LC20 Engine Mount Blues

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From: <RWolf99 [at] aol.com>
Subject: LC20 Engine Mount Blues
Date: Thu, 31 Dec 1998 10:55:26 EST
To: <lancair.list [at] olsusa.com>

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I have just received my long engine mount.  While it looks like a nice piece

of hardware, there are significant problems with it.



My original (short) mount had "bolt tubes" (the tubes through which the bolts

attaching to the firewall go) which protruded up to 1/4 inch forward of the

weld forming the junction of the engine mount tubes.  The end result was that

the washers and the bolt heads fit square to the "bolt tubes".  There was no

intereference and it was a nice piece of work.



This mount has "bolt tubes" which stand off insufficiently from the weld

junction.  Several of the bolts cannot be inserted without the washer

interfering with the weld bead, and in one case the washer interferes with the

engine mount tube itself!  I can see grinding off weld bead material to make

clearance, but not the engine mount tube itself.



Two solutions emerge:



1)  Call Vern and ask for a replacement part that works



2)  Install a spacer tube, made from the "bolt tube" material to space the

washer and bolt head farther from the interference.  This would basically be a

steel tube maybe 1/8 inch long that is an extension of the "bolt tube"





What do y'all think?



- Rob Wolf

rwolf99 [at] aol.com



[You probably would be ok using a small piece of that 5/8x7/16 tube as

a spacer to get the bolt head further from the weldment (let me know if

you want some, I think I've got a bit left from my new mount).  Another

option would be to mill away a bit of the washer so it fits around the

offending weld.  I don't think it would be a good idea to grind away any

of the weld bead, as you'd likely create a little stress riser there,

and who needs that kind of aggravation.



    <Marv>]

LC20 Engine Mount Blues

From: <CHRISTOPHER_ZAVATSON [at] udlp.com>
Subject: LC20 Engine Mount Blues
Date: Mon, 4 Jan 1999 20:26:16 -0600
To: <Lancair.list [at] olsusa.com>

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     Rob,

     

     There is no need for a spacer or washer in this installation.  Let the

     bearing surface of the bolt rest against the tube as is.  Just

     remember, when torquing the bolt, turn the nut and not the bolt.

     

     Chris Zavatson

     N91CZ