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rough running engine

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valleyauto(at)clearwire.n
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Posted: Tue Jan 02, 2007 9:43 pm Post subject: rough running engine

Hi everyone, I am new to this yak list, but I have  been flying and maintaining my Yak for the past two years. For the past several  months I have experienced an intermittent "rough running" engine. At first I  thought it could be carb-ice, but nope... Then, I thought maybe it could be the  spark plug wires, new plug wires answered that question... nope. I still had a  rough running engine. It seemed it was more prone to the problem in colder air  temperatures (40F). It would happen intermittently, occasionally it has happened  on climb out, but it would also happened at cruise and even on the ground, at  all throttle settings. Generally when it happened at cruise speed, you could  feel it start to come on, it would start with a slight vibration and then a  violent vibration that would shake the instrument panel, sometimes with a  backfire, and then smooth out and run ok until next time. The duration of the  rough running was usually less than 5 seconds, not really long enough time to  trouble shoot it.... Finely, the other day it did it four times. I was able to  do a mag check this time and it had no change. When the cyl temp would cool to  160 or so it would mis-fire. If you keep it at 190 it was better, but it would  still happen. So, if you let the CHT cool down to 160, you could count on the  chance of "chili" in your shorts if you weren’t ready for it... Then, I replaced  the intake gland seals... and no more misfire!!! I have been out several times  since replacing the Gland Seals, trying to make it mis-fire (allowing the CHT  down to 160) and it seems the problem has been fixed!! . The gland nuts were  tight but they would not seal, when they got warm they would seal. It runs  smoother has better idle . Turns out to be the single cheapest thing with the  best improvement I have done to my yak  

Don Milbourn 

  

  

  



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fstarace(at)sc.rr.com
Guest

Posted: Tue Jan 02, 2007 9:58 pm Post subject: rough running engine

Contact Michael Carr! mikeacarr at yahoo.com...he has perfected his  engine/motor and you'd be impressed! Happy flying to y'all! He's a smart man  with alot of experience due to his investigativeness!

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dsavarese(at)elmore.rr.co
Guest

Posted: Wed Jan 03, 2007 4:58 am Post subject: rough running engine

Good post Don.  What condition did you find the intake  gland nut rubber seals?

 Dennis

  

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valleyauto(at)clearwire.n
Guest

Posted: Wed Jan 03, 2007 7:54 am Post subject: rough running engine

Dennis, they looked old and dry. -----  Original Message ----- 

 [quote]   From:    A.    Dennis Savarese (dsavarese(at)elmore.rr.com) 

   To: yak-list(at)matronics.com (yak-list(at)matronics.com) 

   Sent: Wednesday, January 03, 2007 5:57    AM

   Subject: Re: rough running    engine

   Good post Don.  What condition did you find the intake    gland nut rubber seals?

   Dennis

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dsavarese(at)elmore.rr.co
Guest

Posted: Wed Jan 03, 2007 8:05 am Post subject: rough running engine

I know this question is after the fact, but when you felt the  vibration did you happen to see any change in the manifold  pressure?

 Dennis

  

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