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Well, the failure is interesting, but only one thing to do - remove and repair.
The area seems much too well defined to be carbon polishing. And too high to be anything but a piston ring. No material transfer for a FOD compression of the top land, and no associated head damage. A guess, is it is likely a broken ring that has finally banged around and turned to scrape the wall. in a most unpleasant way. |
Is that a pool of oil?
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Oil
Sure looks like oil to me. I had broken rings in a Pitts and it looked exactly like that. It was burning a quart of oil in less than 2 hours.
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Issue
Scoring looks to be to high up the cylinder wall to be a wrist pin cap. My guess would be a ring or possibly a FOD. :(
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So where is all the aluminum coming from if it is not the wrist pin (which I agree it is not)? The rings are steel as is the cylinder liner. Is the piston coming apart. I guess I could wait for Kevin to pull the jug, but I am just curious and impatient.
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Larry |
KennyM
This is my first post. I own a Cessna 152 & have dreams of building an
RV 8. The post about Lycoming making metal got my attention. I bought a zero time LC235 got 700 hrs. before it starting making metal. Was Piston wrist caps ( bad design in my opinion) Can be checked without Removing cylinder pass rings. Good luck |
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Pretty sure we will see a large distorted ring groove worn in the piston. So - it makes ferrous metal from the wall and aluminum from the piston. It may be causing some skirt erosion as well from debris trapped in between. |
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