Guess as to Origin of Metal Found in Oil Screen

Discussion in 'Maintenance Bay' started by iflyvfr, Jul 26, 2020.

  1. iflyvfr

    iflyvfr Pattern Altitude

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    My mechanic showed me this last weekend when I stopped by to say hello. C-172 with an O300 motor; non-ferrous part found in the oil screen, spin on filter was clean. I'd say just over an inch wide. Appears failure was at the oil flow holes - at least that's what they appear to be to my untrained eye. Not my engine, just curious what this might be since i have same motor at TBO. I'd consider this pretty serious were this found in my oil screen.

    IMG_3313.jpg IMG_3312.jpg IMG_3311.jpg IMG_3310.jpg IMG_3309.jpg IMG_3308.jpg

    At any rate, it's parked in the back of the hangar, where birds that aren't flying anytime soon go.
     
  2. bflynn

    bflynn Final Approach

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    Prediction - it is in the expensive part of the engine.
     
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  3. Bob Noel

    Bob Noel Touchdown! Greaser!

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    flag on the play... there are no inexpensive parts of an aircraft engine
     
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  4. nrpetersen

    nrpetersen Line Up and Wait

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    O-300D engine I'll bet. Looks like part of the worm gear wheel for the starter drive.
     
  5. Pilot Steve

    Pilot Steve Pre-takeoff checklist

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    All I see is $$$$. Since you have the piece, a good place to start is the Illustrated parts Catalog (IPC) and look at the internal engine bits to compare the piece.

    So sorry for your loss.
     
  6. Doug Reid

    Doug Reid Line Up and Wait

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    Piston skirt ?
     
  7. Tarheelpilot

    Tarheelpilot Final Approach PoA Supporter

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    Someone will be along shortly and say it’s fine to fly for ten hours and check for metal in the screen/filter.
     
  8. Pilot Steve

    Pilot Steve Pre-takeoff checklist

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    LOL. I heard that once. So funny.
     
  9. NordicDave

    NordicDave Pattern Altitude

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    Don't think so, since it's anodized. I betting it's part of the case.
     
  10. Tarheelpilot

    Tarheelpilot Final Approach PoA Supporter

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    There will be a a Mike Busch (Bush?) reference shortly as well.
     
  11. Daleandee

    Daleandee Pattern Altitude

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    That looks like a $20K part to me ...
     
  12. Tom-D

    Tom-D Taxi to Parking

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    My guess too, can you make the diameter of the piece?
     
  13. Tom-D

    Tom-D Taxi to Parking

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    FTFY
     
  14. Tom-D

    Tom-D Taxi to Parking

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    To get in the screen it needs to get from the sump to the screen,, accessory case wouldn't pass that large of a piece.
     
  15. Tom-D

    Tom-D Taxi to Parking

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    looks like oil varnish to me.
     
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  16. Tom-D

    Tom-D Taxi to Parking

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    Flush it out, run the engine it won't be long before you know. :(
     
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  17. mondtster

    mondtster En-Route

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    That’s what I think too.
     
  18. NordicDave

    NordicDave Pattern Altitude

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    Thinking about Tom's comment about the gold color being varnish.

    0-300 piston

    [​IMG]

    Looks like a piece off the piston oil ring groove above the piston pin boss.
     
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  19. sourdough44

    sourdough44 Pattern Altitude

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    That is a big chunk.
     
  20. Chip Sylverne

    Chip Sylverne Final Approach

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    Quit with the negative waves, man.
    If it's piston or ring, I'd think a borescope of the cyls would tell the tale.
     
  21. Capt. Geoffrey Thorpe

    Capt. Geoffrey Thorpe Touchdown! Greaser! PoA Supporter

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    I recall an industrial engine for an air compressor that I repaired. Missing badly, quick check found absolutely no compression in one cylinder. OK, that should be easy. Pull the head. Valves and gear look good. Piston looks good. Turn the crank, three pistons go up and down, one is stationary. OK, no sweat, broken rod. Drop the oil pan, no broken rod, no chunks of metal. WTF? Turn the crank, looks good. Things go roundy roundy and upsie downie. This does not seem not possible. All I can do is keep digging. Unbolt the rod ends, drop the crank out of the way, grab the rod for the bad cylinder, pull it out and I get the rod and all of the piston below one of the ring grooves. The piston crown is still in the block.
     
  22. flyingbrit

    flyingbrit Pre-takeoff checklist

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    Doesn't look like a normal O-300 piston to me. Mine have three compression rings and one oil control ring which is located near the bottom of the skirt. Pictures in OH manual look similar.
     
  23. MooneyDriver78

    MooneyDriver78 En-Route

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    For future reference, adding a coin or dollar bill for scale in the pictures would be helpful.
     
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  24. 455 Bravo Uniform

    455 Bravo Uniform En-Route

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    455 Bravo Uniform
    Measure the outside curve and calculate a diameter and see if it matches the bore size of that engine.
     
  25. Dan Thomas

    Dan Thomas Final Approach

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    A piece that big didn't come from inside the engine. It would never make it through the suction screen or oil pump. It looks more like some part of the mounting for a spin-on filter.
     
  26. Omalley1537

    Omalley1537 Cleared for Takeoff

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    I understood the OP to mean it was in the suction screen, thus before the oil pump. Maybe I’m assuming facts not in evidence.
     
  27. aftCG

    aftCG Line Up and Wait

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    Preferably a $20,000 bill

    When I do oil changes I drop my filter off with my IA and ask him to "check it for precious metals. One of us might be rich"
     
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  28. Dan Thomas

    Dan Thomas Final Approach

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    If it was found in the suction screen, then yes, it might be a chunk off the bottom of a piston. A picture showing it turned over would be nice; it would show whether or not it had a ring land with the ring's marks on it
     
  29. steingar

    steingar Taxi to Parking

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    Since when is there a big group hangar at TZR?
     
  30. iflyvfr

    iflyvfr Pattern Altitude

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    That was my thought when I saw it too. Yes it is from an O-300D engine and FORTUNATELY not mine as I agree it looks Ex$pen$ive.
     
  31. iflyvfr

    iflyvfr Pattern Altitude

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    Not TZR - I could only wish my mechanic was on the field. The hangars are full, I wish they'd get one that could afford to stay.
     
  32. iflyvfr

    iflyvfr Pattern Altitude

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    Yeah sorry about that, I tried to take pics from all different angles too and something for reference would have been ideal.
     
  33. iflyvfr

    iflyvfr Pattern Altitude

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    Yes, that's what I was told when I asked, it came from the finger screen. I was told the oil filter checked out OK. Oh, and I said it was from an O-300D but in fact I'm not sure which version of the O-300 that motor is.
     
  34. Dan Thomas

    Dan Thomas Final Approach

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    The busted version.
     
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  35. Dan Thomas

    Dan Thomas Final Approach

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    IIRC the O-200 and O-300 used the same pistons, and they looked like this:

    [​IMG]
     
  36. iflyvfr

    iflyvfr Pattern Altitude

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    Just so happens I have a complete Superior assembly waiting to go, here's the NIB piston:
     

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  37. weilke

    weilke Touchdown! Greaser! PoA Supporter

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    This is POA. Did we get a reply yet where someone fixes that on his workbench for $1200 in parts and rants about the ripoff that is the engine repair business ?
     
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  38. Daleandee

    Daleandee Pattern Altitude

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    Man please ... we had a fella at out airport that would have just tack welded it back in place, smoothed it out with a side grinder and run the engine hard until the noise went away from all the parts rubbing together. Seriously, he had an experimental airplane that he experimented with a lot but was always asking other people to fly it. That fella is no longer with us and actually passed from old age.

    But we have a replacement now. Guy asked if I wanted to fly his plane and I said no. He asked why. I said, "cause I've seen you work on it."
     
  39. kyleb

    kyleb Final Approach PoA Supporter

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    I ended up doing an acro flight in a Stearman like that once. I didn't find out until after we landed who the previous owner/restorer was. Yikes.
     
  40. wsuffa

    wsuffa Touchdown! Greaser!

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    No need for $1200 in parts. A little Gorilla Glue, some JB Weld and a touch of Bondo will have it good as new.

    ;)
     
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