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  #11  
Old 02-16-2015, 01:13 AM
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swisseagle swisseagle is offline
 
Join Date: Feb 2005
Location: 20km outside of Zurich, Switzerland
Posts: 468
Default 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.
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  #12  
Old 02-16-2015, 02:28 AM
PCHunt PCHunt is offline
 
Join Date: Feb 2007
Location: San Diego, CA
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Default 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.
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Last edited by PCHunt : 02-16-2015 at 02:49 AM.
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  #13  
Old 02-16-2015, 06:21 AM
mahlon_r mahlon_r is offline
 
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Default

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.
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Mahlon
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  #14  
Old 02-16-2015, 06:28 AM
Apexeon Apexeon is offline
 
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Location: Tallahassee, FL
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Default

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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  #15  
Old 02-16-2015, 07:37 AM
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LifeofReiley LifeofReiley is offline
 
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Default

Quote:
Originally Posted by mahlon_r View Post
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
Dominik
Here is the answer you've been waiting for.
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  #16  
Old 02-16-2015, 08:18 AM
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swisseagle swisseagle is offline
 
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Default 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.
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Last edited by swisseagle : 02-16-2015 at 08:19 AM. Reason: spelling
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  #17  
Old 02-16-2015, 08:30 AM
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Kahuna Kahuna is offline
 
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Default

Quote:
Originally Posted by Apexeon View Post
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?
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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  #18  
Old 02-16-2015, 09:19 AM
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jjconstant jjconstant is offline
 
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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.
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  #19  
Old 02-16-2015, 09:19 AM
Apexeon Apexeon is offline
 
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Quote:
Originally Posted by Kahuna View Post
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.
Thanks for the correction
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  #20  
Old 02-16-2015, 10:32 AM
jrs14855 jrs14855 is offline
 
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Default Oil Pickup

Quote:
Originally Posted by Kahuna View Post
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.
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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