new 3B head gaskets are MLS?! uh oh?

Discussion in 'Diesel Tech / 24 volts' started by amaurer, Feb 20, 2009.

  1. amaurer

    amaurer

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    I just got my new head gasket and its MLS (multilayer steel) as opposed to the original which was composite-with-armor-rings.

    I've heard that MLS gaskets are better, but that they require better flatness and surface roughness specs. While I did have the head resurfaced, I have no way of knowing what roughness the shop achieved and I have no realistic way to resurface the block or check its flatness.

    The new gasket is OEM toyota, 58110:
    IH8MUD Forums - View Single Post - 13B-T head gasket is same as 3B

    Am I in for trouble, or should I shut up and trust Toyota? Are all my torque specs and such the same when I'm using the new type of gasket?
     
  2. Gold Boy

    Gold Boy

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    when i had my 13bt HG replaced with the HG i ordered from 4wheelauto, the mechanic who did the install remarked that he had noticed that the replacement HG was of heavier and of stronger construction, than the cracked HG.
     
  3. amaurer

    amaurer

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    yeah, the MLS gasket is quite a bit heavier and stiffer than the old one.
     
  4. RufusTheDufus

    RufusTheDufus DieselUpdate.com SILVER Star

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    I wonder if the MLS gasket compresses less/more than the older style when torqued properly? Just thinking about changes in compression ratio. A .015" thicker gasket might lower the compression ratio a bit.
     
  5. RufusTheDufus

    RufusTheDufus DieselUpdate.com SILVER Star

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    Drew, do you have a photo of your MLS gasket? I'm curious what the area under the pre-cup looked like?
     
  6. RufusTheDufus

    RufusTheDufus DieselUpdate.com SILVER Star

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    I found the other thread. Thanks for the photos.
     
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