Thread lock as thread sealant?

Discussion in 'Off Topic' started by uss2defiant, Nov 16, 2018.

  1. uss2defiant

    uss2defiant Full Access Member

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    I have a Mazda 5.
    There's a blind engine cover plug on the head that still has a slow oil leak. I used permatex high temp thread sealant when I tried sealing it the last time.

    Can I use blue 243 loctite as a thread sealant?
    The packaging says it'll prevent leaks.
    I wonder if the vibration cause it to come undone and cause it to leak.

    The threads is standard and is not a pipe thread.

    It has a copper crush washer which I've replaced too. 10ftlb is what is specified in the FSM.

    Couldn't find a conclusive answer googling around.
    Thank you.
     
  2. ltd02

    ltd02 Well-Known Member KJ Supporting Member

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    Not saying that it's right but I've used it for that. Seems like the washer should be doing the actual sealing.
     
  3. uss2defiant

    uss2defiant Full Access Member

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    Yeah. I would think so too but a new one didn't work so I'll have to redo it but I am thinking of trying blue thread locker to see if it holds better.
     
  4. HoosierJeeper

    HoosierJeeper Gold Supporter/Admin Staff Member Administrator

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    What about some plumbers tape on the threads? (The cheap white stuff!)
    Edit: teflon tape...name escaped me
     
    Last edited: Nov 19, 2018
  5. uss2defiant

    uss2defiant Full Access Member

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    i think those would melt with the high temperature and I think those would work best with tapered threads.

    The thread lock seems to be holding up so far....
    fingers crossed