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recapen(at)earthlink.net
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 Posted: Thu Apr 24, 2008 4:36 am Post subject: Wiggly Cotter pins |
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One of my four engine mount bolt cotter pins wiggles a bit - it is set like the other three.
I've re-done it a bunch of times - so either it is technique for this particular bolt...or there's something wrong with the setup. I'm using the same size pin for all four bolts. I'm really thinking it is my technique.
According to the 43.13 the head should fit snug - which I take to mean that they shouldn't wiggle. Conceptually, I think the wiggling could lead to friction erosion of the pin - with a potential for failure.
Maybe, I need to do this one using the other method for setting them - I've been trying to bend one leg over the top and the other down - I may try the 'anchor' method as shown in the 43.13.
Somebody tell me that I'm not out of my mind with my anal-retentiveness.....
Ralph Capen
RV6AQB Slider N822AR (at) N06
Knocking out the million little things.....
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wdleonard(at)gmail.com
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recapen(at)earthlink.net
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| Posted: Thu Apr 24, 2008 6:42 am Post subject: Wiggly Cotter pins |
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Thanks David.......I'll start the twelve-step program right after I get flying.......
--
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chaskuss(at)yahoo.com
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| Posted: Thu Apr 24, 2008 6:58 am Post subject: Wiggly Cotter pins |
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Ralph,
I concur with Carey's suggestion to secure the cotter pin with RTV. The most likely cause of the loose fit of the pin will be the security hole drilled into that one bolt. It is probably larger than the other 3 bolts.
Charlie Kuss
--- On Thu, 4/24/08, Ralph E. Capen <recapen(at)earthlink.net> wrote:
| Quote: | From: Ralph E. Capen <recapen(at)earthlink.net>
Subject: Wiggly Cotter pins
To: "rv-list" <rv-list(at)matronics.com>, "lycoming engine list" <lycomingengines-list(at)matronics.com>
Date: Thursday, April 24, 2008, 8:33 AM
<recapen(at)earthlink.net>
One of my four engine mount bolt cotter pins wiggles a bit
- it is set like the other three.
I've re-done it a bunch of times - so either it is
technique for this particular bolt...or there's
something wrong with the setup. I'm using the same
size pin for all four bolts. I'm really thinking it is
my technique.
According to the 43.13 the head should fit snug - which I
take to mean that they shouldn't wiggle. Conceptually,
I think the wiggling could lead to friction erosion of the
pin - with a potential for failure.
Maybe, I need to do this one using the other method for
setting them - I've been trying to bend one leg over
the top and the other down - I may try the 'anchor'
method as shown in the 43.13.
Somebody tell me that I'm not out of my mind with my
anal-retentiveness.....
Ralph Capen
RV6AQB Slider N822AR (at) N06
Knocking out the million little things.....
|
Be a better friend, newshound, and
know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ
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jim jewell
Joined: 09 Jan 2006
Posts: 82
Location: Kelowna B.C. Canada
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Vinnfizz(at)aol.com
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| Posted: Thu Apr 24, 2008 10:12 am Post subject: Wiggly Cotter pins |
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Some say that is anal attentiveness! Makes for a safe and beautiful airplane!
Ed
Need a new ride? Check out the largest site for U.S. used car listings at AOL Autos.
[quote][b]
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AV8ORJWC
Joined: 13 Jul 2006
Posts: 1149
Location: Aurora, Oregon "Home of VANS"
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| Posted: Fri Apr 25, 2008 7:43 am Post subject: Wiggly Cotter pins |
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I find wiggly cotter pins a lot doing EAA Tech Inspections. There is no standard on experimentals, the owner/builder sets the standard. The AC43-13 wants them tight. The airliners you fly on are all tight. The airline Quality Control Inspector will fail any that are wiggly. We do that by pulling the head down into the fastener, bending the legs against the object and often smacking them with the handle of our pliers. QC always looks for wigglies, correct leg length of cotter pins, correct hardware lash up and often on critical items like engine mounts and landing gear confirm NO Wigglies by using torque seal paint.
I always point out the wiggly ones on engine mounts.
Guess I must be an AR Tech.
John Cox
From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of David Leonard
Sent: Thursday, April 24, 2008 7:20 AM
To: rv-list(at)matronics.com
Subject: Re: Wiggly Cotter pins
| Quote: |
Somebody tell me that I'm not out of my mind with my anal-retentiveness.....
Ralph Capen
RV6AQB Slider N822AR (at) N06
Knocking out the million little things.....
|
Unfortunately Ralph, I think you are out or your mind with A.R. Sorry. They have rehab you know. 
--
David Leonard
Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster.net
http://RotaryRoster.net [quote] [/b][/b][/b][/b]http://www.matronics.com/Navigator?RV-List[/b]http://forums.matronics.com[/b]http://www.matronics.com/contribution [b]
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recapen(at)earthlink.net
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| Posted: Mon Apr 28, 2008 4:51 am Post subject: Wiggly Cotter pins |
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My wiggly one is on the lower left engine mount - so, like you, this one is important to me.
--
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