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02-02-2017, 11:47 AM
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Join Date: Sep 2006
Location: Trento, northern Italy
Posts: 621
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wheel bolts over torqued
Today I was changing a tire for a friend. His RV-8 was built three years ago and sports about 80 hrs.
The builder, my friend -during the building - was helped by the 'expert' in the wheels and brakes during the wheels assembly, not an airplane mechanic 
That guy never use the torque wrench, it's for bubba he says. 
It was really difficult (I really didn't understand why) removing the three bolts that keep the inner and outer half of the wheel. This is what I found:
- all bolts thread destroied
- two bolts bended 
I can't imagine how much power the expert ironman put in.
Build safe, everything has its own reason.
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02-02-2017, 12:05 PM
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Join Date: Jan 2005
Location: Shorewood, WI (Milwaukee area)
Posts: 1,066
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torque
Wow! You northern Italians are strong... And take good photos of the Dolomites!
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Bill Dicus
Shorewood (Milwaukee) Wisconsin
RV-8 N9669D Flying 12/4/14!
Flying Pitts S-2A, Piper Lance
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02-02-2017, 12:34 PM
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Join Date: Oct 2007
Location: Sacramento, CA
Posts: 3,344
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Just curious how over torqueing can cause the bolt to bend. It looks like the two halves have rotated some how or else.
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Mehrdad
N825SM RV7A - IO360M1B - SOLD
N825MS RV14A - IO390 - Flying
Dues paid
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02-02-2017, 12:50 PM
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Join Date: Dec 2005
Location: Mahomet, Illinois
Posts: 2,195
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The torque wrench is our friend. 
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Terry Ruprecht
RV-9A Tip-up; IO-320 D2A
S. James cowl/plenum
(Dues paid thru Nov '18)
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02-02-2017, 02:14 PM
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Join Date: Aug 2016
Location: Asheville, NC
Posts: 2,092
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bold bending?
I agree with Bavafa: You can't make a bolt bend like that by over-torquing - there has to be some kind of a side load. I'm also suspicious that the damaged threads were caused by over-torquing as well. The really bad threads on that last bolt almost look like someone tried to screw a coarse-thread nut onto an AN bolt.
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(2020 dues paid)
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02-02-2017, 05:50 PM
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Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 2,789
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weird. it took a significant load to bend that bolt.
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Steve Melton
Cincinnati, OH
RV-9A, Tip-up, Superior O-320, roller lifters, 160HP, WW 200RV, dual impulse slick mags, oil pressure = 65 psi, EGT = 1300F, flight hours = 800+ for all
Simplicity is the art in design.
My Artwork is freely given and published and cannot be patented.
www.rvplasticparts.com
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02-03-2017, 07:36 PM
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Join Date: Sep 2013
Location: Fort Smith, AR
Posts: 50
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Air Pressure
If you have a compete brain failure and remove one bolt before removing the air pressure from the tube, it will bend the two remaining bolts.
Don't bother asking me how I know...
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Patric "Balls" Coggin
RV-4: Purchased Flying
2019 Dues Paid Up
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02-03-2017, 07:57 PM
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Join Date: Apr 2011
Location: SF East Bay
Posts: 852
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Quote:
Originally Posted by Hawg Driver
If you have a compete brain failure and remove one bolt before removing the air pressure from the tube, it will bend the two remaining bolts.
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That was kind of my first thought when I saw the pictures.
Because I have never done that before, and I will never do it again.
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Sam
RV-8 with the Showplanes Fastback conversion
Emp completed except for glass work
Wings completed except for bottom skin and glass work
Fuselage underway
N18451 reserved
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02-03-2017, 09:22 PM
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Join Date: Jul 2013
Location: US
Posts: 2,246
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Quote:
Originally Posted by Hawg Driver
If you have a compete brain failure and remove one bolt before removing the air pressure from the tube, it will bend the two remaining bolts.
Don't bother asking me how I know...
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That sounds like a potentially lethal accident waiting to happen |
02-04-2017, 12:51 AM
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Join Date: Sep 2006
Location: Trento, northern Italy
Posts: 621
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Quote:
Originally Posted by Hawg Driver
If you have a compete brain failure and remove one bolt before removing the air pressure from the tube, it will bend the two remaining bolts.
Don't bother asking me how I know...
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Good to know but this wasn't our case. The core valve had been already removed and the tire separated from the halves.
BUT with further investigation, despite the destroyed bolts thread comes probably by on over torqued, the recent story of a ground loop of the airplane open my eyes.
I didn't notice twisting in the halves but IMHO the case is closed.
The winner are "Bavafa" and "Snopercod". |
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