I've put over 1,000 of the 1,100 hours on this new O-360-C4f. Changed
the oil religiously. I didn't baby the engine but didn't abuse it
either. Always hangered etc.

My last oil analysis showed a doubling of iron 47.9ppm to 101.0ppm with
36 hours on the oil. Everything else normal. We did the filter and we
found very fine iron filings or dust with a magnet. How much - hard to
tell. No chunks though.

We're thinking cam and lifter.

My mechanic is playing it safe - called Signature and Mattituch who
recommended no more flying, split the case, and fix or overhaul.

I want some second opinions. I could fly 10 more hours and take another
look. We could pull a cylinder and check the cam I'm told.

I've read about Second OilPINION and Howard Felton - a knowledgeable
analysis of the metal seems like money well spent. Is he still in
business? Anyone know anyone else who can do this?

Any other factors? My exhaust manifold/heat exchanger broke and I flew
for 10 to 36 hours with it broken. Parts 'banging' around under the
cowling etc. Discovered it during oil change. I did let it sit without
running for 60+ days - a first for this aircraft.

Thoughts?

Maulesitter.