Does an overhaul un-lemon an engine?

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.

On Mon, 09 May 2005 15:38:19 -0400, xyzzy wrote:

No Spam wrote:

On 5/9/05 11:56, "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


In this case, it was first owned by a flight school that put 1000 hours
on it in 2 years and then overhauled it. Then it was sold to someone
who owned it for 40 years, went long stretches without flying it, and
went an average of 400 hours and 15 years between overhauls (including a
top). It was major-overhauled in 2003, about 40 hours put on, and then
sold to the current owners in 2004 who put about 50 on it in the last
year. I'm considering buying in with them. Sounds like the consensus
is that it's how good the last overhaul is, and how well it's been
treated since, that matters, and what it did before the last overhaul is
less important.

TBO is measured in both hours of operation -or- calendar time. 12
years is the recommendation for many engines, so if that is the case
for this engine, the engine made it to TBO each time.

-Nathan

That's a really good question. Do you have "The Complete Overhaul"
by Kas Thomas? This is a really good book on the overhaul and industry.

Isn't it called "The Major Overhaul" by Kas Thomas or is there another book
call "The Complete Overhaul?"

Kobra

On 5/15/2005 8:29 AM, Kobra wrote:

That's a really good question. Do you have "The Complete Overhaul"
by Kas Thomas? This is a really good book on the overhaul and industry.

Isn't it called "The Major Overhaul" by Kas Thomas or is there another book
call "The Complete Overhaul?"

Kobra



You are correct. "The Major Overhaul". I didn't have the book handy
when I posted. Sorry about that...


--
Mark Hansen, PP-ASEL, Instrument Student
Sacramento, CA