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  • Re: 912 intake manifold carb synch bolt

    by » 4 years ago


    Sure, after you remove the clamp from the metal compensation tube rubber hose (I used the #2/#4 cylinder intake manifold side), remove the hex head bolt that that clamps the metal compensation tube to the fuel distribution assembly at the center of the engine. I also cut and removed the zip ties that bind the fuel lines to the metal compensation tube to allow a little more movement.  Now you can pry up and back on the rubber hose where it connects to the angular tube on the intake manifold and there’s just enough play in the metal compensation tube to allow the rubber hose to come off the angular manifold tube.  Then I connected my carbmate as per the carbmate instructions using the Rotax adapter kit, and after watching the video on this website.  I chose the #2/#4 side so I could route the carbmate hoses into the cockpit and start the engine and take my readings sitting in the pilot seat. Shut down, make adjustments, burp the Rotax, climb back in, start her up again, determine the effect your change made, shut down, climb out, repeat until complete.


    Thank you said by: Ken Ryan

  • Re: 912 intake manifold carb synch bolt

    by » 4 years ago


    FYI the purpose of burping the engine is to move all (or nearly all) of the oil that is in the bottom of the crankcase to the external oil tank, so that an accurate reading of oil level can be obtained. In the scenario you describe where you are shutting the engine down to make adjustments and then re-starting, there would be no need (or purpose) in repeatedly burping the engine. According to this thread:

    https://www.rotax-owner.com/en/general-tech-discussion/5245-how-long-between-starts-needs-prop-oil-burping?start=5

    another reason to burp is to make sure that oil has not leaked into and filled a cylinder, but that would not happen in the short time required to make your adjustments.


  • Re: 912 intake manifold carb synch bolt

    by » 4 years ago


    Thanks. I’ve got to make time to get to an operator and a line maintenance course either in Lucedale MS or at Lockwood.  


  • Re: 912 intake manifold carb synch bolt

    by » 4 years ago


    In my opinion, it's MUCH easier to remove those two M6 bolts and put some M6-threaded nipples in there than it is to pull mess with pulling apart and reassembling that compensating tube/hose setup.  The hardest part of the former (for those of us in the US) is just getting those metric air-hose nipples, but once you have them, you'll be all set.


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