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I have two broken exhaust springs and all I’ve done is ground run the engine for a few hours. I safety wired the springs which are carbon steel. I didn’t apply silicone. What am I doing wrong?

  • Re: Broken Exhaust Springs?

    by » 6 months ago


    I run three beads of hi-temp silicone down the outside of each spring -- no spring breakage so far in 900+ hours.  The safety wire is really only there to keep broken spring pieces from going through the pusher prop or somebody's head.

     


  • Re: Broken Exhaust Springs?

    by » 6 months ago


    The silicon on the springs helps keep the springs from vibrating themselves to death.

    Did they break in the hook ends or mid-Coil?

    Are they still looking shiney and new or badly corroded?


    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Bill.Hertzel@Yahoo.com
    Clicking the "Thank You" is Always Appreciated.


  • Re: Broken Exhaust Springs?

    by » 6 months ago


    Broken at the ends, light surface rust. I think my home made installation tool may have nicked the spring end during installation because I can see a microscopic fatigue crack signature on the broken bit.

     

    I bought some stainless springs from Rotax, so I’ll fit them with a new tool and apply silicon as well as safety wire.


  • Re: Broken Exhaust Springs?

    by » 6 months ago


    The Vans MM also recommends pulling the springs with a safety wire loop so as not to scratch springs ends.

    26485_2_muffler springs.jpg (You do not have access to download this file.)

  • Re: Broken Exhaust Springs?

    by » 6 months ago


    You can always pull the Springs with an actual SPRING PULLER.  Imagine that!

    They actually make a tool for Pulling springs and it is under $10.  Under $5 if you look.

    And easy enough to make with an old fashioned Coat-Hanger, Which might be even harder to find. wink


    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Bill.Hertzel@Yahoo.com
    Clicking the "Thank You" is Always Appreciated.


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