25D DOHC Valve Lash

Discussion in 'Modifications And Maintenance' started by Threshld1, Apr 5, 2009.

  1. Threshld1
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    Threshld1 Well-Known Member

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    Anyone have the valve lash spec of a 97 phase 1 DOHC - shimmed buckets? My book only covers to 96 w/ HLA's.
     
  2. phi11
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    phi11 Well-Known Member

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    Valve lash adjuster. ('97 2.5 DOHC)

    OD: 29.959 - 29.975 mm
     
  3. Threshld1
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    Threshld1 Well-Known Member

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    How about lash between shim and cam w/ loeb (heh) 180* from face
     
  4. phi11
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    phi11 Well-Known Member

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    Valve Lifter?
    OD: 32.959 - 32.975 mm
     
  5. Threshld1
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    Threshld1 Well-Known Member

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    *Face-Palm* haha so close, clearance between bucket and cam with valve fully uncompressed - Valve lash. Should be in the .00XX" range
     
  6. phi11
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    phi11 Well-Known Member

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    G2M0767
    3) Measure inner diameter of bush on cylinder head.
    Inner diameter:
    29.994 — 30.016 mm (1.1809 — 1.1817 in)
    CAUTION:
    If difference between outer diameter of valve lash
    adjuster and inner diameter of bush is over the limit,
    replace cylinder head.
    Standard:
    0.019 — 0.057 mm (0.0007 — 0.0022 in)
    Limit:
    0.100 mm (0.0039 in)

    or

    G2M0767
    3) Measure inner diameter of valve lifter mating part on
    cylinder head.
    Inner diameter:
    32.994 — 33.016 mm (1.2990 — 1.2998 in)
    CAUTION:
    If difference between outer diameter of valve lifter and
    inner diameter of valve lifter mating part is over the
    limit, replace cylinder head.
    Standard:
    0.019 — 0.057 mm (0.0007 — 0.0022 in)
    Limit:
    0.100 mm (0.0039 in)
    ?
     
  7. subytek
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    subytek Well-Known Member

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    Does this help?
    .008" +/- .001" intake
    .010" +/- .001" exhaust
     
  8. Threshld1
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    Threshld1 Well-Known Member

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    Perfect thank you both!!
     
  9. Threshld1
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    Threshld1 Well-Known Member

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    Beautiful, all of them are <.0005" above spec within tolerance.