Hi!

Thanks for all replies.

When you say "overhaul", what does this imply?
Is it an engine change, or just a major visit to the shop going through
everything and changing whatever is needed?

Here, a major overhaul means dismounting the engine, sending it to Lycoming
(or continental) and putting a factory overhauled one back in.
This costs approx $20.000 + shipping (over $1200) + additional parts and of
course labour...

However, if "overhaul" means replacing a cylinder or two, inspecting
cranckshaft, changing magnetos adn plugs, and generally going through
everything, this is a complete different matter, and probably much cheaper,
no?

Thanks,

Frode
"G.R. Patterson III" skrev i melding
...


Frode Berg wrote:

He said this is the way it works in the US.

That's the way it works for many aircraft. There are certain types of
businesses
that have to have the engine overhauled at the service time specified by
the
engine manufacturer, but others don't have to do so. Note that the engine
is
usually overhauled. Few people replace an engine with a brand new one, and
the
regulations don't require replacement with new. Many individuals who own
aircraft
will continue to operate the plane until the engine starts to give signs
of
wearing out. These signs would be things like using too much oil, oil
fouling
the plugs, poor compression, and so on.

Also, what are the safety issues?

Older engines are more prone to failure. I've read, for example, that this
is a
big problem with the Douglas DC-3 as new original engines can't be bought
anymore.

Does a new engine actually perform better?

An overhauled engine should perform as well as a new one, and some shops
produce
engines which they claim are better than new.

He told me about a C177 that came to his shop from the US for overhaul
(change of a couple of sylinders +) and it had over 9000 hours on it's
engine...

It's possible for an engine to last that long if it were overhauled
several times
during that 9,000 hours. It's highly unlikely that one would live that
long without
an overhaul.

George Patterson
Great discoveries are not announced with "Eureka!". What's usually
said is
"Hummmmm... That's interesting...."