Does an overhaul un-lemon an engine?

xyzzy wrote:
If an engine has been overhauled 3 times, never making TBO either time
(not even making it to 1/2 of TBO 2 of the times), should I be concerned
that it might be a lemon, or if the current overhaul was done right and
the engine has been treated right since then, should I not worry about
how it did before this overhaul?


The overhual isn't going to be the only factor in determining whether it
makes it to the next one. How it's used and maintained is. If you fly
infrequently and hardly do maintenance outside of annual time, there's
no way it's EVER going to make it to TBO. Our aircraft that get beat
to death by students regularly exceed TBO by hundreds of hours.

What's the engine?

Mike Granby wrote:

What's the engine?


Cont O-300

Hmmmmm - probably no full flow oil filter?

What kind of problems caused the majors? cylinders scored? where?

Check the integrity and fit of the cooling baffles and general engine
cleanliness. Those tin shingles aren't just for looks.

It could also be how it was treated.

"xyzzy" wrote in message
...
If an engine has been overhauled 3 times, never making TBO either time
(not even making it to 1/2 of TBO 2 of the times), should I be concerned
that it might be a lemon, or if the current overhaul was done right and
the engine has been treated right since then, should I not worry about how
it did before this overhaul?



With 1000 hours in a flight school and needing overhaul, I would be
concerned. 500 hours per year in a flight school is usually a good thing for
the engine (though perhaps not the hull). Students often run full rich too
much.

The second overhaul doesn't mean much since that much time is at least as
damaging as the normal tbo hours.

I would bet it will not make it to overhaul ever, but that is just my
intuition. Unless you know the guy who last overhauled it, and his
reputation, I would bet against it for sure.