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02-16-2015, 01:13 AM
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Join Date: Feb 2005
Location: 20km outside of Zurich, Switzerland
Posts: 468
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Pin exactly measured
Thank you for all your inputs.
The diam. I could measure it with a caliper, it is 0.088" diam.
The end of the part straight and has straight marks inside and outside. I would think it comes from a flat of a nut or so.
I will go through all your answers and then decide what to do, together with a A&P.
__________________
Dominik
RV-7A, TMX-IO-320, FM-150, Sensenich FP
Flying since 28. April 2016
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02-16-2015, 02:28 AM
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Join Date: Feb 2007
Location: San Diego, CA
Posts: 1,670
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Oil Anlaysis
Have you been doing routine oil analysis?
Oil analysis by itself is not the entire answer, yet it is an important piece of the puzzle.
If you have a history of oil analysis on this engine, then it can be helpful.
A large piece of metal in the screen or filter can be a non-event, if that piece hasn't caused damage in the engine elsewhere.
On the other hand, it might have bounced around in the engine and caused some damage. To me, the cotter pin end, or whatever it is, appears relatively undamaged. If it had traveled through the engine and done damage, it would seem that it would also have been damaged.
Oil analysis can help determine which might have happened.
........One more part of the puzzle!.......
As always, one person's opinion, and YMMV. Worth the $2 you paid for it. Etc.
__________________
Pete Hunt, [San Diego] VAF #1069
RV-6, RV-6A, T-6G
ATP, CFII, A&P
2020 Donation+, Gladly Sent
Last edited by PCHunt : 02-16-2015 at 02:49 AM.
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02-16-2015, 06:21 AM
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Join Date: Jan 2005
Posts: 1,025
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I would look to the mag drives. That is the only place I can think of that uses a cotter pin, that is inside the engine. The bolts on the bottom of the case use safety wire and so does the nut behind the cam gear.
Good Luck,
Mahlon
__________________
"The opinions and information provided in this and all of my posts are hopefully helpful to you. Please use the information provided responsibly and at your own risk."
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02-16-2015, 06:28 AM
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Join Date: Apr 2014
Location: Tallahassee, FL
Posts: 38
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I think I recall that the oil pick-up in the sump has a screen over it. Unless the cotter pin was holding the screen on the pick-up and has come loose, I don't know how it would have made it's way through the system. Am I missing something?
__________________
Don Thompson
Tallahassee, FL
Hangar D-3 Quincy, FL (2J9)
N726DT RV 6 Flying
N4493J '67 Cherokee 140 sold
N2120J '78 Warrior II owned twice, sold twice
2017 Dues Paid
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02-16-2015, 07:37 AM
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Join Date: Jan 2005
Location: Round Rock, TX
Posts: 3,778
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Quote:
Originally Posted by mahlon_r
I would look to the mag drives. That is the only place I can think of that uses a cotter pin, that is inside the engine. The bolts on the bottom of the case use safety wire and so does the nut behind the cam gear.
Good Luck,
Mahlon
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Dominik
Here is the answer you've been waiting for. 
__________________
Reiley
Retired N622DR - Serial #V7A1467
VAF# 671
Repeat Offender / Race 007
Friend of the RV-1
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02-16-2015, 08:18 AM
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Join Date: Feb 2005
Location: 20km outside of Zurich, Switzerland
Posts: 468
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YES!
Yes, I hopped that Mahlon join in, I asked him with a private mail
Anyway a big thank you to all of you for your quick answers! It is so helpful to have contact to so many people which can help!
I will come back with the analysis after the magnetos were removed.
Oil-Analysis and the opening of the filter does not show anything bad! It was just this small part.
__________________
Dominik
RV-7A, TMX-IO-320, FM-150, Sensenich FP
Flying since 28. April 2016
Last edited by swisseagle : 02-16-2015 at 08:19 AM.
Reason: spelling
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02-16-2015, 08:30 AM
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Join Date: Dec 2004
Location: Gold Hill, NC25
Posts: 2,400
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Quote:
Originally Posted by Apexeon
I think I recall that the oil pick-up in the sump has a screen over it. Unless the cotter pin was holding the screen on the pick-up and has come loose, I don't know how it would have made it's way through the system. Am I missing something?
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You are not correct. The oil free flows through the sump through a passage into the sump screen area, provided of course that you do not have the inverted plug installed. Remember the whole purpose of the sump screen that you remove through the rear sump plug, is to catch stuff just like this. You would NOT want a screen in the sump tank over the orifice to the rear sump screen as you would have to remove the sump every time you wanted to check for any debris.
__________________
Kahuna
6A, S8 ,
Gold Hill, NC25
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02-16-2015, 09:19 AM
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Join Date: Dec 2006
Location: Oakland CA
Posts: 771
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I also found a cotter pin tail in my sump screen. I removed the left mag and it had the tail that normally wraps over the end of the bolt broken off. The tail that went through the castelations was still there and the beginning of the bend was still pesent on the broken tail, so the cotter pin wasn't going anywhere. I removed and replaced it after checking for what the proper size was. The specified size was a different size than the one that broke.
__________________
All Best
Jeremy Constant
RV7A "Stella Luna" ECI IO-360 WW200RV Pmags 360hrs
VAF 2019 paid plus some for those who can't
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02-16-2015, 09:19 AM
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Join Date: Apr 2014
Location: Tallahassee, FL
Posts: 38
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Quote:
Originally Posted by Kahuna
You are not correct. The oil free flows through the sump through a passage into the sump screen area, provided of course that you do not have the inverted plug installed. Remember the whole purpose of the sump screen that you remove through the rear sump plug, is to catch stuff just like this. You would NOT want a screen in the sump tank over the orifice to the rear sump screen as you would have to remove the sump every time you wanted to check for any debris.
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Thanks for the correction
__________________
Don Thompson
Tallahassee, FL
Hangar D-3 Quincy, FL (2J9)
N726DT RV 6 Flying
N4493J '67 Cherokee 140 sold
N2120J '78 Warrior II owned twice, sold twice
2017 Dues Paid
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02-16-2015, 10:32 AM
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Join Date: Apr 2008
Location: Lake Havasu City AZ
Posts: 2,393
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Oil Pickup
Quote:
Originally Posted by Kahuna
You are not correct. The oil free flows through the sump through a passage into the sump screen area, provided of course that you do not have the inverted plug installed. Remember the whole purpose of the sump screen that you remove through the rear sump plug, is to catch stuff just like this. You would NOT want a screen in the sump tank over the orifice to the rear sump screen as you would have to remove the sump every time you wanted to check for any debris.
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Many of the earlier Lycoming's had a oil pickup that was a tube assembly that bolted to the accessory case. IIRC the screen assembly was installed vertically in the bottom of the sump near the center. Large hex retainer in the bottom of the sump, much larger than the current horizontal oil screens.
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