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Rotax 912 UL engine run on

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Catz631(at)aol.com
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Posted: Wed Apr 30, 2008 4:05 am Post subject: Rotax 912 UL engine run on

Yesterday at engine shutdown (after an uneventful flight) a weird thing happened. My 912UL kind of stopped then rotated 3 revolutions backwards. It sounded just like an old car with engine run on when you shut it down (ie; it had a knocking/pinging/ spitting sound) 

 The outside airtemp was about 70 degrees .The water and oil temps were normal.The indicated engine rpm was 1800- 2000 at shutdown. The only thing that I can think of that might have caused it was the fuel.It was car gas about two months old and 87 octane which I keep in a 30 gal bowser. The plane (Kitfox)had been down for two months for various mods on my aircraft.

  I called several people to ask if they had ever seen this happen ( Thanks John !) I also  called Lockwood and they recommend that I purge the oil system for possible induced air in the oil  system. The tech had never heard of this happening. I will purge the system and check the valve clerances, then "burp" the system. I have also bought some fresh high test auto fuel to try to see if that helps. 

    Has anybody ever had this happen? And if so any possible damage ? I have seen this on occasion with small Continentals but the Rotax is not suppose to do this.

                                       Thanks ! 

                         

                                                            Dick Maddux

                                                            Kitfox4-1200

                                                            Rotax912UL

                                                            Pensacola,Fl





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FlyboyTR

Joined: 04 Nov 2006
Posts: 215
Location: Mobile, Alabama

Posted: Fri May 02, 2008 4:15 pm Post subject: Re: Rotax 912 UL engine run on

Dick,

Also give Ronnie Smith a call at South Mississippi Light Aircraft (Lucedale, MS) and ask him about this event.  Please tell him I told you to call!



Travis

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_________________
Travis Rayner
Mobile, AL
Skystar Vixen, N-789DF
Continental IO-240, Prince P-Tip Prop
ADI-II Autopilot
AnyWhereMap Navigation with weather
www.enotam.net (My Flying Info Website)

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