Mailing List lml@lancaironline.net Message #3738
From: <RWolf99@aol.com>
Subject: Engine Mount Fit to Firewall (LNC2)
Date: Sat, 30 Oct 1999 13:01:05 EDT
To: <lancair.list@olsusa.com>
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In a message dated 10/29/99 9:41:30 PM, you wrote:

<<The firewall of my kit
wasn't totally flat so I bad to make it be flat.  It was approved by
Lancair. In my case there was really big gaps between mount and firewall,
up to quarter inch. >>

I had this same problem to a lesser degree, but I thought it was the engine
mount that was out-of-plane rather than a warped firewall.  Two of my engine
mount pads would not lay flat on the firewall.  Neither would they lay flat
when on a tabletop, which is why I say the problem is with the engine mount
rather than the firewall.  However, the gap was coincidentally almost exactly
the thickness of an AN970 area washer.  Place an area washer between the
offending pads and the firewall and, voila, the problem is solved.  When I
installed the fiberfrax, I glued the washers to the
fiberglass-covered-plywood firewall with red RTV.  

This means that two engine mount pads have an extra area washer, since the
permanent installation of the engine mount already includes trimming away the
fiberfrax under the engine mount pad and placing an area washer there. (or
was it two?  I forgot.  The manual was very clear here and I did what it
said.)

- Rob Wolf
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