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How to tell if your valve seals are bad

Discussion in 'Engine Building' started by cheese9988, Jan 26, 2007.

  1. cheese9988

    cheese9988 Senior Member VIP

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    How can you tell if your valve seals are bad, I have the head out of the car?
     
  2. 97hatch

    97hatch ?

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    they leakwhen they are bad........ if you are in question replace them
     
  3. TurboMirage

    TurboMirage YEEAAAHHH VIP

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  4. Exodus

    Exodus Junior Member

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    Those seals scrape oil from the valve stem off to stop it from entering the combustion chamber to be burnt off. Often times, when valve seals go bad, people often wind up replacing a slew of things and never truly fix the problem because as a part it's overlooked more frequently than something like the head-gasket would be when the exhaust is giving off different colors and you smell oil.

    If you have a solid enough engine and you aren't worried about any of the major and more common seals having become deteriorated and the valve seals are basically the only maintenance in the top end you haven't done seal-wise, then go ahead and do it, it'll only help your engine.

    As far as trying to test your current seals, I suppose if you could compress any given valve and watch if oil is running down the valve stem you would be able to tell the good ones from bad, but other than that idea, I think since you have the head off you should go ahead and do a top end gasket set, which includes valve seals. Use Copper Spray on the gaskets, torque to spec, maybe get some ARP head studs if you don't have them yet and you'll be set to go, mang.
     
  5. cheese9988

    cheese9988 Senior Member VIP

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    Thanks! I have taken out valves before, and have had a heck of a time trying to get the retainers (I think thier called) back in. I have tried different spring compressors, mainly from Sears, and non seem to be the correct size, can anyone recommend one?
     
  6. MikeBergy

    MikeBergy Blah blah blah....

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  7. hcivic.com

    hcivic.com Senior Member

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    for the 5 bucks in parts do it.
     
  8. MikeBergy

    MikeBergy Blah blah blah....

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    since when does a set of OEM valves seals cost $5? It's more like 30. :)
     
  9. 97hatch

    97hatch ?

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    he probaly means some aftermarket oe replacement
     
  10. cheese9988

    cheese9988 Senior Member VIP

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    Is there a huge difference between the aftermarket and oem valve seals?
     
  11. cheese9988

    cheese9988 Senior Member VIP

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    Ouch, you can always trust snap-on for two things, to work well and be expensive.
     
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