|
|
Should have read your post more carefully Dave, could have figured out that
you meant the FW bolts.
BTW, a couple of builders have wrung off the AN4 nuts on the RD-1 drive
after reading the torque spec in inch-pounds. Many torque wrenches
read out in ft-pounds. You can probably guess the rest of the
story.
Tracy
----- Original Message -----
Sent: Friday, February 04, 2005 10:24
AM
Subject: [FlyRotary] Re: CCI sandwich
mounts.. torque values..
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/
>>>>
Archive: http://lancaironline.net/lists/flyrotary/List.html
>>>
>
>
>
>
>>>
Homepage: http://www.flyrotary.com/
>>>
Archive: http://lancaironline.net/lists/flyrotary/List.html
>>
>
>>
Homepage: http://www.flyrotary.com/
>>
Archive: http://lancaironline.net/lists/flyrotary/List.html
|
|