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    Thread: Valve Guide Clearances -- Please help

    1. Member haenszel's Avatar
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      03-26-2007 03:32 PM #1
      I've pulled my AEB head apart and had it welded by a local machine shop. I'm bringing him my valves today to check the valve guide clearances to be sure Its within spec. -- Problem is.... I dont have the specs.
      Anyone have valve guide clearance specs? Thx.
      10.201@143.35mph - VR6T

    2. 03-26-2007 03:41 PM #2
      what are you welding on the head?

    3. Member haenszel's Avatar
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      03-26-2007 03:49 PM #3
      Blocking oil drains and modifying 3 others.
      10.201@143.35mph - VR6T

    4. 03-26-2007 05:14 PM #4
      yes of course...forgot you were using an ABA short block.
      I would give Bobqzzi a jingle if you continue to have problems finding this info -- its not in the Bentley?

    5. Member
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      03-26-2007 06:44 PM #5
      2 ways to do that.
      The factory manual has a procedure for measuring valve "rock" with the valve even with the top of the guide. The wear limit for the rock is .8mm for intake and exhaust. This is a perfectly fine method.

      Most machine shops will measure the OD of the valves and then measure the ID of the guides.
      Intake valves should be 5.95 - 5.97 mm
      Exhaust valves should be 5.94 - 5.95 mm
      Intake valve clearance should be .03-.05mm (.0012-.002")
      Exhaust valves clearance should be .05-.06mm (.002-.0024")
      So the hole should be 6mm on the button- although loose is WAY better than tight, especially on the exhaust side.
      I try not to replace guides if I can possibly help it; it is traumatic for the head to have them changed, and they are never quite as good as the originals. That said, if they are too big, then you need to change them.
      I have almost never seen a guide you could just drive in and have it be sized properly. I also suggest liquid nitrogen ins the best method to chill the guides, and a hotplate works well for heating the head to about 200 degrees.
      It is also best to get a guide with an 11.04mm OD- there are some floating around with an 11.07mm OD, which is too big. If using guides without shoulders, be sure to set the height correctly.
      Finally- when removing old guides only drive them towards the combustion chamber, and it is easiest if you core drill them first.
      I know this is way more than the OP asked, but I figured it would be good to get the info in one spot.
      Oh, and can anyone tell me the best BOV for the 1.8T?



      Modified by bobqzzi at 7:12 PM 3-26-2007
      Performance and replacement parts, engine building www.qedpower.com

      bobqzzi@cox.net

    6. 03-26-2007 07:44 PM #6
      Thanks Bob, added link to this from the FAQ.

    7. Member haenszel's Avatar
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      03-26-2007 08:33 PM #7
      Thanks Bob.
      I went to check out the guides today w/stock valves in hand at the shop. The exhausts are rathers loose, perhaps 1mm play(maybe less) which is too much for my liking. The intake's looked fine. I'm having just the exhausts replaced.
      He showed me a brand new guide and how the fitment was and it was much different feeling.
      10.201@143.35mph - VR6T

    8. Member
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      03-26-2007 11:15 PM #8
      Be sure to actually measure. They feel loose when they are right- they are always looser than the intakes.
      Performance and replacement parts, engine building www.qedpower.com

      bobqzzi@cox.net

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