Results 1 to 3 of 3

Thread: valve stem seals

  1. #1

    valve stem seals

    why on my new built motor are 2 exhaust valve teflon seals breaking into pieces

  2. #2
    Senior Member RACING JUNKIE
    Join Date
    Sep 2007
    Location
    Belleville, IL
    Posts
    658
    I'm going to guess here...

    Either the springs are rubbing on them, or you have a machine shop who can't setup valve heights correctly, and the retainers are smashing them into the guide.
    -WJ Birmingham

    OneBadGMC.com

  3. #3
    Senior Member RACING JUNKIE
    Join Date
    Dec 2008
    Location
    Sugar Hill, GA
    Posts
    1,365
    Quote Originally Posted by OneBadGMC
    I'm going to guess here...

    Either the springs are rubbing on them, or you have a machine shop who can't setup valve heights correctly, and the retainers are smashing them into the guide.
    x2 Many times the maching shop will cut the guides for a .500 or .531 seal but not reduce the total height of the guide. The valve height will also be reduced when installing new valves. The first time the engine rotates, the retainer smashes the seal.
    Dave
    Dave
    http://www.racingjunk.com/profile/343797
    "All that is necessary for the triump of evil is for good men to do nothing" Edmund Burke


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Email us - Support@RacingJunk.com
Call us - 866.326.9227
Copyright © 2005-2016 RacingJunk.com All Rights Reserved.

Designated trademarks and brands are the property of their respective owners. Use of this Web site constitutes acceptance of the RacingJunk.com
Terms of Use, Classifieds Disclaimer, Privacy Policy, and Cookie Policy