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flying-nut(at)cfl.rr.com
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 Posted: Sat Feb 25, 2017 12:54 pm Post subject: fuel servo mounting |
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I try and learn from 'oh crap' issues my friends have had. Today, my
RV-9 buddy had one. He probably has < 30 hours in phase 1 and went
flying this morning. About a 60 mile round trip and on the way home,
subtle engine surges followed by rough running and fuel smell. Dead
sticked into home base, and put the plane away. Cowl removed. Failure
easy to diagnose. Two nuts that should be holding the fuel servo
tightly to the engine were laying in the lower cowl, and the other two
were loose. Real loose. No torque seal in evidence, so the nuts may
not have been torqued down to start with.
So, I looked at my install (not flying yet and untorqued) and, like his,
I have nuts holding the servo on, but no locking nuts, lock washers or
safety wire. This begs the question ..... what have others done when
attaching the fuel servo??
I've already had my 3 'oh craps' and don't want to risk another!!!!
Linn
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kdb.rv10(at)gmail.com
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| Posted: Sat Feb 25, 2017 1:03 pm Post subject: fuel servo mounting |
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I use loctite and 2 nuts on each stud.
On Sat, Feb 25, 2017 at 2:52 PM, Linn Walters <flying-nut(at)cfl.rr.com (flying-nut(at)cfl.rr.com)> wrote:
| Quote: | --> RV10-List message posted by: Linn Walters <flying-nut(at)cfl.rr.com (flying-nut(at)cfl.rr.com)>
I try and learn from 'oh crap' issues my friends have had. Today, my RV-9 buddy had one. He probably has < 30 hours in phase 1 and went flying this morning. About a 60 mile round trip and on the way home, subtle engine surges followed by rough running and fuel smell. Dead sticked into home base, and put the plane away. Cowl removed. Failure easy to diagnose. Two nuts that should be holding the fuel servo tightly to the engine were laying in the lower cowl, and the other two were loose. Real loose. No torque seal in evidence, so the nuts may not have been torqued down to start with.
So, I looked at my install (not flying yet and untorqued) and, like his, I have nuts holding the servo on, but no locking nuts, lock washers or safety wire. This begs the question ..... what have others done when attaching the fuel servo??
I've already had my 3 'oh craps' and don't want to risk another!!!!
Linn
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Lenny Iszak
Joined: 23 Mar 2008
Posts: 270
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| Posted: Sat Feb 25, 2017 2:12 pm Post subject: Re: fuel servo mounting |
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Hey Linn,
I used a flat washer and a star washer with blue Loctite. So far in 275 hours they haven't moved.
Nordlock washers might work great here. I first saw these on my Matco brakes, then someone posted this impressive video:
http://www.nord-lock.com/bolted/watch-the-new-junker-test-video-here/
Don't forget to safety wire the bolts holding the FAB mounting plate to the fuel servo.
Glad your buddy is ok.
Lenny
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flying-nut(at)cfl.rr.com
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| Posted: Sat Feb 25, 2017 2:43 pm Post subject: fuel servo mounting |
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Thanks Lenny ..... I had forgotten about the Nordlock washers!!!
On 2/25/2017 5:12 PM, Lenny Iszak wrote:
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jrlark
Joined: 03 Jul 2009
Posts: 72
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