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I have a new 912S on a Magni M-16 gyro. I have about 45 hours on the engine. I recently found a very, very small amount of seepage on the water inlet tube flange on the top of cylinder #1. Sometimes it is dry and not seeping. Looks like it is around the threads. Do I need to take this apart to reseal the threads or is it possible to tighten or reseal without unscrewing the tube from the flange? What is the torque for the two allen head screws holding the flange in place. What is the torque for the allen bolts holding the intake in place. i have researched my manuals and cannot find the values. Is Loctite 648 the best to use for this?
  • Re: Water inlet tube leaking

    by » 6 years ago


    The torques are now in the Heavy Maint. manual.
    That tube bolt torque is 90 in/lbs. Make sure the "O" ring is in place before you put the tube back in place.
    Drain down the system coolant from the bottom of the radiator. Then you will need to take that tube off. Before you unscrew the tube mark the flange base and tube bottom with a magic marker so when you put it back together you can get it clocked where you want it. Take a heat gun and heat the base of the tube and flange. Once the Loctite softens the tube will just unscrew. DO NOT force it or you may be buying a new tube if you bend it. Once it's apart clean the threads and then apply some Loctite 648 (green) to the threads all the way around and screw the tube back into the flange. I would go ahead and let it sit overnight. That's my personal preference before I put coolant back in. The Loctite will cure faster. I just hate to mess up a good job. :)
    It's really quite easy to do this job.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell


  • Re: Water inlet tube leaking

    by » 6 years ago


    Roger: Thank you for responding. I will need to remove the intake also to get access to the inlet tube flange. Are the torque value for the intake bolts also 90 in/lbs?

  • Re: Water inlet tube leaking

    by » 6 years ago


    Hi Robert,
    yes, 90 in/lbs. Make sure the "O" rings are in place when you put it back together.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell


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