slightly undersized. I found that out the hard & messy way when I used some of them in the cylinders on a small loader on a big garden tractor. That's a low pressure system compared to "real" hydraulics, probably less than 1,000 psi. First time I put a load on it I felt like Jed Clampett, oil everywhere. Bought the necessary rings from a hydraulics shop and no more problem.

    Sure is fun tearing four cylinders apart two days in a row. The rest of them are still sitting on a shelf and will remain that way until I get in "throw out the junk mode".
    Literacy should not be considered optional in computer based communication.

  13. #13
    Boolit Buddy
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    Quote Originally Posted by gwpercle View Post
    1 1/16" is the outside diameter

    17/16" is the inside diameter

    1/8" is the thickness of the O-ring material itself.

    Take the plunger with you and find a replacement....buying an assorted pack of 50 O-rings leaves you with 49 useless O-rings .

    #16....I don't know
    Gary
    17/16 = 1 1/16. The size should read 13/16

    Convert all the ⅛ fractions to sixteenths, then add the inner diameter plus two ring thicknesses to equals the overall outer diameter of the ring of 1 1/16
    Last edited by greenjoytj; 07-23-2019 at 08:29 AM.

  14. #14
    Boolit Buddy Land Owner's Avatar
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    That clears it up. Thanks.
    If it was easy, anybody could do it.

  15. #15
    Boolit Master

    Hickory's Avatar
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    I just picked up two at my local NAPA store they were a little fat in diameter but fit great.
    When I asked what I owed him the guy shooed me off with his hand and said, "Get outta here."
    So, I did.
    Political correctness is a national suicide pact.

    I am a sovereign individual, accountable
    only to God and my own conscience.

  16. #16
    Boolit Buddy Land Owner's Avatar
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    Woo Hoo! Free! the salesman couldn't "see" ringing up a $0.50 sale.
    If it was easy, anybody could do it.

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