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Torque Spec's B18 Manifold nuts

uid 35621's pic
posted by  Suppo176 on  Mon Oct 27 22:45 CST 2014
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last visit: Mon Jan 13 13:39 CST 2014
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After pouring over the Green Books, the old and yellowed Chilton Bible and some instructions from Phil Singher on rebuilding B18's, I am still in the dark about what is the CORRECT torque spec for the nuts holding the exhaust and intake manifolds on the shared Gasket.

Any help on finding out what the engineers stated was correct for a 1965 B18D would be greatly appreciated!







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    Torque Spec's B18 Manifold nuts

    uid 5322's pic
    posted by  alschnertz on  Tue Oct 28 10:14 CST 2014
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    last visit: Fri Oct 24 10:32 CST 2014
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    For some reason, 17 ft-lbs. comes to mind.
    --
    "Differences of opinions should be tolerated, but not if they're too different' - Sharon Craig








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    Torque Spec's B18 Manifold nuts

    posted by  planetman on  Tue Oct 28 09:20 CST 2014
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    last visit: Fri Oct 24 09:29 CST 2014
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    You are right, there are no printed torque specs for the manifold bolts.

    The studs are 5/16" and most torque specs for a 5/16" bolt 20-25 ftlbs.

    I have always hand tightened them and on some of the manifolds, you can't get
    a torque wrench on some of the nuts anyway.

    FYI, it is critical to the life of the the manifold gasket and the exhaust flange gasket that you go back and retighten the nuts after a couple of weeks of driving.

    Both gaskets are made of material that can be compressed further after it has been repeatedly heated so you need to retighten.

    If you don't retighten, the gasket will fail by blowing out some of the compressible material and creating a leak.
    --
    Eric
    Hi Performance Automotive Service (formerly OVO or Old Volvos Only)
    Torrance, CA 90502
    hiperformanceautoservice.com or oldvolvosonly.com








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      Torque Spec's B18 Manifold nuts

      uid 35621's pic
      posted by  Suppo176 on  Wed Oct 29 21:59 CST 2014
      Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
      last visit: Mon Jan 13 13:39 CST 2014
      [RELATED]

      Thanks Erik! This information will be added IN INK to my service manual notes.

      Agree that at least two of the nuts cannot be accessed with a torque wrench with the carbs and heat shield in place. I will religiously follow the "retightening" regimen suggested and hopefully get more than 27,000 miles out of this one.

      Phil
      1965 PV544






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