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Thanks Fred.. and everyone who responded.
Sorry I was less than clear in my original post.. Thats what I get for posting while tired. I was indeed referring to the firewall mounting hardware with regards to the CCI mount.
I am now beginning to learn "all about AN and MS hardware" from the lady who owns the aircraft parts store. She visibly winced a few times when I described that I was helping build a (WINCE) homebuilt and we were putting an auto engine (WINCE) from Mazda (WINCE) on it..
All's well that ends well, though. she took some time to explain the AN nomenclature regarding the bolt specs so now I know what I am looking at/for. She also happens to have a BIG torque wrench thats good for 600 ft lbs that she will let me borrow to ensure that the "big nut" is torqued properly.. She winced a few more times when I described how I was unable to find a large enough torque wrench at reasonable cost, nor a torque multiplier, so I described the 5 ft pipe on the end of the 2 ft breaker bar that I applied an approx 60-70 lbs to on the end (after practicing some 50-60 lbs pushes..).
Seriously she's a nice lady, been in the aviation parts/maintenance business for 40 years and she just wants to ensure the job is done right, and safely.
Anyhooo... thats all for now,
Dave
CCI wrote:
Hi Dave, You want to use the tension-type nut torque values, that is for AN 310, 160-190 inch-pounds. Fred, CCI.
At 05:14 PM 2/3/2005, you wrote:
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
Homepage: http://www.flyrotary.com/
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Homepage: http://www.flyrotary.com/
Archive: http://lancaironline.net/lists/flyrotary/List.html
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