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  1. #1
    West Texas RXP skoepp's Avatar
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    Replacing Valve Stems Seals

    When removing valves how often should the valve stems need to be replaced?
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  2. #2
    Stockrxp's Avatar
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    Every 10 hrs

  3. #3
    rangermtb5's Avatar
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    I changed mine at about 100 hours when I did valves. They are cheap enough - may as well since you're going in there

  4. #4
    West Texas RXP skoepp's Avatar
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    Quote Originally Posted by rangermtb5 View Post
    I changed mine at about 100 hours when I did valves. They are cheap enough - may as well since you're going in there
    On my 3rd set.
    I have replaced them every time my head has been appart.
    The set I just had in head were less then 30 hours.
    The set in the pics above were also less then 30 hours.

  5. #5
    monaroman76's Avatar
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    The manual says everytime. IMO I'd only think about doing it if they were up around 100 hours or so.

  6. #6
    Nothin' better than Doo'in it! BigDaddyRXP's Avatar
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    Why do you pull your valves so often

    Those seals are good for a lot of hours..... but I would definitely replace them if you have the valves out, and they have 100+ hours on them. Otherwise.... just save some cash, and swap em out in 30 hours when you have the valves out again

  7. #7
    West Texas RXP skoepp's Avatar
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    Quote Originally Posted by BigDaddyRXP View Post
    Why do you pull your valves so often

    Those seals are good for a lot of hours..... but I would definitely replace them if you have the valves out, and they have 100+ hours on them. Otherwise.... just save some cash, and swap em out in 30 hours when you have the valves out again

    No shit, I ask myself the same thing?
    First time was when upgrading my valve train, head ported, 3 angle valve job, with new valves obviously.
    2nd time was about 15 hours latter when i spun a rod bearing in #1 wanted to check # 1 valves for contact.
    3rd time was last winter for no reason really,
    And now this time because my riva pistons made contact.

    The only reason i ask as the head shop thinks they should be replaced and I think they are just being overly cautious.
    They are 7 bucks and you need 12 plus shipping and tax. Just kill another bill.

  8. #8
    SPEED JUNKIE! buickbrian's Avatar
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    If your doing a valve job or surfacing you need to replace. you cant get the metal particles out between the guide and seal. If your just putting springs or retainers on. No need to change unless atleast a 100 +hrs. They are kinda hard to remove without messing them up. If your just looking at a valve this time you should not need to replace. Unless they tore it. Thats my 2 cents. 7 bucks a piece kinda sucks. I know how you feel

  9. #9
    West Texas RXP skoepp's Avatar
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    Quote Originally Posted by buickbrian View Post
    If your doing a valve job or surfacing you need to replace. you cant get the metal particles out between the guide and seal. If your just putting springs or retainers on. No need to change unless atleast a 100 +hrs. They are kinda hard to remove without messing them up. If your just looking at a valve this time you should not need to replace. Unless they tore it. Thats my 2 cents. 7 bucks a piece kinda sucks. I know how you feel
    Thanks for the reply.
    there surfacing the valves/head and removed them.

  10. #10
    alex29573's Avatar
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    does the head have to be taken off to replace the stem seals?

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