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Message-ID: <4202A253.4010600@earthlink.net>
Date: Thu, 03 Feb 2005 16:14:43 -0600
From: David Staten <Dastaten@earthlink.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: CCI sandwich mounts.. torque values..
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The oil pan "sandwich" mounts  for the rotary take 3/8" bolts.. Chris 
and I had it temporarily mounted using hardware store parts, but we 
elected to use AN bolts to fit it up for the final/working attachment. 
3/8 translates to AN6... and we are looking at about AN6-37 for the 
bottom and AN6-34 for the top mounting holes (this takes into account 
the plywood aft bulkhead and stainless overlay/firewall, with some 
fender washers to distribute the force.
 
I don't have the CCI paperwork handy.. is there a recommended fastener 
and torque value for use with those mounts?
 
What is an appropriate torque value with AN6 bolts/nuts? I have one 
reference on hand and want to compare notes. I have the "aviation 
mechanic handbook" 4th ed by Dale Crane that lists two different torque 
values: one is "nuts tension torque limits" and is 160-190 INCH pounds, 
but it also lists a "nut shear torque limit" as well of 95-110 INCH pounds.
 
Rather than make a guess here, would someone with the knowledge spell 
out for me the difference between those two categories?
 
Dave Staten