Torque specs in WSM: for dry or lightly oiled fasteners?

Discussion in 'Boxers/TR/M' started by Supernaut, Oct 1, 2021.

  1. Supernaut

    Supernaut Karting

    Dec 3, 2019
    Annapolis MD
    Full Name:
    John Panek
    Couldn't find this in my 1983 BBi WSM or searching forums here. Installing cylinder heads. Should I clean head studs and nuts and very lightly coat with motor oil before installing or assemble dry? I know it makes a big difference in clamping force. What is the consensus here?
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  3. pshoejberg

    pshoejberg Formula 3
    Silver Subscribed

    Dec 22, 2007
    Full Name:
    Peter H
    Light coat of oil.

    Best, Peter
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  4. vincenzo

    vincenzo F1 Rookie

    Nov 2, 2003
    I don’t recall seeing it stated in the WSM one way or the other. In most all engineering documents, torque is assumed as clean and dry unless specified differently. In fact, most owners manuals clearly state clean and dry when quoting lug nut torque for the average laymen.

    When galling is an issue, most eng docs spec out the recommended lubricant as well as the torque. Antiseize is a lubricant too!

    If you see it in the TR WSM, please point it out. It is a good question.

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  5. Qavion

    Qavion F1 Veteran
    Silver Subscribed

    Feb 20, 2015
    Full Name:
    Ian Riddell
    Would this be of concern for even routine oil changes? I torque my drain plugs to a specific value, but I don't bother removing oil from the threads. TIA.
  6. vincenzo

    vincenzo F1 Rookie

    Nov 2, 2003
    It is doubtful anybody cleans the oil off those threads. I use safety wire on those plugs and ‘barely’ hit the torque spec.
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