Paul,

 

I changed the subject line since my vibrations were not from the oil pan. 

 

Vibration #1 was contact of the left front valve cover with the cowling.  The fix was reducing the height of the valve cover and removing the inner skin and core from the cowl as indicated in the photos.  I verified rocker arm/cover clearance before and after the “fix”.  And nope, the stock Continental cover would not have solved the clearance problem.

 

Vibration #2 was much more interesting.  At about 25 hours, I was over the Cascade Mountains near Redmond when the control stick started vibrating.  At first I thought the engine had gone on Auto-rough due to mountain/night/big water affecting my imagination.  I let go of the stick, still vibrating , so I did not change anything thinking it could be the engine coming apart.  Within easy glide of Redmond I reduced power and it slowly went away.  Fortunately, I had Mark Mahnke available to help trouble shoot.  He suspected the nose gear doors and he was right.  They were just a little too low and when the angle of attack was high enough it would shake.  Leighton Mangels and John Halle have another fix for this by glassing up a little ramp forward of the leading edge of the doors.

 

How many hours were on your isolation mounts when they were “compressed, tilted and cracked“?

 

Steve Colwell  Legacy

 

From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of paul miller
Sent: Thursday, April 09, 2009 6:53 AM
To: lml@lancaironline.net
Subject: [LML] Re: Oil Pan Concerns

 

Steve: I just replaced the isolation mounts on my Legacy RG as they were compressed, tilted and cracked.   The quick drain was also interfering with the nose gear and I suspected that was the reason for some vibration problems I've been having.  I still am getting a good shake after dealing with those issues and have balanced the prop with little effect.   I just read your note on the oil pan and I have to go check.  Did you experience any vibration symptoms or did you just notice the interference or lack of clearance.   I know the io-550 moves forward and left and down a considerable amount in flight from the torque and pull.  The front left isolation mount gets the worst treatment so I think I've got some clearance issues that aren't visible on the ground.  Interested in experience of others.

 

Paul Miller

N357V

Spruce Creek FL

 

 

 

Here are the photos that I want to share with you.

I sent these photos using Adobe(R) Photoshop(R) Elements 5.0. Find out more: http://www.adobe.com/photoshopelementswin

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