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Old 12-30-2015, 01:54 PM
Michael Burbidge Michael Burbidge is offline
Join Date: May 2006
Location: Sammamish, WA
Posts: 697
Default I win the dumbest all time mistake...

I was removing the long studs to install my p-mag. I used the double not method which worked well, until I dropped one of the nuts into the accessory case. Talk about taking the wind out of my sails.

Any suggestions for retrieving the nut? I suspect it is in the oil sump.

Michael Burbidge
Sammamish, WA
RV-14A Wings
RV-9A Flying 390 hours!
Last Donation: December 2020
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Old 12-30-2015, 02:03 PM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is offline
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 3,250

Quality magnet on a flexible rod - and go fishing. Make sure the magnet is securely attached to the rod so you don't end up with another piece in the case.

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Old 12-30-2015, 02:12 PM
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jetjok jetjok is offline
Join Date: Feb 2007
Location: Sutter Creek, CA
Posts: 842

Originally Posted by Michael Burbidge View Post
I was removing the long studs to install my p-mag. I used the double not method which worked well, until I dropped one of the nuts into the accessory case. Talk about taking the wind out of my sails.

Any suggestions for retrieving the nut? I suspect it is in the oil sump.

Oh, I am sure that you are the first guy to ever do that! What Carl suggested is a good place to start. Do what you have to and find it. Good luck!
BTW..The "Dumbest Move" club has many members, and you are in good company!
Mark Ohlau
RV-6 N506MM VAF #1410
2017 Donation Made
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Old 12-30-2015, 02:24 PM
2johns 2johns is offline
Join Date: Apr 2008
Location: Great Falls, Montana
Posts: 84

You are not yet in the "dumbest mistake club" To do that you must start your engine without finding the nut.
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Old 12-30-2015, 02:24 PM
HIIFLY's Avatar
HIIFLY HIIFLY is offline
Join Date: Sep 2007
Location: New Brighton, Pa. 15066
Posts: 287

FYI , the back of the rear case is open to the oil sump, and you will have to get past the gears on the rear of the engine if the nut made its way all the way down to the sump . But It could be stuck on or between the gears , So DO NOT turn the engine ! You may have to remove the back case and or the sump or both ??
Next time just stuff rags in the hole or tape it off while working the back of the engine . Been there Done that .
14 planes owned ,11 bought ,3 built .
RV-8 N808H ,Sold
RV-6 Sold 😔
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Old 12-30-2015, 02:43 PM
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Mel Mel is offline
Join Date: Mar 2005
Location: Dallas area
Posts: 11,214

First I would try using a borescope and see if you can find where it is.
If you know where it is, it will be easier to retrieve with a magnet.
If it did go into the sump you might have luck removing the oil suction screen and going in through there. Or maybe through the oil filler tube.

If all else fails try turning the airplane upside down and shaking it.

Oh wait; the RV-9A is not aerobatic. Never mind that last suggestion.
Mel Asberry, DAR since the last century. Over 1,000 certifications accomplished. Discount for Veterans, Law Enforcement, Fire Fighters.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)

Last edited by Mel : 12-30-2015 at 02:46 PM.
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Old 12-30-2015, 04:03 PM
Ed_Wischmeyer's Avatar
Ed_Wischmeyer Ed_Wischmeyer is offline
Join Date: May 2005
Location: Savannah, GA
Posts: 1,573

I think it's pretty audacious to consider that the dumbest mistake ever, and I can see this discussion going off into the weed pretty quickly. For example, there was the time that I...
RV-9A at KSAV (Savannah, GA; dual G3X Touch with autopilot, GTN650, GTX330ES, GDL52 ADSB-In)
Previously RV-4, RV-8, RV-8A, AirCam, Cessna 175
ATP CFII PhD, so I have no excuses when I screw up
Vaccines kept me out of the hospital but COVID still cost me a month of living, all told...
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Old 12-30-2015, 04:55 PM
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Jesse Jesse is offline
Join Date: May 2005
Location: X35 - Ocala, FL
Posts: 3,711

If a search with a magnet doesn't prove successful, drain the oil (not using a quick drain) and see if it comes out with the oil. If you catch the oil in a clean container then you could reuse it if it's new. You could also pull the rear screen plug and shove a magnet in ere to try to fish it out. If it doesn't come out any of these ways, then you could possibly use a stronger magnet from the outside of the sump and drag it to one of the holes already mentioned.

If it is the rut Mag and you don't have a hydraulic unit, you may be able to take the cover plate off that port and get better access.
Jesse Saint
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Old 12-30-2015, 04:58 PM
cajunwings cajunwings is offline
Join Date: Jun 2007
Location: new iberia la
Posts: 867
Default Lost Nut

Mike: I'm with Ed, don't think you can lay claim to dumbest mistake. I fully agree with DO NOT TURN THE PROP. Looking at photos I took during my engine build I would say it should be in the sump. The easiest place to start is down thru the dipstick tube with a magnet on a flexible neck. Go fishing and try to get to all points in the rear half of the sump. You may have this resolved in 5 minutes.

Don Broussard

RV 9 rebuild in progress
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Old 12-30-2015, 06:48 PM
Martin Sutter Martin Sutter is offline
Super Moderator
Join Date: Jan 2005
Posts: 268

Been there, done that! Happened to me many years ago. I was able to fish the nut out thru the rear sump drain after a few minutes of fishing with a device made from a 10ga solid copper wire with a small strong magnet attached to the end. I bent a half loop in the end of the wire with the same diameter as the magnet and used heat shrink to attach the magnet to the wire. I tried a magnet on a springy flex rod but that did not work because you must go up thru the drain and then down to the floor of the sump. After a few tries I was able to bend the copper wire just right to do that. Good luck!

Martin Sutter
building and flying RV's since 1988
EAA Technical Councelor
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